Determination of Caffeine Content in Commercial Energy Beverages Available in Saudi Arabian Market by Gas Chromatography-Mass Spectrometric Analysis

Table 4

Concentration of caffeine in energy beverages collected from Saudi Arabian market, determined by the current GC-MS method.

Energy drink sample	Caffeine content as label claim (mg/100 mL)	Pack size (mL)	Caffeine content detected (mg/100 mL) ± SD	Percent of the label claim
D1	30	185	31.47 ± 0.69	104.9
D2	30	250	32.08 ± 0.97	106.9
D3	20	250	20.82 ± 1.21	104.1
D4	30	250	31.82 ± 0.82	106.1
D5	32	250	33.72 ± 0.82	105.4
D6	32	250	30.03 ± 0.83	93.8
D7	30	250	28.48 ± 1.67	94.9
D8	Not mentioned	250	29.75 ± 1.21	–
D9	32	250	29.16 ± 1.11^∗	91.1

SD: standard deviation (n = 3). The statistical difference between the detected mean caffeine contents and label claims of respective energy drink samples was analyzed by the T-test at 95% confidence level (^∗).