Cephalexin

Cephalexin epimers are separated with an ODS column using a mobile phase of 0.1 mol L_1 phosphate buffer (pH 3.5)-methanol (95 : 5). The epimers are detected at 254 nm. The two epimers are separated to the baseline with the l-epimer being eluted prior to the d-epimer.

Cephalexin epimers in serum and urine are analysed using a TSK-gel ODS-80 TM column after deproteinization with methanol. Mobile phase compositions are 10 mmol L_1 ammonium acetate-methanol (4:1) for determination of the d-epimer, and 10mmolL_1 phosphate buffer (pH 3.0)-methanol (9:1) containing 10mmolL_1 ammonium acetate and 10mmolL_1 pentanesulfonic acid for determination of the l-epimer. The epimers are detected at 260 nm.

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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