ตำรายาของประเทศไทย
Thai Pharmacopoeia
สำนักยาและวัตถุเสพติด กรมวิทยาศาสตร์การแพทย์ กระทรวงสาธารณสุข
Bureau of Drug and Narcotic, Department of Medical Sciences, Ministry of Public Health5.5 ESTER VALUE
The ester value is the number of mg of potassium hydroxide required to saponify the esters present in 1 g of the substance. If the Saponification Value and the Acid Value have been determined, the difference between these two represents the Ester Value.
Determine the “Acid Value” (Appendix 5.4) of the substance and the “Saponification Value” (Appendix 5.7). Calculate the ester value from the equation:
Ester Value = Saponification Value − Acid Value.