BLOOMINGTON, Ind.--(BUSINESS WIRE)--A new purification process developed by Cook Medical for culture oil used in assisted reproduction eliminates traces of contaminants below detectable limits of 0.1 parts per million. The oil is purified by a proprietary refining technique that removes hydrocarbon impurities, which can have adverse effects on fertilization and threaten the viability of the developing embryos. The culture oil viscosity, MEA and LAL parameters remain unchanged.