Optimization of acid hydrolysis conditions for feruloylated oligosaccharides from rice bran through response surface methodolgy.

Response surface methodology (RSM) was employed to optimize the hydrolysis conditions with trifluoroacetic acid (TFA) to obtain the maximum amount of feruloylated oligosaccharides from rice bran. The TFA concentration and hydrolysis time effects on feruloylated oligosaccharides recovery are studied. The optimum hydrolysis conditions for maximizing feruloylated oligosaccharides recovery were 193 mM TFA concentration and 1.

Water Activity Relationships for Selected Mesophiles and Psychrotrophs at Refrigeration Temperature.

The growth rate and lag phase of Pseudomonas fluorescens , Brochothrix thermosphacta , Salmonella typhlmurium , Enterococcus faecalis , and Staphylococcus aureus were studied in liquid media as a function of temperature, water activity (a) and solute type. The lag phase lengthened and the growth rate decreased when the temperature was lowered or the a reduced, and these variations depended on the a-controlling solute. In general, the magnitude order of the solute effect on the growth rate parameters was glycerol < NaCl < sucrose.