One of the promising methods to improve yeast fermentation performance in high gravity brewing is to increase pitching rate in the bioreactor. In this study, fermentation with four different pitching rates (1.5×107, 4.5×107, 7.5×107, and 10.5×107 viable cells/ml wort) was carried out to investigate the impact of pitching rate on yeast fermentation performance and beer quality from 24oBx wort. T...

In this work, a fibrous bed bioreactor with high specific surface area and good adsorption efficacy for S. cerevisiae cells was used as the immobilization matrix in the production of ethanol. In batch fermentation, an optimal ethanol concentration of 91.36 g/l and productivity of 4.57 g l(-1) h(-1) were obtained at an initial sugar concentration of 200 g/l. The ethanol productivity achieved by ...

A fuzzy-decision-making procedure is applied to find the optimal feed policy of a fed-batch fermentation process for L-lysine production in a stirred tank bioreactor from Brevibacterium flavum 22LD. The policy consists of a feed flow rate, feed concentration of glucose and threonine, and fermentation time. In this paper the fermentation process is formulated as a general multiple objective opti...

The fermentation kinetics of penicillin production by Penicillium chrysogenum was carried out at 27°C and pH 6.0. Batch and repeated batch fermentations using agar-immobilized cells in fluidized bed bioreactor were studied for their potential application in production of penicillin from lactose, a fermentable sugar. Kinetics of immobilized cell fermentation, showed the penicillin yield of ~0.01...

Nowadays, vinegar is industrially produced by mesophilic acetic acid bacteria (AAB). However, temperature fluctuation during acetous fermentation is inevitable, and may cause process disturbances. This can be mostly avoided using thermo-tolerant AAB. The main purpose of the present study was to isolate thermo-tolerant AAB. Fermentation performances were then evaluated. Twenty-eight different is...

BACKGROUND The bacteria Escherichia coli K4 produces a capsular polysaccharide (K4 CPS) whose backbone is similar to the non sulphated chondroitin chain. The chondroitin sulphate is one of the major components of the extra-cellular matrix of the vertebrate connective tissues and a high value molecule, widely employed as active principle in the treatment of osteoarthritis. It is usually obtained...

Hydrogen-producing thermophilic cellulolytic microorganisms were isolated from cow faeces. Rates of cellulose hydrolysis and hydrogen formation were 0.2 mM L(-1) h(-1) and 1 mM L(-1) h(-1), respectively. An enzymatic fuel cell (EFC) with a hydrogenase anode was used to oxidise hydrogen produced in a microbial bioreactor. The hydrogenase electrode was exposed for 38 days (912 h) to a thermophili...

Solid-state fermentation (SSF) of vinegar wastes saves environmental resources and helps to recover valuable material for lignocellulose purposes. The development of solid-state fermentation technology is very important for the production of cellulase and ultimately for utilization of natural cellulose. However, inadequate dissipation of heat generated by biological activities has prevented sol...

Abstract Pyruvic acid is an important organic and a key industrial raw material. It widely used in the chemical, agricultural, food fields. Candida glabrata preferred strain for pyruvic production. The waste yeast cell fermentation with C. are rich protein, amino acid, nucleic vitamins, as potential cost-effective nitrogen source In this study, of to produce using spent dry powder was evaluated...