Valorisation of pomegranate waste: A sustainable approach to harnessing natural antioxidants

Q1 Environmental Science

Bioresource Technology Reports Pub Date : 2025-06-19 DOI:10.1016/j.biteb.2025.102178

Nadia Shahbazi, Ali Azizi, Mohammad Sayyari, Forouh Sadat Seyedi, Seyyed Hossein Pourhosseini

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Abstract

Agricultural waste, particularly pomegranate peel, is a significant environmental issue due to its high phenolic content and the disposal problems associated with byproducts like peels and seeds from juice production. This study investigates the phytochemical properties of peels and seeds from eight Iranian pomegranate cultivars. Results show that white-skinned cultivars are especially rich in phenols and tannins, making them promising sources of natural antioxidants for the food and pharmaceutical industries. The sweet white (SW) and sour white (OW) cultivars showed the highest total phenol (796–805 mg GAE/100 g FW), flavonoid (12.7–12.8 mg Ru/100 g FW), and tannin content (145–148 mg TAE/100 g FW), with antioxidant activity 9–129 % higher than in red-, yellow-, and black-skinned cultivars. These findings suggest pomegranate peels, particularly from white cultivars, are a valuable resource for medicinal and nutritional applications in biorefineries.

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石榴废物的增值：利用天然抗氧化剂的可持续方法

农业废弃物，特别是石榴皮，是一个重大的环境问题，因为它的酚含量高，而且与果汁生产过程中的果皮和种子等副产品有关的处理问题。本文研究了8个伊朗石榴品种的果皮和种子的植物化学性质。结果表明，白皮品种尤其富含酚类和单宁，使其成为食品和制药工业天然抗氧化剂的有希望的来源。甜白（SW）和酸白（OW）品种的总酚（796 ~ 805 mg GAE/100 g FW）、类黄酮（12.7 ~ 12.8 mg Ru/100 g FW）和单宁含量（145 ~ 148 mg TAE/100 g FW）最高，抗氧化活性比红皮、黄皮和黑皮品种高9 ~ 129%。这些发现表明石榴皮，特别是来自白色品种的石榴皮，是生物炼制中药用和营养应用的宝贵资源。

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