This definition appears very rarely
The precise temperature conditions will be dependent on the details of the equipment used. Reagents:N,N - bis(trimethylsilyl)fluoroacetamide (BSTFA)Trimethylchlorosilane (TMCS)Pyridine, analytical grade, kept over KOHn-Heptadecane, analytical grade, 99% minimum Reference materials: Propylene glycol, propylene glycol monostearate. Internal standard solution: Accurately weigh approximately 100 mg internal standard, n-heptadecane into a 100-ml volumetric flask, dilute with pyridine to the mark. Reference solution: Accurately weigh approximately 100 mg propylene glycol monostearate into a 25-ml volumetric flask adding internal standard solution to the mark. When pure reference material of other components such as propylene glycol and di-fatty acid esters of propylene glycol.