Characterization of the physicochemical properties of the biosurfactant produced by L. acidophilus and L. pentosus

  • Nagea Abdalsadiq, Dr.
  • Zaiton Hassan
  • Mohd LANI
Keywords: Biosurfactant, Emulsification index, Surface tension, critical micelle concentration, L. acidophilus, L. pentosus

Abstract

Biosurfactants or surface-active compounds are biodegradable, non-toxic and ecofriendly
compounds released by microorganisms. Biosurfactants are amphiphilic compounds cause
surface tension reduction both aqueous solutions and hydrocarbon mixtures. The main purpose
of this work was to characterize biosurfactant produced by Lactobacillus strains. Identification
using 16s rDNA identified the isolates as L. acidophilus for Fm1 and L. pentosus for Y1. Effect
different parameters (temperature, PH and Salinity) were studied to evaluate the stability of
biosurfactant after treatment. In addition, critical micelle concentration of biosurfactant,
emulsification index and viscosity reduction of palm and engine oils have been studied. The
results revealed that, the biosurfactant from L. acidophilus and L. pentosus maintains its
emulsifications activities unaffected in the wide range of parameter's study except slightly
decreasing in emulsification index values at salinity 15%. The maximum reduction in surface
tension was 18.05 mN/m with minimum concentration of critical micelle concentration of 7.5
mg/ml and high decrease of palm and engine oil viscosity of 110.1 and 165.3% respectively. This
study concluded that, the emulsification activity, the surface activity and the stability to heat
treatment, different PH and salinity of biosurfactant of Lactobacillus strains revealed the
application of the biosurfactant in food, pharmaceutical, cosmetics industries and oil recovery.

Author Biographies

Nagea Abdalsadiq, Dr.

Department of Microbiology, Faculty of Science and Technology, Universiti Sains Islam
Malaysia (USIM), 71800 Nilai, Negeri Sembilan, Malaysia.

Zaiton Hassan

Department of Microbiology, Faculty of Science and Technology, Universiti Sains Islam
Malaysia (USIM), 71800 Nilai, Negeri Sembilan, Malaysia.

Mohd LANI

School of Food Science and Technology, Universiti Malaysia Terengganu (UMT), 21030
Kuala Terengganu, Terengganu, Malaysia

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Published
2018-11-30