Penjit Srinophakun

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Ethanol production from sweet sorghum juice by Saccharomyces cerevisiae NP01 was investigated under very high gravity (VHG) fermentation and various carbon adjuncts and nitrogen sources. When sucrose was used as an adjunct, the sweet sorghum juice containing total sugar of 280 g l(-1), 3 g yeast extract l(-1) and 5 g peptone l(-1) gave the maximum ethanol(More)
The production of l-phenylalanine is conventionally carried out by fermentations that use glucose or sucrose as the carbon source. This work reports on the use of glycerol as an inexpensive and abundant sole carbon source for producing l-phenylalanine using the genetically modified bacterium Escherichia coli BL21(DE3). Fermentations were carried out at(More)
BACKGROUND: An inexpensive and readily available agroindustrial substrate such as rice bran can be used to produce cheap commercial enzymes by solid-state fermentation. This work investigates the production of food-grade proteases by solid-state fermentation using readily available Thai rice bran. RESULTS: A local strain of Aspergillus oryzae (Ozykat-1) was(More)
Production of xylitol from xylose in batch fermentations of Candida mogii ATCC 18364 is discussed in the presence of glucose as the cosubstrate. Various initial ratios of glucose and xylose concentrations are assessed for their impact on yield and rate of production of xylitol. Supplementation with glucose at the beginning of the fermentation increased the(More)
The aims of this study were to develop the kinetic model and determine kinetic parameters describing ethanol production from sweet sorghum juice using very high gravity technology in the batch fermentation of Saccharomyces cerevisiae NP01. The obtained experimental data were tested with four different types of model, based on the experimental data,(More)
L-phenylalanine was produced by genetically modified bacterium, Escherichia coli BL21(DE3), using glycerol as an alternative carbon source. Response surface methodology (RSM) involving central composite design (CCD) was adopted to evaluate the amount of L-phenylalanine produced. In this work, the optimum concentrations were determined of the major nutrients(More)
This article proposes a controller design method for the continuous stirred-tank reactor (CSTR) in the biodiesel process. First, the dynamics model of the reactor in the biodiesel continuous process is presented. Then, a controller design method, using both input-output linearization method and PD method, is presented to control the concentration of the(More)
The purpose of this research is to use the fuzzy PD control technique in order to achieve automatic control for a packed-bed reactor in the solid-state fermentation. The lump mathematical model of Koji process is employed in the development of the fuzzy PD controller. Koji process is done by fermenting 4 kilograms of wet soybeans with 200 grams of rice(More)
Production of carotenoids by Rhodococcus opacus PD630 is reported. A modified mineral salt medium formulated with glycerol as an inexpensive carbon source was used for the fermentation. Ammonium acetate was the nitrogen source. A dry cell mass concentration of nearly 5.4 g/L could be produced in shake flasks with a carotenoid concentration of 0.54 mg/L. In(More)