共查询到20条相似文献,搜索用时 31 毫秒
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Summary A new sauerkraut fermentation vat with external recycling of brine is described. This system allows the control of fermentation, improves the homogeneity of final product and accelerates theacidification by the usual lactic-acid bacteria. 相似文献
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Kocho fermentation 总被引:1,自引:0,他引:1
B. A. Gashe 《Journal of applied microbiology》1987,62(6):473-477
Kocho, an acidic starchy food, is prepared by fermenting a mixture of the scraping of the trunk and pulverized stem and corm of ensette ( Ensette ventricosum). Leuconostoc mesenteroides is responsible for initiating the fermentation. Because of the activities of this species and, to some extent, of Streptococcus faecalis , the pH of the fermenting kocho was reduced from 6˙5 to 5˙6. These organisms were then succeeded by the homofermentative bacteria Lactobacillus coryneformis subsp. coryne-formis and Lact. plantarum . Through the activities of the Lactobacillus species, the pH was further reduced to 4˙2. Pediococcus cerevisiae , although present in kocho, did not achieve prominence because of the relatively low fermentation temperature (14°-18°C). Spore-formers were present in fairly high numbers during the first 15 d of fermentation. It was suspected that the butyrous odour which was detected during the first 2 weeks in fermenting kocho might be due to the activities of certain clostridial species. Yeasts were also present in fairly high numbers. 相似文献
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Miso is a fermented food widely consumed in the Orient and is prepared from mold rice, soybeans and salt. About 13 million bushels of soybeans are made into miso each year, the annualproduction amounting to 974,000 metric tons. 相似文献
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《Biochemical Engineering Journal》2003,13(2-3):81-84
Solid-state fermentation has emerged as a potential technology for the production of microbial products such as feed, fuel, food, industrial chemicals and pharmaceutical products. Its application in bioprocesses such as bioleaching, biobeneficiation, bioremediation, biopulping, etc. has offered several advantages. Utilisation of agro-industrial residues as substrates in SSF processes provides an alternative avenue and value-addition to these otherwise under- or non-utilised residues. Today with better understanding of biochemical engineering aspects, particularly on mathematical modelling and design of bioreactors (fermenters), it is possible to scale up SSF processes and some designs have been developed for commercialisation. It is hoped that with continuity in current trends, SSF technology would be well developed at par with submerged fermentation technology in times to come. 相似文献
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Peters D 《Biotechnology journal》2006,1(7-8):806-814
Biomass accumulated by the photosynthetic fixation of carbon dioxide is the only renewable carbon source, and hence, the only renewable raw material for the chemical industry. Carbohydrates are the main constituents of biomass and occur as cell wall and storage carbohydrates, transportation carbohydrates and glycoconjugates. Cellulose, hemicelluloses and starch in particular as well as pectin, inulin and saccharose to a smaller extent are the most abundant carbohydrates. Glucose is the most important monosaccharide and monomer of polysaccharides in natural carbohydrates. Thus, it is the most abundant organic compound on earth. Production of pulp from wood cellulose, applications of starch for paper making as well as uses of glucose and saccharose for fermentation are the most important chemical and technical uses of carbohydrates. Carbohydrates used as fermentation feedstock are essential for the chemical industry. Their importance is steadily growing due to the increasing implementation of biotechnological processes. 相似文献
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《Trends in biotechnology》1988,6(6):126-130
Fermentation with simultaneous extraction of a product inside the fermentor is an attractive alternative where substrates and/or products otherwise inhibit processes. Although a large number of systems are being tested, the selection of solvent and the technology and design of the process have nevertheless to be improved. 相似文献
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《Applied microbiology》1972,24(3):524
[This corrects the article on p. 976 in vol. 23.][This corrects the article on p. 977 in vol. 23.][This corrects the article on p. 978 in vol. 23.]. 相似文献
10.
Takeshi Takahashi 《Biotechnology and bioengineering》1969,11(6):1157-1171
A brief review of the development of the research on erythorbic acid fermentation was presented. A previously proposed scheme of the acid biosynthesis has been proved to be correct. D-glucono-γ-lactone dehydrogenase was purified to 50 fold and compared with other lactone dehydrogenases. For the purpose of commercial development, screening and mutagenie treatments of strains and studies on fundamental cultural conditions were carried out. Penicillium, but no other genera, was obtained as a producer. The experiments of ultraviolet irradiation and various cultural conditions were successful in elevating the yield of the acid over 40% in jar-fermentor to glucose supplied. The continuous multibed extraction system of anion-exchange resin was developed and a yield of 19.2% of the acid from fermentation broth was obtained. 相似文献
11.
Applied acetone-butanol fermentation 总被引:1,自引:0,他引:1
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The technology of coupling ultrafiltration and fermentation has been tested with the acetonobutylic fermentation in continuous mode. The device developed was sterilizable by steam and permitted drastic cleaning of the ultrafiltration (UF) membrane without interrupting the continuous fermentation. It has been shown to be an easily operated and reliable experimental tool for studying high-cell-density cultures and inhibition phenomena. With total recycle of biomass, a dry weight concentration of 125 g/L was attained, which greatly enhanced the volumetric solvent productivity of acetonobutylic fermentation in averaging 4. 5 g/L h for significant periods of time (>70 h) and maintaining solvent concentration and yield at acceptable levels. 相似文献
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S. George V. Raju T. V. Subramanian K. Jayaraman 《Bioprocess and biosystems engineering》1997,16(6):381-382
Attempts have been made to compare solid substrate fermentation (SSF) with submerged fermentation for the production of proteases by Bacillus amyloliquefaciens. In submerged fermentation it produced 800,000 units of enzyme under optimal conditions in a 20-litre fermentor whereas in solid substrate, it produced 250,000 units/g. Owing to the simplicity and easiness of operation of SSF and for applications like unhairing, biodetergents and bating the former would be advantageous for the production of proteases. 相似文献
18.
Solid-state fermentation systems-an overview 总被引:7,自引:0,他引:7
Krishna C 《Critical reviews in biotechnology》2005,25(1-2):1-30
Starting with a brief history of solid-state fermentation (SSF), major aspects of SSF are reviewed, which include factors affecting SSF, biomass, fermentors, modeling, industrial microbial enzymes, organic acids, secondary metabolites, and bioremediation. Physico-chemical and environmental factors such as inoculum type, moisture and water activity, pH, temperature, substrate, particle size, aeration and agitation, nutritional factors, and oxygen and carbon dioxide affecting SSF are reviewed. The advantages of SSF over Submerged Fermentation (SmF) are indicated, and the different types of fermentors used in SSF described. The economic feasibilities of adopting SSF technology in the commercial production of industrial enzymes such as amylases, cellulases, xylanase, proteases, phytases, lipases, etc., organic acids such as citric acid and lactic acid, and secondary metabolites such as gibberellic acid, ergot alkaloids, and antibiotics such as penicillin, cyclosporin, cephamycin and tetracyclines are highlighted. The relevance of applying SSF technology in the production of mycotoxins, biofuels, and biocontrol agents is discussed, and the need for adopting SSF technology in bioremediation of toxic compounds, biological detoxication of agro-industrial residues, and biotransformation of agro-products and residues is emphasized. 相似文献
19.
Fed-batch versus batch fermentation 总被引:1,自引:0,他引:1
G. P. Longobardi 《Bioprocess and biosystems engineering》1994,10(5-6):185-194
This article concerns the comparison between batch and fed-batch fermentation based on productivity and including the analysis of the implications on product manufacturing cost. The calculation method of productivity is based on the assumption that batch production rate data are applicable to fed-batch fermentation and that, within a certain range of concentrations, the percent rate of change of batch production rate with respect to time is proportional to the difference of product concentration at maximum production rate minus instant concentration. General correlations are developed and plotted in diagrams for easy practical application of the proposed method of calculation. Correlations so established may find application to design and to planning and control of operating conditions of fermentation plants. Example calculations refer to penicillin G production. 相似文献
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Acidogenic fermentation of lactose 总被引:5,自引:0,他引:5
Cheese whey is the main component of waste streams from cheese manufacturing plants. Whey is a high biochemical oxygen demand (BOD) effluent that must be reduced before the streams are sent to the sewer. It is proposed in this article that the production of methane by anaerobic fermentation would be the best use of this stream, especially for small plants. Single-stage fermentation of lactose, the main component of whey, results in a very low pH and a stalled process. Two-phase fermentation will eliminate this problem. The acidogenic stage of fermentation has been studied at pH of between 4 and 6.5. The nature of the main products of the reaction have been found to be pH dependent. Below a pH of 4.5 a gas (CO(2) and H(2)) is produced along with ethanol, acetate, and butyrate. Above a pH of 4.5 no gas was produced, and the liquid products included less ethanol and butyrate and more acetate. A separate study on the conditions for gas formation showed that if the pH dropped for a short time below 4.5 gases were formed at all subsequent pH. This would indicate a change in population distribution due to the period at a low pH. By assuming that the desired products from the acidogenic stage were butyrate, acetate, and no gases, the optimum pH range was found to be between 6.0 and 6.5. 相似文献