DefinePK

Abstract

Pink guava (Psidium guajava L.) is a tropical fruit rich in high-profile nutrients such as polyphenols, which act as antioxidants. After processing pink guavas for fruit juice, the residual pulp still contains a large amount of polyphenols. Our previous study indicated that the total polyphenol content of residual pulp pink guava after processing ranged 0.03 to 0.12 mg/g. The aim of present study is to find the best solvent for the extraction of polyphenols. The highest total polyphenol content was obtained using methanol as a solvent and the second highest was obtained using water as a solvent. A mixture of methanol and water at a ratio of 60% increased the total polyphenol content. The best extraction time was 180 minutes and a ratio of 1 g of pulp waste to 25 ml of 60% methanol/water solvent yielded the highest polyphenol content. The Folin-Ciocalteau method was used to determine the total polyphenol content.