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<p>Bacterial nanocellulose (BNC), an edible biopolymer, offers a sustainable material for functional film and coating applications. In this study, a high-pressure-homogenized BNC suspension was developed as a biopolymer-based coating matrix incorporated with potassium sorbate (KS) for postharvest quality retention under non-refrigerated conditions typical of Southeast Asian wet markets. The physicochemical behavior and film-forming ability of BNC enabled the formation of a thin coating layer on the leaf surface, providing moisture retention. Sweet basil (<i>Ocimum basilicum</i> L.), a green leafy herb with a limited postharvest shelf life due to its high respiration and transpiration rates, was treated with BNC suspensions at varying concentrations (0.1–0.3% w/v), with and without KS (0.05–0.15% w/v), and evaluated for quality attributes after storage for 6, 24, and 48&#xa0;h at 25 ± 1&#xa0;°C and 62 ± 1% RH. The BNC–KS biopolymer film (0.3% w/v BNC supplemented with 0.1% w/v KS) significantly enhanced weight, color, chlorophyll, and antioxidant retention compared with untreated samples, maintaining up to 66.1% weight and 77.5% chlorophyll after 48&#xa0;h. The BNC suspensions exhibited good physical stability during storage at 35&#xa0;°C for 30 days. The optimal acid-base conditions of BNC suspensions to maintain basil leaf quality were within the pH range of 6–7. This finding demonstrates the potential of BNC-based biopolymer films as functional, eco-friendly coatings for maintaining the freshness of perishable produce, particularly under ambient conditions in wet markets and non-refrigerated supply chains.</p>

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Bacterial nanocellulose–potassium sorbate biopolymer film as functional coating for quality retention of postharvest sweet basil

  • 期刊论文

  • 发表日期：

    2026年3月23日

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  • Thatchaphon Anuchitworawong,
  • Tanawut Hankum,
  • Duangdao Aht-Ong,
  • Kanogwan Seraypheap,
  • Kamonwan Pacaphol

摘要

Bacterial nanocellulose (BNC), an edible biopolymer, offers a sustainable material for functional film and coating applications. In this study, a high-pressure-homogenized BNC suspension was developed as a biopolymer-based coating matrix incorporated with potassium sorbate (KS) for postharvest quality retention under non-refrigerated conditions typical of Southeast Asian wet markets. The physicochemical behavior and film-forming ability of BNC enabled the formation of a thin coating layer on the leaf surface, providing moisture retention. Sweet basil (Ocimum basilicum L.), a green leafy herb with a limited postharvest shelf life due to its high respiration and transpiration rates, was treated with BNC suspensions at varying concentrations (0.1–0.3% w/v), with and without KS (0.05–0.15% w/v), and evaluated for quality attributes after storage for 6, 24, and 48 h at 25 ± 1 °C and 62 ± 1% RH. The BNC–KS biopolymer film (0.3% w/v BNC supplemented with 0.1% w/v KS) significantly enhanced weight, color, chlorophyll, and antioxidant retention compared with untreated samples, maintaining up to 66.1% weight and 77.5% chlorophyll after 48 h. The BNC suspensions exhibited good physical stability during storage at 35 °C for 30 days. The optimal acid-base conditions of BNC suspensions to maintain basil leaf quality were within the pH range of 6–7. This finding demonstrates the potential of BNC-based biopolymer films as functional, eco-friendly coatings for maintaining the freshness of perishable produce, particularly under ambient conditions in wet markets and non-refrigerated supply chains.