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Journal : Jurnal Gizi

Identifikasi Karakteristik Kimiawi dan Daya Simpan Kefir Susu Jagung (Zea mays L. Saccharata) Lestari, Yanesti Nuravianda; Amin, Nur; Ananda, Duyung; Rengganis, Nimas Ayu
Jurnal Gizi Vol 10, No 2 (2021): Jurnal Gizi UNIMUS
Publisher : Universitas Muhammadiyah Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26714/jg.10.2.2021.20-32

Abstract

Kefir is a food-based on pasteurized milk fermented using lactic acid bacteria, aceticacid bacteria, and yeast. The study aims to analyze proximate levels (carbohydrates, proteins,and fats) and identify the characteristics of sensory changes during storage. This true experimental study uses a complete randomized design with 1 factor. Thecomposition of corn milk kefir consists of 3 levels (K1=corn milk: skimmed milk 100:0;K2=corn milk: skimmed milk 75:25; K3=corn milk: skimmed milk 50:50).  Data analysisusing One Way Anova showed that carbohydrate content (10.31 + 1,426), fat (0.18 + 0.018),and protein (1.83 + 0.973) significantly different (p=0.0001). The 35 days of storage in the refrigerator (2-8C) results in a change in kefir colorbecoming more faded. The kefir texture before storage is different for each kefir compositionand becomes more viscous at the end of the storage period. The sour aroma of kefir willincrease during kefir storage. It can be concluded that protein and fat levels increase alongwith an increase in the amount of skimmed milk addition, while carbohydrate levels decreaseat the addition of the most skimmed milk (K3).Keywords: kefir, proximate, sensory characteristics, shelf-life, skimmed milko
Pengaruh Suhu dan Lama Penyimpanan Terhadap Kadar Vitamin C pada Jus Jambu Biji (Psidium Guajava L.) Hapsari, Yuliana Indra; Lestari, Yanesti Nur Avianda; Prameswari, Galuh Nita
Jurnal Gizi Vol 12, No 1 (2023): Jurnal Gizi UNIMUS
Publisher : Universitas Muhammadiyah Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26714/jg.12.1.2023.37-45

Abstract

Guava juice is one of the healthiest drinks and can be used as a healthy snack. However, people tend to wait for a certain period of time to consume juice. This can affect the levels of vitamin C in it. The purpose of this study was to identify the effect of temperature and storage time on vitamin C levels in guava juice (Psidium guajava L.). The research design was a factorial randomized block design (RAK) with a 2 x 3 pattern, which consisted of two factors, namely: The influence of storage temperaturewhich consisted of 2 levels, namely cold temperature (6.6 -10°C) and roomtemperature (28 -32 °C) and the storage time factor consisted of 3 levels, namely 30 minutes, 60 minutes, and 90 minutes so that the total treatment in this study amounted to 6 treatments. Analysis of vitamin C in this study used the UV-VIS spectrophotometry method. Each treatment will be repeated measurements of vitamin C levels 3 times. The data that has been obtained were analyzed using the Friedmann test with the MannWhitney advanced test (CI = 95%). The results showed that there was an interaction between the combination of temperature and storage time which significantly affected the decrease in vitamin C levels in guava juice (Psidium guajava L.). The lowest vitamin C content in guava juice (Psidium guajava L.) was found in the L2S2 treatment, namely storage at room temperature with a storage time of 60 minutes. In waiting for consumption, people should store fruit juice in the refrigerator so that the vitamins they get are more optimal.Keywords: Vitamin C, Fruit Juice, Guava, Temperature, Storage Time, Spectrophotometry.