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Received : Oct 9th, 2019 Abstract. Red guava has high level of vitamin C, so it can be used as a source of vitamin C, also has a distinctive color. This study aims to determine the effect with different concentration of guava juice on lactic acid levels, vitamin C and acceptability of cow milk yogurt set. The experimental method used Completely Randomized Design (CRD) with four treatments increasing the concentration of red guava juice (0%, 5%, 10%, and 15%) and each treatment repeated five times. The results showed that the addition of the concentration of red guava juice by 0% to 15%, the lactic acid levels of different cow’s milk set yogurts showed a negative linear regression pattern with the regression y = -0,03724x + 1,10465 R2 = 0,99699, and increasing vitamin C levels following a positive linear regression pattern y = 1,2932x – 0,324 R2 = 0,9452. The concentration of red guava juice 15% produced the best cow’s milk set yogurt with 0,55% lactic acid levels and 20,69 mg/100 g vitamin C levels produces and produced the most preferred acceptability value with hedonic scale likes and numeric scales 2,20.

Pengaruh Penambahan Konsentrasi Jus Jambu Biji Merah (Psidium guajava L.) terhadap Kadar Asam Laktat, Vitamin C, dan Akseptabilitas Set Yogurt