Abstract
Phenolic composition of different extracts of honeydew melon seeds and their antioxidant activity was determined for the first time. Phenolic compounds were identified using a reversed phase high performance liquid chromatography with diode array detection (HPLC-DAD) method. Results showed the identification of five phenolic compounds in water extract namely gallic acid and its derivative, hydroxybenzoic acid and catechin derivatives and caffeic acid. There were nine phenolic compounds identified in methanol–water extract, which are caffeic acid, two vanillic acid derivatives, ellagitanins, quercetin-3-rutinoside, derivatives of syringic acid and ellagic acid. The amounts of gallic acid, caffeic acid and catechin were higher among all phenolic compounds. Total phenolic compounds and radical scavenging activity were higher in water and methanol–water extract than their corresponding methanol extracts. In conclusion, melon seeds are a good source of natural antioxidants with significant biological functions and may serve as food ingredients and as fortifying material for maintaining shelf life.
Highlights
Honeydew melon (Cucumis melo L.) belongs to the family Cucurbitaceae and is a creamy yellowish oval shape fruit
Different extracts of honeydew melon seeds were analyzed for phenolic composition, total phenolic contents and antioxidant activity
The HPLC-DAD results revealed the identification of five phenolic compounds in water extracts, namely gallic acid and its derivative, hydroxybenzoic acid and catechin derivatives, and caffeic acid
Summary
Honeydew melon (Cucumis melo L.) belongs to the family Cucurbitaceae and is a creamy yellowish oval shape fruit. Honeydew melon is a widely used fruit from the Asian to the US market. The melon is rich in important vitamins, such as riboflavin, thiamine and folic acid [1]. It is a good source of pro-vitamin A and vitamin C [2]. The characteristic (Z,Z)-3,6-nonadien-1-ol and phenylethyl alcohol have imparted fresh and sweet-floral characters, respectively, to honeydew aroma [5]. The authors found that standard melon has the highest score in terms of taste because of its highest sweetness, high antioxidant activity, total phenolic and ascorbic acid contents
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