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Gas-liquid chromatography of d-biotin.

A rapid and specific gas chromatographic method has been developed for the detection and determination of d-biotin. This technique has been found applicable to agricultural premixes and pharmaceutical injectable preparations. After suitable preliminary extraction, the biotin silyl ester is prepared using bis-(trimethylsilyl)acetamide (BSA) reagent. The silyl ester of d-biotin exhibited good peak symmetry and a linear response when utilizing a hydrogen flame ionization detector with a 2% OV-17 column operated at a temperature of 190°. The conditions for the assay of d-biotin in several preparations are described employing n-octa-cosane as the internal standard. The standard deviation of the developed procedure under the conditions studied was ±2.7%.