Effect of jasmine-essential oil encapsulated in modified starch on the survival of Staphylococcus aureus inoculated in Lookchup
2011
Niporn Dejsuk(King Mongkut's University of Technology Thonburi, Bangkok (Thailand). Faculty of Science. Department of Microbiology) | Punchira Vongsawasdi(King Mongkut's University of Technology Thonburi, Bangkok (Thailand). Faculty of Science. Department of Microbiology) E-mail:[email protected] | Montira Nopharatana(King Mongkut's University of Technology Thonburi, Bangkok (Thailand). Faculty of Science. Department of Food Engineering) | Chirasak Phadthong(King Mongkut's University of Technology Thonburi, Bangkok (Thailand). Faculty of Science. Department of Microbiology) | Thiwanan Punyamoonwongsa(King Mongkut's University of Technology Thonburi, Bangkok (Thailand). Faculty of Science. Department of Microbiology)
Objective of this research was to investigate the combined effects of microencapsulation technique and jasmine-essential oil on the survival of Staphylococcus aureus inoculated in lookchup. The results showed that as the concentration of essential oil increased, the number of S. aureus decreased (p LT=0.05). The amount of S. aureus decreased by 33.52-100 percent when the concentrations of essential oil of 20-32 mg/ml were used. Since the MICs of S. aureus was 32 mg/ml, the concentration of jasmine-essential oil at 32 mg/ml was selected for producing microcapsules with the ratio of essential oil and modified starch of 10:90, 20:80 and 30:70. The results indicated that storage time had significant effect on quality of lookchup inoculated with 6.51 log cfu of S. aureus/g (p LT= 0.05). Regardless of essential oil and modified starch ratios, the amount of S. aureus in lookchup reduced in 3 days at 4+-2 deg C and 2 days at 30+-2 deg C. Later, the number of S. aureus in lookchup encapsulated at the ratio of 10:90, 20:80 and 30:70 increased and became closed to that of the initial microbial concentration after storage for 12, 15, 21 days, respectively at 4+-2 deg C and 6, 8, 10 days, respectively at 30+-2 deg C.
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