Study of the extraction of bioactive compounds from pomelo (Citrus maxima)pith and applying it to drinking products

Abstract This study aimed to identify the suitable parameters for extracting biological compounds from pomelo pith. Survey factors included solvent types (ethanol 80° and water), extraction temperature (70℃, 80℃, and 90℃), material size (2 mm, 3 mm, and 5 mm), time extraction (60 mins, 90 mins, and 120 mins), material: solvent ratio (1:8, 1:9 and 1:10 w/w). The optimal parameters for the extraction process from pomelo pith have been determined, including solvent as ethanol 80°, extraction temperature as 70℃, material size as 3 mm, material: solvent ratio as 1:8 w/w, and extraction time as 60 mins. The obtained pomelo pith extract had a Brix value of 72 and an extract moisture content of 23.876%. The naringin, polyphenol content, and antioxidant activity according to DPPH were 8.5 mg/g, 28.137 mgGAE/g dry matter, and 246.989 mg acid ascorbic equivalent/100-gram dry matter, respectively. The extracted product was then mixed with herbs to form a drink product. The mixing ratio of pomelo pith extract/herbal extract and product pasteurization time (5-20 mins) has been investigated. The percentage of mixing extract and other ingredients such as ginger, licorice, sugar, and water were determined as 5%, 2.5%, 5%, 20%, and 67.5% (% by weight), respectively. After pasteurization for 15 mins at 100℃, the product has retained its original state without sediment.