纳米复合材料包装对香菇在贮藏过程中品质及甲醛含量的影响

Effects of Nanocomposite Packaging on Quality and Formaldehyde Content of Lentinus edodes during Storage

为研究纳米复合材料包装袋对香菇贮藏过程中品质和甲醛含量的影响,采用纳米复合材料包装袋、普通袋包装处理香菇,以普通袋开口包装作为对照,于4℃贮藏15 d,跟踪测定贮藏过程中香菇的质量损失率、呼吸强度、相对电导率、可溶性糖含量、可溶性蛋白含量、γ-谷氨酰转肽酶(GGT)比活力、半胱氨酸亚砜裂解酶(C-Slyase)比活力、甲醛含量等指标。结果表明:纳米复合材料包装处理的香菇中甲醛含量和GGT、C-Slyase比活力呈正相关的关系(相关系数分别为0.920和0.916)。贮藏15 d后,纳米复合材料包装袋处理的香菇质量损失率(0.331%)、呼吸强度(199.80 mg/(kg·h))、相对电导率(5.97%)、GGT比活力(16.75 U/g)、C-Slyase比活力(489.86)U/g、甲醛含量(6.24 mg/kg)均低于普通包装的香菇,而可溶性糖和可溶性蛋白含量分别为7.50、9.37 g/kg,分别高出普通包装组的12.11%、5.40%。纳米复合材料包装袋与普通包装袋相比,能够更好地保持香菇贮藏品质,并抑制了香菇中甲醛的含量。

This study aimed to examine the influence of nanocomposite packaging on the quality and formaldehyde content of Lentinus edodes during storage. Lentinus edodes was treated by nanocomposite packaging or polyethylene (PE) packaging at 4 ℃ for 15 days. Meanwhile, open polyethylene packaging was used as the control. Weight loss rate, respiratory intensity, relative conductivity, soluble sugar, soluble protein, γ-glutamyl transpeptidase (GGT) activity, S-alkyl-L-cysteine sulfoxidelyase (C-Slyase) activity, and formaldehyde of Lentinus edodes were measured at regular intervals. Results showed that the formaldehyde content of Lentinus edodes treated by nanocomposite packaging correlated positively with the specific activities of GGT and C-Slyase with correlation coefficients of 0.920 and 0.916 respectively. After 15 days of storage at 4 ℃, weight loss rate, respiratory intensity, relative conductivity, GGT activity, C-Slyase activity, and formaldehyde content of Lentinus edodes treated by nanocomposite packaging were 0.331%, 199.80 mg/(kg·h), 5.97%, 16.75 U/g, 489.86 U/g and 6.24 mg/kg, respectively, which were lower than those of ordinary polyethylene packaging,while soluble sugar and soluble protein of Lentinus edodes treated by nano-packaging were 7.50 g/kg and 9.37 g/kg, respectively, which were increased by 12.11% and 5.40%, respectively, as compared with those of ordinary polyethylene packaging. Nano-packaging could be superior in maintaining the quality of Lentinus edodes and controlling the content of formaldehyde.