Packaging materials effect on quality of raisins to enhance the shelf life of stored raisins

Abstract

The packaging materials effect on quality of raisins to enhance the shelf life of stored raisins for Thompson seedless. Raisins samples are packed with four different packaging materials viz., polypropylene (PP) (100 gauge), Low density polyethylene (LDPE 1) (200 gauge), laminated aluminum foil (LAF) (300 gauge), and low-density polyethylene (LDPE 2) (400 gauge) for to check the quality of raisin. The samples were stored at 10±2ºC at 85 – 90% RH in refrigerator and ambient condition (room temperature). The parameters like Color Intensity, Reducing Sugars and Microbial Analysis were done at the 30 days of regular interval. The reducing sugar value was highest recorded 66.85% to 68.21% and total plate count was found of 9.8×10³ cfu/gm in non-vacuum packed PP packaging material at room temperature and lowest recorded was 66.85% to 67.72% and total plate count was not recorded any colonies 180 days after storage in vacuum packed LAF packaging material stored at cold temperature (10±2ºC). The results were obtained from study shows that the samples stored at cold temperature in LAF packaging material with vacuum packaging shows better results compared to other three. Polypropylene cost 189.86 and Low-Density Polyethylene (400 gauge) 191.55. Thus, polypropylene (100 gauge) is the cheapest packaging material for raisins. The mean score for color/appearance, texture, taste, flavor and overall acceptability of samples packed in different types of packaging materials and stored at different conditions ranged from 6.6 to 6.9 and 6.9 to 7.1 respectively.