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Calcinated Shell Powder from Corbicula fluminea as a Natural Antimicrobial Agent for Soybean Curd (Tofu) Preservation

The waste clam shells from Corbicula fluminea is a problem that needs to be solved in Taiwan. We aimed to develop the shell powder for use as antimicrobial agent in soybean curd (tofu) preservation. The calcined clam shell powder (CCSP) characteristics, antimicrobial ability and influence on tofu quality were studied. The results have shown the significantly inhibitoratory effect on Aspergillus niger, Bacillus cereus, Kloeckera apiculata were found. Tofu (1.0 and 1.5 g/L CCSP addition) exhibited dimensional reticular structure, and the sensory evaluation of tofu which added with 0.5 and 1.0 g/L of CCSP showed higher mouthfeel, texture, and lower beany-flavor. The shelf-life of tofu could be extending for 3 d when added with 1.5 g/L of CCSP. The CCSP was firstly reported as an antimicrobial agent in the paper. On the basis of the overall observations, CCSP can be regarded as a natural antimicrobial agent on tofu processing and preservation.