Sephadex LH-20 (Pharmacia Fine Chemical Co. Ltd) was used for column chromatography. Precoated silica gel plates (Merck, Kieselgel 60 F254, 0.25 mm) and precoated RP-18 F254s plates (Merck) were used for thin-layer chromatography (TLC) analysis. High resolution FAB-MS and ESI-MS were recorded on JEOL JMS700N and JMS-100TD, respectively. 1H- and 13C-NMR, 1H-1H COSY, NOESY, HSQC, and HMBC spectra were recorded with a Unity plus 500 spectrometer (Varian Inc., U.S.A.) operating at 500 MHz for 1H and 125 MHz for 13C, respectively. 1H-NMR chemicals shifts are expressed in δ values referring to the solvent peak δH 2.49 for DMSO and coupling constants are expressed in Hz. 13C-NMR chemical shifts are expressed in δ values referring to the solvent peak δC 39.5 for DMSO. Piperonylic acid was purchased from commercial sources (TCI) and used without further purification.
Jms700n
Manufactured by JEOL
Sourced in Japan
The JMS700N is a high-performance mass spectrometer designed for advanced analytical applications. It features a compact and versatile design, providing accurate and reliable measurements across a wide range of sample types. The core function of the JMS700N is to perform high-resolution mass analysis and detection, enabling users to identify and quantify a variety of chemical compounds with precision.
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3 protocols using jms700n
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Structural Analysis of Natural Compounds
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Analyzing Crystals from VCM-Lasixin Mixture
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The crystals obtained at 24 h after mixing from the mixture of VCM (at pH 2.5) and Lasixin- jections were ˆltered and dissolved by N,N-dimethylformamide. Then, they were analyzed using a mass spectrometer (JMS-700N; JEOL, Tokyo).
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Characterization of Organic Compounds
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General All chemicals were purchased from TCI (Tokyo, Japan) and used without further purification. Precoated silica gel plates (Merck, Kieselgel 60 F 254 , 0.25 mm) and precoated RP-18 F 254s plates (Merck, Germany) were used for TLC analysis. Sephadex LH-20 (Pharmacia Fine Chemical Co., Ltd., Tokyo, Japan) was used for column chromatography. Melting points were uncorrected. IR spectra (KBr) were recorded on a Nexus670NT Fourier transform (FT)-IR and are reported in frequency of absorption (cm -1 ). High resolution (HR)-FAB-MS and electrospray ionization (ESI)-MS were recorded on JEOL JMS700N and JMS-100TD spectrometers respectively. 1 H-and 13 (link) C-NMR spectra were recorded on a Unity plus 500 spectrometer (Varian Inc., U.S.A.) operating at 500 MHz and referenced to internal residual solvent. NMR data were pro-cessed using the acid citrate dextrose (ACD)/NMR Processor Academic Edition software (Advanced Chemistry Development, Inc., Canada).
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