Free radical scavenging ability of sodium lignosulfonate and its application in food grade polypropylene

Abstract

<jats:title>Abstract</jats:title><jats:p>Sodium lignosulfonate (SL) was prepared from waste of cotton lignin (CL) through hydrothermal reaction method. Orthogonal experiment was designed with value of OIT as objective function. Polypropylene (PP) is a polymer produced by the addition polymerization of propylene. It is a white waxy material with a transparent and light appearance, which is widely used in food and pharmaceutical packaging. The results of GPC and TG analysis revealed that SL has stable thermal properties, which means that SL has the potential to be an antioxidant for PP materials. In addition, the scavenging effects of CL and SL were studied. The obtained results exhibited that the SL can obviously increase the scavenging effect on free radicals and it is a kind of new synthetic antioxidant with antioxidant property, which could effectively delay the oxidation of PP. Subsequent rheological experiments proved that the SL/PP sample can improve the heat-resistant oxygen performance of PP under the thermal oxygen shearing environment. Combined with the effect of SL on the mechanical properties of PP before aging, SL has a stabilizing effect on PP thermal oxygen aging.</jats:p>

Superoxide Radical Capture Agent for a Stable and Efficient Li-CO2 Battery: Experimental and Density Functional Theory Studies

“…55−57 Furthermore, LSS contains numerous hydrophilic groups (SO 3 − ) that contribute to its excellent dispersion in aqueous solutions. 58,59 The presence of phenolic groups in the backbone structure of LSS enables effective capture of O 2…”

“…Considering the antioxidant properties exhibited by specific polyphenolic compounds, biological matrix compounds rich in phenolic content emerge as promising candidates due to their efficient capture of free radicals through hydroxyl substituents and aromatic structures. Based on several previous studies, the radical-capturing ability of lignin and its derivatives has been demonstrated and evaluated owing to the presence of various functional groups (carboxyl, methoxy, carbonyl, and particularly nonetherified phenolic hydroxyl) within lignin. − Furthermore, LSS contains numerous hydrophilic groups (SO 3 – ) that contribute to its excellent dispersion in aqueous solutions. , The presence of phenolic groups in the backbone structure of LSS enables effective capture of O 2 •– and termination of free-radical chain reactions, thereby inhibiting the oxidation and decomposition of electrolytes …”

Synthesis and Application of Cardanol-Heterocyclic Amines as Photostabilizers and Antioxidants in Polylactic Acid

“…Thus, it is an inevitable trend to replace the traditional chemical raw material-synthesized antioxidants with low toxicity biobased antioxidants. Researchers reported the antioxidant properties of biophenols, including hydrogenated cardanol, lignin, , wine seeds, − α-tocopherol, , and others. − In fact, Lauberte et al found that the antioxidant property of lignin homopolymer components was poorer than commercial phenolic antioxidants due to the high carbonyl or carboxyl groups in the α or β positions of the propane chain in the molecular structure. To solve this problem, Lauberte et al performed a targeted modification of the lignin component, significantly reducing the conjugated carbonyl and phenolic structure unit.…”