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Aspergillus awamori MK788209 cellulase: production, statistical optimization, pea peels saccharification and textile applications

Microbial Cell Factories volume 23, Article number: 11 (2024) Cite this article

Abstract

Background

The demand for low-cost cellulolytic enzyme synthesis is rising in the enzyme market. This work aims to produce cellulase by utilizing various agricultural wastes and investigating the use of enzyme in saccharification and textile industries.

Results

Solid state fermentation (SSF) was applied to produce industrial enzymes, particularly cellulase, through utilizing Molokhia (Corchorus olitorius) stems by Aspergillus awamori MK788209 isolate. Two stages of statistical factorial designs Plackett-Burman (PB) and Central Composite Design (CCD) were applied to enhance the A. awamori MK788209 cellulase production from Molokhia stems (MS). The fold increase of enzyme production by PB followed by CCD was 2.51 and 4.86, respectively. Additionally, the A. awamori MK788209 culture filtrate was highly effective in saccharifying various agricultural wastes, particularly pea peels (PP) (yielding 98.33 mg reducing sugar/ml), due to its richness in cellulase, laccase, xylanase, pectinase, and amylase. By optimizing the three main variables; pea peel weight, culture filtrate volume added, and saccharification time by CCD, the sugar recovery from PP was enhanced, leading to a 3.44-fold increase in reducing sugar recovery (338 mg reducing sugar /ml). Furthermore, the A. awamori MK788209 culture filtrate showed high efficacy in textile applications, enhancing the roughness, weight loss, white index, and printing capability of treated cotton fabrics.

Conclusions

A. Awamori MK788209 produced cellulase which was effective in PP saccharification. The enzyme was also capable of enhancing cotton fabric properties.

Background

The production of valuable products using inexpensive, environmentally friendly resources is today’s main target. Because of this, there is a lot of attention paid to the use of lignocellulosic agricultural wastes, which are primarily responsible for environmental contamination because of their accumulation and high disposal costs. Lignocelluloses are mainly composed of cellulose (35–50%) (homopolysaccharide of β-1, 4-glucan), hemicelluloses (25–30%) (heteropolysaccharides of xylans, mannans) and lignin (25–30%) (complex polyphenolic structure). Currently, pectinase, xylanase, and cellulases account for over 20% of the global enzyme market. High production cost and low production yields caused the bottleneck for industrial enzymes applications [1, 2].

Thus, these lignocellulolytic wastes can be used as fermentation substrates for microbes [3, 4] for the production of lignocellulolytic enzymes that are utilized in, textile industry [5, 6], paper, fruit and vegetable processing industries [7], and agricultural inputs [8]. Alternatively, these wastes can be transformed into valuable products by employing enzymes like cellulases, hemicellulases, glucanases, polysaccharide lyases, glycosidase hydrolases, and carbohydrate esterases [9]. Fuel and chemicals are two of these valuable products [10]. Some authors [11, 12] have described the biological conversion of agricultural wastes into organic materials, the use of microorganisms to bioremediate environmental pollutants and interact with the root rhizosphere to promote plant growth and soil structure, resulting in high-value and low-cost bioorganic farm inputs [13,14,15].

Nevertheless, three cellulolytic enzymes, endoglucanases (EC 3.2.1.4), exoglucanases (cellobiohydrolases; EC 3.2.1.91), and β-glucosidases (EC 3.2.1.21), must work in harmony to bioconvert cellulose to fermentable sugars by releasing glucose from cellobiose [16,17,18,19]. Numerous microorganisms, such as bacteria, actinomycetes, and fungi, produce cellulases; however, because fungal cellulases are excreted extracellularly, they are of particular interest [20].

Converting lignocellulolytic wastes into ethanol primarily involves two steps: first, the cellulose in the lignocellulosic biomass is hydrolyzed to form reducing sugars, and then the sugars are fermented to produce ethanol. Since enzyme hydrolysis is often carried out in mild conditions (pH 4.8 and 45–50 °C) and does not have a corrosion problem, it is less expensive than acid or alkaline hydrolysis [21].

Moreover, lignocellulolytic enzymes are implicated in textile industry. For example, desizing (removing starch size with amylases); bioscouring (using pectinase, lipase, and cellulase solutions to dissolve waxes, proteins, pectins, and natural fats from the surface of cotton fibers); bio-finishing (using cellulases to remove fiber fuzz and pills from the substrate surface to improve the appearance of cotton fabrics and garments); biostoning (using cellulases to stonewash denim fabrics to create the trendy aged appearance); laundering garments or removing different types of stain with a mixture of enzymes [22].

The goal of this study was to use cheap, widely accessible lignocellulosic waste for solid state fermentation by a fungal isolate, which would produce cellulase. Improvement of cellulase yield through two stages of statistical design (Placket-Burman design and Central composite design). Saccharification of eight agricultural wastes using crude lignocellulolytic enzymes. In order to maximize the yield of reducing sugars, it was also investigated how different factors, including pea peel weight, enzyme load, and saccharification period, affected the enzymatic hydrolysis of pea peel into reducing sugar. Additionally, the usefulness of fungal cellulase at various stages of the textile industry was studied.

Materials and methods

Raw material

Agro-residues (corn cobs: CC, lemon peels: LP, potato shells: PS, okra suppression: OS, molokhia stem: MS, rice straw: RS, onion peel: OP and pea peels: PP) were collected from local market in Egypt. They were washed and dried in an oven (70 °C for 24 h). To be used as the substrate in SSF, the dried materials were ground using an electric grinder, separated using a 1 cm sieve, and then sealed in airtight containers. Sigma-Aldrich provided the soluble starch, xylan, pectin, ABTS, and carboxymethyl cellulose (CMC).

Strain isolation and identification

Pea peels that were purchased locally were used to isolate Aspergillus awamori. Two grams of pea peels were soaked for an hour in a 250 Erlenmeyer flask containing 50 ml of sterile distilled water, then, 200 µl was spread on potato dextrose agar plates and plates were incubated at 32 °C for one to five days. To verify the purity of the culture, individual colonies were selected, streaked on potato dextrose agar plates, and then re-incubated. For additional testing, the pure culture was transferred to potato dextrose agar slants. Aspergillus awamori 18S rRNA sequence was used for molecular identification by using GeneJET™ PCR Purification Kit (Thermo#K0701) in Sigma Company of Scientific Services, Egypt (www.sigma-co-eg.com).

Production of cellulase enzyme under solid-state fermentation (SSF)

In the screening step, Seven different agricultural wastes (corn cobs: CC, lemon peels: LP, potato shells: PS, okra suppression: OS, molokhia stem: MS, rice straw: RS, onion peel: OP and pea peels: PP) were used as substrates for cellulase production. Two grams of the dried solid substrates were added to 250 ml Erlenmeyer flasks for solid state fermentation. Moisture was adjusted by addition of 10 ml of distilled water to each flask. Each flask was covered with hydrophobic cotton and autoclaved at 121 °C for 20 min. Following cooling, 1.0 ml of an inoculum containing 5 × 107 spores.ml− 1 of a 5-day-old culture was added (measured using spectrophotometer at 625 nm). The inoculum was made by harvesting the fungus’s slant in 20 ml of sterile distilled water. The inoculated flasks were incubated under static conditions for 7 days at 32 ± 2 °C. Every experiment was conducted in duplicate and mean ± SD, which was computed using Microsoft Excel, is the reported average value.

Extraction of cellulase enzyme

Enzyme extraction was done by adding fifty ml of distilled water and left in a rotary shaker 150 rpm for 60 min. Then the mixture was filtered through a cloth and the culture filtrate centrifuged for 15 min at 5,000 rpm and 4 °C. The supernatant was used as the crude cellulase enzyme extract.

Enzymes assays

Lignocellulolytic enzymes activities included cellulase, xylanase, pectinase and laccase were determined as mentioned by Mostafa et al. [5] and amylase was determined as mentioned by Ahmed et al. [23] as follows:

Cellulase assay

In 0.05 M acetate buffer (pH 5.0), 0.5 ml of 1% carboxymethyl cellulose (CMC) was mixed with half a milliliter of the crude enzyme preparation. After that, the reaction mixture was incubated for 30 min at 50 °C. The Somogyi method [24] was used to determine the released reducing sugars. The amount of enzyme that, under assay conditions, librated one µmol of glucose per minute was defined as one unit of cellulase (IU).

Xylanase assay

Half ml of supernatant solution was added to 0.5 ml of 1% xylan in 0.05 M acetate buffer pH 5.0. Then the reaction mixture was incubated at 50 °C for 30 min. The amount of reducing sugar liberated was quantified by the method of Somogyi method [24] using xylose as standard. One unit of xylanase is defined as the amount of enzyme that liberates 1 µmol of xylose equivalents per minute under assay conditions.

Pectinase assay

Pectinase activity was evaluated by mixing 0.2 ml enzyme solution and 0.8 ml of 0.5% citrus pectin in 0.05 M acetate buffer (pH 5.0). Samples were incubated for 10 min at 50 °C and the reducing sugars were determined as galacturonic acid by Somogyi method [24]. One unit of enzyme activity was defined as the amount of enzyme releasing1 µmole of galacturonic acid under assay conditions.

Amylase assay

Half ml of 1% soluble starch and 0.5 ml of supernatant solution were combined in 0.05 M acetate buffer (pH 5.0) and incubated for 20 min at 40 °C. The Somogyi [24] method was used to determine the released reducing sugars. Under assay conditions, one unit of enzyme activity (IU) was defined as the amount of enzyme that released one µmol of reducing sugar per minute.

Laccase assay

The reaction mixture contained 600 µL sodium acetate buffer (0.1 M, pH 5.0 at 27 °C), 300 µL ABTS (5 mM), 300 µL culture filtrate and 1400 µL distilled water. The mixture was then incubated for 2 min. at 30 °C. The absorbance was measured immediately at one-minute intervals at 420 nm. One unit of laccase activity was defined as activity of an enzyme that catalyzes the conversion of 1 µmol of ABTS per minute.

Optimization of A. awamori MK788209 cellulase production by Plackett-Burman design

In this design we investigated the qualitative effect of eleven factors on Aspergillus awamori MK788209 cellulase production including A: molokhia stalks (g.flask− 1), B: incubation time (days), C: glucose (g.l− 1), D: lactose (g.l− 1), E: baker’s yeast (g.l− 1), F: peptone (g.l− 1), G: (NH4)2SO4 (g.l− 1), H: CuSO4 (g.l− 1), J: FeSO4(g.l− 1), K: CaCl (g.l− 1), L: KCl (g.l− 1).

Each of these factors was studied with low level (− 1) and high level (+ 1). Total number of experiments was 12 trials based on the rule n + 1, where n: represents the number of factors under investigation (Table 1).

Table 1 Plackett-Burman design for Aspergillus awamori MK788209 cellulase production
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The statistical significance was determined by F-value, and the proportion of variance explained by the model obtained was given by the multiple coefficient of determination, R2 (Table 2). Experimental responses were analyzed by first order model by the following equation: cellulase activity (U/ml) = β°+ΣβiXi.

Table 2 Analysis of variance (ANOVA) for Plackett-Burman design for Aspergillus awamori MK788209 cellulase production
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β° is the model intercept and βi is the linear coefficient, and Xi is the level of the independent variable. The experimental design and analysis were done by using (Design Expert) software (version 7.0).

Optimization of A. awamori MK788209 cellulase production by Central Composite Design (CCD)

The most effective parameters from the Plackett-Burman design, namely (A) MS weight (g.flask− 1) and (B) incubation time (days), are studied quantitatively in this design. As indicated in Table 3, which was used in CCD, variables were examined at five levels: -1.414, -1, 0, + 1, and + 1.414. This resulted in a total of 13 trials as indicated. Analysis of variance (ANOVA) was used to conduct the model’s statistical analysis (Table 4).

Table 3 Central Composite Design for Aspergillus awamori MK788209 cellulase production
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Table 4 Analysis of variance (ANOVA) for CCD design for Aspergillus awamori MK788209 cellulase production
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Applications of Aspergillus awamori MK788209 culture filtrate

Saccharification of agricultural wastes using Aspergillus awamori MK788209 culture filtrate

Eight agricultural wastes were used (CC, LP, PS, OS, MS, RS, OP and PP) In this experiment, each agricultural waste (1 g) was treated with Aspergillus awamori MK788209 culture filtrate containing (13 U laccase, 6.67 U cellulase, 23.51 U xylanase, 31.20 U pectinase and 10.91 U amylase) dissolved in 10.00 ml of sodium acetate buffer (0.05 M, pH 5.00) and incubated at 50 °C for 24 h. The amount of reducing sugar released was measured by Somogyi method [24].

Improvement of reducing sugar recovery (saccharification) from PP by Central Composite Design (CCD)

The following variables were optimized in this step to maximize the recovery of reducing sugar: A: pea peel weight (g), B: culture filtrate units added (ml), and C: time of saccharification (h) using CCD. Five levels of testing (-1.682, -1.00, 0, + 1.00, and + 1.682) were applied to each factor, yielding fifteen runs (Table 5). Statistical analysis (ANOVA) verified the design’s success (Table 6).

Table 5 Central Composite Design for saccharification of PS by Aspergillus awamori MK788209 culture filtrate
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Table 6 Analysis of variance (ANOVA) for CCD design for saccharification of PS by Aspergillus awamori MK788209 culture filtrate
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Chromatographic analysis

Hydrolysis product was analyzed by descending paper chromatograph using Whatman No.1 and solvent system n-butanol: acetone: water (4:5:1, v/v/v) [25] and sprayed with aniline phthalate [26].

Biopolishing of cotton fabrics

Twill and satin cotton fabrics with and without sodium periodate pretreatment were treated with A. awamori MK788209 culture filtrate. Sodium periodate pretreated cotton fabrics were pretreated as followed: One gram of cotton fabric was immersed in 20 ml of 0.05 M sodium periodate solution and reacted at 50 °C. After oxidation, the cotton fabric washed with distilled water for several cycles. Cotton fabrics that had been bleached and oxidized were biopolished using the culture filtrate of A. awamori MK788209. This biotreatment was conducted in acetate buffer containing Egyptol (0.5 g.l-1) at pH 6.00 and material to liquor ratio 1:50, biotreatment was carried out at concentrations of cellulase enzymes (20 ml.l-1), temperatures 50 °C for 45 min in ultrasonic water bath. Then the cotton sample was washed by hot water and dried in an oven at 80 °C. Finally, the fabrics were dried in ambient conditions. Weight loss (%) in fabric weight was calculated from the difference in fabric weight before and after the treatment. Whiteness index was evaluated with a Color-Eye 3100 Spectrophotometer from SDL Inter [27]. Surface roughness was monitored according to JIS 94 standard, using surface roughness measuring instrument, SE 1700a made in Japan. The color strength, expressed as K/S value, of the obtained dyeing’s was measured at the wavelength of maximum absorbance using an automatic filter Spectrophotometer, and calculated by the Kubelka Munk equation [28]: K/S = (1 − R)2/2R, where K is the absorption coefficient, S is the scattering coefficient, and R is the reflectance of the dyed samples. Morphology study of the fabrics, the untreated and treated fabrics were analysed by scanning electron microscopy (SEM) and morphological changes of the surface structure.

Enzymatic desizing and half bleached treatment

In this experiment one type of cotton fabric was used. With a material to liquor ratio of 1:30, the aqueous desizing solution was made up of enzyme solution (30 ml.l− 1), NaClO2 (5 g.l− 1), and non-ionic wetting agent (1 g.l− 1). The reaction was conducted in buffer solution. The fabrics underwent a 30-minute treatment at 60 °C, followed by padding, patching, and another 30 min in oven. They were then twice washed, once with hot water and once with cold water, and dried. The amount of time needed for a water drop to penetrate a piece of fabric was used to estimate wettability. The violet scale shade and TEGEWA scale method were used to evaluate desizing efficiency [29].

Coloration of the biotreated cotton samples by dyeing technique

Reactive red dye was used to dye treated cotton fabrics, according to Li et al. [29]. The dyeing process involved the use of sodium sulfate (60 g.l-1) for 30 min at 40 °C, followed by a fixation period of 60 min at 60 °C in sodium carbonate (20 g.l-1). After dying the samples, they were cleaned and allowed to air dry.

Coloration of the biotreated cotton samples by pigment printing technique

Pigment printing was used to print on cotton fabric. Hebeish et al. [30] provided the method for preparing the printing paste. The samples were cleaned in accordance with the guidelines provided in the AATCC test method [31]. The AATCC test procedures were followed to determine the color fastness to rubbing, perspiration, and light [32,33,34].

Results and discussion

Screening of different agricultural wastes for A. awamori MK788209 cellulase production

The nucleotide sequence of the newly isolated endophytic fungus was identified as A. awamori, submitted to the GenBank and assigned accession number MK788209. SSF of the aforementioned wastes was used to produce cellulase. Compared to submerged fermentation for fungi, this technique has the advantage of producing higher titres of enzymes [20]. The substrate is a critical key component in any enzyme production process. All of the added agricultural wastes could be utilized by A. awamori MK788209, which produced cellulase to varying degrees (Fig. 1). I.e. Cellulase production was in the following order MS > AL > PP > RS > CC > LP > OP. This can be attributed to the different content of lignin of each agricultural waste which is resistant to microbial attack [35] and can impede enzymatic hydrolysis by adhering to cellulose and reducing the amount of enzyme available for enzymatic hydrolysis [36]. Accordingly, MS was found to be the best agricultural waste in our investigation for maximizing cellulase production (2.03 U.ml− 1). According to Ahmed et al. [37], MS had a composition of 44% carbohydrates, 22% protein, 16% ash, 5% moisture, 2% fat, 11% fiber, and vitamins. This made MS an ideal solid substrate because it gave the microorganism all the nutrients it needed for maximum production. Many agricultural wastes have been reported to induce the cellulase production as wheat straw [38], wheat bran [39], rice straw [40], Oil palm [41] and sorghum husk [42].

Fig. 1
figure 1

Screening of different agricultural wastes for A. awamori MK788209 cellulase production

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Optimization of Aspergillus awamori MK788209 cellulase production by Plackett-Burman Design (BPD)

The results, as displayed in Table 1, demonstrated the significant impact of the various factors on cellulase production, with cellulase production varying widely across the twelve trials (0.929–4.636 U.ml− 1). Trail 12 produced the highest level of cellulase (4.64 U.ml− 1), leading to a 2.51-fold increase. The following formula can be used to calculate the cellulase activity (U.ml− 1):

Cellulase activity (U.ml− 1) = + 2.84 + 0.72 * molokhia stalks weight + 0.54 * incubation time − 0.19* bakers yeast − 0.22 * peptone + 0.11 * (NH4)2SO4 +0.13 * CaCl + 0.12 * KCl.

Only seven of the eleven factors that were examined, including the weight of the molokhia stalks, the incubation period, baker’s yeast, peptone, ammonium sulfate, calcium chloride, and potassium chloride, were found to be significant, as shown in Fig. 2. This result is similar to what Vu et al. [43] reported. The remaining four factors (glucose, lactose, CuSO4, and FeSO4) had no effect on the production of cellulase by Aspergillus awamori MK788209. In contrast to that reported by Sorour et al. [44] and Gunny et al. [45].

Fig. 2
figure 2

Pareto chart showing the effect of each factor on A. awamori MK788209 cellulase production

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The abovementioned seven significant factors were categorized as positive or negative factors affecting A. awamori MK788209 cellulase production. The weight of the molokhia stalks, the incubation period, (NH4)2SO4, CaCl, and KCl were the positive factors. On the other hand, peptone and baker’s yeast were negative factors. Molokhia stalk weight and incubation duration had the greatest positive effects on cellulase production out of the five positive significant factors.

The effectiveness of the design for cellulase production was indicated by the analysis of variance as shown in Table 2. The R2 value of 0.9782, which shows that 97.82% of the response variability could be explained by the model, validated the design’s variability. The model is successful because the adjusted R2 of 0.9401 and the predicted R2 of 0.8038 were near to each other. An adequate signal was indicated by the analysis’s adequate precision of 17.409 for cellulase production. Coefficient of variation (CV) was a measure of precision with which experiments were conducted and its value was found to be 8.80. Low CV value predicts accuracy and reliability of the experiments conducted [46].

Central Composite Design (CCD)

The quantitative impact and interaction between the two most important variables (molohkia stalks weight and incubation time) on A. awamori MK788209 cellulase production determined from PB design were shown in Fig. 3a. According to Table 3, trial number 10 produced the maximum cellulase (9.00 U.ml− 1). The resulted fold increase was 1.94 and 4.86 fold, when compared to the PBD and unoptimized medium, respectively. Compared to what Premalatha et al. [47] reported, this cellulase yield was higher. Also Verma and Kumar [48] applied Box-Bhenken Design (BBD) to study the levels of three variables (temperature, process pH, inoculum dosages) for cellulase production via SSF of wheat bran by Aspergillus niger. In optimization process, the decrease in enzyme production at higher substrate might be due to the microbial growth inhibition. While, enzyme production increases with increase in time period, after a specific time the accumulation of wastes worsens the situation and substrate becomes a limiting factor [38].

Fig. 3
figure 3

a: Contour plot showing interaction between molohkia stalks weight and incubation time; b: Parity plot to show the distribution of observed and predicted values for A. awamori MK788209 cellulase production

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The following equation can be used to determine the cellulase activity (U.ml− 1):

Cellulase activity (U.ml− 1) = + 6.85 + 0.81 * molohkia stalks weight − 0.40 * incubation time + 1.34 * molohkia stalks weight * incubation time + 0.11 * molohkia stalks weight2 + 0.21 * incubation time2.

Plotting the observed and predicted values of cellulase activity revealed a good agreement between the experimental and predicted values, with the data points localized near the diagonal line in Fig. 3b. The goodness of fit of the model was checked by determination of coefficient R2 0.9878. The closer the R2 is to 1.0, the stronger the model and the better it predicted the activity [49]. The adjusted R2 value of 0.9792 and the predicted R2 value of 0.9136 agreed reasonably well. Table 4 indicates that the model proved to be significant based on its F-value of 113.77. Prob > F values less than 0.0500 suggested that the model terms were significant. Low CV% value 2.23 predicted accuracy and reliability of the experiments conducted [46]. The effectivenes of this design for Aspergillus awamori MK788209 cellulase production which indicated by mentioned R2, predicated R2 and adjusted R2 were close to that reported by other authors [45, 47, 50].

Saccharification of agricultural wastes by A. awamori MK788209 culture filtrate

In this experiment, we utilized A. awamori MK788209 culture filtrate which was rich in lignocellulolytic enzymes [laccase, cellulase, xylanase, amylase and pectinase] in reducing sugar recovery from agricultural wastes. As shown in (Fig. 4) A. awamori MK788209 culture filtrate was capable of hydrolyzing all the agricultural wastes with varied degrees depending on the lignin, cellulose, xylan, starch and pectin contents. The order of sugar recovery was as follow PP > LP > OP > MS > CC > PS > OS > RS. Furthermore, it was demonstrated that a combination of reducing sugars, including glucose, xylose, and galacturonic acid, were produced by the enzymatic hydrolysis of various agricultural wastes. PP produced the highest reducing sugar (98.33 mg.ml− 1), which was higher than previously reported [41, 50]. Various lignocellulosic materials were used in several saccharification studies [51,52,53,54,55,56].

Fig. 4
figure 4

Paper chromatography for enzymatic hydrolysis of different agricultural wastes by A. awamori MK788209 culture filtrate

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Optimization of saccharification by CCD

In general, the RSM optimization outperformed the traditional optimization techniques in improving the experimental results. Using RSM, Tanyildizi et al. [57] and Mahat et al. [58] have reported increases in production yield of 15% and 34%, respectively. Additionally, Santos Gomes [59] used Penicillium roqueforti endoglucanase to saccharify sugarcane bagasse, coconut shell, wheat bran, cocoa fruit shell, and cocoa seed husk. They used the Box-Behnken design to assess the effects of three factors on the production of fermentable sugar: substrate concentration, time, and enzyme concentration. They saccharified wheat bran under ideal conditions, (253.19 mg/g of fermentable sugars were obtained), this was 41.5 times more than what was obtained without optimizing. As shown in Table 5 the highest sugar recovery was obtained in trial 16 (338.18 mg.ml− 1) causing 3.44-fold increase compared to unoptimized conditions.

The sugar recovery can be calculated from the following equation:

Reducing sugars (mg.ml− 1) = + 151.79 + 50.21* A -92.65 * B -24.55* C.

The suceess of the design was emphasized by analysis of (ANOVA) as shown in Table 6. Moreover, The Pred R2 of 0.8840 was in reasonable agreement with the Adj R2 of 0.9256. The value of R2 was 0.9373 meaning that 93.73% of the results can be explained by the design. The model F-value of 79.79 implied the model was significant. There was only a 0.01% chance that a “Model F-Value” this large could occur due to noise.

Textile application of A. awamori MK788209 culture filtrate

The results of treating textile samples with A. awamori MK788209 culture filtrate varied depending on two main factors, as indicated in Table 7: the type of fabric sample and fabric pretreatment with sodium periodate. Compared to satin, the treatment of twill fabric with A. awamori MK788209 culture filtrate had a greater positive impact. The surface became smoother in both instances, as seen in Fig. 4b and d. This could be because cellulase hydrolyzed easily accessible pills or fibrils at the surface of the treated substrate. These findings were superior to those published by Abd El Aty et al. [6] and consistent with other earlier research [60]. The cotton fibers’ surface morphology appeared to be completely unaltered after being treated with the A. awamori MK788209 culture filtrate, according to scanning electron micrographs of the samples.

Table 7 Effect of enzymatic treatments on some physicochemical an color properties of cotton fabrics
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Additionally, the results in Table 7 demonstrated how A. awamori MK788209 culture filtrate affected some color characteristics of twill and satin fabric samples. These color properties, expressed as K/S values, showed that enzymatic treatment of the twill and satin fabric improved their printing ability. The bio-treated fabric’s higher K/S can likely be attributed to the formation of new dye-absorbing surfaces, changes in pore structure, and simultaneous removal of fibrillar matter, which increase the amount of dye diffusion and penetration into the treated fabric’s structure and fixation of dye molecules.

Also, periodate pretreatment followed by enzymatic treatment improved the dyeability of twill and satin fabrics compared to the bleached twill and satin fabrics. This can be explained by the fact that sodium periodate produced several aldehyde groups in cotton and reduced its crystallinity. The aldehyde groups enhanced cellulase binding to cotton substrates, which in turn enhanced dyability [61, 62]. These outcomes were almost identical to those reported by Abd El Aty et al. [6] for the textile application of Trichoderma longibrachiatum KT693225 cellulase on cotton (white), linen (white), and indigo-dyed fabrics. Furthermore, after treating twill fabric with A. awamori MK788209 culture filtrate, a significant improvement in the whiteness index was noted.

Moreover, the desizing of cotton fabric showed 5.2% weight loss, 61 whitness index and violet scale shade of 7. These results were similar to that declared by Abd El Aty et al. [6]. Scanning electron micrographs of the samples (Fig. 5) showed the starch particles on the surface of the fibers of the sized sample, whereas the sample treated with A. awamori MK788209 culture filtrate had no starch particle adhered to its surface. This finding confirmed the ability of A. awamori MK788209 culture filtrate to desize cotton fabrics. Yahya et al. [63] reported 9% weight loss and TEGEWA scale 9 of gray cotton desizing by amylase from A. tubingensis SY 1.

Fig. 5
figure 5

SEM for a: untreated twill cotton fabric b: A. awamori culture filtrate treated twill cotton fabric c: untreated satin cotton fabric d: A. awamori culture filtrate treated satin cotton fabric

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The dyed fabric treated with enzyme showed K/S of 2.87. This high K/S value may be due to enzyme action on fabric impurities leading to cleaner surface and modification of the pore microstructure. Thus, by thermo-fixation the binder film formed covered the entire fiber surface [64].

Curcumine dye was used in cotton printing as an eco- friendly dye with well known antimicrobial activity. The biotreated printed fabric had K/S value of 1.25. The fastness properties presented in Table 8 showed that washing and perspiration fastness properties of fabrics ranged from good to very good. While, light fastness properties ranged from very good to excellent.

Table 8 Fastness properties of biotreated dyed and printed cotton samples
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Cellulase was well-produced by Aspergillus awamori MK788209 utilizing a variety of lignocellulolytic wastes, particularly molokhia stems. As A. awamori culture filtrate was rich in lignocellulolytic enzymes, the saccharification process of agricultural wastes yielded reducing sugar which can be very beneficial in bioethanol industry. Moreover, A. awamori culture filtrate showed high effectiveness in improving the physicochemical and color properties in treatment of twill and satin cotton fabrics.

Data availability

Not applicable.

Abbreviations

A. awamori :

Aspergillus awamori

SSF:

Solid state fermentation

PP:

Pea peels

CCD:

Central Composite Design

PB:

Plackett-Burman design

CC:

Corn cobs

LP:

Lemon peels

PS:

Potato shells

OS:

Okra suppression

MS:

Molokhia stem

RS:

Rice straw

OP:

Onion peel

CV:

Coefficient of variation

References

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Acknowledgements

This work was financially supported by the research projects sector in the National Research Centre, Dokki, Giza, Egypt. The work was a part of an internal project (No. 11070202) entitled “Production of some microbial enzymes using agricultural residues and their applications in textile and food industries”.

Funding

This work was financially supported by the research projects sector in the National Research Centre, Dokki, Giza, Egypt. The work was a part of an internal project (No. 11070202) entitled “Production of some microbial enzymes using agricultural residues and their applications in textile and food industries”.

Open access funding provided by The Science, Technology & Innovation Funding Authority (STDF) in cooperation with The Egyptian Knowledge Bank (EKB).

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Authors and Affiliations

  1. Chemistry of Natural and Microbial Products Department, National Research Centre, Dokki, Giza, 12622, Egypt

    Faten A. Mostafa, Hala R. Wehaidy & Shireen A.A. Saleh

  2. Preatreatment and finishing of cellulosic based fabric Department, National Research Centre, Dokki, Giza, 12622, Egypt

    Samar Sharaf

  3. Dying, Printing and Textile Auxiliaries Department, National Research Centre, Dokki, Giza, 12622, Egypt

    Heba M. El-Hennawi & Safia A. Mahmoud

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  1. Faten A. Mostafa
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Contributions

F.A.M: Conceptualization, Methodology, Performing the experiments, Software, Validation, Formal analysis, Investigation, Resources, Data, Writing original draft, Editing, Visualization. H.R.W.: Performing the experiments, Resources, Data, Visualization. S.S.: Textile enzymatic treatment (biopolishing and desizing), Data. H.M.E.: Textile dying and printing, Data. S.A.M.: Textile dying and printing, Data. S.A.A.S.: Conceptualization, Methodology, Performing the experiments, Validation, Investigation, Resources, Data, Writing& editing, Visualization.

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Correspondence to Shireen A.A. Saleh.

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Mostafa, F.A., Wehaidy, H.R., Sharaf, S. et al. Aspergillus awamori MK788209 cellulase: production, statistical optimization, pea peels saccharification and textile applications. Microb Cell Fact 23, 11 (2024). https://doi.org/10.1186/s12934-023-02286-w

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Microbial Cell Factories

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