Na Yao¹, Haiyang Ding^1,2,*, Mei Li¹, Shouhai Li^1,2, Lina Xu¹, Xiaohua Yang¹

Journal of Renewable Materials, Vol.11, No.7, pp. 3115-3128, 2023, DOI:10.32604/jrm.2023.026823 - 05 June 2023

Abstract It is of considerable significance to develop efficient and environmentally friendly machinery lubricant additives because of the increasing depletion of petrochemical resources and severe environmental problems. Herein, we proposed a facile strategy to synthesize a multifunctional vegetable oil-based lubricant via the lignin derivative vanillin coupled to amine and diethyl phosphite to produce a lubricating additive with both extreme pressure and antioxidant properties. Compared with pure tung oil, the lubricating and antioxidant performance of tung oil is significantly improved after adding additives. Adding the 1.0 wt% additive to the tung oil reduced the friction wear coefficient More > Graphic Abstract

XIAOXU ZHANG^1,2, LIN ZHANG¹, LIN DU³, HUIYAN SUN⁴, XIA ZHAO², YANG SUN¹, WEI WANG^2,*, LISHENG WANG^1,3,*

BIOCELL, Vol.47, No.2, pp. 385-392, 2023, DOI:10.32604/biocell.2023.025203 - 18 November 2022

Abstract Mesenchymal stem cells (MSCs) have been widely used in regenerative medicine and clinical therapy due to their capabilities of proliferation, differentiation, and immune regulation. However, during in vitro expansion, MSCs are prone to aging, which largely limits their application. Prostaglandin E-2 (PGE-2) is a key effector secreted by MSCs to exert immunomodulatory effects. By screening the compound library for PGE-2 secretion, the antioxidant trolox was verified as a stimulator of MSCs to secrete PGE-2. The effect of antioxidant trolox on biological characteristics of MSCS, including aging, proliferation, and gene expression, was examined. The results demonstrated that More >