36results about How to "Increase the rate of acid production" patented technology

The invention discloses a method for producing table vinegar by adopting a two-step acetic acid fermentation method and belongs to the technical field of brewing of the table vinegar. According to the method, the problems of low alcohol intolerance, long fermentation period and low acetification rate for acetic acid fermentation in a traditional method are solved. The method comprises the following steps of: uniformly stirring sorghum flour, corn flour, rice meal and water; adding thermostable alpha amylase for liquefying; after liquefying, reducing the temperature, adding Daqu, saccharifying koji, red starter, saccharomyces cerevisiae and aroma-producing yeast and carrying out alcoholic fermentation to obtain liquor; adopting the two-step acetic acid fermentation method: firstly, mixing the liquor; adding acetic acid bacteria subjected to liquid amplification culture for carrying out primary acetic acid fermentation; when the alcoholic strength of brewing mass is reduced to 6-5DEG C, adding wheat bran and rice husk as accessories for mixing; inoculating fire fermented liquor for carrying out secondary acetic acid fermentation; sealing the liquor; smoking the liquor; spraying vinegar; filtering; and packaging to obtain a finished product. According to the method disclosed by the invention, the high-content alcohol can be effectively converted; the acid yield and the acetification rate in unit time are improved; and the flavor of the table vinegar produced by adopting a traditional solid acetic acid fermentation method is ensured.

The invention discloses a fermenting type apple vinegar beverage and a preparation method thereof. The fermenting type apple vinegar beverage is characterized by being prepared by preparing, filtering, sterilizing and filling the following raw materials by weight proportion: 50-70 parts of apple vinegar, 80-120 parts of concentrated apple juice, 2-8 parts of honey, 1-3 parts of aspartame and 799-867 parts of water. The fermenting type apple vinegar beverage has the advantages of well retaining the original nutrient substances and flavor of apple, having high acid production rate, being obviously shortened in fermenting time, further being capable of separating cured acetic bacteria cells and products easily and being used repeatedly, enabling strains to be efficient, greatly improving production efficiency, saving production cost and reducing pollution discharging.

The present invention provides a kind of Lactobacillus plantarum with fast acid production and high acid production and application thereof, which is Lactobacillus plantarum ( Lactobacillus plantarum ) WG03, the preservation unit is China General Microorganism Culture Collection Management Center, the preservation number is CGMCC 20876, and the preservation date is October 12, 2020. The present invention provides a microbial inoculum comprising the above-mentioned Lactobacillus plantarum. The above-mentioned Lactobacillus plantarum or bacterial agent can be applied to the fermentation of silage. In the present invention, a strain of Lactobacillus plantarum with fast acid production and high acid production is obtained by protoplast fusion technology combined with traditional mutagenesis. Using this strain as a silage additive can well inhibit the growth of spoilage bacteria and quickly start Anaerobic fermentation process to improve the quality of silage.

The invention relates to a method for producing a short-chain fatty acid employing combined pretreatment of activated sludge. The method comprises the following steps: (1) carrying out gamma-ray irradiation on activated sludge, so as to prepare gamma-ray irradiated sludge; (2) carrying out ultrasonic treatment on the gamma-ray irradiated sludge, so as to prepare ultrasonic-treated sludge; and (3) adjusting the pH value of ultrasonic-treated sludge, carrying out anaerobic fermentation, so as to prepare the combined pretreated activated sludge. After the activated sludge is subjected to gamma-ray irradiation and ultrasonic treatment, organic matters such as protein and polysaccharide in the sludge dissolved into water can be significantly improved, so that an abundant organic matrix which can be dissolved into water is provided for fermentation and acidogenesis of sludge; the acid production rate of the sludge is improved; the anaerobic fermentation time of the sludge is shortened; and the method has important significance in improvement and optimization of an existing sludge treatment system, energy conservation and consumption reduction, and reduction of the operation cost.

The invention relates to a genetically engineered bacterium for producing alpha-ketobutyric acid as well as a construction method and application of the genetically engineered bacterium, belonging to the technical field of biology. The strain is relatively high in production efficiency when used for producing alpha-ketobutyric acid through fermentation. The genetically engineered bacterium is obtained through carrying out genetic engineering modification on Escherichia coli MG1655; the genetic engineering modification is realized by knocking out a large-subunit encoding gene ilvB of acetohydroxyacid synthase I, a large-subunit encoding gene ilvI of acetohydroxyacid synthase III and a threonine operon leading peptide encoding gene thrL in an over-expressive threonine dehydratase encoding gene ilvA. When the bacterium is used for producing alpha-ketobutyric acid by using a fermentation method, defects such as complex reaction conditions, high energy consumption, serious pollution or high production cost, serious pollution and the like existing in a chemical synthesis method, an enzyme method or a microbial conversion method can be overcome; after the bacterium is fermented for 20-24h, the yield of alpha-ketobutyric acid is up to 8.5-15.7g / L; aerobic fermentation is adopted in a fermentation process; the bacterium is rapid in growth, short in fermentation period and high in acid production rate; any reports for producing alpha-ketobutyric acid by using a direct fermentation method are not found at present.

The invention discloses a method for continuous cultivation of Aspergillus niger seeds. The method comprises the following steps: (1) in the start-up stage, inoculating the Aspergillus niger spores into the seed medium to obtain a seed liquid; (2) in the continuous cultivation stage of the seeds, The seed solution obtained in step (1) is subjected to continuous dispersion treatment, and the seed solution obtained by dispersing is continuously cultivated, and fresh seed feed medium is supplemented at the same time; (3) stop stage, stop supplementing fresh seed feed medium and disperse treatment, Continue culturing to obtain seed liquid, which is transferred into the fermentation medium for fermentation and cultivation. The method of the present invention solves the problem of slow growth of multicellular filamentous bacteria and easy loss of mycelium balls in continuous culture, completely realizes the continuous cultivation of seeds, keeps the bacteria in the most suitable growth environment, and avoids the Seed degradation, so that the seed liquid is in a continuous and stable high-activity state, corresponding to the improvement of the performance of citric acid production by fermentation.