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Milk is susceptible to microbial contamination due to its high nutrient contents. The presence of microbial contamination can damage the nutrients in milk such as protein, fat and lactose. Therefore, there is a need to keep milk quality. ZnO doped N thin film can kill pathogenic bacteria. The aim of this research is to investigate the number of bacteria and milk nutritions (protein, lactose and fat) due to ZnO doped N thin film. Milk samples were obtained from smallholder dairy farm in Central Java. Fresh milk was poured in a beaker glass, then ZnO doped with N thin films and illuminated with visible light. The testing scheme was carried out for 0, 60, 120 and 180 minutes in the refrigerator. Total bacteria was calculated using Total Plate Count (TPC) method. Milk nutrition received using lactoscan (MMC, Bulgaria). The conclusion of this research is ZnO doped N thin film with visible light could reduce total bacteria by 95.2%,  Coliform  by 66%,  S. aureus  by 94.4% and milk nutritions in accordance with Indonesian National Standards of fresh milk. Suggestions from this study, it is necessary to apply ZnO doped N thin films in food technology as an effort to maintain milk quality.

Total bacteria and milk nutrition using ZnO doped N thin film with visible light to maintain milk quality