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The outlook on increasing costs for mineral oil makes regenerative energy sources more interesting. Biodiesel consists of Fatty Acid Methyl Esters (FAME) produced by transesterification of natural oils e.g. rape oil. The quality control of biodiesel (DIN EN 14214) implements the measurement of residual methanol, free glycerol and glycerol esters(mono-, di- and tri-glycerides). Methods and maximum concentrations of the components are given in the standards DIN EN 14110 and DINEN 14105. More details also including the sample preparation can be found in this Application Book,