Antimicrobial activities of flavedo peel extract and its feasibility in the development of bio‐based pectin coating film for fruit preservation

Abstract

The pomelo flavedo extract (PFE) from the pomelo peel (an agricultural waste) is well known with many functional properties. In this study, the incorporation of PFE into the bio-based polymer (pectin) for the formulation of the coating film was generally developed. The PFE showed a very high inhibitory effect against Pseudomonas aeruginosa (9.22 ± 0.37 mm of inhibition zone diameter), whereas Escherichia coli was found to be resistant to the PFE treatment. The incorporation of varying PFE contents into the pectin film with glycerol as a plasticizer for developing PFE-Gly-Pectin composite film and its effect on the film performance was investigated. PFE was found to reduce the swelling degree and increase the solubility of the Gly-Pectin film as well as increase the flexibility of the resulting film. However, the molecular structure, structural morphology, and contact angle of the Gly-Pectin film were insignificantly affected by the presence of PFE. The composite film at the PFE:Pectin ratio of 3.4 g/g was selected for the preliminary preservation of jackfruit bulbs which was stored at ambient temperature. As a result, coated jackfruit bulbs appeared to maintain a better quality after 3 days with an alleviated change in weight loss, color parameters, and total soluble solids, whereas the uncoated jackfruits showed signs of spoilage on Day 2 of the storage period. Therefore, the PFE conjugated pectin film suggested potential in the preservation of food materials.

Recycling of wheat gluten wastewater: Recovery of arabinoxylan and application of its film in cherry and strawberry preservation

“…Following water loss, the decline in strawberries' quality is accompanied by a significant impairment of their physiological metabolism and appearance quality ( Yang et al, 2022 ). The application of WEAX coating liquid results in the formation of a transparent film on the strawberry's surface ( Nhi et al, 2022 ). This film effectively hinders the respiration and transpiration processes, thereby mitigating water and nutrient loss, and reducing the weight loss of strawberries.…”

Preharvest Foliar Spraying Combined with Postharvest Salicylic Acid Treatment Regulates Panzao (Ziziphus jujuba Mill. cv. ‘Jingcang1’) Fruit Quality and Softening during Storage

“…Several crop storage and preservation methods, including fumigation (i.e., the use of gas to inhibit or kill pathogenic microorganisms on the surface of fruits and vegetables; the gases penetrate into the fruit and alter its physiology across multiple scales) [2], gas conditioning (i.e., placing fresh dates in a specific gas-conditioning storage facility with cold storage; achieved by adjusting the concentration of O 2 and CO 2, and other gases in the storage environment to attain preservation) [3], chemical preservatives (i.e., entails the application of chemicals that inhibit microbial reproduction and slow fruit metabolic functions) [4], and film coating (i.e., coating fruit surfaces with a polymer liquid film layer, creating a selective moisture and gas barrier that slows the deterioration of the fruit by slowing down the physiological processes of the fruits and inhibiting microbial processes) [5] have been used to prolong the storage time and improve fruit quality. In addition, some preharvest treatments, such as spraying with foliar fertilizers and growth regulators, have been investigated.…”