Malic enzyme activity and related Biochemical aspects during ripening of γ-irradiated mango fruit

Dubery, Ian A.; Rensburg, Lorinda Janse Van; Schabort, J.C.

doi:10.1016/s0031-9422(00)80470-7

Cited by 25 publications

(11 citation statements)

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“…With the onset of ripening, the levels of malic and succinic dehydrogenase increased, whereas the level of citrate synthase increased several fold on maturation but decreased markedly at ripening (Boqui et al 1974). Generally, the activity of most of organic acids increases during ripening, reaching its maximum a little ahead of the climacteric peak and then declines (Dubery et al 1984). A decline in acidity demonstrates advancement of maturation and ripening; thus, edible coating contributes to delaying the fruit maturation and ripening through reduction of respiration rate and lower utilization of organic acids stored in the vacuoles as respiratory substrate (Medlicott et al 1987).…”

Section: Shelf-life Extension Of Mangoes 589mentioning

confidence: 98%

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Pectin‐based Edible Coating for Shelf‐life Extension of Ataulfo Mango

Moalemiyan

Ramaswamy

Maftoonazad

2011

J Food Process Engineering

106

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Mango is a commercial but highly perishable fruit, and therefore, a longer shelf life is necessary for its successful marketing and consumer satisfaction. This study aims at evaluating the effects of edible coating, based on pectin, on the quality and shelf‐life extension of mangoes. The coating formulations included different combinations of pectin, beeswax, sorbitol and monoglyceride. The fruits were coated and stored at room temperature along with uncoated controls. Samples tested were evaluated periodically for quality parameters, which included visual observation, weight loss, respiration rate, color, firmness, pH, soluble solids (SS), titrable acidity and extent of decay. The coated‐fruits reduced the rate of color development, texture softening, weight loss, CO2 evolution and acid production (only pH and SS increased) compared with the control. The shelf life of control sample was less than a week, whereas the coated fruits remained good for over 2 weeks, thereby offering a significant advantage. PRACTICAL APPLICATIONS The study evaluates the use of pectin‐based edible coating for extending the shelf life of mango. The formulation is a blend of hydrophilic and hydrophobic groups to provide controlled respiration and water vapor permeability. The properties of pectin films have been highlighted in a previous paper, and several applications based on the coating have been demonstrated. The present study demonstrates that modifications to the formulation were necessary in order to successfully apply it to mango. Mango is a popular commercial product with high heritability. Simple edible coatings that can help to improve the shelf life and marketability of the product will be of significant interest in the marketing of mango products.

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Section: Shelf-life Extension Of Mangoes 589mentioning

confidence: 98%

“…1974). Generally, the activity of most of organic acids increases during ripening, reaching its maximum a little ahead of the climacteric peak and then declines (Dubery et al . 1984).…”

mentioning

confidence: 99%

Pectin‐based Edible Coating for Shelf‐life Extension of Ataulfo Mango

Moalemiyan

Ramaswamy

Maftoonazad

2011

J Food Process Engineering

106

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“…Thomas (1993) reported that there was a transient increase in the respiration rate of mangoes immediately after irradiation which could possibly be an implication of stress response. However, the actual respiratory climacteric was delayed as well as suppressed by the irradiation treatment in mangoes (Boag et al 1990;Dubery et al 1984). Irradiation treatment of 'Haden' mangoes with a 750 Gy dose suppressed the respiratory climacteric to a greater extent and also reduced the peak activity of malic enzyme during ripening (Dubery et al 1984).…”

Section: Irradiationmentioning

confidence: 98%

“…However, the actual respiratory climacteric was delayed as well as suppressed by the irradiation treatment in mangoes (Boag et al 1990;Dubery et al 1984). Irradiation treatment of 'Haden' mangoes with a 750 Gy dose suppressed the respiratory climacteric to a greater extent and also reduced the peak activity of malic enzyme during ripening (Dubery et al 1984). Similarly, 'Kensington Pride' mangoes had reduced respiratory activity when these were treated with a 200 Gy dose of gamma irradiation (Boag et al 1990).…”

Section: Irradiationmentioning

confidence: 99%

Mango

Singh

2012

Crop Post‐Harvest: Science and Technology

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“…Malate accumulates during early growth followed by its conversion to sugars during ripening. Malic enzyme activity participates in the mobilization of malate during the ripening process of climacteric fruits (Hulme, Jones & Wooltorton, 1963;Dubrey, van Rensburg & Schabort, 1984;Ruffner et al, 1984). Thus, malate accumulates in green berries and falls rapidly after the onset of ripening, concomitant with pronounced increase in sugar concentration due to gluconeogenic metabolism of malate (see Ruffner,I 982).…”

Section: (B) Fruit and Seed Developmentmentioning

confidence: 99%

Non‐photosynthetic Fixation of Carbon Dioxide and Possible Biological Roles in Higher Plants

Basra

Malik

1985

Biological Reviews

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Summary 1. Non‐photosynthetic fixation of CO2/HCO3‐ occurs both under light and dark conditions and involve the addition of carbon to substrates which in higher plants are derived originally from carbon reduced to carbohydrates during photosynthesis. Despite the endergonic nature of these carboxylations, the advantages offered seem to be sufficient to outweigh the disadvantages of energy loss. 2. Non‐photosynthetic carbon incorporation into metabolism is dealt mainly in relation to PEP carboxylase, acetyl‐CoA carboxylase, carbamoyl phosphate synthetase and phosphoribosylaminoimidazole carboxylase while other carboxylases await further characterization or discovery. The extent to which a carboxylase participates depends upon the need for products of its activity in metabolism. 3. Non‐photosynthetic carbon fixation is intricately involved in several pathways of metabolism throughout the ontogeny of plants. The roles in relation to leaf carbon metabolism, respiratory metabolism, nitrogen metabolism, lipid and isoprenoid biosynthesis, purine and pyrimidine metabolism and metabolism associated with the action of growth regulators have been described. The fixation reactions appear to be largely concerned with the production of intermediary metabolites, circumvention of energy barriers in metabolism and regulation of plant metabolism. In addition, the activity of PEP carboxylase is involved in ionic balance and pH‐stat. 4. Malate derived by way of PEP carboxylase and NAD‐malate dehydrogenase acts as an effective osmoticum and a counter‐ion for K+ accumulation in actively growing plant cells. In addition, malate may enter the TCA cycle or can be decarboxylated by cytoplasmic NADP‐malic enzyme converting NADH to NADPH. Wherever it has been sought in different plant tissues, some evidence for PEP carboxylase and metabolism of malate has always been found. 5. Almost every plant process spanning from seed development and germination to flowering and fruit‐set requires the essential participation of non‐photosynthetic carbon fixation in regulating certain metabolic and cellular functions but it does not contribute in a major way to the carbon nutrition of plants. It is largely the tissue type that appears to determine which of the roles is predominant at any one time.

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Malic enzyme activity and related Biochemical aspects during ripening of γ-irradiated mango fruit

Cited by 25 publications

References 11 publications

Pectin‐based Edible Coating for Shelf‐life Extension of Ataulfo Mango

Pectin‐based Edible Coating for Shelf‐life Extension of Ataulfo Mango

Mango

Non‐photosynthetic Fixation of Carbon Dioxide and Possible Biological Roles in Higher Plants

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