PHENOLIC PROFILES, TYROSINASE INHIBITORY, AND ANTIOXIDANT EFFECTS OF GREEN COFFEE, AND TURKISH TRADITIONAL COFFEE

Ş. Kanbolat, M. Badem, S. Şener, R. Aliyazicioglu
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Abstract

Coffee is the most widely consumed beverages worldwide. Coffee has been drunk for millennia due to their taste and health benefits. High levels of polyphenols, and especially flavonoids and phenolic acids, are found in coffee and contribute significantly to their flavor and health-giving properties. This study evaluated, the total phenolic contents, antioxidant, and tyrosinase inhibitor activities of green coffee, and Turkish traditional coffee extracts. Antioxidant activities of the coffees were examined by two different methods, radical 2,2-diphenyl-1-picrylhydrazyl (DPPH), and ferric reducing antioxidant power (FRAP). Total phenolic contents were estimated by using Folin-Ciocalteu reagent as gallic acid equivalent. The phenolic profiles were investigated by means of reverse phase-high performance liquid chromatography (RP-HPLC). This study investigated tyrosinase enzyme inhibitions against diphenolase (DOPA), using kojic acid as a positive control. The extracts exhibited high levels of antioxidant activities associated with significant antioxidant compound contents. The extracts exhibited high levels of tyrosinase inhibititory activity. The results show that green coffee especially from coffees can be regarded as a potential source of antioxidant compounds and tyrosinase inhibitors of significance in both the pharmaceutical and food industries.
绿咖啡和土耳其传统咖啡的酚类、酪氨酸酶抑制和抗氧化作用
咖啡是世界上消费最广泛的饮料。由于咖啡的味道和对健康的好处,人们已经喝了几千年了。咖啡中含有高含量的多酚,尤其是类黄酮和酚酸,这对咖啡的风味和有益健康的特性有很大的贡献。本研究评估了绿咖啡和土耳其传统咖啡提取物的总酚含量、抗氧化活性和酪氨酸酶抑制剂活性。采用2,2-二苯基-1-苦味酰肼自由基(DPPH)和铁还原抗氧化能力(FRAP)两种不同的方法检测咖啡的抗氧化活性。用Folin-Ciocalteu试剂作为没食子酸当量测定总酚含量。采用反相高效液相色谱法(RP-HPLC)对酚类成分进行了分析。本研究以曲酸为阳性对照,研究酪氨酸酶对二酚酶(DOPA)的抑制作用。提取物具有较高的抗氧化活性,抗氧化化合物含量显著。提取物具有较高的酪氨酸酶抑制活性。结果表明,生咖啡,特别是来自咖啡的生咖啡,可以被视为抗氧化化合物和酪氨酸酶抑制剂的潜在来源,在制药和食品工业中都有重要意义。
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