Polarized X ray fluorescence spectrometer (EDPXRF) for the determination of essential and non essential elements in tea

Desideri, Donatella; Meli, Maria Assunta; Roselli, Carla; Feduzi, Laura

doi:10.1016/j.microc.2011.01.008

Cited by 41 publications

(26 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Taking into account this value, the majority of samples in the present study contained nickel within this limitation, except few samples from South Korea, China and Japan (Sencha and Agari). Desideri and co-workers [ 45 ] based on the results obtained for teas from different countries established the mean level of Ni at 5.6 mg/kg with the range 3.2–7.1 mg/kg (for green teas). They also concluded very close level of nickel in both black and green tea samples.…”

Section: Resultsmentioning

confidence: 99%

Green Tea Quality Evaluation Based on Its Catechins and Metals Composition in Combination with Chemometric Analysis

et al. 2018

View full text Add to dashboard Cite

Green tea infusions are one of the most popular beverages consumed across the world, especially is Asian countries. Green tea quality is primarily based on catechin content, however, the concentration of elements could also significantly influence its biological properties and thus quality and safety. The main purpose of the present study was the evaluation of catechin, antioxidant activity and metal content (K, Na, Ca, Mg, Fe, Mn, Cu, Zn, Cr, Pb, Cd and Ni) in different green tea types cultivated in Japan, Sri Lanka, South Korea, India, China and Japan. The chemical analysis of samples was performed using LC-ESI-Q-TOF-MS for organic constituents and atomic absorption spectrometry (flame and electrothermal) method for inorganic ones. The obtained results were subjected to chemometric elaboration. EGC (213 mg/100 mL of the tea infusion in South Korean Jeoncha) and EGCG (124 mg/100 mL in Japanese Sencha) were the dominant catechins in all green tea samples. Chinese and Indian green tea samples contained the highest concentration of toxic heavy metals, however these values were far below appropriate limitations for green teas. PCA revealed significant similarities between Japanese samples and Korean Jeoncha. In general the latter one was evaluated to have the best quality based on the investigated parameters.

show abstract

Section: Resultsmentioning

confidence: 99%

Green Tea Quality Evaluation Based on Its Catechins and Metals Composition in Combination with Chemometric Analysis

et al. 2018

View full text Add to dashboard Cite

show abstract

“…These elements exert immunomodulatory functions and thus influence susceptibility to the course and outcome of a variety of viral infections (Desideri et al, 2011). Chromium is an essential element that acts as a cofactor in insulin synthesis and in regulation of cholesterol and blood triglycerides; however, reduction of Cr(VI) to lower oxidation states results in carcinogenicity (Demirezen and Uric, 2006;Shi et al, 1999).…”

mentioning

confidence: 99%

Essential and Toxic Elements in Honeys From a Region of Central Italy

Meli

Desideri

Roselli

et al. 2015

Journal of Toxicology and Environmental Health, Part A

Self Cite

View full text Add to dashboard Cite

Levels of iron (Fe), manganese (Mn), chromium (Cr), copper (Cu), zinc (Zn), mercury (Hg), cadmium (Cd), and lead (Pb) in several types of honey produced in a region of Central Italy were determined by atomic absorption spectroscopy (AAS). The degree of humidity, sugar content, pH, free acidity, combined acidity (lactones), and total acidity were also measured. These elements were found to be present in honey in various proportions depending upon (1) the area foraged by bees, (2) flower type visited for collection of nectar, and (3) quality of water in the vicinity of the hive. Strong positive correlations occurred between Pb and Hg, Pb and Cd, Pb and Fe, Pb and Cr, Hg and Cd, and Hg and Fe. The honey products synthesized in Central Italy were of good quality, but not completely free of heavy metal contamination. Compared with established recommended daily intakes, heavy metals or trace element intoxication following honey consumption in Italy was found not to be a concern for human health.

show abstract

“…Among the three micronutrients reported in the present study, Fe was found to be the most abundant in all the tea leaf samples followed by Zn and Cu ( concluded that the variation of in Fe content among tea samples is mainly attributed to the differences in the degree of fermentation and the plant available Fe content in the soil on which the plants were cultivated [1]. Furthermore, Fe content in tea quality was found to vary with varied realm of production and manufacturing as reported in different studies [40].…”

Section: Iron (Fe) In Made Teamentioning

confidence: 51%

Comparative Assessment of Copper, Iron, and Zinc Contents in Selected Indian (Assam) and South African (Thohoyandou) Tea (Camellia sinensis L.) Samples and Their Infusion: A Quest for Health Risks to Consumer

Karak

Paul

Kutu

et al. 2016

Biol Trace Elem Res

View full text Add to dashboard Cite

The current study aims to assess the infusion pattern of three important micronutrients namely copper (Cu), iron (Fe) and zinc (Zn) contents from black tea samples produced in Assam (India) and Thohoyandou (South Africa). Average daily intakes and hazardous quotient were reported for these micronutrients. Total content for Cu, Fe and Zn varied from 2.25 to 48.82 mg kg-1, 14.75 to 148.18 mg kg-1 and 28.48 to 106.68 mg kg-1 respectively. The average contents of each of the three micronutrients were higher in tea leaves samples collected from South Africa than those from India while the contents s in tea infusions in Indian samples were higher than in South African tea samples. Results of this study revealed that the consumption of not more than 600 mL tea infusion produced from 24 g of made tea per day may be beneficial to human in terms of these micronutrients content. Application of nonparametric tests revealed that most of the data sets do not satisfy the normality assumptions. Hence,\ud \ud Powered by Editorial Manager® and ProduXion Manager® from Aries Systems Corporation\ud \ud the use of both parametric and nonparametric statistical analysis that subsequently revealed significant differences in elemental contents among Indian and South African tea

show abstract

Polarized X ray fluorescence spectrometer (EDPXRF) for the determination of essential and non essential elements in tea

Cited by 41 publications

References 15 publications

Green Tea Quality Evaluation Based on Its Catechins and Metals Composition in Combination with Chemometric Analysis

Green Tea Quality Evaluation Based on Its Catechins and Metals Composition in Combination with Chemometric Analysis

Essential and Toxic Elements in Honeys From a Region of Central Italy

Comparative Assessment of Copper, Iron, and Zinc Contents in Selected Indian (Assam) and South African (Thohoyandou) Tea (Camellia sinensis L.) Samples and Their Infusion: A Quest for Health Risks to Consumer

Contact Info

Product

Resources

About