Dry- and wet-ashing techniques compared in analyses for zinc, copper, manganese, and iron in hair.

Friel, JK; Ngyuen, C D

doi:10.1093/clinchem/32.5.739

Cited by 18 publications

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“…The dry ashing method is a traditional sample pretreatment method which can give lower blank levels and lower background current and has the ability to handle considerably larger amounts of samples. , The analytical results of this procedure are evaluated first. According to Figure (conditions A−C) after ashing at different temperatures from 350 to 750 °C and extraction by 2% diluted nitric acid, we can see that only small amounts of metals can be determined as compared with those by NAA.…”

Section: Resultsmentioning

confidence: 99%

“…Subsequently, we adopted the second kind of pretreatment method, i.e., the wet digestion method, which consumed larger amounts of acid reagents and thus gave higher blank contributions for some elements. , Digestion without high pressure was first investigated: the weighted samples were directly digested for 8 h at 120 °C over a hot plate. However, after digestion, the obtained digested solutions consisted of a quantity of black particles.…”

Section: Resultsmentioning

confidence: 99%

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Quantitative Analysis of Metal Impurities in Carbon Nanotubes: Efficacy of Different Pretreatment Protocols for ICPMS Spectroscopy

et al. 2008

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Metal impurities in carbon nanotubes (CNTs) are undesirable for their uses in diverse applications, for instance, they may potentially have a negative health impact when using in biomedical fields. However, so far there is a lack of analysis methods able to quantify metallic impurities in CNTs. In this paper, using the neutron activation analysis (NAA) technique as a nondestructive standard quantification method and inductively coupled plasma mass spectrometry (ICPMS) as a practical approach, we established an analytical method for quantitative determination of metallic impurities in CNTs. ICPMS, one of the most sensitive analytical techniques used for coincident multielement measurements, has become a common tool in many laboratory, and thus it is easily available and a good selection for determining the metal impurities in CNTs. However, because of their extremely stable structure and the encapsulated metals in the defect structure, CNTs must undergo special pretreatments before ICPMS. We investigated different sample pretreatment procedures for ICPMS analysis, including dry ashing coupled with acid extraction, wet digestion, and a combination of dry ashing with acid digestion. With the reference data from the nondestructive analytical method of NAA, we found that the quantitative determination of metal impurities in CNTs is highly dependent on the sample pretreatment in which the conditions are largely different from those used for conventional biological samples or environmental materials. This paper not only provides the practical method and analysis conditions for quantifying the metal impurities of CNTs but also the first protocol for pretreatment processes of CNT samples.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Quantitative Analysis of Metal Impurities in Carbon Nanotubes: Efficacy of Different Pretreatment Protocols for ICPMS Spectroscopy

et al. 2008

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“…Phosphate analysis was carried out using the UV-vis spectrophotometer method. Phosphate analysis was carried out using the UV-vis spectrophotometer method by modifying the Friel procedure with wet ashing using HNO 3 and HClO 4 (Friel and Ngyuen, 1986) and the solution was analyzed using a spectrophotometer with a wavelength of 400-470 nm (Kibria et al, 2019). Potassium analysis was carried out using the Atomic Absorption Spectrophotometry method.…”

Section: Methodsmentioning

confidence: 99%

Role of Organic Fertilizer Types on Nutrient Absorption and Soybean Yield in Teak-based Agroforestry Systems

Setyaningrum,

Budiastuti,

Purnomo

et al. 2023

ASD

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Background: Indonesia’s soybean production is insufficient to meet the demand for domestic soybean consumption as 86.4% demand is met from imports. Climatic conditions strongly influence soybean production and its quality in Indonesia, so the agroforestry system are used to to boost soybean production. However, the weakness of the agroforestry system is the low light intensity resulting in lower production. This study examines the effect of various organic fertilizers on nutrient uptake and soybean yields in teak-based agroforestry systems. Methods: The study used a complete randomized block design with one factor, namely the type of fertilizer with seven levels, namely inorganic fertilizer (Urea 50 kg/ha, SP36 100 kg/ha and KCl 100 kg/ha), Indigofera tinctoria compost, corncob compost, peanut green manure, chicken manure, goat manure and cow manure (dose of 5 tons/ha) and repeated three times. Result: The type of fertilizer affects nitrogen and potassium uptake, root length and biomass, number of leaves, plant biomass and 1 ha soybean yield in a teak-based agroforestry system. Indigofera tinctoria compost produced the highest nitrogen and potassium uptake, 13.83g and 2.77g. Nitrogen uptake is positively correlated with root length and plant biomass. The highest soybean yield in the peanut green manure treatment was 1.6 tons. Organic fertilizers increased nutrient uptake and soybean yields under teak stands compared to inorganic fertilizers.

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“…The ability of phytase to increase bioavailability of PA bound minerals (Ca 2+ , Fe 2+ , and Zn 2+ ) from CPF was quantified using an inductively coupled plasma atomic emission spectroscopy (ICP‐AES). Digestion of CPF for total mineral analysis was carried out according to Friel and Ngyuen (), with slight modification. CPF was dried in oven at 80C until constant weight was obtained.…”

Section: Methodsmentioning

confidence: 99%

Selection of Phytase Producing Yeast Strains for Improved Mineral Mobilization and Dephytinization of Chickpea Flour

Pable

Gujar

Khire

2013

Journal of Food Biochemistry

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Among 600 yeast isolates screened for phytase production, five (Zygosaccharomyces bisporus NCIM 3265 and 3296, Williopsis saturnus NCIM 3298, Zygosaccharomyces priorionus NCIM 3299 and Schizosaccharomyces octosporus NCIM 3297) were selected as potential phytase producers. Phytase activity was found to be cell wall associated with temperature and pH optima of 50C and 4.0, respectively. Highest phytase production was attained in cane juice medium as compared with other media used. Addition of phytase to chickpea flour significantly enhanced mineral mobilization by approximately 20-28%, 26-37% and 24-42% for Zn 2+ , Fe 2+ and Ca 2+ , respectively, and decreased phytic acid content by about 75-88%. PRACTICAL APPLICATIONSChick pea is one of the most popular vegetarian foods in most developing countries. It is a rich source of protein and minerals like Ca 2+ , Mn 2+ , Fe 2+ , Cu 2+ and Mg 2+ ; but these metal ions are bound to phytic acid, which acts as an antinutrient. Treatment of chickpea flour with yeast phytase hydrolyzed the phytic acid and released the bound metal ions. The ability of yeast phytase to improve mineral mobilization and dephytinization of chickpea flour suggests its potential application in food processing and feed industry.

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Dry- and wet-ashing techniques compared in analyses for zinc, copper, manganese, and iron in hair.

Cited by 18 publications

References 0 publications

Quantitative Analysis of Metal Impurities in Carbon Nanotubes: Efficacy of Different Pretreatment Protocols for ICPMS Spectroscopy

Quantitative Analysis of Metal Impurities in Carbon Nanotubes: Efficacy of Different Pretreatment Protocols for ICPMS Spectroscopy

Role of Organic Fertilizer Types on Nutrient Absorption and Soybean Yield in Teak-based Agroforestry Systems

Selection of Phytase Producing Yeast Strains for Improved Mineral Mobilization and Dephytinization of Chickpea Flour

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