naa a22 4500 510725430 CHVBK 20180411082933.0 cr unu---uuuuu 180411e20131201xx s 000 0 eng 10.1007/s11947-012-1016-1 doi (NATIONALLICENCE)springer-10.1007/s11947-012-1016-1 Kinetic Modeling of Anthocyanin Extraction from Grape Marc [Elektronische Daten] [Voltaire Sant'Anna, Ligia Marczak, Isabel Tessaro] In the present work, kinetic studies of extraction of anthocyanins from grape marc were conducted in order to statistically evaluate several models presented in the literature. Based on a full 22 factorial design, extraction was performed using 50mL of ethanol, at a concentration of 50%, per gram of dry marc. Extraction was evaluated up to 120min in the temperature range of 60-25°C. A pseudo-first-order model provided the best description of extraction of anthocyanins. Yield and rate of extraction increased with increasing processing temperature, varying from 0.906 to 0.476mg cyanidin 3-glucoside per gram of dry marc and from 0.157 to 0.034min−1, respectively, in the temperature range. Results show that the highest yield of extraction happens after 15min at 60°C (activation energy of 29.5kJ mol−1), and that after 120min, thermal degradation has started. Springer Science+Business Media New York, 2012 Grape marc nationallicence Anthocyanins nationallicence Extraction nationallicence Kinetic modeling nationallicence MA : Monomeric anthocyanins nationallicence mg C3G g−1 db : Milligrams of cyanidin 3-glucoside per gram on dry basis nationallicence C 0 : Concentration of MA extracted at time zero (mg C3G g−1 db) nationallicence C : Concentration of MA extracted at time t (mg C3G g−1 db) nationallicence t : Time (in minutes) nationallicence k : Extraction rate constant (per minute) nationallicence m : Scale factor of the distribution curve in Eq.2 nationallicence a : Integration constant in Eq.3 nationallicence B and D : Extraction rate constants in Eq.4 nationallicence A and C : Constants in Eq.4 nationallicence C w ∞ : Equilibrium concentration of the swelling-washing process (mg C3G g−1 db) nationallicence C d ∞ : Equilibrium concentration of the diffusive process (mg C3G g−1 db) nationallicence k d : Extraction rate constant of the diffusive process (per minute) nationallicence k apar : Apparent extraction rate of the diffusive process (per minute) nationallicence t 1/2 : Half time of extraction of the swelling-washing process (in minutes) nationallicence K 1 : Extraction rate constant (per minute) nationallicence K 2 : Peleg's capacity constant nationallicence r 2 : Coefficient of determination nationallicence χ 2 : Chi-square nationallicence SEM : Standard error of mean nationallicence E a : Activation energy for extraction (in kilojoules per mole) nationallicence Sant'Anna Voltaire Laboratory of Food Technology and Processing, Chemical Engineering Department, Rio Grande do Sul Federal University, Porto Alegre, Brazil aut Marczak Ligia Laboratory of Food Technology and Processing, Chemical Engineering Department, Rio Grande do Sul Federal University, Porto Alegre, Brazil aut Tessaro Isabel Laboratory of Food Technology and Processing, Chemical Engineering Department, Rio Grande do Sul Federal University, Porto Alegre, Brazil aut Food and Bioprocess Technology Springer US; http://www.springer-ny.com 6/12(2013-12-01), 3473-3480 1935-5130 6:12<3473 2013 6 11947 https://doi.org/10.1007/s11947-012-1016-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11947-012-1016-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sant'Anna Voltaire Laboratory of Food Technology and Processing, Chemical Engineering Department, Rio Grande do Sul Federal University, Porto Alegre, Brazil aut NATIONALLICENCE 700 1- Marczak Ligia Laboratory of Food Technology and Processing, Chemical Engineering Department, Rio Grande do Sul Federal University, Porto Alegre, Brazil aut NATIONALLICENCE 700 1- Tessaro Isabel Laboratory of Food Technology and Processing, Chemical Engineering Department, Rio Grande do Sul Federal University, Porto Alegre, Brazil aut NATIONALLICENCE 773 0- Food and Bioprocess Technology Springer US; http://www.springer-ny.com 6/12(2013-12-01), 3473-3480 1935-5130 6:12<3473 2013 6 11947 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer