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Abstract
Polyphenols are the effective antioxidant compounds and recognized as fuel antioxidant additives, especially to the biodiesel fuel using for diesel engines. They have been successfully extracted from Vietnamese green tea leaves using ethanol solvent that meets the green chemistry process. The product is analyzed for its chemical composition through UV-Vis photometry and FTIR infrared measurements. Antioxidant polyphenol additives for biodiesel derived from vegetable oils were investigated. The experiment results showed that polyphenol not only improved oxidation stability and lowered fuel freezing temperature but also increased anti-corrosion efficiency for the engine. Research can also establish green, environmentally friendly processes and products for transportation fuels.