Paper Information

Journal:   THE PLANT PRODUCTION (SCIENTIFIC JOURNAL OF AGRICULTURE)   SUMMER 2017 , Volume 40 , Number 2 #A0044; Page(s) 99 To 112.
 
Paper: 

EVALUATION OF TEMPERATURE AND CONTAINER MATERIAL EFFECTS ON SUMMERWILD BLACKBERRY POSTHARVEST LIFE

 
 
Author(s):  HADDADINEJAD M., GHASEMI K.*, MOHAMMADI A.A.
 
* DEPARTMENT OF HORTICULTURE, FACULTY OF CROP SCIENCES, SARI AGRICULTURAL SCIENCES AND NATURAL RESOURCES UNIVERSITY, SARI, IRAN
 
Abstract: 

Background and Objectives: Blackberry cannot be conserved for long time due to its short post-harvest shelf life and rapid perishability. Recently, using small plastic containers has become popular that but is unfortunately non-biodegradable and incompatible with the environment so these materials are dangerous for the environment. But using biodegradable packages which are made up by natural materials like starch, corn, potato and wheat can be a suitable substitution. This research aimed to evaluate optimum conditions including temperature and container material for increasing summer wild blackberry shelf life.
Material and Methods: With the aim of evaluating summer wild blackberry optimum storage conditions, its fruits were compared via three levels of temperature (0, 4 and 25
°C) and two kinds of containers (biodegradable and non-biodegradable) during 14 days. Different characteristics comprising visual quality (fruit weight, fruit weight loss and market acceptance), edible quality (TSS, pH, TA, TSS/TA, flavor and taste) and health value (total antioxidant activity, total phenol content, total flavonoid content and total anthocyanin) were evaluated.
Results The obtained results showed fruit weight loos. During postharvest maintenance in all treatments, the highest fruit weight recorded on the first day and after that decreased significantly. In addition to fruit weight, length, width, flavor, taste and market acceptance of fruit decreased during storage, significantly. Visual quality of fruits packed in polystyrene container was better than bio based one. Total soluble solids of blackberries stored in biodegradable package were significantly higher than non-biodegradable container. Inhibitory percentage of DPPH radicals in all treatments showed powerful antioxidant properties of blackberry. The highest phenol content (62.33 gGalicacid/ g fruit juice) of fruits was recorded on the 3rd day at 4
°C in polystyrene container. The lowest amount of total phenol in the same temperature was observed after 8 days storage in biodegradable container. In both containers, the temperature of 0°C showed less decrease of flavonoid content. During the experiment anthocyanin content decreased generally but on the 8 th and 14 th days in polystyrene container and 0°C, its content increased from 224.99 on the first day at 0°C to 57.89 and 90.3 mg Cyanidin/Lit fruit juice in both containers types on the 14th day, significantly.
Discussions: Water loss due to transpiration and respiration is the main reason for weight loss during postharvest period. Because of this, using Nano particles in container materials around the fruits to control water exchange can reduce weight loss and influence different fruit characteristics as well. The positive effect of the 0
°C temperature on blackberry shelf life was significant. Using a biodegradable package despite its environmental importance showed less efficiency for increasing blackberry postharvest life in comparison with a plastic package and requires further research.

 
Keyword(s): SHELF LIFE, EDIBLE QUALITY, ANTIOXIDANT ACTIVITY, ANTHOCYANIN
 
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