Extending the shelf-life of fresh fruits and vegetables using nitric oxide treatment
A postharvest treatment using sodium nitroprusside (SNP), a nitric oxide donor, to delay senescence in fresh fruits and vegetables. SNP suppresses oxidative stress, enhances antioxidant capacity, and reduces chlorophyll degradation, offering a promising approach to extend produce shelf-life and reduce postharvest losses.
Overview
This research focuses on extending the shelf-life of fresh fruits and vegetables through the application of nitric oxide (NO), specifically using sodium nitroprusside (SNP) as an NO donor. Postharvest losses of fresh produce represent a significant economic and sustainability challenge. The proposed approach leverages the biological role of NO in mediating plant defensive responses to stress, including suppression of hydrogen peroxide accumulation and lipid peroxidation, both of which contribute to senescence. By enhancing antioxidant capacity and maintaining cellular redox homeostasis, SNP treatment has the potential to delay ripening, preserve visual quality, and extend the marketable life of fresh produce.
Technical specifications
Mechanism of action:
- SNP releases nitric oxide, which suppresses H2O2 accumulation and lipid peroxidation in plant tissues
- NO treatment enhances antioxidant enzyme activities and improves chlorophyll retention
- Treatment helps maintain cellular redox homeostasis, decreasing chlorophyll catabolism
- SNP upregulates synthesis of phenolics and anthocyanin, contributing to antioxidant defense
Observed effects in prior studies:
- Delays senescence in blueberries by enhancing antioxidant ability during storage
- Reduces chlorophyll degradation and delays yellowing in broccoli florets after harvest
- Enhances antioxidant enzyme activities in banana fruits following cold storage
- Improves chlorophyll content in canola plants under metal stress conditions
Planned validation activities:
- Testing different concentrations of SNP on vegetables and fruits across multiple postharvest stages
- Examining physiological and biochemical changes in broccoli and lettuce during senescence under SNP treatment
- Identifying genes associated with senescence under SNP treatment to understand molecular mechanisms
Technology readiness level
This research is at an early-to-mid stage of development. Prior studies from other groups have demonstrated proof-of-concept for SNP application in delaying senescence in blueberries, bananas, and broccoli. The University of Florida team plans to extend this work by systematically testing SNP concentrations on additional commodities, measuring physiological and biochemical markers, and investigating the underlying molecular mechanisms through gene expression analysis. Further validation is needed to optimize treatment protocols, determine efficacy across different produce types, and establish commercial readiness before deployment in postharvest handling operations.
About University of Florida
The University of Florida is a comprehensive public research university with a broad academic and research portfolio and a statewide presence. Industry collaborates through co-located labs and shared core facilities and through an integrated academic health system that accelerates clinical translation. A statewide extension network and multiple research and education sites connect companies with field-scale testing and rapid deployment, while incubators and an adjacent innovation district provide pathways from lab to market. Research is supported by competitive funding from major federal agencies such as NIH, NSF, USDA, and DOE. A dedicated technology transfer office supports IP, licensing, and startup formation.
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