Chitin extraction from Allopetrolisthes punctatus crab using lactic fermentation

Area of Science:

• Marine Biology
• Biotechnology
• Biochemistry

Background:

• Chitin, a biopolymer, is abundant in crustacean exoskeletons.
• Traditional chitin extraction methods often involve harsh chemicals, leading to environmental concerns.
• Developing sustainable and efficient chitin extraction techniques is crucial.

Purpose of the Study:

• To evaluate the efficacy of lactic ensilation using Lactobacillus plantarum for chitin extraction from Allopetrolisthes punctatus.
• To optimize fermentation parameters for enhanced lactic acid production and bacterial growth.
• To compare the quality and yield of chitin extracted via lactic ensilation versus chemical hydrolysis.

Main Methods:

• Lactic ensilation of Allopetrolisthes punctatus crab biomass using Lactobacillus plantarum sp. 47.
• Optimization of fermentation parameters: inoculum concentration, carbon source (sucrose), and incubation temperature.
• Chitin extraction and purification following fermentation.
• Chemical hydrolysis as a comparative extraction method.

Main Results:

• Optimal fermentation conditions identified: 10% inoculum, 15% sucrose, 85% crab biomass, yielding 17 mg lactic acid/g silage.
• Chitin extracted after 60 h fermentation exhibited 99.6% demineralization and 95.3% deproteinization.
• Lactic ensilation produced higher quality chitin with better demineralization and deproteinization compared to chemical hydrolysis.

Conclusions:

• Lactic ensilation is a viable and efficient method for extracting high-purity chitin from crab biomass.
• This bioprocess utilizes mild conditions, offering an environmentally friendly alternative to conventional chemical extraction.
• The optimized fermentation parameters ensure high lactic acid yield, contributing to effective chitin purification.