Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 63, Issue 45, Pages 10022-10031Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.5b03686
Keywords
biorefinery; cellulose nanocomposites; ethanol; food antioxidant; grass lignins; hydrogel films; organosolv; radical scavenging soda; wheat straw
Funding
- INRA CEPIA Lignocellulose biorefinery Programme through the Qualigraffi AIC Project
- Netherlands Ministry of Economic Affairs as part of the Biomass research program of ECN
- Labex Saclay Plant Sciences-SPS [ANR-10-LABX-0040-SPS]
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The antioxidant properties of grass lignins recovered from an alkaline industrial process and from different ethanol organosolv pretreatment processes were compared using two types of tests: (i) classical radical 2,2'-dipheny1-1-picrylhydrazyl (DPPH center dot) scavenging tests in dioxane/water or ethanol and (ii) tests involving multiphasic systems (lipid dispersion in water or cellulose film suspended in ethanol). These multiphasic systems were representative of food and packaging matrices in view of high-value applications. All lignins, in solution or in the film, effectively scavenged radicals. Moreover, they were competitive with a food commercial rosemary extract to protect linoleic acid against oxidation. Whereas the DPPH test in dioxane was not discriminant, differences appeared between lignins when the test was performed in ethanol or with the multiphasic systems. Moreover, radical scavenging activity was preserved in the film even after its immersion in ethanol. Structural analysis of lignins revealed that low-molar-mass phenolics, namely p-hydroxycinnamic acids and lignin depolymerization products, governed lignin antioxidant properties in the multiphasic systems.
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