Simultaneous multi-channel hydride generation atomic fluorescence spectrometry determination of arsenic, bismuth, tellurium and selenium in tea leaves

Zhang, Ni; Fu, Na; Fang, Zitong; Feng, Yuhuai; Ke, Ling

doi:10.1016/j.foodchem.2010.07.033

Cited by 92 publications

(38 citation statements)

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“…The study showed that Se has a very narrow concentration range from sufficiency to deficiency and toxicity (Sun, Liu, & Wu, 2013). Se deficiency can lead to heart disease, hypothyroidism and a weakened immune system, but excess exposure to Se often results in gastrointestinal disturbances, hair and nail changes and neurologic manifestations (Colangelo et al, 2014;Zhang, Fu, Fang, Feng, & Ke, 2011). In addition, essentiality and toxicity of Se depend on its chemical forms (Chandrasekaran, Ranjit, Karunasagar, & Arunachalam, 2008).…”

Section: Introductionmentioning

confidence: 99%

Solidified floating organic drop microextraction for speciation of selenium and its distribution in selenium-rich tea leaves and tea infusion by electrothermal vapourisation inductively coupled plasma mass spectrometry

Chen

Zhu

2015

Food Chemistry

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Section: Introductionmentioning

confidence: 99%

Solidified floating organic drop microextraction for speciation of selenium and its distribution in selenium-rich tea leaves and tea infusion by electrothermal vapourisation inductively coupled plasma mass spectrometry

Chen

Zhu

2015

Food Chemistry

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“…The SERS signal intensity (P SERS ) can be estimated under the effects of both the chemical enhancement and electromagnetic enhancement 37,38 [4] where N is the number of adsorbed molecules that experience SERS; …”

Section: B3100mentioning

confidence: 99%

“…136,137 Typically, inorganic oxyanions can be directly detected using SERS with the characteristic vibrational bands in the oxyanions. For example, ClO 4 − is directly detected by the SERS characteristic vibration bands at 950 cm −1 (dehydrated) and 934 cm −1 (in aqueous solution) on the Ag nanofilm deposited on a Cu foil. 138 NO 3 − and NO 2 − have been directly detected at a LOD of 0.5 ppm by the unique SERS peaks at 1056 and 1326 cm −1 , respectively, using the commercial gold-coated silicon substrate.…”

Section: Sers Sensor Design and Applicationsmentioning

confidence: 99%

“…Currently pollutants are typically measured with various laboratorybased techniques, such as atomic absorption spectroscopy, atomic fluorescence spectrometry, X-ray fluorescence spectrum, inductively coupled plasma and ion-coupled plasma-mass spectroscopy, mass spectrometry, chromatography, capillary electrophoresis, analytical profile index (API), polymerase chain reaction (PCR), and enzymelinked immunosorbent assay (ELISA). [3][4][5][6][7] Although these techniques have high sensitivity and accuracy, they rely on expensive instruments and require professional to treat samples and operate instruments in centralized laboratories. Additionally, analysis generally takes several hours to days.…”

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confidence: 99%

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Review—Surface-Enhanced Raman Scattering Sensors for Food Safety and Environmental Monitoring

Tang

Zhu

Meng

et al. 2018

J. Electrochem. Soc.

167

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This article gives a review of surface-enhanced Raman scattering (SERS) sensors for food safety and environmental pollution monitoring. It introduces the basic concepts of SERS substrates, SERS enhancement factors and mechanisms, SERS probes/labels, molecular recognition elements as well as optofluidic SERS devices (SERS sensors integrated with microfluidics). This article places an emphasis on the design strategies of various SERS sensors by utilizing fingerprinting SERS spectra or by using SERS probes. It highlights the applications of SERS sensors in detection of heavy metals (such as Hg 2+ , Pb 2+ , Cd 2+ and As 3+ ), inorganic anions (nitrite, nitrate, perchlorate and fluoride), toxic small molecules (polycyclic aromatic hydrocarbon, polychlorinated biphenyls, herbicides, pesticides, antibiotics and food additives), as well as pathogens (bacteria and viruses Food safety and environment pollution are among great challenges in the human society. There are some common pollutants in the environment and food, such as heavy metals, nitrites, phosphates, pesticides, herbicides, antibiotics, hormone, pathogens and other additives. Some pollutants initially are released into the environment, and then accumulate in the food chain, and enter human bodies. Uptake of pollutants by human poses a threat to human health to different extents. 1,2Hence it is essential to monitor pollutants in the environment and food. Currently pollutants are typically measured with various laboratorybased techniques, such as atomic absorption spectroscopy, atomic fluorescence spectrometry, X-ray fluorescence spectrum, inductively coupled plasma and ion-coupled plasma-mass spectroscopy, mass spectrometry, chromatography, capillary electrophoresis, analytical profile index (API), polymerase chain reaction (PCR), and enzymelinked immunosorbent assay (ELISA).3-7 Although these techniques have high sensitivity and accuracy, they rely on expensive instruments and require professional to treat samples and operate instruments in centralized laboratories. Additionally, analysis generally takes several hours to days. For example, 0.024 ppb of Hg 2+ and 0.023 ppb of As 3+ in drinking water can be detected using atomic absorption spectroscopy with a two-step electrothermal atomizer and hydride generation atomic fluorescence spectrometry, respectively. 8,9 However, they need multiple sample preconcentration processing and expensive instruments. PCR can improve the number of the target while ELISA can produce amplified recognition signal, which could both improve the detection sensitivity to pathogens. For example, oligonucleotide microarray with combination of CdSe/ZnS quantum dots as fluorescent labels shown high specificity and sensitivity of 10 colony forming units (CFU)/mL. 10 However, the complicated procedures are very time-consuming, and the method is also vulnerable to contamination. These laboratory-based techniques cannot meet the critical need of rapid on-site measurement of pollutants. Therefore, it is essential to develop portable sensors f...

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“…al. 35 determinaram simultaneamente Se, As, Bi e Te em amostras de folhas de chás submetidas à digestão com HCl concentrado e 30% de H 2 O 2 , a 125 ºC por 5 horas. Após a digestão, foi empregado um GF na atomização do Se e demais metais, e a análise química foi realizada por Espectroscopia de Fluorescência Atômica (AFS, do inglês Atomic Fluorescence Spectroscopy).…”

Section: Métodos Espectrométricosunclassified

Compostos Orgânicos E Inorgânicos Contendo Selênio: Revisão De Métodos Analíticos E Perspectivas Para Análises Químicas

et al. 2017

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publicado na web em 13/11/2017 ORGANIC AND INORGANIC COMPOUNDS CONTAINING SELENIUM: ANALYTICAL METHODS REVIEW AND CHEMICAL ANALYSIS PERSPECTIVES. This article critically reviews the spectrometric, chromatographic and electroanalytical methods applied for the identification and quantification of organic and inorganic compounds containing Se and their applications in food, biological and natural water samples. The main characteristics, advantages and disadvantages of each analytical method are presented, and special attention is paid to sample preparation strategies prior to identification and quantification. Perspectives of research on new analytical procedures with improved speed, sensitivity, selectivity, accuracy, and mainly environmentally friendly, are also reported.Keywords: selenium; analytical determination; spectrometry; chromatography; electroanalysis; speciation. CONSIDERAÇÕES GERAISA magnífica máquina humana necessita de diversos nutrientes, os quais são o combustível para a manutenção do seu perfeito funcionamento. Dependendo das quantidades necessárias, estes nutrientes são classificados como macronutrientes (carboidratos, proteínas, lipídios e fibras) e micronutrientes (vitaminas e minerais). Estes compostos apresentam funções específicas e, consequentemente, diferentes concentrações ideais para o desempenho de suas funções metabólicas. A ingestão diária de nutrientes dependerá da composição química da dieta alimentar. 1Dentre os principais micronutrientes destacam-se ferro, zinco, cobre, selênio, cromo, iodo, molibdênio, manganês, silício, níquel, boro, vanádio, flúor, arsênio, alumínio, lítio e estanho, seja em suas formas orgânicas ou inorgânicas. Estes compostos desempenham suas respectivas atividades metabólicas quando presentes em concentrações abaixo de microgramas por grama (µg g -1 ). Entretanto, acima destas concentrações podem apresentar toxicidade ao organismo humano. 1 Selênio, apresentado com a sigla Se, é um micronutriente essencial para a dieta humana, em função das suas propriedades antioxidantes, auxiliando no retardamento do envelhecimento, no tratamento de doenças cardiovasculares e neoplasias, distrofia muscular, esclerose múltipla, osteoporose, reprodutividade, e desordem muscular.2,3 Alguns estudos indicam sua importância no metabolismo e funcionamento da tireóide e sua atuação no metabolismo dos ácidos graxos, juntamente com a vitamina E (α-tocoferol). 4,5 Assim, o Conselho Americano de Alimentação e Nutrição (Food and Nutrition Board, EUA), 6 recomenda a ingestão diária de 15 a 20 µg por dia, de 55 µg por dia e 70 µg por dia, para crianças, mulheres lactantes e outros adultos, respectivamente. Entretanto, o limite má-ximo de ingestão diário para uma pessoa adulta não deve ultrapassar 400 µg.A diferença entre a concentração essencial de Se, a deficiência ou a toxicidade é muito pequena. As concentrações ingeridas são fortemente dependentes do nível de concentração em alimentos e na quantidade de alimento ingerido.7 O consumo diário abaixo de 0,1 µg de Se por grama de aliment...

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Simultaneous multi-channel hydride generation atomic fluorescence spectrometry determination of arsenic, bismuth, tellurium and selenium in tea leaves

Cited by 92 publications

References 14 publications

Solidified floating organic drop microextraction for speciation of selenium and its distribution in selenium-rich tea leaves and tea infusion by electrothermal vapourisation inductively coupled plasma mass spectrometry

Solidified floating organic drop microextraction for speciation of selenium and its distribution in selenium-rich tea leaves and tea infusion by electrothermal vapourisation inductively coupled plasma mass spectrometry

Review—Surface-Enhanced Raman Scattering Sensors for Food Safety and Environmental Monitoring

Compostos Orgânicos E Inorgânicos Contendo Selênio: Revisão De Métodos Analíticos E Perspectivas Para Análises Químicas

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