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A systematic study was made of the gelation of low methoxyl pectin (LMP) using mathematical models of the effects of pH, and Ca2+, sucrose, and pectin concentrations. When [Ca2+] was 16–88 mg/g, the mathematical model of gel strength (analyzed by texture analyzer) applied a DoseResp function, which showed a trend similar to that of a microbial growth curve. The function between gel strength and pH...
Objective To study the effect of Ca2+ on glutamate dehydrogenase (GDH) and its role in poly-γ-glutamic acid (γ-PGA) synthesis in Bacillus natto HSF 1410. Results When the concentration of Ca2+ varied from 0 to 0.1 g/l in the growth medium of B. natto HSF 1410, γ-PGA production increased from 6.8 to 9.7 g/l, while GDH specific activity and NH4Cl consumption improved from 183 to 295 U/mg and from...
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