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<p>A study was conducted to investigate the effect of sustainable coating materials on the quality and shelf life of tomatoes using an advanced electrostatic spray coating technique, in comparison to the conventional dip coating method. The experiments were performed at 25 ± 2&#xa0;°C and 52 ± 3% relative humidity over a storage period of 35&#xa0;days. Two composite coatings, designated as CMC-A and CMC-B, were prepared from carboxymethyl cellulose (CMC), polyvinyl alcohol (PVA), and orange peel extract (OPE) at ratios of 1.0:0.05:0 and 1.0:0.05:0.5 wt/v%, respectively. The antioxidant activity of the coatings was evaluated using the DPPH assay. Both CMC-A and CMC-B effectively delayed spoilage compared to uncoated controls. Significant charge-to-mass ratios of 1.65 mC/kg (CMC-A at 1.0&#xa0;kV) and 1.23 mC/kg (CMC-B at 1.25&#xa0;kV) were obtained at a 10&#xa0;cm nozzle-to-Faraday cage distance and 4&#xa0;bar air pressure, confirming the electrostatic chargeability of the coating formulations. Electrostatic spraying of CMC-B notably reduced weight loss (8.93 ± 0.38%), decay (34.26 ± 1.02%), and oxidative damage, while maintaining total soluble solids (4.4°Brix), pH (3.55 ± 0.09), and firmness (10.12 ± 0.15 N) after 35&#xa0;days of storage. These results demonstrate significantly higher efficacy than CMC-A and the control samples (<i>p &lt;</i> 0.05). Overall, the findings confirm the superior performance of electrostatically charged coatings, particularly CMC-B, in extending shelf life and preserving the physicochemical quality of tomatoes during storage.</p> Graphical Abstract <p></p>

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Comparative study on the efficacy of dip and electrostatic spray carboxymethyl cellulose orange peel extract coatings for improving postharvest quality and sensory attributes of tomato (Solanum lycopersicum)

  • 期刊论文

  • 发表日期：

    2026年2月13日

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  • Raj Rani,
  • Aamir Sohel,
  • Manoj Kumar Patel,
  • Manoj Kumar Nayak

摘要

A study was conducted to investigate the effect of sustainable coating materials on the quality and shelf life of tomatoes using an advanced electrostatic spray coating technique, in comparison to the conventional dip coating method. The experiments were performed at 25 ± 2 °C and 52 ± 3% relative humidity over a storage period of 35 days. Two composite coatings, designated as CMC-A and CMC-B, were prepared from carboxymethyl cellulose (CMC), polyvinyl alcohol (PVA), and orange peel extract (OPE) at ratios of 1.0:0.05:0 and 1.0:0.05:0.5 wt/v%, respectively. The antioxidant activity of the coatings was evaluated using the DPPH assay. Both CMC-A and CMC-B effectively delayed spoilage compared to uncoated controls. Significant charge-to-mass ratios of 1.65 mC/kg (CMC-A at 1.0 kV) and 1.23 mC/kg (CMC-B at 1.25 kV) were obtained at a 10 cm nozzle-to-Faraday cage distance and 4 bar air pressure, confirming the electrostatic chargeability of the coating formulations. Electrostatic spraying of CMC-B notably reduced weight loss (8.93 ± 0.38%), decay (34.26 ± 1.02%), and oxidative damage, while maintaining total soluble solids (4.4°Brix), pH (3.55 ± 0.09), and firmness (10.12 ± 0.15 N) after 35 days of storage. These results demonstrate significantly higher efficacy than CMC-A and the control samples (p < 0.05). Overall, the findings confirm the superior performance of electrostatically charged coatings, particularly CMC-B, in extending shelf life and preserving the physicochemical quality of tomatoes during storage.

Graphical Abstract