Tea infusion is the most frequently consumed beverage worldwide next to water, with about 20 billion cups consumed daily. In Taiwan, daily consumption averages 2.5 cups of tea infusion per person. Many studies have concluded that tea has numerous beneficial effects on health. However, some undesirable trace elements, such as arsenic, chromium, cadmium, lead, etc., are a concern. This study has three aims: (1) to measure the concentrations of arsenic and heavy metal elements, such as chromium, cadmium, and lead, as well as the essential trace elements contained in dried tea leaves of the common brands in Taiwan; (2) to determine the percentage released and concentration of each of these elements after infusion of these tea leaves with boiling water; (3) to assess the carcinogenic risk from daily tea consumption, to provide reference values for the general public. This study showed the total content of arsenic and heavy metals in green tea, oolong tea, and black tea produced in Taiwan was 0.11, 5.61, and 10.11 ug/g, respectively, indicating that the level of arsenic and heavy metal contamination of tea leaves was lower in Taiwan than other regions of the world. The hazard index (HI) of daily tea drinking of green tea, oolong tea, and black tea was low and within the bounds of safety (<1). Tea is an indispensable part of everyday life for many people in Taiwan, studies should continue to ensure that public health is maintained.
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ATSDR (2005) Toxicological profile. U.S. Department of Health and Human Services, Agency for Toxic Substances and Disease Registry
Azin F, Raie RM, Mahmoudi MM (1998) Correlation between the levels of certain carcinogenic and anticarcinogenic trace elements and esophageal cancer in Northern Iran. Ecotox Environ Safe 39:179–184
Chen HW (2006) Gallium indium, and arsenic pollution of groundwater from a semiconductor manufacturing area of Taiwan. Bull Environ Contam Toxicol 77:289–296
Chen HW (2007) Exposure and health risk of gallium, indium, and arsenic from semiconductor manufacturing industry workers. Bull Environ Contam Toxicol 78:113–117
Cohen MD, Kargacin B, Klein CB, Costa M (1993) Mechanism of chromium carcinogenicity and toxicity. Crit Rev Toxicol 23:255–281
Department of Health, Taiwan (2004) Annual report of Taiwan public health. Taipei, Taiwan
Fujihara T, Nakagawa-Izumi A, Ozawa T, Numata O (2007) High-molecular-weight polyphenols from oolong tea and black tea: purification, some properties, and role in increasing mitochondrial membrane potential. Biosci Biotechnol Biochem 71:711–719
Gupta S, Saha B, Giri AK (2002) Comparative antimutagenic and anticlastogenic effects of green tea and black tea: a review. Mutat Res 512:37–65
Han WY, Shi YZ, Ma LF, Ruan JY (2005) Arsenic, cadmium, chromium, cobalt and copper in different types of Chinese tea. Bull Environ Contam Toxicol 75:272–277
Herrador MA, González AG (2001) Pattern recognition procedures for differentiation of green, black, and oolong teas according to their metal content from inductively coupled plasma atomic emission spectrometry. Talanta 53:1249–1257
Kabata-Pendias A, Pendias H (1984) Trace elements in soils and plants. CRC Press, Boca-Raton
Narin I, Colak H, Turkoglu O, Soylak M, Dogan M (2004) Heavy metals in black tea samples produced in Turkey. Bull Environ Contam Toxicol 72:844–849
Natesan S, Ranganathan V (1990) Contents of various elements in parts of the tea plant and in infusions of black tea from southern India. J Sci Food Agric 51:125–139
Nookabkaew S, Rangkadilok N, Satayavivad J (2006) Determination of trace elements in herbal tea products and their infusions consumed in Thailand. J Agric Food Chem 54:6939–6944
Onianwa PC, Adetola IG, Iwegbue CMA, Ojo MF, Tella OO (1999) Trace heavy metals composition of some Nigerian beverages and food drinks. Food Chem 66:275–279
Qin F, Chen W (2007) Lead and copper levels in tea samples marketed in Beijing, China. Bull Environ Contam Toxicol 78:118–121
Rükaguer M, Neugebauer RJ, Plecko T (2001) The relation between selenium, zinc and copper concentration and the trace element dependent antioxidative status. J Trace Elem Biol 15:73–78
Tsushida T, Takeo T (1977) Zinc, copper, lead and cadmium contents in green tea. J Sci Food Agric 28:255–258
US EPA (2004) Integrated risk information system (CASRN 7440–43–9, 7440-38-2, 1854040-29-2, 7439-92-1 for Cd, As, Cr, Pb). Office of Health and Environment Assessment, Environmental Criteria and Assessment Office, Cincinnati, OH
Vellema P, Rutten VPMG, Hoek A, Moll L, Wentink GH (1996) The effect of cobalt supplementation on the immune response in vitamin B12 deficient Texel lambs. Vet Immunol Immunopathol 55:151–161
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Shen, F., Chen, H. Element Composition of Tea Leaves and Tea Infusions and Its Impact on Health. Bull Environ Contam Toxicol 80, 300–304 (2008). https://doi.org/10.1007/s00128-008-9367-z
- Tea infusions
- Arsenic (As)
- Chromium (Cr)
- Health risk