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High methoxyl pectin–methyl cellulose films with antioxidant activity at a functional food interface

The effect of using increasing proportions of methylcellulose (MC) for the development of glycerol plasticized films based on high methoxyl pectin (HMP) (30:70, 50:50 and 70:30 w/w HMP:MC) and carrying l-(+)-ascorbic acid (AA) was studied with the purpose of achieving higher stability of AA and loca...

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Main Authors: Perez, Carolina Daiana, De'Nobili, Maria Dolores, Rizzo, Sergio Anibal, Gerschenson, Lia Noemi, Descalzo, Adriana Maria, Rojas, Ana Maria Luisa
Format: Artículo
Language:Inglés
Published: 2018
Subjects:
Nuez
Aceites
Metilcelulosa
Pectinas
Acido Ascórbico
Walnuts
Oils
Methyl Cellulose
Pectins
Ascorbic Acid
Film
Online Access:https://www.sciencedirect.com/science/article/pii/S0260877412005560
http://hdl.handle.net/20.500.12123/2712
https://doi.org/10.1016/j.jfoodeng.2012.11.004
Summary:The effect of using increasing proportions of methylcellulose (MC) for the development of glycerol plasticized films based on high methoxyl pectin (HMP) (30:70, 50:50 and 70:30 w/w HMP:MC) and carrying l-(+)-ascorbic acid (AA) was studied with the purpose of achieving higher stability of AA and localized antioxidant activity at food interfaces. MC and 30:70 HMP:MC systems could not be casted. The shelf-life of the other AA-active films was assessed by storage at 25 °C, constant relative humidity (RH: 33.3%, 57.7% and 75.2%) and vacuum conditions. The rate constant for AA hydrolysis increased with the RH and, hence, with water mobility. Browning and AA degradation rates were directly related. When stored at 75.2% RH, both decreased as MC proportion increased. Compared to HMP film, the highest proportion of MC (50:50 HMP:MC) showed the highest AA stabilization under vacuum and greater performance under air atmosphere. They also developed localized antioxidant activity preserving the tocopherol content of walnut oil.

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