Table 2 Assignment of all lipopeptides mass peaks obtained by MALDI-TOF mass spectrometry of biosurfactant produce by B. amyloliquefaciens strain AR2 while growing on different carbon substrate

1016.52, 1044.69

C₁₃ surfactin [M + Na]⁺ Val-7, C₁₄ surfactin [M + Na]⁺ Leu/lle-7

1065.58, 1079.6, 1081.57, 1095.61, 1108.52

C₁₄ iturin [M + Na]⁺, Asn-1; C₁₅ iturin [M + Na]⁺, Asn-1; C₁₄ iturin [M + K]⁺, Asn-1; C₁₅ iturin [M + K]⁺, Asn-1; C₁₆ iturin [M + K]⁺, Asn-1

1471.62, 1485.86, 1503.60, 1515.89, 1529.89

C₁₅ fengycin [M + Na]⁺, Ala-6; C₁₆ fengycin [M + Na]⁺, Ala-6;C₁₇ fengycin [M + H]⁺, Vla-6;C₁₇ fengycin [M + K]⁺, Ala-6: C₁₆ fengycin [M + K]⁺, Vla-6

1065.60, 1079.70, 1081.57,1095.67

C₁₄ iturin [M + Na]⁺, Asn-1; C₁₅ iturin [M + Na]⁺, Asn-1; C₁₄ iturin [M + K]⁺, Asn-1; C₁₅ iturin [M + K]⁺, Asn-1

1065.59, 1079.61, 1081.61, 1095.58, 1108.52

C₁₄ iturin [M + Na]⁺, Asn- 1; C₁₅ iturin [M + Na]⁺, Asn- 1; C₁₄ iturin [M + K]⁺, Asn-1; C₁₅ iturin [M + K]⁺, Asn-1; C₁₆ iturin, [M + K]⁺, Asn-1

1065.60, 1079.61, 1081.61, 1095.57, 1108.56

C₁₄ iturin [M + Na]⁺, Asn-1; C₁₅ iturin [M + Na]⁺, Asn-1; C₁₄ iturin [M + K]⁺, Asn-1; C₁₅ iturin [M + K]⁺, Asn-1; C₁₆ iturin, [M + K]⁺, Asn-1

1032.33

C₁₃ surfactin [M + K]⁺, Val-7

1065.62, 1079.60, 1081.61, 1095.59, 1108.59

C₁₄ iturin [M + Na]⁺, Asn-1; C₁₅ iturin [M + Na]⁺, Asn-1; C₁₄ iturin [M + K]⁺, Asn-1; C₁₅ iturin [M + K]⁺, Asn-1; C₁₆ iturin [M + K]⁺, Asn-1

1471.82, 1485.84, 1513.84

C₁₅ fengycin [M + Na]⁺, Ala-6; C₁₆ fengycin [M + Na]⁺ Ala-6; C₁₆ fengycin [M + Na]⁺, Vla-6

1044.69

C₁₄ surfactin [M + Na]⁺, Leu/Ile-7

1065.59, 1079.63, 1081.57, 1095.63, 1108.59

C₁₄ iturin [M + Na]⁺, Asn-1; C₁₅ iturin [M + Na]⁺, Asn-1; C₁₄ iturin [M + K]⁺, Asn-1; C₁₅ iturin [M + K]⁺, Asn-1; C₁₆ iturin [M + K]⁺, Asn-1

1471.82, 1485.84, 1503.84, 1515.89, 1529.89

C₁₅ fengycin [M + Na]⁺, Ala-6; C₁₆ fengycin [M + Na]⁺, Ala-6; C₁₇ fengycin [M + H]⁺, Vla-6; C₁₇ fengycin [M + K]⁺, Ala-6; C₁₆ fengycin [M + K]⁺, Vla-6