Effects of Preservation using Response Surface Methodology on Fresh-cut Taro
Abstract
In order to evaluate the effect of preservation on fresh-cut taro, the edible coatings preservatives were connected with Konjac glucan-mannan (KGM), potassium sorbate, chitosan, by determining changes of weight loss rate, browning degree (BD), polyphenol oxidase (PPO) and peroxidase (POD), the preservative effect on fresh-cut taro were studied. The optimal composite of Konjac glucan-mannan (KGM), potassium sorbate, chitosan was analyzed by single factor test and Box-Behnken response surface method. The results showed the optimal concentration were KGM 6g/L, potassium sorbate 4g/L and chitosan 8g/L. Verified test showed that composite coating could reduce the weight loss rate, browning, PPO and POD activity of fresh-cut taro.
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Introduction
Colocasia esculenta (L), also known as taro, its edible part is the main underground bulb. Like other fresh-cut products, fresh-cut taro is also very easy to brown during processing and storage, which seriously affects the commercial value of the product. Konjac glucomannan is a natural plant polysaccharide, which can be dissolved in water will form a highly viscous pseudoplastic solution. At present, the research on konjac glucomannan film coating in fresh fruits and vegetables has been reported, but composite coating preservation of konjac glucomannan on taro has not been reported. Chitosan is a polysaccharide biological macromolecule, which has the advantages of safe, non-toxic, film-forming and bacteriostatic, edible and biodegradable, and has been widely reported [1] in recent years. The preservative potassium sorbate used in food was used as strengthening agent [2]. The best combination of Konjac glucomannan, potassium sorbate and chitosan was screened by single factor experiment and response surface design-expert analysis, exploring its mechanism of action, And providing technical support and theoretical basis for the application of konjac glucomannan composite coating film in taro storage and preservation.
Conclusion
Through the quadratic polynomial regression equation model, the optimal proportion of KGM composite film was ethyl chitosan 8 g/L, potassium sorbate 4 g/L, KGM 6 g/L, composite coating treatment on taro could reduce the quality loss, slow browning, the inhibition of PPO and POD activity.
