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    Development of gelatin/agarose active coatings functionalized with Ocimum gratissimum L. essential oil for enhancing storability of ‘Booth 7’ avocado

    Year: 2023

    Journal: International Journal of Biological Macromolecules, Volume 253, 2023-12-31, page 127516

    Authors: Pham, Bao-Tran Tran; Hoang, Hong-Nhung Thi; Trinh, Chinh Dung; Bui, Quynh Thi Phuong; Phung, Thanh Khoa; Nguyen, Thuong Thi

    Keywords: Active coating; Avocado preservation; Gelatin/agarose; L. essential oil; Mechanical behavior

    Novel active coating from gelatin/agarose (GA) functionalized with Ocimum gratissimum L. essential oil (OGO) had been developed as a medium to evaluate their properties before being applied for avocado preservation. The resultant coating films showed enhanced mechanical, water-barrier, bactericidal, antioxidant, and UV-shielding properties by adding OGO. The best tensile strength (2.91 MPa) and flexibility (45.82 %) was found in the GA film containing 5 % (w/w) of OGO (GA-OGO-5). Furthermore, this coating formulation presented moderate antibacterial activities against Listeria, Pseudomonas, Salmonella, and Escherichia. The GA-OGO-5 coating film also divulged the highest hydrophobicity and adequate antioxidant function (30.75 μg/mL) and thus, was chosen to coat on ‘Booth 7’ avocados by dipping method. The GA-OGO-5 coating layers were to be efficient to decline the respiration rate of avocado during 6-day storage at 25 °C and 64 %RH. Peel color, weight loss (5.22 %), total soluble solids (8.14 %), and solution pH (6.79) at the end of storage also indicated that the GA-OGO-5 coating presented the best effectiveness for enhancing the storability of avocado as compared to uncoated and GA-treated fruit. Therefore, the GA-OGO coating has been considered as an alternative post-harvest technique to enhance the avocado storability and could be further commercialized for industry application.
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