Description General description Isoprene is a reactive aliphatic hydrocarbon[4] that originates as a byproduct of cholesterol synthesis.[5] Application Isoprene may be used as an analytical reference standard for the quantification of the analyte in human breath samples using substrate-integrated hollow waveguide mid-infrared sensors[5] and thermal desorption gas chromatography with ultraviolet detection.[6] Refer to the product′s Certificate of Analysis for more information on a suitable instrument technique. Contact Technical Service for further support.