Amino acid profiling, viscosity and antibacterial activity of acacia gums from different locations in India
Viscosity of acacia gums (also known as gum arabic) viz. Acacia senegal, Acacia nilotica, collected from different places, and that procured from Merck India Ltd. and Himedia, was determined using Digital Brookfield Viscometer. All the A. nilotica gum exudates showed Newtonian behavior with viscosity being shear rate independent and concentration dependent. Five percent solution of A. senegal, Sudan (ICAR-CAZRI, Jodhpur) displayed fairly high cP value (509.45) and exhibited non-Newtonian shear thinning / pseudoplastic characteristics. In the amino acid analysis of gum samples by reversed phase-high performance liquid chromatography, glycine was found to be present only in A. senegal, Sudan (ICAR-CAZRI, Jodhpur) and that too in a very high quantity (388.67 mg/g of gum) in comparison to other gum samples analyzed during the study. Proline was also on the higher side (31.31mg/g of gum). There appears to be some correlation between viscosity and the glycine as well as proline amino acid contents. Only two A. nilotica gum samples possess antimicrobial activity may be due to the presence of higher tannin content in them.
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