ABSTRACT Polyphenols are natural antioxidants and play a very vital role in inhibition of oxidative stress as induced by free radicals in the body. Apple and pomegranate peels are significant agro-industrial wastes. The waste could be utilized to extract polyphenols for processing various functional foods and nutraceuticals. An investigation was executed for extraction of polyphenols from apple and pomegranate peels by sonication and maceration. Three different polar solvents: methanol, ethanol, and acetone were used in the study at two different concentrations (50% and 75%). Yield (%), total polyphenolic content (TPC), total flavonoid content (TFC), and 1,1-diphenyl-2-picryl-hydrazyl (DPPH) radical scavenging assay were performed. The extracts were then utilized in processing functional date bars with 2% and 3% concentrations. The results from the current study articulated that extraction from sonication yields higher quantity of polyphenols than that of maceration technique. The highest polyphenols were extracted at acetone 75% (44.71 mg GAE/g) in apple peel and at methanol 50% (72.21 mg GAE/g) in pomegranate peel. The results also revealed that pomegranate peel has higher polyphenols and greater radical scavenging activity as compared to apple peel. It was concluded that apple and pomegranate peel polyphenolic extract fortified date bars could be utilized as a preventive therapeutic agent against certain oxidative stress degenerative diseases.

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使用不同的提取技术从苹果和石榴皮中提取多酚以开发功能性枣条

摘要 多酚是天然抗氧化剂，在抑制体内自由基引起的氧化应激方面起着非常重要的作用。苹果皮和石榴皮是重要的农业工业废物。废物可用于提取多酚，用于加工各种功能性食品和保健品。进行了一项通过超声处理和浸渍从苹果和石榴皮中提取多酚的研究。三种不同的极性溶剂：甲醇、乙醇和丙酮以两种不同的浓度（50% 和 75%）用于研究。进行了产率 (%)、总多酚含量 (TPC)、总黄酮含量 (TFC) 和 1,1-二苯基-2-苦基-肼 (DPPH) 自由基清除试验。然后将提取物用于加工浓度为 2% 和 3% 的功能枣条。当前研究的结果表明，与浸渍技术相比，超声提取产生的多酚含量更高。最高的多酚在苹果皮中的丙酮 75% (44.71 mg GAE/g) 和石榴皮中的甲醇 50% (72.21 mg GAE/g) 中提取。结果还表明，与苹果皮相比，石榴皮具有更高的多酚含量和更强的自由基清除活性。得出的结论是，苹果和石榴皮多酚提取物强化枣条可用作某些氧化应激退行性疾病的预防治疗剂。71 mg GAE/g) 在苹果皮中和在甲醇中 50% (72.21 mg GAE/g) 在石榴皮中。结果还表明，与苹果皮相比，石榴皮具有更高的多酚含量和更强的自由基清除活性。结论是，苹果和石榴皮多酚提取物强化枣条可用作某些氧化应激退行性疾病的预防治疗剂。71 mg GAE/g) 在苹果皮中和在甲醇中 50% (72.21 mg GAE/g) 在石榴皮中。结果还表明，与苹果皮相比，石榴皮具有更高的多酚含量和更强的自由基清除活性。得出的结论是，苹果和石榴皮多酚提取物强化枣条可用作某些氧化应激退行性疾病的预防治疗剂。