LAUSR

Citrus fruits (Rutaceae) are popularly grown all over the world and sub-divided into 78 species, with their distinctive and varied flavors (Texeira et al., 2005; Dkwi & Emenike, 2006). Fruit characteristics are one of the important parameters used for the selection of best genotypes for further propagations (Paudyal & Haq, 2008), and total soluble solid is an important economic index, especially with frozen concentrates (Rouse, 2000). Citrus fruits are mostly considered as acid fruits, since their soluble solids are composed mainly of organic acids and sugars (Kelebek et al., 2009). The acid content of juices is an important quality and maturity index (Song et al., 2016), and as with other fruit characteristics, it depends on fruit varieties, cultural practices and climate, amongst others (Burdurlu et al., 2006). Citrus fruits are also important because of their constituents with antioxidant potential, which have been investigated with different in-vitro assays such as DPPH radical scavenging activity (Zou et al., 2016). There are also anticancer (e.g. taxol), chemotherapic, antiviral, and anti-inflammatory components, and other bioactive constituents, which make citrus fruits valuable ingredients in functional foods (Osmail et al., 2004; Xu et al., 2008).