G. Blasi
1999
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Quality indicators
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Abstract
Publisher Summary This chapter discusses the principal physical and chemical characteristics of piperonyl butoxide (PBO) and gives descriptions of several analytical methods that are each applicable to differing use patterns. PBO is an aromatic-aliphatic polyether produced from the condensation of the sodium salt of 2-(2-butoxyethoxy) ethanol and the chloromethyl derivative of hydrogenated safrole. Safrole is the major component of sassafras essential oil, which is distilled from the wood of a few species of trees growing in different geographical areas. The various sources of sassafras oil result in different qualities and quantities of impurities, some of which can lead to the origination of by-products during the manufacturing process. To minimize this effect, the sassafras oil is normally distilled before hydrogenation. Industrial grade 2-(2-butoxyethoxy) ethanol may contain the lower molecular weight ethoxylated butanol, 2-butoxyethanol as a typical impurity. Under normal conditions, PBO can be stored for 2 years at room temperature without any significant degradation and, when the product is kept in a suitable internally lacquered drum, it can remain stable for a much longer period. Gas-liquid chromatography is probably the most frequently encountered method in PBO assays, and quantitative analyses are normally carried out using an internal standard (IS) method.