Department of Food Science & Technology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China.
Shanghai SOLON Information Technology Co., Ltd., 479 Chundong Road, Shanghai, 201108, China.
Int J Biol Macromol. 2024 Jan;254(Pt 1):127419. doi: 10.1016/j.ijbiomac.2023.127419. Epub 2023 Oct 16.
In this study, chitosan coatings with different degrees of deacetylation (DD, 88.1 % and 95.2 %) were electrostatically sprayed on sweet cherries to evaluate their impacts on postharvest characteristics and internal metabolism. The results showed that chitosan coating could effectively delay the change of weight, color, firmness, and maintain the content of total phenols, flavonoids and titratable acids, and inhibit the activities of β-galactosidase and polyphenol oxidase during cold storage. The storage qualities and physiological activities of sweet cherry were significantly correlated with the contents of sorbitol, 4-hydroxycinnamic acid, hydrogenated hydroxycinnamic acid, tyrosine, proline, glutamine, phenylalanine, and other metabolites. Chitosan coating may modulate fruit quality by inhibiting the energy metabolism, accelerating the accumulation of carbohydrates, and promoting the metabolism of phenylalanine and flavonoid. Especially, chitosan coating with 88.1 % DD had better wettability on sweet cherry's peel and displayed more obvious preservation effect through stronger metabolic regulation ability.
本研究采用不同脱乙酰度（DD，88.1%和 95.2%）的壳聚糖溶液对甜樱桃进行静电喷涂，以评估其对采后特性和内部代谢的影响。结果表明，壳聚糖涂层能有效延缓冷藏过程中樱桃失重、变色、硬度的变化，保持总酚、类黄酮和可滴定酸的含量，并抑制β-半乳糖苷酶和多酚氧化酶的活性。甜樱桃的贮藏品质和生理活性与山梨醇、4-羟基肉桂酸、氢化羟基肉桂酸、酪氨酸、脯氨酸、谷氨酰胺、苯丙氨酸等代谢物的含量密切相关。壳聚糖涂层可能通过抑制能量代谢、加速碳水化合物的积累以及促进苯丙氨酸和类黄酮的代谢来调节果实品质。特别是脱乙酰度为 88.1%的壳聚糖涂层对甜樱桃果皮具有更好的润湿性，通过更强的代谢调节能力表现出更明显的保鲜效果。
