Thesis
Enhanced strategies to reduce post harvest splitting and stem browning in var. Skeena and var. Bing cherries using hyrdocolloid edible coatings (Gum acacia, Agar & Alginate)
Washington State University
Master of Science (MS), Washington State University
2017
Handle:
https://hdl.handle.net/2376/100669
Abstract
Sweet cherry is widely grown in the states of Washington, Oregon and California which account for 90% of total production in the country. Major post-harvest issues for this fruit include surface splitting or cracking and stem browning, which might occur during, packing process, distribution, and when the fruit is on the shelf. Edible coatings were tested to evaluate their effects in reducing the cracking and stem browning on the sweet cherry (Prunus avium), var. Bing and var. Skeena. Cherries were coated with the selected coatings and tested for quality through the storage period of 6 weeks. For the var. Bing, AG 4 (Gum Acacia Seyal 90% & Agar 10% g g-1) at 0.3% mg mL-1 , AS 1 (Gum Acacia Seyal 75% & Sodium Alginate 25% g g-1 ) at 0.5% mg mL-1 and AS 3 (Gum Acacia Seyal 95% & Sodium Alginate 5% g g-1) at 0.5% mg mL-1 , were effective in reducing the cracking compared to all other treatments. AG 1 (Gum Acacia Seyal 80% & Agar 20% g g-1) at 0.3% mg mL-1 and AG 9 (Gum Acacia Seyal 95% & Agar 5% g g-1) at 1% mg mL-1, were effective compared to all other treatments, in maintaining the stem browning. For the var. Skeena, “Gum Acacia, A. Senegal” treatment, was the most effective in reducing cracking and stem browning, maintaining pH and total soluble solids at the end of the storage period after 36 d. In another study with var. Skeena when tested with two treatment factors, packaging and hydrocolloid coating, no significant differences were observed for the treatment interactions. In this study the all cherries became moldy after 4 weeks of storage. This was attributed to excess moisture going into the bags during packing. Later evaluation of the experimental set-up in the plant was not ideal for surface moisture removal. Overall, the Gum Acacia (A. Senegal) coating treatment with adequate surface moisture removal before packing, proved to be effective in reducing the postharvest cracking and stem browning in cherries. Further study is needed to evaluate these effects with a broader experimental design.
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Details
- Title
- Enhanced strategies to reduce post harvest splitting and stem browning in var. Skeena and var. Bing cherries using hyrdocolloid edible coatings (Gum acacia, Agar & Alginate)
- Creators
- Gaurav Suresh Dhumal
- Contributors
- Girish M. Ganjyal (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Food Science, School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525110301842
- Language
- English
- Resource Type
- Thesis