Jurnal Pangan dan Agroindustri (Jul 2023)
EFFECT OF FREQUENCY AND DURATION OF THERMOSONICATION ON THE PHYSICAL, CHEMICAL AND MICROBIOLOGICAL QUALITY OF COW'S MILK
Abstract
ABSTRACT Milk is a food product that contains many nutrients. Thermosonication is a methodcombining ultrasonic and medium-temperature heating that can be used as an alternativepasteurisation method because it can maintain the nutrients contained in milk while providingsafety assurance for consumption. This study aimed to determine the effect of frequency andduration of thermosonication on the physical, chemical and microbiological quality of cow'smilk. The experimental design used was a completely randomised design (CRD) with twofactorials of frequency (20 and 22kHz) and duration of thermosonication (5, 10, 15 and 20minutes).ThedataobtainedwereanalysedwithANOVAandBNJfurthertestsatthe5%level.Thebesttreatmentwas22kHzfrequencyfor20minuteswiththeresultsofviscosity3.80±0.000 cP, pH 6.8 ± 0.00, fat content 3.22 ± 0.00%, protein content 2.19 ± 0.01% and totalbacteria 0.53 ± 0.67 log CFU/ml, and was able to reduce Escherichia coli bacteria by 2.95 logCFU/ml. Keywords:Escherichiacoli, Milk,Thermosonication
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