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Wang H, Sun C, Yang S, Ruan Y, Lyu L, Guo X, Wu X, Chen Y. Exploring the impact of initial moisture content on microbial community and flavor generation in Xiaoqu baijiu fermentation. Food Chem X 2023; 20:100981. [PMID: 38144799 PMCID: PMC10740107 DOI: 10.1016/j.fochx.2023.100981] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2023] [Revised: 10/22/2023] [Accepted: 11/06/2023] [Indexed: 12/26/2023] Open
Abstract
Moisture is essential in microbiota succession and flavor formation during baijiu fermentation. However, it remains unknown how moisture content affects microbiota, metabolism, and their relationship. Here, we compared the difference in volatiles, microbiota characteristics, and potential functions with different initial moisture contents (50 %, 55 %, 60 %, 65 %, 70 %). Results showed that the ratio of ethyl acetate to ethyl lactate and total volatile compounds content increased as the moisture content was elevated from 50 % to 70 %. As increasing moisture content, fermentation system microbiota dominated by Lactobacillus was formed more rapidly. Lactobacillus, Dekkera, and Pediococcus were positively correlated with moisture, promoting the production of propanol, acetic acid, butyric acid, and 2-butanol. The complexity and stability of ecological networks enhanced as moisture content increased (R2 = 0.94, P = 0.004). Our study revealed that moisture-drive microbiota was a critical contributor to flavor formation, providing the theoretical basis for moisture control to regulate flavor compounds.
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Affiliation(s)
- Huan Wang
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin Industrial Microbiology Key Laboratory, College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Chunhong Sun
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin Industrial Microbiology Key Laboratory, College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, China
| | | | - Yulei Ruan
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin Industrial Microbiology Key Laboratory, College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Linjie Lyu
- Jing Brand Co., Ltd, HuangShi, HuBei 435100, China
| | - Xuewu Guo
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin Industrial Microbiology Key Laboratory, College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Xiaole Wu
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin Industrial Microbiology Key Laboratory, College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Yefu Chen
- Key Laboratory of Industrial Fermentation Microbiology, Ministry of Education, Tianjin Industrial Microbiology Key Laboratory, College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, China
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Wätjen AP, Øzmerih S, Shetty R, Todorov SK, Huang W, Turner MS, Bang-Berthelsen CH. Utilization of plant derived lactic acid bacteria for efficient bioconversion of brewers' spent grain into acetoin. Int J Food Microbiol 2023; 406:110400. [PMID: 37742345 DOI: 10.1016/j.ijfoodmicro.2023.110400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2023] [Revised: 07/05/2023] [Accepted: 09/13/2023] [Indexed: 09/26/2023]
Abstract
Brewers' spent grain (BSG) is a major side-stream from the beer industry, with an annual estimated production of 39 million tons worldwide. Due to its high nutritional value, high abundance and low price, it has been proposed as an ingredient in human food. Here we investigated the ability of different lactic acid bacteria to produce the flavor molecule acetoin in liquid BSG extract, in order to broaden the possibilities of utilization of BSG in human food. All the investigated lactic acid bacteria (LAB) covering the Leuconostoc, Lactobacillus and Lactoccocus species were able to convert the fermentable sugars in liquid BSG into acetoin. Production levels varied significantly between the different LAB species, with Leuconostoc pseudomesenteroides species reaching the highest titers of acetoin with only acetate as the main byproduct, while also being the fastest consumer of the fermentable sugars present in liquid BSG. Surprisingly, the currently best investigated LAB for acetoin production, L. lactis, was unable to consume the maltose fraction of liquid BSG and was therefore deemed unfit for full conversion of the sugars in BSG into acetoin. The production of acetoin in Leu. pseudomesenteroides was pH dependent as previously observed in other LAB, and the conversion of BSG into acetoin was scalable from shake flasks to 1 L bioreactors. While all investigated LAB species produced acetoin under aerobic conditions, Leu. pseudomesenteroides was found to be an efficient and scalable organism for bioconversion of liquid BSG into a safe acetoin rich food additive.
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Affiliation(s)
- Anders Peter Wätjen
- National Food Institute, Technical University of Denmark, Kgs. Lyngby, Denmark
| | - Süleyman Øzmerih
- National Food Institute, Technical University of Denmark, Kgs. Lyngby, Denmark
| | - Radhakrishna Shetty
- National Food Institute, Technical University of Denmark, Kgs. Lyngby, Denmark
| | | | - Wenkang Huang
- School of Agriculture and Food Sciences, University of Queensland, Brisbane, Queensland, Australia
| | - Mark S Turner
- School of Agriculture and Food Sciences, University of Queensland, Brisbane, Queensland, Australia
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Nguyen HTH, Gomes Reis M, Wa Y, Alfante R, Chanyi RM, Altermann E, Day L. Differences in Aroma Metabolite Profile, Microstructure, and Rheological Properties of Fermented Milk Using Different Cultures. Foods 2023; 12:foods12091875. [PMID: 37174413 PMCID: PMC10178633 DOI: 10.3390/foods12091875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2023] [Revised: 04/24/2023] [Accepted: 04/27/2023] [Indexed: 05/15/2023] Open
Abstract
Texture and flavour are the key attributes determining sensory quality and are highly affected by starter cultures. A selection of phenotypic strains is needed to create diverse texture and flavour to meet consumers' preferences. In this study, the use of five lactic acid bacteria strains in the production of fermented milk, along with the metabolite profiles, microstructure, and rheological properties of the fermented milk samples, was investigated. Our results showed that Lactobacillus helveticus (LH) and Streptococcus thermophilus (ST) had a stronger acidification during fermentation but resulted in products with a coarser protein network compared to Lactococcus lactis (BL1) and Leuconostoc mesenteroides (CL3). Milk fermented by LH had the highest viscosity and exopolysaccharide concentration, while milk fermented by ST had the highest concentration of diacetyl. Although Leuconostoc pseudomesenteroides (CL3ST) had a minimal acidification capability, it produced high levels of ethyl-derived compounds associated with sweet, fruity, and floral fragrances. The results demonstrated that LH and ST could be used as starter cultures targeting fermented milks with different viscosities, while BL1, CL3, and CL3ST are suitable as adjunct cultures to impact different acidic sharpness and flavour notes.
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Affiliation(s)
- Hanh T H Nguyen
- AgResearch Ltd., Te Ohu Rangahau Kai, Palmerston North 4474, New Zealand
| | - Mariza Gomes Reis
- AgResearch Ltd., Te Ohu Rangahau Kai, Palmerston North 4474, New Zealand
| | - Yunchao Wa
- AgResearch Ltd., Te Ohu Rangahau Kai, Palmerston North 4474, New Zealand
- College of Food Science and Engineering, Yangzhou University, Yangzhou 225127, China
| | - Renna Alfante
- AgResearch Ltd., Te Ohu Rangahau Kai, Palmerston North 4474, New Zealand
| | - Ryan M Chanyi
- AgResearch Ltd., Te Ohu Rangahau Kai, Palmerston North 4474, New Zealand
- Riddet Institute, Massey University, Private Bag 11222, Palmerston North 4442, New Zealand
- School of Veterinary Science, Massey University, Palmerston North 4100, New Zealand
| | - Eric Altermann
- AgResearch Ltd., Te Ohu Rangahau Kai, Palmerston North 4474, New Zealand
- Riddet Institute, Massey University, Private Bag 11222, Palmerston North 4442, New Zealand
- School of Veterinary Science, Massey University, Palmerston North 4100, New Zealand
| | - Li Day
- AgResearch Ltd., Te Ohu Rangahau Kai, Palmerston North 4474, New Zealand
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