استعمال بعض المستخلصات النباتية وسكر البوليولان في إطالة مدة حفظ التفاح

Abstract

The effect of using the methanolic extract of Lavandula officinalis L. and pullulan a coating solution was studied as individually or mixed in different percent in growth of some selected microorganism's strains. The results showed that the rate of inhibition (%) for Escherichia coli, Salmonella ssp., Aspergillus ssp., Penicillium ssp., Candida albicans and Pichia jadinii were 58.3 at 100% Lavender extract was used, 47.7 by using 100% pullulan, 60.2 by using 75:25% mix of lavender extract and pullulan, 67.8 by using 50:50% mix of lavender extract and pullulan and it was 53.8 by using 25:75% mix of lavender extract and pullulan. It was noted that the percentage rate of weight loss (%) in apples coating was 6.27 by using 100% sterile distilled water, 5.77% by using 100% lavender extract, 4.37 by using 100% pullulan, 4.51 by using 75:25% mix of lavender extract and pullulan, 3.47 by using 50:50% mix of lavender extract and pullulan and it was 5.39 by using 25:75% mix of lavender extract and pullulan in storage at 25°C for 21 day. While the spoilage of apples which stored for 21 days at 25°C was observed on the 4th, 6th, 8th, 9th, 11th and 15th day by using sterile distilled water (control), 100% sterile distilled water, 100% pullulan, 25:75% mix of lavender extract and pullulan, 75:25% mix of lavender extract and pullulan, 100% lavender extract and 50:50% mix of lavender extract and pullulan as a coating solution respectively.