Optimizing bacterial cellulose production from red guava kombucha by-products: a box-behnken design approach
摘要
Bacterial cellulose from SCOBY (BCS) is an extracellular polysaccharide biopolymer produced by microbial fermentation. This study explores BCS production from the by-product of red guava kombucha fermentation. The process yields cellulose membranes that float on the surface, requiring optimization to maximize biosynthesis. Response Surface Methodology (RSM) with Box-Behnken Design (BBD) was applied to enhance production by modifying media composition with key nutrients. The study optimized three parameters: Monosodium glutamate (MSG) (A), citric acid (B), and ethanol (C). The best formulation consisted of 0.100% MSG, 0.150% citric acid, and 0.920% ethanol. The RSM model predicted a BCS yield of 175.40 g/L (wet weight), with a thickness of 0.55 mm, pH 2.755, dissolved protein 1.343 mg/mL, and total reducing sugar of 1516.29 mg/L. Experimental results obtained a yield of 164.83 g/L, thickness of 0.50 mm, pH 2.825, dissolved protein 1.32 mg/mL, and total reducing sugar of 1386.67 mg/L. This study demonstrates the potential of BCS from red guava kombucha for commercial applications. The RSM approach effectively optimized production, showing strong parameter interactions that enhance cellulose yield, making it a promising raw material source.