Shelf Life Quality of Plum Fruits (Prunus domestica L.) Improves with Carboxymethylcellulose-based Edible Coating

in HortScience

This study investigated the carboxymethylcellulose (CMC)-based edible coating effects on some quality parameters and enzyme activities of plum fruits (Prunus domestica L. cv. Golden drop) during their shelf life. Three concentrations of CMC (0.5%, 1%, and 1.5%), plasticized with glycerol (0.3% w/v), were applied to plum fruits plus a control treated with only distilled water. The results demonstrate that the CMC-based edible coating was significantly effective in maintaining firmness and titratable acidity (TA); vitamin C, anthocyanin, and flavonoid content; and the antioxidant capacity of plum fruits. Enzymatic activity was affected significantly by the coating. Peroxidase (POD) activity increased, and polyphenol oxidase (PPO) and polygalacturonase (PG) decreased. In general, the formulation consisting of 1% CMC showed the best results in most of the measured parameters. Taking into account the positive effects on qualitative and biochemical characteristics of CMC-based edible coatings on plums, their application can be a potentially promising method to enhance the shelf-life of this fruit.

Contributor Notes

This research has been funded in part by the University of Tabriz in support of S. Panahirad’s PhD dissertation.

Corresponding author. E-mail: mahna@tabrizu.ac.ir or n.mahna@gmail.com.

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    (A) Titratable acidity (TA) at harvest (day 0) and on days 2, 4, 6, and 8 at 19 °C of control and plums coated with carboxymethylcellulose (CMC) at 0.5%, 1%, and 1.5%. Analysis results = 1.444 (b), 1.471 (b), 1.544 (a), and 1.364 (c) for control, 0.5%, 1%, and 1.5% CMC, respectively. (B) Data are the estimated marginal means ± 95% confidence intervals.

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    (A) Firmness values at harvest (day 0) and on days 2, 4, 6, and 8 of control and plums coated with carboxymethylcellulose (CMC) at 0.5%, 1%, and 1.5%. Analysis results = 5.53 (c), 7.0 (b), 9.0 (a), and 9.13 (a) for control, 0.5%, 1%, and 1.5% CMC, respectively. (B) Data are the estimated marginal means ± 95% confidence intervals.

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    (A) Polygalacturonase (PG) activity at harvest (day 0) and on days 2, 4, 6, and 8 of control and plums coated with carboxymethylcellulose (CMC) at 0.5%, 1%, and 1.5%. Analysis results = 0.2398 (d), 0.2094 (c), 0.1993 (b), and 0.1906 (a) for control, 0.5%, 1%, and 1.5% CMC, respectively. (B) Data are the estimated marginal means ± 95% confidence intervals.

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    (A) Vitamin C contents at harvest (day 0) and on days 2, 4, 6 and 8 at 19 °C of control and plums coated with carboxymethylcellulose (CMC) at 0.5%, 1%, and 1.5%. Analysis results = 6.87(b), 8.27 (a), 8.8 (a), and 8.4 (a) for control, 0.5%, 1%, and 1.5% CMC, respectively. (B) Data are the estimated marginal means ± 95% confidence intervals.

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    (A) Anthocyanin and flavonoids values at harvest (day 0) and on days 2, 4, 6 and 8 d of control and plums coated with carboxymethylcellulose (CMC) at 0.5%, 1%, and 1.5%. Analysis results = 0.3188 (b), 0.4368 (a), 0.4712 (a), and 0.4558 (a) for anthocyanin; and 185 (b), 202 (a), 173 (b), and 172 (b) for flavonoids for control, 0.5%, 1%, and 1.5% CMC, respectively. (B) Data are the estimated marginal means ± 95% confidence intervals.

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    (A) Total antioxidant activity using 1,1-diphenyl-2-picryl-hydrazyl hydrate radical scavenging activity method at harvest (day 0) and on days 2, 4, 6, and 8 of control and plums coated with carboxymethylcellulose (CMC) at 0.5%, 1%, and 1.5%. Analysis results = 6.848 (c), 13.923 (b), 15.48 (b), and 20.264 (a) for control, 0.5%, 1%, and 1.5% CMC, respectively. (B) Data are the estimated marginal means ± 95% confidence intervals.

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    (A) Peroxidase (POD) activity at harvest (day 0) and on days 2, 4, 6, and 8 of control and plums coated with carboxymethylcellulose (CMC) at 0.5%, 1%, and 1.5%. Analysis results = 0.13 (d), 0.2228 (b), 0.1819 (c), and 0.274 (a) for control, 0.5%, 1%, and 1.5% CMC, respectively. (B) Data are the estimated marginal means ± 95% confidence intervals.

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    (A) Polyphenol oxidase (PPO) activity at harvest (day 0) and on days 2, 4, 6, and 8 of control and plums coated with carboxymethylcellulose (CMC) at 0.5%, 1%, and 1.5%. Analysis results = 0.0181 (b), 0.0156 (a), 0.0135 (a), and 0.0137 (a) for control, 0.5%, 1%, and 1.5% CMC, respectively. (B) Data are the estimated marginal means ± 95% confidence intervals.

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