Bioactive compounds and antioxidant capacity of pink pummelo (Citrus grandis (L.) Osbeck) cv. 'Thong Dee' in Thailand
2010
Chaiwong, S. | Theppokorn, T., Mae Fah Luang Univ., 333 Moo. 1, Tasud, Muang, Chiang Rai 57100 (Thailand). School of Agro-Industry
The pink pummelos cv. 'Thong Dee' (Citrus grandis (L). Osbeck) at 80% maturity were harvested from Chiang Rai (CR), Nakhon Pathom (NP), Nakhon Nayok (NY), Prachin Buri (PB), and Nakhon Si Thammarat (NST) provinces [Thailand] for consuming in domestic market. The contents of vitamin C, total phenolic compounds and seven flavonoids were determined. The total antioxidant capacities were also determined by both the 2,2-diphenyl-1-picryhydrazyl (DPPH) assay and ferric reducing antioxidant power (FRAP) assay. The highest contents of vitamin C (74.63 mg/100 ml) and total phenolic compounds (94.93 mgGAE/100 fresh weight) were found in pummelos fromn NST and CR, respectively. Naringin was the major flavonoid compounds in pummelo and had the highest content in sample from NST (71.90 mg/100 g fresh weight). The highest antioxidant capacities (DPPH-assay) were found in pummelo from NST and CR whereas there was no significant differences among samples in FRAP-assay. Overall, pummelo from NP had the lowest vitamin C (32.94 mg/100 ml), total phenolic compounds (54.87 mgGAE/100 g fresh weight), and antioxidant capacity (DPPH-assay) (164.33 micro mol Trolox/100 g fresh weight).
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