Post-harvest Application of Methyl Jasmonate, 1-Methylcyclopropene and Salicylic Acid Elevates Health-promoting Compounds in Cold-stored ‘Kinnow’ Mandarin (Citrus nobilis Lour x C. deliciosa Tenora) Fruit

An investigation was carried out to evaluate the influence of the post-harvest application of different ethylene inhibitors viz., 1-methylcylcopropene (1-MCP; 500, 1000 and 1500 ppb), methyl jasmonates (MeJA; 1, 2 and 3 mM) and salicylic acid (SA; 1, 2 and 3 mM) on health-promoting compounds such as total phenols, total antioxidants, flavonoids, protein, total free amino acids and sugars in cold-stored ‘Kinnow’ mandarin fruit. The fruit were stored at 6 ± 1°C and 90 ± 5% RH for 75 days. Fruit treated with MeJA (1 mM), 1-MCP (1500 ppb) and SA (2 mM) maintained significantly highest levels of total phenols, total antioxidants activity, flavonoids, protein, total free amino acids and sugars as compared with the control. In conclusion the post-harvest application of MeJA (1 mM), 1-MCP (1500 ppb) and SA (2 mM) can be used to maintain the highest levels of these bioactive compounds in cold-stored ‘Kinnow’ mandarin fruit for up to 60 days

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Not AvailableStrawberries are among the most popular and attractive fruits due to their high visual appeal and desirable flavour. As strawberry is a non-climacteric fruit, it is harvested essentially fully ripe. However, the fruit has a high rate of metabolism and deteriorates in a relatively short time, even without the presence of decay-causing pathogens. The fruits are very soft and very susceptible to mechanical injury, physiological disorders, fungal attack and water loss. The resultant short post-harvest life limits consumer access to and fresh market potential for this valuable fruit crop. The present chapter embodies appropriate post-harvest technologies for successful handling and storage of strawberry in light of available literature.Not Availabl

Effect of Pre-harvest Treatments on the Cellulase Activity and Quality of Ber Fruit Under Cold Storage Conditions

Studies were carried out to find out the effect of various pre-harvest treatments such as CaCl2 (@ 0.5%, 1.0% and 2.0%), Ca(NO3)2 (@0.5%, 1.0% and 2.0%), GA3 (@ 20, 40 and 60 ppm) and Bavistin (@ 0.1%) on the cellulase activity and quality of 'Umran' ber fruits during cold storage. Marked trees were sprayed at colour break stage with the test chemicals. Fruits were packed in CFB boxes and placed in cold storage (3-5 oC and 85 90 % RH) for 30 days. The fruits were evaluated after 10, 20 and 30 days interval for various parameters such as cellulase activity, phenolics content, palatability rating and rotting percentage. Cellulase activity registered a gradual increase upto 20 days of storage thereafter a decline was noted in all the treatments. The palatability rating increased up to 10 days of storage in all the treatments, except control but subsequently it decreased with an advancement in storage period. Among the various pre-harvest treatments CaCl2 (2%) recorded minimum cellulase activity and rotting percentage and have also registered high palatability rating and phenolics content during cold storage conditions. Studies showed that pre-harvest application of CaCl2 (2%) maintained very good fruit quality and prolonged shelf-life for 20 days under cold storage conditions

Influence of Types of Modified Atmospheric Packaging (MAP) Films on Cold-Storage Life and Fruit Quality of ‘Kinnow’ Mandarin (Citrus nobilis Lour X C. deliciosa Tenora)

An investigation was aimed to evaluate the efficacy of different MAP films viz., low-density polyethylene (LDPE)-film (25 μ), LDPE-film (38 μ), polypropylene (PP)-film (25 μ), PP-film (38 μ), LDPE-film (25 μ) with pinholes, LDPE-film (38 μ) with pinholes, PP-film (25 μ) with pinholes, and PP-film (38 μ) with pinholes on cold-storage life and fruit quality of ‘Kinnow’ (Citrus nobilis Lour x C. deliciosa Tenora) mandarin. The packed and control fruits were kept under cold-storage conditions (5–7 °C and 90–95 % RH) up to 75 days. The fruits were sampled following 0, 30, 45, 60, and 75 days cold storage and assessed for different quality parameters. The results indicate variability among the different MAP treatments for weight loss, spoilage loss, juice content, firmness, pectin content, activities of fruit softening enzymes, soluble solids concentration (SSC), titratable acidity (TA), ascorbic acid content, total phenol content, total antioxidant activity, total carotenoids content, and organoleptic sensory attributes. Among all MAP treatments, PP-film (25 μ) with pinholes was the most effective in maintaining various fruit quality parameters such as SSC, TA, ascorbic acid, sensory attributes, and retarding the activities of fruit softening enzymes such as pectin methylesterase (PME) and cellulase fruit up to 60 days in cold storage. Positive correlation was found among ascorbic acid content, total antioxidant activity, and total phenols and between PME and cellulase activity

Postharvest application of methyl jasmonate, 1-methylcyclopropene and salicylic acid extends the cold storage life and maintain the quality of ‘Kinnow’ mandarin (Citrus nobilis L. X C. deliciosa L.) fruit

The objective of the present investigation was to evaluate the effects of different concentrations of 1-methylcyclopropene (1-MCP; 0.5, 1.0 and 1.5 μL L-1), methyl jasmonate (MeJa; 0.001, 0.002 and 0.003 μmol L-1) and salicylic acid (SA; 0.001, 0.002 and 0.003 μmol L-1) on cold storage life and fruit quality of ‘Kinnow’ mandarin for up to 75 d. Weight loss, spoilage loss, firmness, juice percentage, soluble solids content, titratable acidity, pectin content, total carotenoids and ascorbic acid content, organoleptic sensory attributes, pectin methylesterase and cellulase activity were determined. MeJa (0.001 μmol L-1), 1-MCP (1.5 μL L-1) and SA (0.002 μmol L-1) were the most effective in decreasing the weight loss, spoilage, firmness, juice content, and were retarding the activities of pectin methylesterase and cellulase compared to control. Treated fruit also had higher contents of ascorbic acid, pectin, total carotenoids and sensory attributes for 75 d of cold storage. In conclusion postharvest treatment of ‘Kinnow’ mandarin with MeJa (0.001 μmol L-1), 1-MCP (1.5 μL L-1) fumigation and SA (0.002 μmol L-1) extended cold storage life and maintained quality

Influence of carboxy methylcellulose, chitosan and beeswax coatings on cold storage life and quality of Kinnow mandarin fruit

Edible coatings are safer for human health and environment compared to synthetic waxes. The aim of this study was to assess the influence of different edible coatings on extending cold storage life and maintaining fruit quality of ‘Kinnow’ mandarin (Citrus nobilis L. x Citrus deliciosa L.). Kinnow fruit coating treatments included 1.0, 1.5 and 2.0 g L−1 carboxy methylcellulose (CMC), 0.5, 1.0 and 1.5 g L−1 chitosan and 5, 10 and 15 g L−1 beeswax were contrasted to the uncoated (control) fruit. The coated and uncoated fruit were kept under cold storage conditions (5–7 °C and 90–95% RH) up to 75 days. The fruit were sampled following 30, 45, 60 and 75 days cold storage and evaluated for different quality parameters and scanning electron microscopy of the peel surface. The results indicate variability among the different polymer coatings for weight loss, spoilage loss, juice content, firmness, pectin content, the activity of pectin methylesterase and cellulase, soluble solids concentration (SSC), titratable acidity (TA), ascorbic acid content, total carotenoids content and organoleptic sensory attributes. Improved fruit gloss was observed in all coatings treatments, however, with the extension of the cold storage period, the fruit coated with chitosan and beeswax showed outward ruptures on the rind. Amongst all, the coatings tested, CMC (2.0 g L-1) coating was the most effective in maintaining various fruit quality parameters such as SSC, TA, vitamin C, sensory attributes and retarding the activities of cell wall degrading enzymes such as pectin methylesterase and cellulase up to 60 days in cold storage