Micro elemental analyzer

Manufactured by Elementar

Sourced in Germany

The Micro elemental analyzer is a laboratory instrument designed for the rapid and accurate determination of carbon, hydrogen, nitrogen, and sulfur content in a wide range of organic and inorganic materials. It provides precise elemental analysis with a high degree of reproducibility.

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Lab products found in correlation

Rf 1501 pc spectrofluorometer, by Shimadzu (1 mentions)

Close spelling variants of this product

Vario MICRO cube elemental analyzer Vario EL/micro cube elemental analyzer CHNOS Elemental Analyzer vario MICRO Micro Cube elemental analyzer Vario Micro Elemental Analyzer Elemental analyzer

3 protocols using micro elemental analyzer

Collagen Extraction from Bone Samples

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Bones were mechanically cleaned by abrasion with a diamond-tip burr and subsequently ~250 mg of material was removed using a diamond-tip cutting wheel. These bone samples were demineralized in 0.5 M HCl at 4°C for a period of several weeks. After demineralization, the remaining insoluble collagen was solubilized in 10⁻³ M HCl at 75°C for 48 h. The solution containing the soluble collagen was then filtered using a 60–90 μm filter (Elkay, Hampshire, UK) to remove insoluble particulates and then filtered using 30 kDa molecular weight cut-off centrifuge tubes (Pall Corporation, Port Washington, NY). The >30 kDa fraction was then frozen and lyophilized. Elemental and isotopic compositions of the dried collagen were determined in duplicate at the University of British Columbia using an Elementar Isoprime continuous-flow isotope ratio mass spectrometer coupled to a Vario Micro elemental analyzer (Hanau, Germany). Details on calibration, analytical accuracy and precision are presented in S2 File).

Jaouen K., Szpak P, & Richards M.P. (2016). Zinc Isotope Ratios as Indicators of Diet and Trophic Level in Arctic Marine Mammals. PLoS ONE, 11(3), e0152299.

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Elemental Analysis for Chitosan Derivatives

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The elemental analysis was performed on an element analysis instrument (Vario Micro Elemental Analyzer, Elementar, Germany). The carbon-nitrogen ratios were used to evaluate the degree of substitution in chitosan derivatives and the degrees of substitution (DS) were calculated by the following equations:

D S_{1} = \frac{n_{1} \times M_{C} - M_{N} \times W_{C / N}}{n_{2} \times M_{C}}

D S_{2} = \frac{M_{N} \times W_{C / N} + n_{2} \times M_{C} \times D S_{1} - n_{1} \times M_{C}}{n_{3} \times M_{C}}

D S_{3} = \frac{n_{1} \times M_{C} + n_{3} \times M_{C} \times D S_{2} - n_{1}^{'} \times M_{N} \times W_{C / N} - n_{2} \times M_{C} \times D S_{1}}{n_{2}^{'} \times M_{N} \times W_{C / N} - n_{4} \times M_{C}}

D S_{4} = \frac{n_{1}^{'} \times M_{N} \times W_{C / N} + n_{2}^{'} \times M_{N} \times W_{C / N} \times D S_{3} + n_{2} \times M_{C} \times D S_{1} - n_{1} \times M_{C} - n_{3} \times M_{C} \times D S_{2} - n_{4} \times M_{C} \times D S_{3}}{n_{5} \times M_{C}}

where DS₁, DS₂, DS₃, and DS₄ represent the deacetylation degree of chitosan, the DS of derivative 1, the DS of derivatives 2a-2c, and the DS of derivatives 3a-3c; M_C and M_N are the molar mass of carbon and nitrogen, M_C = 12, M_N = 14; n₁, n₂, n₃, n₄, and n₅ are the number of carbon of chitin, chitosan, derivative 1, derivatives 2a-2c, and derivatives 3a-3c, n₁ = 8, n₂ = 2, n₃ = 2, n₄ = 4, n₅ = 1; n^′₁ and n^′₂ are the number of nitrogen of chitosan and derivatives 2a-2c, n^′₁ = 1, n^′₂ = 2; W_C/N represents the mass ratio between carbon and nitrogen in chitosan derivatives.

Zhang J., Tan W., Wei L., Dong F., Li Q, & Guo Z. (2019). Synthesis, Characterization, and Antioxidant Evaluation of Novel Pyridylurea-Functionalized Chitosan Derivatives. Polymers, 11(6), 951.

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Rhodium(III) Complex Kinetics and Analysis

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NMR spectra were recorded on a 200 MHz Varian Gemini-2000 device. Chemicals shifts (δ) are reported in ppm and referenced to tetramethylsilane. Coupling constants ( J) are reported in hertz (Hz) and splitting patterns are indicated as s (singlet) and d (doublet). Elemental analyses (C, H, N) were performed by combustion and gas chromatographic analysis with an Elementar Vario MICRO elemental analyzer. pH measurements were carried out using a Mettler Delta 350 digital pH meter with a resolution ±0.01 mV, with a combination glass electrode. This electrode was calibrated using standard buffer solutions of pH 4, 7, and 9 obtained from Sigma. Kinetic measurements of the rhodium(III) complex 1 were carried out on a Perkin-Elmer Lambda 25 or 35 double-beam spectrophotometer in thermostated 1.00 cm quartz Suprasil cells. The temperature was controlled to ±0.1 °C. Varian Cary 100 spectrophotometers equipped with a thermal control unit were also used in kinetic experiments. All kinetic measurements were performed under pseudo-first-order conditions, i.e., at least a 10-fold excess of the complex was used. Fluorescence measurements were performed on a RF-1501 PC spectrofluorometer (Shimadzu, Japan).

Milutinović M.M., Bogojeski J.V., Klisurić O., Scheurer A., Elmroth S.K, & Bugarčić Ž.D. (2016). Synthesis and structures of a pincer-type rhodium(iii) complex: reactivity toward biomolecules. Dalton transactions (Cambridge, England : 2003), 45(39).

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