The Influence of Flexible Film with Releasing Sulfur Dioxide on Quality of 'Vitis Labruscana Kyoho' Table Grapes

摘要

An active packaging film (APF1) with releasing low concentration sulfur dioxide (SO_2) was tested on quality of 'vitis labruscana kyoho' table grape. All samples were stored at 5°C and during the storage period the main quality parameters, weight loss, berries shatter, decay, firmness, total soluble solids content (TSS), total acid (TA, using the PH of grape juice instead of the TA), Vitamin c (Vc) content were monitored and compared with the control sample unpacked in any film. Results demonstrated that APF1 could reduce water loss of table grapes, and prevent it from pathogens infection. The results also showed that APF1 could greatly guarantee a long shelf life for grape. After having been stored 56 days (storage at 0～5°C), the water loss, berry firmness, TA and Vc content in grapes packaged in APF1 were slowly reduced, TSS was slight increased, percentage of shatter and decayed berries of grapes were 22% and 27%, respectively. The percentage of berries decay of grapes packaged in APF1 was reduced to 5% from 21% for control batches on 11th days. All unpackaged table grapes (control batches) were decayed after 28 days. APF1 would help to preserve quality and extend shelf life of table grapes.