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Jms dx303

Manufactured by JEOL

The JMS-DX303 is a magnetic sector mass spectrometer designed for high-performance elemental analysis. It features a dual-focusing design, combining both electric and magnetic sectors, to provide high mass resolution and sensitivity. The instrument is capable of accurate isotope ratio measurements and trace element detection.

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2 protocols using jms dx303

1

Analytical Techniques for Natural Products

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Analytical TLC was performed on silica gel 60F254 and RP-18F254S (Merck). Column chromatography was carried out on silica gel 60 (70–230 mesh, Merck) and COSMOSIL 75C18-OPN (Nacalai Tesque, Inc.). NMR spectra were recorded on JEOL ECA-600 and AL-400. Chemical shifts for 1H and 13C NMR are given in parts per million (δ) relative to tetramethylsilane (δH 0.00) and residual solvent signals (δC 77.0) as internal standards. Mass spectra were measured on JEOL JMS-700, JMS-DX303, and JMS-T 100 GC. Optical rotations were measured on JASCO P-1030.
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2

General Synthetic Procedure and Characterization

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General Procedure Pertaining to Synthesis All reagents were commercially available with high purity grade. TLC was performed on precoated plates, TLC sheets silica 60 F254 (Merck, Darmstadt, Germany) or TLC sheets Chromatorex NH silica (Fuji Silysia Chemical, Kasugai, Japan). Chromatography was carried out on Silica Gel 60N (40-100 mesh) (Kanto Chemical, Tokyo, Japan) and NH silica gel Chromatorex (NH, 100-200 mesh) (Fuji Silysia Chemical). NMR spectra were recorded on a JEOL (Tokyo, Japan) JNM-AL300 (300 MHz) and Bruker (Billerica, MA, U.S.A.) Avance 600 (600 MHz). Chemical shifts were referenced to tetramethylsilane (TMS). Mass spectrum (FAB) and high-resolution mass spectra (HRMS) were recorded by a JEOL JMS-DX303. HRMS were recorded by using positive fast atom bombardment (FAB) with 3-nitrobenzyl alcohol (NBA) as the matrix. IR-red spectra were recorded on a JASCO (Tokyo, Japan) FT/IR-410. The samples were prepared as KBr discs or thin films between sodium chloride discs. Melting points were determined on a Yanaco (Kyoto, Japan) melting point apparatus and were uncorrected.
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