Thesis--PlanA (M.S.)--University of Wisconsin--Stout, 2000. / Includes bibliographical references.

The conversion of soybeans to tempe is achieved through fermentation by Rhizopus. This fermentation process leads to hydrolysis of both proteins and lipids. The present work investigated certain biochemical changes which accompany the conversion of soybeans to tempe. The contents of non-protein nitrogen and free $ alpha$-amino nitrogen increased from 2.34 to 15.14%, and 2.03 to 5.22%, respectively after 48 h fermentation. SDS electrophoresis showed that a substantial quantity of the proteins in raw soybeans were hydrolysed by the Rhizopus to low molecular species (molecular weight $<$13,000 Daltons). Trypsin inhibitor activity found in tempe was lower than that of soybean and soaked soybean (an intermediate step in tempe preparation). The protein digestibilities of tempe and soaked soybean were higher than that of soybean. Reversed phase HPLC showed that the peptide separation profile of tempe was different from that of soybean and soaked soybean. The ESI/MS of the RP-HPLC fractions gave molecular weight of soybean peptides ranging from 1962 Da to 22,699 Da and tempe peptides ranging from 569 Da to 16,688 Da. The fatty acid compositions of tempe, soybean and soaked soybean were similar; relatively high levels of linoleic acid followed by oleic, linolenic and stearic acids were found. The acid values increased from 1.49 to 11.42 during the fermentation of soybeans. The total soluble carbohydrate contents of soybean, tempe and soaked soybean as well as the types and quantities of individual sugars were similar. The fermentation of soybean by Rhizopus had only a minor effect on the proximate composition of soybean; however, the soybean and fungal enzymes contributed primarily to changes in protein composition.

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Thesis (doctoral)--Swedish University of Agricultural Sciences, 2006. / Includes bibliographical references. Also available on the World Wide Web in PDF format.

Plant-based proteins have gained popularity because of their high nutritional value and more sustainable alternative to animal-based proteins. Soybean and chickpea are two widely consumed plant-based proteins, whereas tempeh is a popular plant-based fermented whole food product that is rich in protein. With the increase in the development of plant-based food products, there is little research into how plant proteins affect gut microbiota characteristics and metabolites. Therefore, there is a need to understand the underlying mechanisms surrounding the consumption of these foods. The purpose of this study was to investigate the health benefits of soybean, chickpea, and their tempeh counterparts’ consumption as whole foods on the gut microbiota and metabolites. Our results showed that soybean tempeh significantly increased the abundance of beneficial probiotic bacteria such as Roseburia and Ruminiclostridium 5 in the gut microbiota of mice. Additionally, soybean tempeh and soybean significantly increased Muribaculaeceae abundance, known to increase SCFA production in the colon. Lachnospiraceae NKA136 was significantly increased in soybean tempeh, soybean, and chickpea groups which may allow these foods to be used as a way of probiotic restoration. Our results showed that all dietary supplementation groups had significantly altered metabolic profiles compared to the control group. The soybean tempeh group had higher levels of peroxide (vitamin B6), myoinositol, and tetrahydrobiopterin while the chickpea tempeh group had higher levels of metabolites such as 3 hydroxyanthranilic acid. The soybean group had higher levels of metabolites such as 3-hydroxytryptophan (Oxitriptan) whereas the chickpea protein group had higher levels of metabolites such as 3-hydroxyanthranilic acid and oxitriptan. In conclusion, our study suggests that different plant-based foods can have distinct effects on gut microbiota and metabolic profiles in mice. These findings may have implications for human health and warrant further investigation into the effects of plant protein consumption on human metabolism.

Tempeh belongs to the fermented probiotic soybean products. Tempeh is a valuable nutritional foodstuff due to its rich source of protein, content of unsaturated fatty acids essential for human and high amount of antioxidants. The theoretical part describes nutritional composition of tempeh and soybeans. In the thesis are discussed positive and negative effects of soy on human health. In the thesis were followed up changes in the nutritional components caused by the fermentation process and the action of microorganisms. The experimental part deals with the identification of microorganisms, which are contained in three types of tempeh. Microorganisms were detected using method polymerase chain reaction. DNA was isolated from the products by use phenol extraction, using magnetic microparticles F-kol 77ox and magnetic nanoparticles F79/L3 PLL. As part of the nutritional analysis changes in individual nutrients and other substances in soybeans after tempeh fermentation have been studied. In the chosen products total content of essential nutrients – carbohydrates, lipids and proteins were analyzed. Amount of antioxidants such as phenolics and flavonoids were analysed by UV-VIS spectrophotometry. Determination of vitamin E content which was analysed by HPLC and determination presence of fatty acids which was determined by GC was incorporated to this thesis.

The circular economy is about rethinking the definition of waste into resource. Tempeh boiling water is cheap and would otherwise be washed into the river and pollute the water which would affect the environment badly. Tempeh boiling water is going to be used as substrate to produce mycoprotein with the fungi Rhizopus oligosporus. This study is about making a mycoprotein nugget and evaluate it with a sensory evaluation and to evaluate the protein content in the nugget and chemical oxygen demand of the boiling water. The sensory evaluation will have 65 panellists to assess the liking of the nugget with two control samples. The purpose of this project was to evaluate the potential of tempeh boiling water for the circular economy as substrate. To produce high mycoprotein nugget that will be accepted by the community. Assess the protein content in the mycoprotein nugget and assess the carbon used by the fungi with chemical oxygen demand analyse. The target group for evaluating the fungal nugget was students studying at Gadjah Mada University, Yogyakarta, Indonesia. The project was done in multiple following stages: Finding best formula of mycoprotein, mycoprotein production, sensory evaluation, and protein analyse with Kjeldahl method and COD analyse of the boiling water.The result of this study is that the mycoprotein nugget were not liked nor disliked with the average score of 3,9 out of 7. The overall characteristics (appearance, colour, texture, and taste) were 4,0 out of 7. The COD before and after fermentation were 6,6 g/L. The most COD were removed by pre-treatment of the boiling water from 172 to 121 g/L.The protein content of the mycoprotein nugget were 23,8%. The social aspect to produce healthy foods to a low cost at the same time improve water quality by removing foods for toxic microorganisms.

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