Evaluation of the Quality of Pasteurization Goat Milk On Storage Using Electricity of Room and Refrigerator Temperature With Different Storage Duration
Abstract
The purpose of this study was to evaluate the quality of pasteurized goat milk using electricity according to Indonesian National Standards at room and refrigerators temperature storage. The research material is pasteurized goat milk using electricity. The equipments used were pasteurization machine, plastic bottle, volumetric flask, refrigerator, a set of equipment for testing the milk quality. This study was an experimental research using a completely randomized design. There were two treatments tested. The first one was storage at room temperature for 6, 9, and 12 hours and the second one was storage in the refrigerator for 6, 9 and 12 days. Milk samples were taken by purposive sampling at a temperature of 75oC. The variables measured were milk quality (specific density, fat and protein content, pH and amount of bacteria). The collected data was analyzed by F-test.  The results of the study showed that the storage time had a very significant effect (P <0.01) on the quality of milk. Storage at room temperature for 12 hours was still in accordance with Indonesian National Standards, the average value of specific density by 1.0282 g/cm3, fat content by 4.00%, protein content by 2.75%, acidity (pH) by 6.50 and the amount of bacteria by 8.2 x 105/ml, while those stored in the refrigerator for were 12 days had  the average value of specific density by 1.0285 g/cm3, fat content by 4.40%, protein content by 3.0%, acidity (pH) by 6.75 and the amount of bacteria by 6.5 x 105/ml. The results concluded that pasteurized goat milk using electricity can hold 12 hours at room temperature storage and 12 days on storage in a refrigerator. The results suggest that evaluation of quality of the pasteuriation goat milk using electricity need to test at longer storage.
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Key words: Pasteuriation goat milk using electricity, Room and Refrigerator Temperature, Quality of goat milk.
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