Departmento de Odontología Y Comunitaria, Facultad de Odontología, Universidad de Buenos Aires, 2142 Marcelo Torcuato de Alvear, C1122, Buenos Aires, Argentina.
Natural Products Laboratory, School of Pharmacy, Federal University of Ceara, Fortaleza, Brazil.
Environ Monit Assess. 2022 Aug 17;194(10):682. doi: 10.1007/s10661-022-10345-9.
To evaluate the fluoride concentration and pH of tea derived from Camellia sinensis produced and commercialized in Argentina. Forty-eight varieties of tea (black (n = 16), green (n = 21), red (n = 7), and white (n = 4)) commercialized in the form of leaves or tea bags were acquired. One bag or 2.0 ± 0.05 g of each product was infused for 5 min in 200 mL of distilled boiled water. The F concentration was determined using an ion-selective electrode and pH was measured using a pH meter. The found fluoride concentrations ranged from 0.1 to 9.7 µg/mL and the pH ranged from 2.7 to 5.1. A higher fluoride concentration was observed in the leaves group (2.75 ± 2.65 µg/mL) compared to tea bags (1.10 ± 0.82 µg/mL) (p < 0.05). Regarding the type of tea, green and black tea were richer in F than red and white tea. Fluoride and pH appeared not to be correlated (Pearson test). All the studied tea samples presented fluoride concentrations greater than the threshold recommended for drinking water. The pH proved to be low, which could be a risk for erosive tooth wear.
评估产自阿根廷的商品化茶（茶树）的氟浓度和 pH 值。采集了 48 种茶（黑茶（n=16）、绿茶（n=21）、红茶（n=7）和白茶（n=4）），有叶茶和袋泡茶两种形式。每袋或 2.0±0.05 g 的每种产品在 200 mL 煮沸的蒸馏水中浸泡 5 分钟。采用离子选择性电极法测定氟浓度，pH 值用 pH 计测定。测得的氟浓度范围为 0.1 至 9.7 µg/mL，pH 值范围为 2.7 至 5.1。与袋泡茶（1.10±0.82 µg/mL）相比，叶茶组的氟浓度更高（2.75±2.65 µg/mL）（p<0.05）。关于茶的类型，绿茶和红茶比红、白茶含有更多的氟。氟和 pH 值似乎没有相关性（皮尔逊检验）。所有研究的茶样品的氟浓度均高于饮用水推荐阈值。pH 值较低，可能会对牙齿侵蚀造成风险。
