海泡石填充PE保鲜膜的研制及其在平菇保鲜中的应用

Development of sepiolite filled fresh-keeping film and its application to fresh-keeping of mushroom

以LDPE/LLDPE(4:1)为基材,选择具有调湿性能的酸活化海泡石为无机填充剂,针对改善薄膜的透气性和透湿性,制备了不同添加量的海泡石PE保鲜膜。结果表明:随着海泡石添加量的增多,薄膜的拉伸强度和断裂伸长率不断降低,但薄膜的透氧率和透湿性能得到改善。通过对平菇保鲜实验,证明酸活化处理的海泡石填充膜对平菇的保鲜效果优于未包装的对照组。以填充40份酸活化处理的海泡石填充膜包装的平菇保鲜效果最好,其包装的平菇的呼吸高峰出现最晚,且呼吸峰值最低(383.6mL/kg.h),第6d的失重率为5.34%,在15℃左右下可保鲜7d,比未包装的对照组延长了5d。

The LDPE/LLDPE （4：1） material was used as a substrate and the acidification sepiolite as inorganic filler to improve the gas and vapor transmission rate of PE film. The results showed that as the amounts of acidification sepiolite increased, the tensile strength and the elongation rate at break of the films were reduced gradually, but the gas and vapor permeation rate of the films increased gradually. By testing the respiration rate, percentage of losing-weight, and sensory quantity, it was indicated that the film with 40 share acidification sepiolite was the best for preservation of mushrooms. The respiration peak of mushroom appeared the latest, the peak value was the lowest at 383.6mL/kg·h, and the percentage of weight loss of mushrooms amounts to 5.34% after 6d.At about 15℃, the mushrooms could keep fresh for 7d, which was 5d longer than CK.