LDPE/M-TiO2 composite films for modified atmosphere packaging to realize comprehensive preservation of strawberry (Fragaria x ananassa Duch.)

BACKGROUND A shelf-life that is too short is the main problem with strawberries. Nano-TiO2 can catalyze and oxidize ethylene under ultraviolet (UV) light irradiation to eliminate its ripening effect on fruits and prolong the freshness period. RESULTS In this work, nano-TiO2 modified by methacryloxy propyl trimethoxyl silane (KH570) was blended with low-density polyethylene (LDPE) to prepare modified atmosphere packaging (MAP), and the influence of TiO2 content on films was analyzed before and after UV treatment. The results show that the modified nano-TiO2 (M-TiO2) can be uniformly distributed in LDPE, improving its mechanical strength, hydrophobicity, oxygen barrier and UV shielding properties. A modified atmosphere with low ethylene, low O-2 and high CO2 can be created to inhibit the ripening and spoilage of strawberries. The weight loss rate of fruit can be effectively reduced. The tendency of fruit firmness decline and nutrient loss can be slowed and stabilized, contributing to controllable shelf-life. Excellent freshness preservation function can be realized without special UV treatment. CONCLUSION Since UV treatment is rare in actual storage and transportation, LDPE/M-TiO2 composite film has practical value as MAP for strawberry and similar non-climacteric fruits. (c) 2022 Society of Chemical Industry.

Automated summary

In this study, a modified atmosphere packaging (MAP) material was prepared by blending modified nano-TiO2 with low-density polyethylene (LDPE), which could effectively preserve the freshness of strawberries and similar non-climacteric fruits, extending their shelf life.