Analysis of trace elements in human hair by PIXE

Baptista, G.B.; Montenegro, E. C.; Paschoa, Anselmo Salles; Leite, C. V. Barros

doi:10.1016/0029-554x(81)90617-0

Cited by 17 publications

(6 citation statements)

References 6 publications

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“…Baptista et al [20] dissolved a given mass of hair in nitric acid. The solution was then analyzed by the PIXE method for analysis of trace elements in human hair.…”

Section: Discussionmentioning

confidence: 99%

“…Several acidic or alkaline reagents have been proposed for dissolving hair samples, such as hydrochloric acid, sulfuric acid, nitric acid, perchloric acid, and NaOH solution [32]. Baptista and coworkers [20] dissolved 60 mg of human hair in 1 ml of pure nitric acid after careful preparation of the sample.…”

Section: Heterogeneity In the Energy Content Of The Crystalline Solidsmentioning

confidence: 99%

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Solubility of Structurally Complicated Materials: 3. Hair

Horvath

2009

The Scientific World JOURNAL

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Hair is composed of proteins, lipids, water, and small amounts of trace elements. All proteins in animal and human bodies are built from permutations of amino acid molecules in a polypeptide string. The polypeptide chains of protein keratin are organized into filaments in hair cells. Hair is one of the most difficult proteins to digest or solubilize. Among the most common dissolving procedures for hair are acidic, alkaline, and enzymatic hydrolysis. For the analysis of hair, the solid samples are transferred by solubilization via digestion into a liquid phase. Small molecular solvents and molecules with hydrophobic groups appear to have higher affinity for hair. A good solvent attacks the disulfide bonds between cystine molecules and hydrates the hair shaft. Consequently, the hair becomes a jelly-like mass.

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“…Baptista et al [20] dissolved a given mass of hair in nitric acid. The solution was then analyzed by the PIXE method for analysis of trace elements in human hair.…”

Section: Discussionmentioning

confidence: 99%

Section: Heterogeneity In the Energy Content Of The Crystalline Solidsmentioning

confidence: 99%

Solubility of Structurally Complicated Materials: 3. Hair

Horvath

2009

The Scientific World JOURNAL

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“…Sample Preparation. Direct irradiation of hair by a proton beam has been discussed by several authors (1)(2)(3)(4)(5)(6). This procedure has problems with electrostatic charging of the sample and determining absolute concentrations for trace elements.…”

Section: Methodsmentioning

confidence: 99%

“…However, at high laser energies optical saturation of the analyte begins to occur and at this point these theories are no longer applicable. Recently we have described some effects of optical saturation in thermal lensing spectrophotometry (TLS) (6). One of these effects was the observation of a PDS signal greater than that of a TLS signal.…”

mentioning

confidence: 99%

Sample preparation and system calibration for proton-induced x-ray emission analysis of hair from occupationally exposed workers

Clayton¹,

Wooller²

1985

Anal. Chem.

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“…As it is easy to collect hair samples from normal humans, measurements were made on 10 control samples. Baptista et al 20 performed trace elemental analysis of human hair samples by the PIXE technique employing two methods of target preparation. They concluded that the method of dissolving hair samples in nitric acid is more convenient than that in which hair strands were placed on an aluminum frame and used as the target.…”

Section: Sample Preparationmentioning

confidence: 99%

Effect of radiation therapy on trace elemental concentrations of hair samples of cervical cancer patients—PIXE technique

et al. 2004

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Trace elemental analysis of hair samples from subjects suffering with cervical cancer before radiation therapy and at successive intervals during radiation therapy was carried out using the PIXE technique. A 2 MeV proton beam was employed. The elements Cl, K, Ca, Ti, Cr, Mn, Fe, Ni, Cu, Zn and Pb were identified and their relative concentrations were estimated. The concentrations of Cl, K, Ca, Ti, Cr, Mn, Fe, Ni and Zn were found to be lower in hair samples of cervical cancer patients before radiation therapy than those from controls, whereas the concentration of Cu showed the opposite trend. The concentrations of Cl, K, Ca, Ti, Mn, Fe, Cu, Zn and Pb showed a definite trend of variation with successive intervals of radiation therapy, which indicates that these elements are affected during radiation therapy. The Cu/Zn ratio also decreases with successive radiation therapy.

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Analysis of trace elements in human hair by PIXE

Cited by 17 publications

References 6 publications

Solubility of Structurally Complicated Materials: 3. Hair

Solubility of Structurally Complicated Materials: 3. Hair

Sample preparation and system calibration for proton-induced x-ray emission analysis of hair from occupationally exposed workers

Effect of radiation therapy on trace elemental concentrations of hair samples of cervical cancer patients—PIXE technique

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