INVESTIGADORES
ROJAS Ana Maria Luisa
artículos
Título:
Development of a High Methoxyl-Pectin Edible Film for Retention of L-(+)-Ascorbic Acid.
Autor/es:
PEREZ, CAROLINA DAIANA; FLORES, SILVIA KARINA; MARANGONI, ALEJANDRO G.; GERSCHENSON, LÍA NOEMÍ; ROJAS, ANA M.
Revista:
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Editorial:
AMER CHEMICAL SOC
Referencias:
Lugar: USA; Año: 2009 vol. 57 p. 6844 - 6855
ISSN:
0021-8561
Resumen:
An edible film to carry L-(þ)-ascorbic acid (AA) was formulated for natural antioxidant food
protection. Considering previous works where films based on the rigid structure of gellanL-(þ)-ascorbic acid (AA) was formulated for natural antioxidant food
protection. Considering previous works where films based on the rigid structure of gellan
(deacylated) or on a mixture of acylated-deacylated (more disordered) gellan were used for
network development, pectin was herein chosen by considering that the alternating presence of
disordered (hairy) regions together with ordered (homogalacturonan) ones could sufficiently
immobilize water for better AA retention and lower browning. High methoxyl pectin (HMP) was first
investigated. AA stability and browning were studied during film storage at 33.3, 57.7, or 75.2%
relative humidity (RH) and 25 C; their dependence on water mobility determined through 1H NMR
analysis as well as the correlation between browning and AA degradation were again found.
Network characteristics and glycerol (plasticizer) interactions were analyzed through X-ray diffraction
and Fourier transform infrared spectroscopy as well as through uniaxial tensile assay. From all
results obtained, it was hypothesized that browning development in solidlike systems may be
directly related to the water molecules more closely adsorbed on the hydroxyl-polymeric (active)deacylated) or on a mixture of acylated-deacylated (more disordered) gellan were used for
network development, pectin was herein chosen by considering that the alternating presence of
disordered (hairy) regions together with ordered (homogalacturonan) ones could sufficiently
immobilize water for better AA retention and lower browning. High methoxyl pectin (HMP) was first
investigated. AA stability and browning were studied during film storage at 33.3, 57.7, or 75.2%
relative humidity (RH) and 25 C; their dependence on water mobility determined through 1H NMR
analysis as well as the correlation between browning and AA degradation were again found.
Network characteristics and glycerol (plasticizer) interactions were analyzed through X-ray diffraction
and Fourier transform infrared spectroscopy as well as through uniaxial tensile assay. From all
results obtained, it was hypothesized that browning development in solidlike systems may be
directly related to the water molecules more closely adsorbed on the hydroxyl-polymeric (active)(hairy) regions together with ordered (homogalacturonan) ones could sufficiently
immobilize water for better AA retention and lower browning. High methoxyl pectin (HMP) was first
investigated. AA stability and browning were studied during film storage at 33.3, 57.7, or 75.2%
relative humidity (RH) and 25 C; their dependence on water mobility determined through 1H NMR
analysis as well as the correlation between browning and AA degradation were again found.
Network characteristics and glycerol (plasticizer) interactions were analyzed through X-ray diffraction
and Fourier transform infrared spectroscopy as well as through uniaxial tensile assay. From all
results obtained, it was hypothesized that browning development in solidlike systems may be
directly related to the water molecules more closely adsorbed on the hydroxyl-polymeric (active)(HMP) was first
investigated. AA stability and browning were studied during film storage at 33.3, 57.7, or 75.2%
relative humidity (RH) and 25 C; their dependence on water mobility determined through 1H NMR
analysis as well as the correlation between browning and AA degradation were again found.
Network characteristics and glycerol (plasticizer) interactions were analyzed through X-ray diffraction
and Fourier transform infrared spectroscopy as well as through uniaxial tensile assay. From all
results obtained, it was hypothesized that browning development in solidlike systems may be
directly related to the water molecules more closely adsorbed on the hydroxyl-polymeric (active)(RH) and 25 C; their dependence on water mobility determined through 1H NMR
analysis as well as the correlation between browning and AA degradation were again found.
Network characteristics and glycerol (plasticizer) interactions were analyzed through X-ray diffraction
and Fourier transform infrared spectroscopy as well as through uniaxial tensile assay. From all
results obtained, it was hypothesized that browning development in solidlike systems may be
directly related to the water molecules more closely adsorbed on the hydroxyl-polymeric (active)(plasticizer) interactions were analyzed through X-ray diffraction
and Fourier transform infrared spectroscopy as well as through uniaxial tensile assay. From all
results obtained, it was hypothesized that browning development in solidlike systems may be
directly related to the water molecules more closely adsorbed on the hydroxyl-polymeric (active)-polymeric (active)
surfaces. The HMP film microstructure produced the best immobilization of water molecules except
at 75.2% RH, where it showed lower AA stability than acylated-deacylated gellan film. It is
suggested that disordered regions of this pectin network may not be adequately counterbalanced
by more transient junction zones of alternating hydrophilic (water) and hydrophobic (methyl ester)-deacylated gellan film. It is
suggested that disordered regions of this pectin network may not be adequately counterbalanced
by more transient junction zones of alternating hydrophilic (water) and hydrophobic (methyl ester)(water) and hydrophobic (methyl ester)
interactions, also disturbed by glycerol molecules, for accomplishing enough water immobilization in
the whole network at 75.2% RH.