Simultaneous UV-C and Ultrasonic Energy Treatment for Disinfection of Tomatoes and Its Antioxidant Properties

Okon J. Esua, Department of Agricultural and Food Engineering, University of Uyo, Uyo, Nigeria, Nyuk L. Chin, Yus A. Yusof
2018 Journal of Advanced Agricultural Technologies  
The simultaneous use of UV-C radiation at 640 or 900 µWcm -2 and ultrasonic energy of 13.78 W/L at 40 kHz was applied on tomatoes to study its ability to disinfect tomatoes from microbes. Total aerobic bacteria and yeast and mold population decreased with increase of UV-C dosage application from 0.72-10.76 kJ/m 2 at constant ultrasonic energy supply. At simultaneous treatment dosage of 6.46 kJ/m 2 , total aerobic bacteria were significantly (p<0.001) reduced by 2 log reductions. Yeast and mold
more » ... urvivors were undetected at higher dosage treatment from 4.31 to 10.76 kJ/m 2 . Lower dosage treatment from 0.72 to 2.15 kJ/m 2 presented minor log reductions of 0.14 to 0.75. The treatment also stimulated 41.26-50.37% increase of total phenols from an initial value of 13.38 mg GAE 100g -1 FW. Antioxidant activity increase from 27.51-36.07% was obtained at dosage level of 8.61 kJ/m 2 .  Index Terms-total aerobic bacteria, yeast and mold, total phenolic content, antioxidant activity, hydrophilic extract
doi:10.18178/joaat.5.3.209-214 fatcat:qczraplgonfebngm4ahmbdovb4