Strategies for supercritical fluid extraction of polar and ionic compounds
نویسندگان
چکیده
The methods used to facilitate the supercritical fluid extraction (SFE) of polar and ionic compounds are based on two general principles, either increasing the polarity of the supercritical fluid (SF) (usually CO,) used as extractant or reducing the polarity of the analytes to be leached from the solid matrices. Changes in the pressure and temperature of the SF, the use of SFs more polar than CO, or of modified CO?, ion pair formation, esterification, the use of and organometallics, or complex formation are the most common ways of increasing the extraction efficiency for polar and ionic analytes.
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