Thesis
Studies on the effects of 1-methylcyclopropene, ozone, and fruit maturity on the postharvest quality of "Gala" apples under controlled atmosphere storage
Washington State University
Master of Science (MS), Washington State University
2011
Handle:
https://hdl.handle.net/2376/102990
Abstract
1-methylcyclopropene (1-MCP) is a useful tool for managing apple fruit ripening. The impacts of 1-MCP on apple fruit quality have been independently assessed. However, there is limited information concerning the effect of ozone on apple fruit. Ozone is commonly used to control decay and to prevent mold and bacteria on fruits. In this work, their combined effect was compared with the effect of each treatment alone and was applied at different harvest maturities on'Royal Gala' apples. Three different harvest maturities were used in this work; pre-climacteric maturity, climacteric maturity, and post-climacteric maturity. 'Royal Gala' apples were treated with 1ppm 1-MCP and 2ppm ozone at three different harvest maturities. After treatment, apples were stored in controlled atmosphere for 4 months. The fruit quality such as internal ethylene concentration (IEC), color, firmness, total soluble solids (brix), titratable acidity (TA), volatile compounds and visual damage of excessive ozone, was assessed at day 1 and 7 upon removal from storage. The results showed that apple fruits treated with 1-MCP and 1-MCP + ozone did block ethylene production at day 1 and 7 after storage regardless of harvest maturity. There were no significant differences in color changes for all treatments at all maturity stages. Fruits treated with 1-MCP and 1-MCP + ozone maintained firmness better than fruits treated with ozone and the untreated fruits. Results showed that there were no significant differences in both starch and brix content for all treatments at all maturity stages. Fruits treated with 1-MCP and 1-MCP + ozone had higher titratable acidity than ozone treated and untreated fruits. Fruits treated with ozone seemed to produce more alcohols both at day 1 and 7 after storage at all maturity stages , where 1-butanol, 2-methyl-1-butanol, and 1-hexanol were the major alcohols detected in this study. Ozone treated fruits produced the lowest amount of alcohols at all stages of maturity. Control fruits produced more aldehydes at day 1 and 7 after storage in pre-climacteric and climacteric stages, and fruits treated with ozone made more aldehydes at day 1 and 7 after storage. Fruits treated with ozone also produced more esters at day 1 and 7 after storage of all maturities compared to fruits from all other treatments. No lenticel breakdown was observed in this study. Results suggest ozone treatment triggers volatile compound production in apple fruits upon removal from controlled atmosphere storage.
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Details
- Title
- Studies on the effects of 1-methylcyclopropene, ozone, and fruit maturity on the postharvest quality of "Gala" apples under controlled atmosphere storage
- Creators
- Liana Suryaningsih
- Contributors
- John K. Fellman (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Horticulture, Department of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; Pullman, Wash. :
- Identifiers
- 99900525189801842
- Language
- English
- Resource Type
- Thesis