Abstract
Objectives: Antioxidant activity was studied in naturally dried seed extract and hot air oven dried extract of Actinidia deliciosa and Psidium guajava using ferric reducing antioxidant power (FRAP) assay method.
 Methods: The dried powdered seed of A. deliciosa and P. guajava 10 g was dissolved in 100 ml of ethanol in four different conical flasks S1 (for naturaly dried seeds of A. deliciosa), S2 (for hot air oven-dried seeds of A. deliciosa), S3 (for naturally dried seeds of P. guajava), and S4 (for hot air oven-dried seeds of P. guajava). The extract was carried out in shaker at 120 rpm for 72 h at room temperature by mild shaking. The extract was taken out and centrifuged at 4000 rpm for 10 min, the supernatant was taken out. The supernatant was placed in a water bath at 95°C for the solvent to evaporate and stored at room temperature.
 Results: According to the FRAP results, P. guajava which was naturally dried and extracted has shown the highest antioxidant activity (sample 3) then followed by the samples S4, S1, and S2. The least activity is observed in the sample (S2).
 Conclusion: By comparing the antioxidant activity between the A. deliciosa and P. guajava with the help of FRAP assay results, P. guajava has the highest amount of vitamin C (responsible for antioxidant activity) when compared to that of the A. deliciosa.
Highlights
Actinidia deliciosa (Kiwi fruit) is said to be a dietary powerhouse because of the presence of proteins, fats, carbohydrates, minerals, vitamins, and natural fiber [1]
Kiwi is rich in Vitamin C which is responsible for its antioxidant activity
Antioxidant activity study provides original data on the compositional profile and antioxidant capacity of kiwifruit grown in five orchards of the largest Italian production area (Lazio region)
Summary
Actinidia deliciosa (Kiwi fruit) is said to be a dietary powerhouse because of the presence of proteins, fats, carbohydrates, minerals, vitamins, and natural fiber [1]. Kiwifruits are the simplest fruit containing the actinidin enzyme, making them particular and an absolute have to have for your daily fruit basket [2]. These fruits are responsible for controlling blood sugar because it is characterized by a low glycemic index. Data on macronutrients (moisture, protein, lipid, and carbohydrate), starch, total dietary fiber, oxalic acid, organic acids, minerals, trace elements, and bioactive molecules, including ascorbic acid, total polyphenols, carotenoids (lutein and ß-carotene), and tocols (α-tocopherol, γ-tocopherol, and γ-tocotrienol) content are reported. Antioxidant activity positively correlated with hydrophilic molecules content mostly with ascorbic acid (r=0.97), suggesting Vitamin C as the major contributor to the total antioxidant activity in kiwifruit [4]
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