Potentiometric Determination of Fluoride Release from Three Types of Tea Leaves

Zhu, Jiaming; Tang, Ath; Matinlinna, JP; Tsoi, KH; Hagg, Euo

doi:10.1016/s1452-3981(23)13175-0

Cited by 10 publications

(1 citation statement)

References 12 publications

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“…Based on the measurements of infusions without additives, the teas can be ranked with increasing pH as follows: black granulated < black leaf < green < white < pu-erh. The pH values of these teas ranged from 5.01 to 5.65 and were consistent with the literature data [39][40][41]. As a result of adding juices and citric acid solutions to the infusions, a decrease in the pH value was observed.…”

Section: Acidity Of the Analyzed Juices And Tea Infusionssupporting

confidence: 90%

The Effect of the Addition of Selected Juices on the Content of Aluminum in Tea Infusions and Health Risk Assessment in the Polish Population

Mazurek,

Włodarczyk-Stasiak

2024

Applied Sciences

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Tea is a plant rich in compounds that positively impact human health. Still, it also contains large amounts of aluminum, which is toxic to humans and passes into the infusion during brewing. The presented research aims to determine the effect of adding lemon, Japanese quince, and quince juice to infusions of various types of teas on their aluminum content. It should be emphasized that research on the impact of Japanese quince and quince juices has not yet been published. Exposure to exceeding the safe level of aluminum consumption from tea infusions was also assessed. It has been shown that adding juices that lower the pH of infusions increases the aluminum content by up to 150%. The main factor influencing the increase in the aluminum content in tea infusions with additives is the lowering of the pH value, and other ingredients present in the juices do not have a significant impact. The health risk assessment indicates the possibility of adverse health effects from aluminum consumption, especially from black and green tea infusions with the addition of Japanese quince and lemon juices. It has been shown that quince juice can be recommended as an addition to tea infusions because it causes the smallest increase in aluminum content in the infusion among the juices tested.

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Section: Acidity Of the Analyzed Juices And Tea Infusionssupporting

confidence: 90%

The Effect of the Addition of Selected Juices on the Content of Aluminum in Tea Infusions and Health Risk Assessment in the Polish Population

Mazurek,

Włodarczyk-Stasiak

2024

Applied Sciences

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Fluoride levels in river water from the volcanic regions of Cauca (Colombia)

Revelo-Mejía

Gutiérrez-Idrobo

López-Fernández

et al. 2022

Environ Monit Assess

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Fluoride concentrations of 0.5 mg/L in drinking water are considered useful for dental caries prevention. However, fluoride concentrations higher than 1.2 mg/L in water can pose a risk of dental fluorosis due to high exposure to fluoride. The objective is to determine the fluoride concentration in water from aqueducts of different Colombian municipalities of Cauca (Popayán, Coconuco, and Puracé) to assess the fluoride dietary intake from the consumption of this water. A total of 66 water samples have been taken from Popayán, Coconuco, and Puracé. Fluoride content was determined by fluoride ion-selective electrode (ISE) potentiometry. The fluoride concentrations recorded in Coconuco and Puracé water were ≤ 0.002 mg/L. The mean fluoride content recorded in the Popayán water was 0.42 mg/L, with its highest concentration in Cauca River water (0.83 mg/L). Considering the admissible intake values, the water from Popayán confers remarkable fluoride intakes, especially in children with high percentages of contribution to the admissible daily intake (46.7% to 7- to 12-month children and 41.5% to 1- to 3-year children). The fluoride content in the water of Coconuco and Puracé does not reach an optimal value (< 0.5 mg/L) for the protective effect against dental caries, while the water of the main Cauca River basin does reach the optimal value. Likewise, the intake of fluoride from the consumption of the analyzed water does not confer any health risk. However, the implementation of monitoring systems for fluoride levels is recommended in order to safeguard the consumer’s health.

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