Development of complex fresh-keeping and water-holding agent for Penaeus vannamei by carboxymethyl chitosan

Penaeus vannamei is susceptible to blach change，microbial contamination，drying lose during storage，puzzling aquatic product industry. Sodium phytate，nisin and konjak oligosaccharide，as natural ingredients were selected from test of inhibition shrimp head dark，anti-bacteria and water-holding. Then complex formula of water and fresh-keeping for shrimp was developed for preparation with carboxymethyl chitosan，which had better water and fresh-keeping capacity. The results showed that the shelf life of shrimp could prolong for 3-4 days，and drying loss could be reduced by 50% after 6 months frozen storage，with regeant of 0.3% carboxymethyl chitosan，0.05% nisin，0.3% sodium phytate and 0.3% konjak oligosaccharide. Natural biological water and fresh-keeping agent without sulfur and phosphorus，was safe，efficient，had a larger space for development and prospects in current to food quality requirements.