Journal
JOURNAL OF APPLIED POLYMER SCIENCE
Volume 119, Issue 6, Pages 3553-3559Publisher
WILEY-BLACKWELL
DOI: 10.1002/app.33022
Keywords
antioxidants; green tea; high performance liquid chromatography (HPLC); poly(propylene); (PP); stabilization
Categories
Funding
- Xunta de Galicia Govern [PGIDIT05TAL17201PR]
- Research University Groups, Xunta de Galicia Govern
- FEDER
Ask authors/readers for more resources
Several natural matrices were investigated as potential sources of antioxidants to be used as plastic additives. Extracts of four matrices obtained under the same experimental conditions were initially considered: green tea, black tea, Lippia citriodora and Hypericum androsaemum. Both, the antioxidant activity of the extracts and their content in flavanols and quercetin, were compared. The antioxidant activity was determined by DPPH analysis and the phenolic composition by high performance liquid chromatography (HPLC) using ultraviolet (UV) diode array and fluorescence (FL) detectors. Concentration of the flavanols reduced in the same way as their antioxidant activity starting with green tea, through black tea, Hypericum androsaemum, and Lippia citriodora. The performance of polypropylene samples stabilized with green tea extract, or its individual components catechin and epicatechin, was compared with samples stabilized with a mixture of the synthetic antioxidants Irganox 1076 and Irgafos 168. Each sample was extruded and consecutively reextruded up to four times. The melt flow index (MFI) and the oxidation induction time (OIT) of the samples were measured after each step. The obtained results showed the interest of this natural matrix as a potential source of antioxidants for plastics. (C) 2010 Wiley Periodicals, Inc. J Appl Polym Sci 119: 3553-3559, 2011
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available