title: Factors that impact the stability of vitamin C at intermediate temperatures in a food matrix.
abstract: The study comprises a systematic and quantitative evaluation of potential intrinsic and extrinsic factors that impact vitamin C degradation in a real food matrix. The supernatant of centrifuged apple purée was fortified in vitamin C, and degradation was followed without stirring. Model discrimination indicated better fit for the zero order model than the first order model which was hence chosen for determination of rate constants. pH influenced strongly vitamin C degradation in citrate-phosphate buffer but not in the apple purée serum. To get an idea of the impact of the food matrix, stability in apple purée serum was compared with that in carrot purée. In the latter, stability was slightly higher. Vitamin C degradation rates were not influenced by its initial concentration. The temperature effect was only marked in the temperature range 40-60°C. In the range 60-80°C, filling height of tubes had the greatest impact.
authors.affiliation: UMR 408 SQPOV «Sécurité et Qualité des Produits d'Origine Végétale», INRA, Université d'Avignon et des Pays du Vaucluse, F-84000 Avignon, France.
authors.forename: Anna-Lena
authors.initials: AL
authors.lastname: Herbig
authors.affiliation: UMR 408 SQPOV «Sécurité et Qualité des Produits d'Origine Végétale», INRA, Université d'Avignon et des Pays du Vaucluse, F-84000 Avignon, France. Electronic address: catherine.renard@inra.fr.
authors.forename: Catherine M G C
authors.initials: CM
authors.lastname: Renard
mesh_terms: D001205:Ascorbic Acid / Q000032:analysis / Q000737:chemistry*; D018552:Daucus carota / Q000737:chemistry*; D005503:Food Additives / Q000737:chemistry; D005511:Food Handling / Q000379:methods*; D006801:Humans; D027845:Malus / Q000737:chemistry*; D013696:Temperature; D014815:Vitamins / Q000032:analysis / Q000737:chemistry*
chemical_list: D005503:Food Additives; D014815:Vitamins; D001205:Ascorbic Acid
keywords: Apple purée serum; Dehydroascorbic acid; Fortification; Surface-to-volume ratio; Vitamin C degradation