title: Physicochemical properties of tamarillo (Solanum betaceum Cav.) hydrocolloid fractions.
abstract: Tamarillo (Solanum betaceum Cav.) is an underutilised fruit in Malaysia. The fruit, however, contains good proportions of soluble fibre, protein, starch, anthocyanins and carotenoids. Amongst the fruits, only tamarillo mesocarp contains both polar (anthocyanins) and non-polar (carotenoids) pigments. The ability to retain both polar and non-polar pigments in the mesocarp could be related to the unique properties of its hydrocolloids. To understand the pigment-hydrocolloid interaction in the fruit, information on the physicochemical characteristics of the hydrocolloids is required. Therefore, hydrocolloids from the anthocyanin-rich seed mucilage fraction of the tamarillo and its carotenoid-rich pulp fraction were extracted and characterised. Water and 1% citric acid were used to extract the seed mucilage hydrocolloid while 72% ethanol and 20mM HEPES buffer were used for pulp hydrocolloid extraction. Seed mucilage hydrocolloid was primarily composed of arabinogalactan protein-associated pectin whereas pulp hydrocolloid was composed of hemicellulosic polysaccharides with some naturally interacting proteins and neutral polysaccharides.
authors.affiliation: Faculty of Food Science and Technology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia.
authors.forename: Sri Puvanesvari
authors.initials: SP
authors.lastname: Gannasin
authors.affiliation: Faculty of Food Science and Technology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia.
authors.forename: Noranizan Mohd
authors.initials: NM
authors.lastname: Adzahan
authors.affiliation: Radiation Processing Technology Division, Malaysian Nuclear Agency, Bangi, 43000 Kajang, Selangor Darul Ehsan, Malaysia.
authors.forename: Mohd Yusof
authors.initials: MY
authors.lastname: Hamzah
authors.affiliation: Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia.
authors.forename: Shuhaimi
authors.initials: S
authors.lastname: Mustafa
authors.affiliation: Faculty of Food Science and Technology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia. Electronic address: kharidah@upm.edu.my.
authors.forename: Kharidah
authors.initials: K
authors.lastname: Muhammad
mesh_terms: D000872:Anthocyanins / Q000032:analysis; D002338:Carotenoids / Q000032:analysis* / Q000737:chemistry; D003102:Colloids / Q000737:chemistry*; D005638:Fruit / Q000737:chemistry*; D011134:Polysaccharides / Q000737:chemistry*; D032322:Solanum / Q000737:chemistry*
chemical_list: D000872:Anthocyanins; D003102:Colloids; D011134:Polysaccharides; D002338:Carotenoids
keywords: Extraction; Hydrocolloid; Physicochemical properties; Pigments; Tamarillo