Corncob hydrolysate, an efficient substrate for Monascus pigment production through submerged fermentation.

Area of Science:

• Biotechnology
• Food Science
• Microbial Fermentation

Background:

• Monascus pigment production traditionally uses rice or glucose substrates.
• Submerged fermentation offers stable yields and better control over citrinin byproduct.
• Reducing fermentation costs is crucial for industrial application.

Purpose of the Study:

• To investigate corncob hydrolysate as a cost-effective substrate for Monascus submerged fermentation.
• To optimize conditions for enhanced pigment production and reduced citrinin accumulation.
• To compare corncob hydrolysate performance against conventional glucose medium.

Main Methods:

• Utilized corncob hydrolysate as a fermentation substrate for Monascus.
• Optimized cultivation conditions including dark incubation and caprylic acid addition.
• Quantified Monascus pigment yield (UA500/mL) and citrinin levels (µg/L).

Main Results:

• Corncob hydrolysate achieved pigment yields comparable to glucose medium (25.8 UA500/mL vs. 24.0 UA500/mL).
• Optimized conditions significantly reduced citrinin accumulation (26.2 µg/L) compared to glucose (44.3 µg/L).
• Corncob hydrolysate demonstrated superior performance over glucose in terms of yield and byproduct control.

Conclusions:

• Corncob hydrolysate is a viable and cost-effective alternative substrate for Monascus pigment production.
• Optimized submerged fermentation using corncob hydrolysate enhances pigment yield and minimizes citrinin.
• This method presents significant advantages over conventional glucose-based fermentation.