Citrus is one of the most important fruit crops since antiquity and is a good source of vitamin-C with high antioxidant potential (Gorinstein et al. 2004). Currently, citrus is cultivated in the subtropical and tropical regions of the world between 40 North and 40 South latitude in 137 countries spread over six continents and generates about 105 billion US dollar per year in the world fruit market (Ismail and Zhang, 2004). Annually, more than 104 million tonnes of citrus are produced and about 15 million tonnes are traded (FAO, 2004). The main citrus producing countries are Brazil and USA....