GC provides a useful technique for estimating volatile degradation products. For example the pivalic acid release from the hydrolysis of dipivefrin in an eyedrop preparation (Fig. 11.19) used for treating glaucoma may be estimated by GC.6 Isovaleric acid, which is an isomer of pivalic acid, provides a suitable internal standard. Breakdown products of esters are more likely to occur in aqueous formulations such as eyedrops or injections.
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Everything you wanted to know about. How To Cure Tennis Elbow. Are you an athlete who suffers from tennis elbow? Contrary to popular opinion, most people who suffer from tennis elbow do not even play tennis. They get this condition, which is a torn tendon in the elbow, from the strain of using the same motions with the arm, repeatedly. If you have tennis elbow, you understand how the pain can disrupt your day.