Table 1 Main absorption bands and assignments related to biogenic SeNPs and TeNPs produced by Ochrobactrum sp. MPV1

~ 3500

OH stretching in carbohydrates

~ 3300

NH stretching in proteins and peptides

~ 3185

Amide II overtone

~ 3085

NH stretching in proteins and peptides

~ 2960

CH₃ asymmetric stretching in lipids

~ 2925

CH₂ asymmetric stretching in lipids

~ 2875

CH₃ symmetric stretching in lipids

~ 2855

CH₂ symmetric stretching in lipids

~ 1735

C=O stretching in aliphatic polyesters

~ 1650/1630

Amide I

~ 1540/1530

Amide II

~ 1515

Tyrosine

~ 1450

CH₂/CH₃ bending vibrations in lipids and proteins

~ 1390

C=O of COO⁻ symmetric stretching in proteins

~ 1240

PO₂ asymmetric stretching in phospholipids

~ 1100

Glycosidic linkage vibrations

~ 1080

PO₂ symmetric stretching in phospholipids

~ 1045

C–O stretching modes in carbohydrates