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Kombucha tea is a drink produced through a fermentation process of a mixture of tea and sugar using kombucha culture or also called SCOOBY ( Symbiotic Culture of Bacteria and Yeast) . The basic ingredients for making kombucha tea are granulated sugar solution and tea bags, in this study it was varied using fruit skin. Vitamin C is known as an important antioxidant found in many fruits, including in rujak fruit skin which is often considered waste. The purpose of this study was to determine the levels of vitamin C in kombucha tea fermented from fruit skin waste. This study used qualitative and quantitative methods. The qualitative method uses the Benedict test and the quantitative method uses the calculation of the percentage of vitamin C content using the iodimetric titration method. The results of the qualitative analysis of the Benedict test were positive for vitamin C with a change in the color of the sample solution to green-yellowish and the analysis of the percentage of vitamin C content obtained a result of 2.3124% or equal to 0.23124 mg / 10 mL of sample solution. The vitamin C content of kombucha tea can vary depending on the base ingredients used, fermentation time, and storage temperature.

Introduction: Single Cell Protein (SCP) is a term used for proteins produced from microbes such as bacteria, algae, yeasts, and fungi. One of the fungi known to produce PST is Aspergillus niger. Objective: The purpose of this study was to determine whether pineapple peel waste could produce single cell protein from A. niger culture and to determine differences in protein production with the addition of nutrients in the fermentation medium. Methods: This research method is an experimental method with the independent variables being MFKN1 medium (Pineapple Skin Fermentation Medium with the addition of KH2PO4 and sugar), and MFKN2 medium (Pineapple Skin Fermentation Medium with the addition of KH2PO4, (NH4)2SO4 and sugar); and the length of fermentation time used are days-0, 2, 4, and 6. The dependent variables of this study were analysis of protein content, dry weight of cells, glucose levels, pH and temperature. The data from this study were statistically analyzed using the two way Anova method. Results: The results of this study obtained the highest protein content in MFKN2 media, namely 0.80% (day-2); cell dry weight 0.473 g; glucose level 1.3406%; pH 4.6 and temperature 31 oC. Meanwhile, the highest protein content in MFKN1 media was 0.59% (day- 4); cell dry weight 0.346 g; glucose level 1.3406%; pH 3.7 and temperature 26.6 oC. Conclusion: The conclusion of this study is that pineapple peel waste can produce single cell protein from A. niger culture and there are differences in protein production results with the addition of nutrients, where protein content in MFKN2 medium is higher than protein content in MFKN1 medium.

Donuts are foods made from high protein wheat flour, in this study donuts were made from substitution of wheat flour and soybean flour. This study aims to determine the effect of soy flour substitution (Glycine max L.) and of determine fermentation time of (60, 75 and 90 min) on soy flour donuts which have the highest protein content and panelists' favorite. Complete Rendomized Design (RAL) Faktorial with two factors used in this research. The first  factor was is the ratio of  wheat flour and soy flour  (95;5, 90;10, 85;15) . The second  factor was is the variation of fermentation time (60, 75,  90 min). It was determined for protein, ash , water, fat , reducing sugar, total carbohydrates, and organoleptic. The data was determined Analysis using of Variance (ANOVA). The results showed that donuts with the addition of soy flour and fermentation time had a significant effect (α<0.05) on protein content, sugar content, flavor and overall preference. The best treatment of soybean flour donuts based on chemical and organoleptic tests, namely the ratio of wheat flour and soybean flour (85:15) using 90 minutes of fermentation. Soy flour donuts with the best treatment had a 20.30% of moisture; 1.77% ash content; protein content 10.38%; reducing sugar content 22.52%; total carbohydrates 49.51%; color dark brown 3.25; unpleasant flavor 2.95; savory taste 3.01 and very liked overall favorite 3,57.

Single cell protein is the term used for peoteins derived from microbes such as fungi. Pineapple waste is one of the alternative media that has easiest source of carbohydrates to obtain, so it has the potential for the growth of Saccharomyces cerevisiae. The purpose of this study was to determine wether pineapple waste could produce single cell protein production by adding nutrients to the fermentation medium. The research used in this research is experimental research. To determine the relationship between the independent variable and the dependent variable. Where the independent variables are the addition of nutrients and fermentation time on days 0,2,4,6  to see the dependant variable, namely the analysis of protein content, dry weight analysis of cells, analysis of glucose levels, pH and temperature analysis. The results of this study showed that the highest protein content was obtained in H4 fermentation by MFKN2, namely 0,43%, cell dry weight 0,851 grams, glucose content 1,3402%, ph 4,5, temperature 27,1 ⁰C. Meanwile, MFKN1 showed the highest protein content in H6 fermentation, namely 0,38%, cell dry weight 0,817 grams, glucose content 1,3397%, pH 4, temperature 26,2 ⁰C. The yield of glucose and pH tended to decrease as the fermentation process progressed until the last day of fermentation. The results of the temperature analysis tend to be stable as the fermentation process progresses until the last day of fermentation. The conclusion of this study is that pineapple waste can produced single cell protein from Saccharomyces cerevisiae culture and has different protein production with the addition of nutrients in the fermentation medium.