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6. Preparation of Polylactic Acid/Chitosan/Cinnamaldehyde One-Way Moisture Barrier Bilayer Film and Its Application in the Preservation of Pleurotus geesteranus

Author

CHEN Xiumei, LIN Yan, CHEN Junyu, TAN Xiaoli, CHE Jinxin, TAO Nengguo

Subjects
one-way moisture barrier film, polylactic acid, chitosan, cinnamaldehyde nanoemulsion, pleurotus?geesteranus preservation, Food processing and manufacture, TP368-456
Abstract

Pleurotus geesteranus, being rich in nutrients and moisture, easily loses water and wilts after harvest, reducing its commercial value. Furthermore, film packaging leads to excessive humidity in the internal environment, causing products to decay. In this study, polylactic acid (PLA) and chitosan (CS) were used as film-forming substrates to prepare a one-way moisture barrier bilayer film containing 0.25% cinnamaldehyde nano-emulsion (CANE). The microstructure, physical properties, optical properties, mechanical properties, moisture barrier properties and sustained release behavior of the film were investigated and its application in the preservation of P. geesteranus was evaluated. The results showed that the combination between PLA and CS could effectively make up for the defects of the monomer film, and the layers in the composite film with 0.25% CANE were tightly bound to each other, with a retention rate of 42% for cinnamaldehyde (CA). The film had strong ultraviolet resistance and the smallest settling speed of water droplets. The P layer had good water vapor barrier properties, and the C layer had good hydrophilicity. Compared with polyethylene (PE) film packaging, the 0.25% CANE-PLA-CS bilayer film significantly inhibited the browning and respiratory intensity of P. geesteranus during postharvest storage, delayed the increase in mass loss, soluble solids content, browning degree, electrical conductivity and malondialdehyde (MDA) content, reduced the activities of polyphenol oxidase (PPO) and peroxidase (POD) and maintained higher superoxide dismutase (SOD) activity. These results indicated that the one-way moisture barrier bilayer film could effectively delay the browning and aging of P. geesteranus and maintain its commercial value. This study provides theoretical support for the preparation of novel packaging materials for mushrooms and is of guiding significance to the reduction of post-harvest loss of P. geesteranus.

Published
2024
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16. Bioinformatics Analysis of PacC Gene of Geotrichum citri-aurantii Isolated from Citrus Fruit and Its Expression Pattern in Response to pH

Author

ZHENG Jie, TAN Xiaoli, HU Jinjin, TAO Nengguo, OUYANG Qiuli, LI Maohui, LI Lu

Subjects
geotrichum citri-aurantii, pacc, bioinformatics, ph, expression pattern, Food processing and manufacture, TP368-456
Abstract

Studies have shown that Geotrichum citri-aurantii can adjust the pH of infection sites to enhance its pathogenicity, and PacC, a key transcription factor in the pH signal transduction pathway, plays an important role in fungal response to environmental pH changes, but the role of PacC in G. citri-aurantii remains unclear. In this study, two candidate PacC genes were annotated from the genome of G. citri-aurantii and analyzed by bioinformatics methods and their expression patterns under different pH conditions were also studied. The results showed that PacC1 and PacC2 belonged to the C2H2 protein family, and were closely related to the PacC of Penicillium digitatum. PacC1 and PacC2 had differences in chromosomal location, protein molecular mass and isoelectric point. Under in vitro conditions, G. citri-aurantii could adapt to a wide range of pH, and the optimal pH value was found to be 3.0. The expression of PacC1 and PacC2 was regulated by pH, and their expression trends were similar. Under in vivo conditions, the pH of sour rot lesions in ‘Miyagawa-wase’ mandarin fruit tissue at pH > 3.0 decreased significantly with the progression of the disease, while the pH of sour rot lesions in Eureka lemon fruit tissue at pH < 3.0 increased significantly, and the relative expression levels of PacC1 and PacC2 showed an increasing trend. In conclusion, it can be seen that the environmental pH affects the growth of G. citri-aurantii, which in turn regulates the environmental pH. Due to the differences in gene structure and physicochemical properties, the degree and mode of pH response are different between the two PacC genes. They play an important role in the wide pH adaptability of G. citri-aurantii and in accelerating its infection process in citrus fruit.

Published
2023
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