Assertion: lipid's polarity | /r/MadeOf | methyltert-butyl ether
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Source sentences:
text: After free cholesterol had been recovered by elution with methyltert-butyl ether-acetic acid (100:0.2, v/v), various fractions enriched in particular phospholipids were eluted with mobile phases of increasing polarity containing methyltert-butyl ether, methanol and an ammonium acetate buffer (pH 8.6) in various proportions.