Structural collapse prevents β-carotene loss in a supercooled polymeric matrix
The kinetics of degradation and surface color changes of β-carotene encapsulated in a polymeric matrix (PVP-40) and its relationship with physical changes (manifested as structural collapse) of the matrix were studied during storage of samples at several water activities at constant temperature. The...
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| Formato: | Capítulo de libro |
| Lenguaje: | Inglés |
| Publicado: |
2006
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| LEADER | 10709caa a22010937a 4500 | ||
|---|---|---|---|
| 001 | PAPER-7341 | ||
| 003 | AR-BaUEN | ||
| 005 | 20230518203705.0 | ||
| 008 | 190411s2006 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-31044451079 | |
| 024 | 7 | |2 cas |a beta carotene, 7235-40-7; Polymers; beta Carotene, 7235-40-7 | |
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 030 | |a JAFCA | ||
| 100 | 1 | |a Prado, S.M. | |
| 245 | 1 | 0 | |a Structural collapse prevents β-carotene loss in a supercooled polymeric matrix |
| 260 | |c 2006 | ||
| 270 | 1 | 0 | |m Buera, M.P.; Departamento de Industrias, Facultad Ciencias Exactas Y Naturales, 1428 Ciudad Universitaria, Buenos Aires, Argentina; email: pilar@di.fcen.uba.ar |
| 506 | |2 openaire |e Política editorial | ||
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| 520 | 3 | |a The kinetics of degradation and surface color changes of β-carotene encapsulated in a polymeric matrix (PVP-40) and its relationship with physical changes (manifested as structural collapse) of the matrix were studied during storage of samples at several water activities at constant temperature. The degradation rate constants obtained decreased with an increase in the relative humidity (RH) of the storage atmosphere. β-Carotene losses were observed mainly at RHs below the glass transition temperature (Tg) of the corresponding systems, and the lower degradation constant rates were observed under conditions where the matrices were fully plasticized (i.e., rubbery) and collapsed (RH, 64 and 75%). An inverse correlation was observed between collapse and degradation rate constants. The results presented here indicated that the molecular mobility of the matrix is not rate limiting for the degradation of β-carotene. Factors such as microstructure and porosity of the polymeric matrix may be more important as modifiers of kinetic reactions. Surface color was not a sensitive indicator of β-carotene retention, because it was mostly affected by the degree of matrix hydration and collapse phenomena. © 2006 American Chemical Society. |l eng | |
| 593 | |a Departamento de Industrias, Facultad Ciencias Exactas Y Naturales, 1428 Ciudad Universitaria, Buenos Aires, Argentina | ||
| 690 | 1 | 0 | |a Β-CAROTENE |
| 690 | 1 | 0 | |a COLLAPSE |
| 690 | 1 | 0 | |a ENCAPSULATION |
| 690 | 1 | 0 | |a GLASS TRANSITION |
| 690 | 1 | 0 | |a MOLECULAR MOBILITY |
| 690 | 1 | 0 | |a BETA CAROTENE |
| 690 | 1 | 0 | |a POLYMER |
| 690 | 1 | 0 | |a ARTICLE |
| 690 | 1 | 0 | |a CHEMISTRY |
| 690 | 1 | 0 | |a COLD |
| 690 | 1 | 0 | |a HUMIDITY |
| 690 | 1 | 0 | |a KINETICS |
| 690 | 1 | 0 | |a PHYSICAL CHEMISTRY |
| 690 | 1 | 0 | |a BETA CAROTENE |
| 690 | 1 | 0 | |a CHEMISTRY, PHYSICAL |
| 690 | 1 | 0 | |a COLD |
| 690 | 1 | 0 | |a HUMIDITY |
| 690 | 1 | 0 | |a KINETICS |
| 690 | 1 | 0 | |a POLYMERS |
| 650 | 1 | 7 | |2 spines |a COLOR |
| 650 | 1 | 7 | |2 spines |a COLOR |
| 700 | 1 | |a Buera, M.P. | |
| 700 | 1 | |a Elizalde, B.E. | |
| 773 | 0 | |d 2006 |g v. 54 |h pp. 79-85 |k n. 1 |p J. Agric. Food Chem. |x 00218561 |w (AR-BaUEN)CENRE-101 |t Journal of Agricultural and Food Chemistry | |
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