Preparation of Starch-Based Antibacterial Fresh-keeping Pads and Its Effects on the Postharvest Storage Quality of Agaricus Bisporus
To effectively solve the problem of quality deterioration during storage of agaricus bisporus,thymol(TE)as the core material and β-cyclodextrin(β-CD)as the wall material were used to prepare a complex.The complex could enhance the stability of core materials and make the core materials release slowly.Then,a kind of starch-based antibacterial fresh-keeping pad was prepared by mixing the grafted cassava starch(CH-AA)with TE/β-CD complex in different mass ratios(0∶2,0.5∶1,1∶1,1.5∶1,2∶0)in the chitosan matrix.The structural characteristics of the pads were systematically studied by scanning electron microscopy,Fourier transform infrared spectroscopy,and X-ray diffraction.The results show that TE is successfully embedded,acrylic acid is successfully grafted,the prepared CH-AA and TE/β-CD complex could be successfully loaded and stabilized in the chitosan matrix.The test results of thickness,mechanical properties,water tentacles,antibacterial properties and antioxidant properties show that the addition of CH-AA increases the mechanical properties of the fresh-keeping pads,and the addition of TE/β-CD complex effectively enhances antibacterial and antioxidant activities of the fresh-keeping pads.Finally,the prepared pads were evaluated for their fresh-keeping effect on agaricus bisporus.The preservation parameters show that the fresh-keeping pads containing CH-AA and TE/β-CD complex could effectively maintain the hardness and color of agaricus bisporus,delay the increase in weight loss rate and total bacterial count.The fresh-keeping pads containing CH-AA and TE/β-CD complex with a mass ratio of 1∶1 has the best fresh-keeping effect during a storage test of 8 d,showing a weight loss rate of only 8.32%.Compared with the total bacterial count[(9.66±0.13)CFU/g]of the blank control,the total bacterial count in treatment group is only(7.23±0.27)CFU/g.The fresh-keeping pads could effectively inhibit the proliferation of microorganism and delay the deterioration of agaricus bisporus,which has broad application prospects in the preservation of postharvest agaricus bisporus.
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