Assessment of Caffeine Content in Tea and Coffee Brands Within the Palestinian Market Using HPLC Method

Waad Hisham, Haneen Nur, Hanadi Sinokort, Duha Haslamon, Alaa Khraiwesh, Abdel Qawasmeh
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Abstract

Tea and Arabic coffee drinks are part of the daily routine for the Palestinian population due to deep cultural roots and their caffeine contents. The quality of the tea and coffee may be affected by the controlled-long quarantine procedure followed during importation. Caffeine quantity in tea and coffee samples imported into Palestine has never been assessed. A documented HPLC method was used to determine caffeine contents in Palestinian commercially available imported brands of tea and coffee. The average caffeine content (%w/w) of tea and coffee samples was in the ranges of 0.94%–1.5% and 0.45%–0.74%, respectively. The limit of quantitation (LOQ) and the limit of detection (LOD) were found to be 1.3 and 0.5 ppm, respectively. The relative standard deviation (RSD) for repeatability was less than 5%, which is acceptable, whereas the recovery was more than 97%. The quantity of caffeine in commercially tea and coffee samples test were within the range documented in literature. This suggests that the tea and coffee quality in terms of their caffeine content has not been affected by the procedural/political issues surrounding occupied Palestinian territories. Whether other factors such as phenolic compounds and their attributed antioxidant capacity are affected is a subject of future studies.

Abstract Image

用高效液相色谱法评估巴勒斯坦市场上茶和咖啡品牌的咖啡因含量
茶和阿拉伯咖啡饮料是巴勒斯坦人日常生活的一部分,因为他们有着深厚的文化根源和咖啡因含量。茶叶和咖啡的质量可能会受到进口过程中所遵循的长时间检疫程序的影响。进口到巴勒斯坦的茶和咖啡样品中的咖啡因含量从未进行过评估。采用高效液相色谱法测定巴勒斯坦市售进口品牌茶和咖啡中的咖啡因含量。茶和咖啡样品的平均咖啡因含量(%w/w)分别在0.94% ~ 1.5%和0.45% ~ 0.74%之间。定量限和检出限分别为1.3 ppm和0.5 ppm。重复性的相对标准偏差(RSD)小于5%,可接受,而回收率大于97%。商业茶和咖啡样品的咖啡因含量均在文献记载的范围内。这表明,就咖啡因含量而言,茶和咖啡的质量没有受到围绕被占领巴勒斯坦领土的程序/政治问题的影响。是否其他因素,如酚类化合物及其固有的抗氧化能力受到影响是未来研究的主题。
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