Bioactive pectin film from pomelo peels and its application on tomato coating

Pomelo is a citrus fruit that is considered as the specialty of Nakhon Pathom province. With the large volume of production and consumption of this fruit, a high quantity of pomelo peel is generated. The peel accounts for about 30% of the total fruit weight and is currently discarded as agricultural...

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Bibliographic Details
Main Authors: Trasri, Nattariya, Pruksasri, Suwattana
Format: Conference Proceeding
Language:English
Subjects:
Agricultural wastes
Biocompatibility
Biological activity
Biomedical materials
Citric acid
Citrus fruits
Essential oils
Esterification
Flavonoids
Gallic acid
Glycerol
Pectin
Shelf life
Tomatoes
Weight loss
Weight reduction
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Summary:Pomelo is a citrus fruit that is considered as the specialty of Nakhon Pathom province. With the large volume of production and consumption of this fruit, a high quantity of pomelo peel is generated. The peel accounts for about 30% of the total fruit weight and is currently discarded as agricultural waste. However, it contains many valuable substances, e.g. flavonoids, essential oils, and pectin. Therefore, the aim of this work was to utilize pomelo peel as a bioactive material to form edible films with antioxidant properties in order to extend the shelf life of tomatoes. Firstly, pectin was extracted from the spongy white peel of pomelo using 1.0 M citric acid solution at 90 °C for 30 min. The methoxyl content and the degree esterification (DE) of the extracted pomelo peel pectin were 13.6 ± 0.2 and 71.4 ± 3.4%, respectively. This obtained pectin can be classified as a high methoxyl type due to a high DE value. The film was formed by mixing the extract solution with glycerol at different ratios ranging from 0-6% of total volume. The total phenolic contents of all films were in the range of 1.26-1.68 mg gallic acid equivalents/g dry film. The tomatoes were coated with the pectin films by an immersion technique and the resulting water losses in the fruits as an indicator to measure the quality of the product were determined. The results show that the weight loss of tomatoes coated with a film containing 1% glycerol was lower than that of a control (without coating). It could be concluded that pomelo peel extract could be used to make bioactive films with the reduced weight loss property.
ISSN:0094-243X
1551-7616
DOI:10.1063/5.0120991