DIN ISO 20481:2011 Coffee and coffee products - Determination of the caffeine content using high performance liquid chromatography (HPLC) - Reference method (ISO 20481:2008)
2011DIN ISO 20481:2011 Coffee and coffee products - Determination of the caffeine content using high performance liquid chromatography (HPLC) - Reference method (ISO 20481:2008)
2000DIN 10777-2:2000 Analysis of coffee and coffee products - Determination of coffeine content - Part 2: HPLC rapid method