Kamran Ghasemi, Yosef Ghasemi, Mohammad Ali Ebrahimzadeh.
Antioxidant activity, phenol and flavonoid contents of 13 citrus species peels and tissues.
Pak J Pharm Sci Jan ;22(3):277-81.

Methanolic extracts of 13 commercially available citrus spp., peels and tissues growing in Iran were investigated for their antioxidant activity by DPPH method. IC50 for antioxidant activity ranged from 0.6-3.8 mg ml-1. Total phenolic content of the citrus spp. samples (based on folin Ciocalteu method) varied from 66.5 to 396.8 mg gallic acid equivalent/g of extract and flavonoids content (based on colorimetric AlCl3 method) varied from 0.3 to 31.1 mg quercetin equivalent/g of extract. There were no correlation between the total phenolic and/ or flavonoids contents and antioxidant activity in tissues and/or peels.

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