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1.
Electron. j. biotechnol ; 43: 23-31, Jan. 2020. ilus, graf
Article in English | LILACS | ID: biblio-1087514

ABSTRACT

Background: Hong Qu glutinous rice wine (HQGRW) is brewed under non-aseptic fermentation conditions, so it usually has a relatively high total acid content. The aim of this study was to investigate the dynamics of the bacterial communities and total acid during the fermentation of HQGRW and elucidate the correlation between total acid and bacterial communities. Results: The results showed that the period of rapid acid increase during fermentation occurred at the early stage of fermentation. There was a negative response between total acid increase and the rate of increase in alcohol during the early fermentation stage. Bacterial community analysis using high-throughput sequencing technology was found that the dominant bacterial communities changed during the traditional fermentation of HQGRW. Both principal component analysis (PCA) and hierarchical clustering analysis revealed that there was a great difference between the bacterial communities of Hong Qu starter and those identified during the fermentation process. Furthermore, the key bacteria likely to be associated with total acid were identified by Spearman's correlation analysis. Lactobacillus, unclassified Lactobacillaceae, and Pediococcus were found, which can make significant contributions to the total acid development (| r| N 0.6 with FDR adjusted P b 0.05), establishing that these bacteria can associate closely with the total acid of rice wine. Conclusions: This was the first study to investigate the correlation between bacterial communities and total acid during the fermentation of HQGRW. These findings may be helpful in the development of a set of fermentation techniques for controlling total acid.


Subject(s)
Bacteria/isolation & purification , Wine/microbiology , Pediococcus/isolation & purification , Pediococcus/genetics , Pediococcus/metabolism , Time Factors , Acetobacter/isolation & purification , Acetobacter/genetics , Acetobacter/metabolism , Cluster Analysis , Sequence Analysis , Computational Biology , Principal Component Analysis , Fermentation , Microbiota , Hydrogen-Ion Concentration , Lactobacillus/isolation & purification , Lactobacillus/genetics , Lactobacillus/metabolism
2.
Braz. j. microbiol ; 48(3): 592-601, July-Sept. 2017. tab, graf
Article in English | LILACS | ID: biblio-889150

ABSTRACT

Abstract The aim of this study was to develop a kefir apple-based vinegar and evaluate this fermentation process using new methodology with Biospeckle Laser. Brazilian kefir grains were inoculated in apple must for vinegar production. In this study, the microbial community present in kefir, and correspondent vinegar, was investigated using Matrix Assisted Laser Desorption/Ionization - Time of Flight Mass Spectrometry (MALDI-TOF MS) technique. Saccharomyces cerevisiae, Lactobacillus paracasei, Lactobacillus plantarum, Acetobacter pasteurianus and Acetobacter syzygii were the microbial species identified. S. cerevisiae, L. plantarum, A. pasteurianus and A. syzygii were found in smaller quantities at the beginning of the alcoholic fermentation, but were found throughout the alcoholic and acetic fermentation. Kefir grains were able to utilize apple must as substrate to produce ethanol, and acetic acid. Acetate, volatile alcohols and aldehydes in the vinegar-based kefir were also produced. The yield of acetic acid in the kefir vinegars was ∼79%. The acetic acid concentration was ∼41 g L-1, reaching the required standard for the Brazilian legislation accepts it as vinegar (4.0% acetic acid). Kefir vinegar showed good acceptance in the sensory analysis. The technology proposed here is novel by the application of immobilized-cell biomass (kefir grains) providing a mixed inocula and eliminating the use of centrifuge at the end of the fermentative process. This step will save energy demand and investment. This is the first study to produce apple vinegar using kefir grains.


Subject(s)
Humans , Alcoholic Beverages/microbiology , Kefir/analysis , Malus/microbiology , Acetic Acid/analysis , Acetic Acid/metabolism , Acetobacter/isolation & purification , Acetobacter/metabolism , Biodiversity , Brazil , Ethanol/analysis , Ethanol/metabolism , Fermentation , Food Handling , Kefir/microbiology , Lactobacillus/isolation & purification , Lactobacillus/metabolism , Malus/metabolism , Saccharomyces cerevisiae/isolation & purification , Saccharomyces cerevisiae/metabolism , Taste
3.
Braz. j. microbiol ; 47(2): 452-460, Apr.-June 2016. tab, graf
Article in English | LILACS | ID: lil-780816

ABSTRACT

Abstract A high concentration of histamine, one of the biogenic amines (BAs) usually found in fermented foods, can cause undesirable physiological side effects in sensitive humans. The objective of this study is to isolate indigenous Acetobacter strains from naturally fermented Bokbunja vinegar in Korea with reduced histamine production during starter fermentation. Further, we examined its physiological and biochemical properties, including BA synthesis. The obtained strain MBA-77, identified as Acetobacter aceti by 16S rDNA homology and biochemical analysis and named A. aceti MBA-77. A. aceti MBA-77 showed optimal acidity % production at pH 5; the optimal temperature was 25 °C. When we prepared and examined the BAs synthesis spectrum during the fermentation process, Bokbunja wine fermented with Saccharomyces cerevisiae showed that the histamine concentration increased from 2.72 of Bokbunja extract to 5.29 mg/L and cadaverine and dopamine was decreased to 2.6 and 10.12 mg/L, respectively. Bokbunja vinegar prepared by A. aceti MBA-77 as the starter, the histamine concentration of the vinegar preparation step was decreased up to 3.66 mg/L from 5.29 mg/L in the wine preparation step. To our knowledge, this is the first report to demonstrate acetic acid bacteria isolated from Bokbunja seed vinegar with low spectrum BA and would be useful for wellbeing vinegar preparation.


Subject(s)
Wine/analysis , Biogenic Amines/analysis , Acetobacter/metabolism , Histamine/metabolism , Rubus/microbiology , Saccharomyces cerevisiae/metabolism , Wine/microbiology , Acetobacter/isolation & purification , Acetobacter/genetics , Histamine/analysis , Acetic Acid/analysis , Acetic Acid/metabolism , Fermentation , Rubus/metabolism , Food Microbiology
4.
Rev. homeopatia (Säo Paulo) ; (154): 24-8, jul.-set. 1982. tab
Article in Portuguese | LILACS | ID: lil-114255

ABSTRACT

Os dados obtidos nesta primeira fase dos estudos, sugerem uma acao do medicamento homeopatico na desinibicao de um processo enzimatico bacteriano, com resultados progressivamente melhores conforme subimos nas escalas das potencias ate 30CH. Estes estudos ainda estao em andamento, sendo realizadas no momento novas series de incubacoes com maior numero de frascos, para maior certeza estatistica


Subject(s)
Acetobacter/drug effects , In Vitro Techniques , Natrium Muriaticum , Acetobacter/enzymology , Acetobacter/metabolism , Bacteria/enzymology , Basic Homeopathic Research , Enzyme Reactivators
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