High methoxyl pectin–methyl cellulose films with antioxidant activity at a functional food interface
- Perez, C. D.
- De'nobili, Maria Dolores
- Rizzo, Sergio Anibal
- Gerschenson, Lia Noemi
- Descalzo, Adriana Maria
- Rojas, Ana Maria Luisa
DOIAbstract
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 prop...
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