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Chua JY, Huang A, Liu SQ. Comparing the effects of isoleucine and leucine supplementation at different dosage on the growth and metabolism of Torulaspora delbrueckii Biodiva during soy whey fermentation. FOOD BIOSCI 2022. [DOI: 10.1016/j.fbio.2022.101963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Zhou RY, Huang X, Liu Z, Chua JY, Liu SQ. Evaluating the effect of lactic acid bacterial fermentation on salted soy whey for development of a potential novel soy sauce-like condiment. Curr Res Food Sci 2022; 5:1826-1836. [PMID: 36276244 PMCID: PMC9579447 DOI: 10.1016/j.crfs.2022.10.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2022] [Revised: 09/29/2022] [Accepted: 10/05/2022] [Indexed: 11/07/2022] Open
Abstract
There were two main objectives of this study: (1) to understand the effect of salt concentration on the growth of four lactic acid bacteria (LAB) in soy whey and determine the non-volatile and volatile profiles generated after fermentation; (2) to evaluate the potential of using salted soy whey to develop a sauce-like condiment through LAB fermentation. The four LAB included non-halophilic Lactiplantibacillus plantarum ML Prime, Limosilactobacillus fermentum PCC, Oenococcus oeni Enoferm Beta and halophilic Tetragenococcus halophilus DSM20337. At 2% salt, all LAB grew remarkably from day 0 to day 1, except for T. halophilus, while at 6% salt, the growth of L. plantarum, L. fermentum and O. oeni was suppressed. Conversely, the higher salt concentration enhanced the growth of T. halophilus in soy whey as the cell count only increased from 6.36 to 6.60 log CFU/mL at 2% salt but it elevated from 6.61 to 7.55 log CFU/mL at 6% salt. Similarly, the higher salt content negatively affected the sugar and amino acids metabolism and organic acids production by non-halophilic LAB. L. plantarum and O. oeni generated significantly (p < 0.05) more lactic acid (3.83 g/L and 4.17 g/L, respectively) than L. fermentum and T. halophilus (2.02 g/L and 0 g/L, respectively) at 2% salt. In contrast, a higher amount of acetic acid was generated by L. fermentum (0.72 g/L at 2% salt) and T. halophilus (0.51 g/L at 6% salt). LAB could remove the green and beany off-flavours in soy whey by metabolizing C6 and C7 aldehydes. However, to develop a novel soy sauce-like condiment, yeast fermentation and Maillard reaction may be required to generate more characteristic soy sauce-associated aroma compounds. Soy whey with 2% and 6% NaCl supported the growth of lactic acid bacteria (LAB). At 6% NaCl, T. halophilus grew better while the growth of other LAB was impeded. T. halophilus and L. fermentum produced significant amounts of acetic acid. Through LAB fermentation, green and beany off-odour of soy whey could be removed. Yeast fermentation and heating are required to produce key aroma soy sauce compounds.
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Affiliation(s)
- Rebecca Yinglan Zhou
- Department of Food Science and Technology, National University of Singapore, 2 Science Drive 2, 117542, Singapore
| | - Xin Huang
- Department of Food Science and Technology, National University of Singapore, 2 Science Drive 2, 117542, Singapore
| | - Zhihao Liu
- Department of Food Science and Technology, National University of Singapore, 2 Science Drive 2, 117542, Singapore
| | - Jian-Yong Chua
- Department of Food Science and Technology, National University of Singapore, 2 Science Drive 2, 117542, Singapore,Corresponding author. Department of Food Science and Technology, National University of Singapore, 2 Science Drive 2, 117542, Singapore.
| | - Shao-Quan Liu
- Department of Food Science and Technology, National University of Singapore, 2 Science Drive 2, 117542, Singapore,National University of Singapore (Suzhou) Research Institute, 377 Lin Quan Street, Suzhou Industrial Park, Jiangsu, 215213, China,Corresponding author. Department of Food Science and Technology, National University of Singapore, 2 Science Drive 2, 117542, Singapore.
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Fenner ED, Scapini T, da Costa Diniz M, Giehl A, Treichel H, Álvarez-Pérez S, Alves SL. Nature's Most Fruitful Threesome: The Relationship between Yeasts, Insects, and Angiosperms. J Fungi (Basel) 2022; 8:984. [PMID: 36294549 PMCID: PMC9605484 DOI: 10.3390/jof8100984] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2022] [Revised: 09/13/2022] [Accepted: 09/18/2022] [Indexed: 07/30/2023] Open
Abstract
The importance of insects for angiosperm pollination is widely recognized. In fact, approximately 90% of all plant species benefit from animal-mediated pollination. However, only recently, a third part player in this story has been properly acknowledged. Microorganisms inhabiting floral nectar, among which yeasts have a prominent role, can ferment glucose, fructose, sucrose, and/or other carbon sources in this habitat. As a result of their metabolism, nectar yeasts produce diverse volatile organic compounds (VOCs) and other valuable metabolites. Notably, some VOCs of yeast origin can influence insects' foraging behavior, e.g., by attracting them to flowers (although repelling effects have also been reported). Moreover, when insects feed on nectar, they also ingest yeast cells, which provide them with nutrients and protect them from pathogenic microorganisms. In return, insects serve yeasts as transportation and a safer habitat during winter when floral nectar is absent. From the plant's point of view, the result is flowers being pollinated. From humanity's perspective, this ecological relationship may also be highly profitable. Therefore, prospecting nectar-inhabiting yeasts for VOC production is of major biotechnological interest. Substances such as acetaldehyde, ethyl acetate, ethyl butyrate, and isobutanol have been reported in yeast volatomes, and they account for a global market of approximately USD 15 billion. In this scenario, the present review addresses the ecological, environmental, and biotechnological outlooks of this three-party mutualism, aiming to encourage researchers worldwide to dig into this field.
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Affiliation(s)
- Eduardo D. Fenner
- Graduate Program in Environment and Sustainable Technologies, Federal University of Fronteira Sul, Campus Cerro Largo, Cerro Largo 97900-000, RS, Brazil
- Laboratory of Yeast Biochemistry, Federal University of Fronteira Sul, Campus Chapecó, Chapecó 89815-899, SC, Brazil
| | - Thamarys Scapini
- Laboratory of Microbiology and Bioprocesses, Federal University of Fronteira Sul, Campus Erechim, Erechim 99700-970, RS, Brazil
| | - Mariana da Costa Diniz
- Laboratory of Yeast Biochemistry, Federal University of Fronteira Sul, Campus Chapecó, Chapecó 89815-899, SC, Brazil
| | - Anderson Giehl
- Laboratory of Yeast Biochemistry, Federal University of Fronteira Sul, Campus Chapecó, Chapecó 89815-899, SC, Brazil
| | - Helen Treichel
- Laboratory of Microbiology and Bioprocesses, Federal University of Fronteira Sul, Campus Erechim, Erechim 99700-970, RS, Brazil
| | - Sergio Álvarez-Pérez
- Department of Animal Health, Faculty of Veterinary Medicine, Complutense University of Madrid, 28040 Madrid, Spain
| | - Sérgio L. Alves
- Graduate Program in Environment and Sustainable Technologies, Federal University of Fronteira Sul, Campus Cerro Largo, Cerro Largo 97900-000, RS, Brazil
- Laboratory of Yeast Biochemistry, Federal University of Fronteira Sul, Campus Chapecó, Chapecó 89815-899, SC, Brazil
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The impact of mixed amino acids supplementation on Torulaspora delbrueckii growth and volatile compound modulation in soy whey alcohol fermentation. Food Res Int 2020; 140:109901. [PMID: 33648203 DOI: 10.1016/j.foodres.2020.109901] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Revised: 11/04/2020] [Accepted: 11/05/2020] [Indexed: 01/19/2023]
Abstract
Soy (tofu) whey is a liquid side stream generated from tofu production and is often discarded as waste after it is generated. Direct disposal of soy whey can result in environmental issue in the long run. Soy whey has been previously successfully fermented using different types of wine yeasts, but the yeast available nitrogen (YAN) was found to be deficient. In this study, the soy whey YAN was estimated to be approximately 45.9 mg N/L. A mixture of four amino acids (valine, leucine, isoleucine and phenylalanine) was added into soy whey at a total concentration of +40, +80, +120 and +160 mg N/L and fermented with Torulaspora delbrueckii Biodiva for a period of 10 days. Increasing amino acid supplementation did not affect the yeast cell growth, but it sped up the sugar utilization proportionally. Increasing amino acid supplementation resulted in lower organic acid production and higher glycerol production. Amino acid supplementation also enhances the production rate of higher alcohols; increasing amount of higher alcohols and their respective esters were obtained with increasing amount of amino acid supplementation. However, higher levels of amino acid supplementation (particularly at +160 mg N/L sample) resulted in higher residual nitrogen contents which may lead to microbial instability. Supplementation of 120 mg N/L of amino acids was found to be the optimum concentration to enhance the metabolism of the yeast without leaving a high residual amino acid content. Therefore, with proper control of the amino acid addition dosage, the usage of mixed amino acid supplementation may be a strategy to regulate the fermentation kinetics and volatile compound modulation in soy whey alcohol fermentation.
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