摘要
以聚乙烯(PE)/乙烯-醋酸乙烯共聚物(EVA)为基体树脂,分别添加2.5%、5%、7.5%、10%分子筛,吹制PE/EVA/分子筛复合气调包装膜,并对新鲜采摘菠菜进行常温保鲜包装研究。测定了保鲜膜的拉伸强度、断裂伸长率和撕裂强度,对菠菜包装的保鲜效果进行感官评价,研究随着分子筛含量的增加,菠菜失重率、可溶性固形物和呼吸强度的变化。结果表明:室温下添加EVA和分子筛可增大保鲜膜的气体透过性,有效抑制菠菜的呼吸作用。当分子筛含量为7.5%时,薄膜的保鲜性能最好。气调保鲜包装的平衡气体浓度O2含量为8.7%～9.3%、CO2含量为7.2%～7.7%。PE/EVA/分子筛复合保鲜膜比纯PE膜更适于菠菜的保鲜。
Molecular sieve was introduced into blends of polyethylene/ethylene-co-vinyl acetate （PE/EVA）, based on which composite blown films were prepared as packaging film for fresh spinach. The tensile strength, elongation at break, and tearing strength of the film were examined. The sensory evaluation for the fresh-keeping effect of the film was also made. The effect of content of molecular sieve on the weight loss, fraction of soluble solids, and respiration rate of spinach were examined. At ambient conditions, with increasing content of molecular sieve, the air permeation of the film increased, and the respiration rate of spinach was increasingly restrained. When the content of molecular sieve was 7.5 %, an equilibrium concentration of O2 8. 7 %-9. 3% and CO2 7. 2 %-7. 7 % in the package was obtained.
出处
《中国塑料》
CAS
CSCD
北大核心
2009年第7期73-76,共4页
China Plastics
基金
"十一五"国家科技支撑计划重大项目(2006BAD05A05)
关键词
聚乙烯
保鲜
呼吸作用
菠菜
乙烯-醋酸乙烯共聚物
分子筛
polyethylene
fresh-keeping
respiration
spinach
ethylene-vinyl acetate copolymer
molecular sieve
