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Evaluation of the Effectiveness of Light Emitting Diodes in Post-harvest Shelf Life Extension of Blueberries

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dc.contributor.advisor Singh, Ashutosh
dc.contributor.author Sandhu, Ramandeep Kaur
dc.date.accessioned 2019-01-04T15:25:42Z
dc.date.available 2019-01-04T15:25:42Z
dc.date.copyright 2018-12
dc.date.created 2018-12-04
dc.date.issued 2019-01-04
dc.identifier.uri http://hdl.handle.net/10214/14721
dc.description.abstract Light emitting diodes (LEDs) are being used as a cost-effective alternative light source during plant growth to regulate the overall quality of fruits and vegetables; however, they have been used infrequently at the post-harvest stage. Their capability of narrow bandwidth emission and controllable spectral distribution holds a potential to help food producers and distributors in reducing wastage incurred during the post-harvest activities. LEDs can potentially help in regulating senescence, ripening and nutritional attributes in fruits and vegetables. The objective of the thesis is to develop a LED post-harvest system for fresh fruits and vegetables and evaluate the effect of LED lights of different wavelengths and photon flux intensities on nutritional content and shelf life of fruits and vegetables at different temperatures and treatment times. Blueberries were measured for change in weight, diameter, colour, TSS and anthocyanin content to evaluate the effect of LED lights on ripening. Phenolic compounds were estimated and quantified using Folin-Ciocalteau reagent and HPLC assays and Antioxidant activity was determined using scavenging activity on DPPH radicals and FRAP. The results suggest that under some conditions of illumination with LEDs, the nutritional content enhanced, and ripening was delayed. The results from this thesis will help researchers to identify optimal LED treatment parameters for post-harvest enhancement of the overall quality of fruits and vegetables. This will also help in determining the potential applications of LEDs in various post-harvest management operations of food to reduce losses and help in building the competence of the food supply system. en_US
dc.language.iso en en_US
dc.publisher University of Guelph en_US
dc.rights Attribution-NonCommercial-NoDerivatives 4.0 International *
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/4.0/ *
dc.subject Light emitting diodes en_US
dc.subject soluble sugars en_US
dc.subject phenolics en_US
dc.subject antioxidant en_US
dc.subject anthocyanin en_US
dc.subject post-harvest en_US
dc.title Evaluation of the Effectiveness of Light Emitting Diodes in Post-harvest Shelf Life Extension of Blueberries en_US
dc.type Thesis en_US
dc.degree.programme Engineering en_US
dc.degree.name Master of Applied Science en_US
dc.degree.department School of Engineering en_US
dc.degree.grantor University of Guelph en_US


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