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Starbucks Refreshers, Red Bull Sugarfree, Coca Cola Clas-sic) were all purchased from supermarkets. Deuterated caffeine [Caffeine-(trimethyl-d9), 99 at.% D, 98% (CP)] (Product-725625, Sigma-Aldrich, Milwaukee, WI) was used as the internal standard for quantitativeanalysisofcaffeine.Themethodssectionisdivided into two parts: 1) the prelab and 2 ... ................
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