DEVELOPMENT OF VALUE-ADDED PRODUCTS FROM LOW-GRADE POMELO: A STRATEGY FOR WASTE REDUCTION AND INCOME GENERATION IN SAMUT SONGKHRAM, THAILAND

Abstract

This research addresses the critical issue of post-harvest losses and market surplus of low-grade pomelo (Citrus maxima) in Samut Songkhram Province, a key agricultural region in Thailand. The study employed a product development framework to transform underutilized pomelo into high-value consumer goods, thereby creating economic opportunities for local farmers. Three distinct product lines were developed: 1) Candied Pomelo Fortified with Natural Herbal Extracts (Butterfly Pea, Beetroot, Pandan), 2) Ready-to-Eat Pomelo Salad (Yum Som-O), and 3) Pomelo Peel Marmalade. Through iterative formulation and rigorous sensory evaluation using a 9-point hedonic scale (n=30 untrained panelists), optimal recipes were identified. The candied pomelo with butterfly pea extract achieved the highest sensory scores (Overall Liking: 8.20). The ready-to-eat pomelo salad (Formula 1) demonstrated a refrigerated shelf-life of 7 days, with peak quality at 3 days. For the marmalade, a 10% pomelo peel incorporation rate was found to be optimal, receiving significantly higher acceptance (p≤0.05) than other levels. The project culminated in a technology transfer workshop for the Bang Sakae farmer group. The findings demonstrate a successful model for agricultural waste valorization, promoting a circular economy, enhancing food security, and supporting sustainable community development through the creation of market-driven, innovative products.