title: Accumulation of all-trans-beta-carotene and its 9-cis and 13-cis stereoisomers during postharvest ripening of nine Thai mango cultivars.
abstract: Accumulation of beta-carotene during postharvest ripening of nine Thai mango cultivars was assessed after verifying extraction and high-performance liquid chromatographic quantification of the beta-carotene stereoisomers for this sample matrix. No relevant trans-cis isomerization was induced by the analytical procedure. The vitamin A potential of mangoes was evaluated at different ripening stages unequivocally defined by a ripening index (RPIWB). Being rather stable throughout postharvest ripening, the cultivar-specific proportion of cis-beta-carotene isomers ranged from 14 to 40% of the total beta-carotene content. Subjected to the same postharvest ripening conditions, only the cultivars Kaew, Maha Chanok, Chok Anan, and Nam Dokmai #4 developed a bright yellow-orange mesocarp coloration at their fully ripe stage (RPIWB = 1.5-1.8, sugar-acid ratio approximately 50), resulting in total beta-carotene contents of 6544-11249 microg/100 g mesocarp dry weight (DW) and vitamin A values of 892-1573 retinol equivalents (RE)/100 g DW. Contrarily, poor-colored cultivars Mon Duen Gao, Rad, Kiew Sawoei, Okrong Kiew, and Okrong Thong reached total beta-carotene contents of 1019-2195 microg/100 g DW and vitamin A values of 136-298 RE/100 g DW at comparable sugar-acid ratios. Exponential development of mesocarp color (hue angle, H degrees ) and all-trans-beta-carotene levels, respectively, with RPIWB was described for each cultivar, allowing good prediction of mesocarp color and vitamin A value at consumption ripeness.
authors.affiliation: Institute of Food Technology, Section Plant Foodstuff Technology, Hohenheim University, August-von-Hartmann-Strasse 3, 70599 Stuttgart, Germany.
authors.forename: Ana Lucía
authors.initials: AL
authors.lastname: Vásquez-Caicedo
authors.forename: Pittaya
authors.initials: P
authors.lastname: Sruamsiri
authors.forename: Reinhold
authors.initials: R
authors.lastname: Carle
authors.forename: Sybille
authors.initials: S
authors.lastname: Neidhart
mesh_terms: D002851:Chromatography, High Pressure Liquid; D005638:Fruit / Q000737:chemistry* / Q000254:growth & development*; D031022:Mangifera; D013237:Stereoisomerism; D013997:Time Factors; D019207:beta Carotene / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism*
chemical_list: D019207:beta Carotene