Agilent 400 mr nmr spectrometer

Manufactured by Agilent Technologies

Sourced in United States

The Agilent 400-MR NMR spectrometer is a nuclear magnetic resonance (NMR) spectrometer designed for laboratory use. It provides high-resolution NMR analysis capabilities.

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Lab products found in correlation

Kieselgel 60, by Merck Group (2 mentions) Dulbecco s modified eagle s medium dmem, by Thermo Fisher Scientific (1 mentions) 3 4 5 dimethylthiazol 2 yl 2 5 diphenyltetrazolium bromide mtt, by Merck Group (1 mentions) Fetal bovine serum (fbs), by Thermo Fisher Scientific (1 mentions) Scopolamine, by Merck Group (1 mentions) Agilent 1260 hplc system, by Agilent Technologies (1 mentions) Silica gel 60 f254 plate, by Merck Group (1 mentions) Combiflash rf lumen chromatography system, by Teledyne (1 mentions) Agilent 6490 ifunnel triple quadrupole mass spectrometer, by Agilent Technologies (1 mentions) Ltq orbitrap xl mass spectrometer, by Thermo Fisher Scientific (1 mentions) Combiflash rf flash chromatography system, by Teledyne (1 mentions) Inova 500 nmr instrument, by Agilent Technologies (1 mentions) Rp 18 f254s plates, by Merck Group (1 mentions) Kieselgel 60 silica gel, by Merck Group (1 mentions) Agilent 6530 accurate mass q tof lc ms spectrometer, by Agilent Technologies (1 mentions)

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NMR spectrometer (77 citations) 400-MR spectrometer (42 citations) 400 spectrometer (26 citations) MR-400 (17 citations) Agilent NMR spectrometer (10 citations) 400-MR-NMR spectrometer (7 citations) Agilent 400-MR (7 citations) Agilent 400 MR spectrometer (5 citations) Agilent 400-MR NMR (2 citations) 400-MR NMR (2 citations)

14 protocols using agilent 400 mr nmr spectrometer

1H and 19F NMR Spectroscopy Protocol

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¹H and ¹⁹F NMR spectra were recorded on an Agilent
400-MR NMR spectrometer (Agilent Technologies, Santa Clara). The residual
solvent peak of d₆ DMSO (δ = 2.50
ppm) was used to calibrate ¹H chemical shifts.

Hebels E.R., van Steenbergen M.J., Haegebaert R., Seinen C.W., Mesquita B.S., van den Dikkenberg A., Remaut K., Rijcken C.J., van Ravensteijn B.G., Hennink W.E, & Vermonden T. (2023). Mechanistic Study on the Degradation of Hydrolysable Core-Crosslinked Polymeric Micelles. Langmuir, 39(34), 12132-12143.

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NMR Spectroscopy in Deuterated Solvent

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¹H NMR spectra were recorded
on an Agilent 400-MR NMR spectrometer
(Agilent Technologies, Santa Clara, USA.) in D₂O. The chemical
shifts were reported as δ in parts per million (ppm) and were
referenced against the residual solvent peak of D₂O (δ
= 4.79 ppm).

Mihajlovic M., Rikkers M., Mihajlovic M., Viola M., Schuiringa G., Ilochonwu B.C., Masereeuw R., Vonk L., Malda J., Ito K, & Vermonden T. (2022). Viscoelastic Chondroitin Sulfate and Hyaluronic Acid Double-Network Hydrogels with Reversible Cross-Links. Biomacromolecules, 23(3), 1350-1365.

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Analytical Procedures for Natural Compounds

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All organic solvents, such as hexane, chloroform (CHCl₃), ethyl acetate (EtOAc), methanol (MeOH) and n-butanol (n-BuOH) used for extraction and column chromatography were of analytical grade and purchased from Duksan Chemical (Anseong, Korea). 1H nuclear magnetic resonance (¹H NMR) (400 MHz) and ¹³C NMR (100 MHz) spectra were recorded on an Agilent 400-MR NMR spectrometer (Agilent Technologies, Santa Clara, CA) and TMS was used as an internal standard. Data processing was carried out with the MestReNova 6.0.2 program (Mestrelab research SI, www.mestrelab.com, 2009). HRESIMS spectra were obtained using an Agilent 6550 iFunnel Q-TOF liquid chromatography/mass spectrometry (LC/MS) system (Agilent Technologies, Santa Clara, CA). Preparative high-performance liquid chromatography (HPLC) was carried out using an Agilent 1260 HPLC system. Column chromatography was performed on silica gel (Kieselgel 60, 70–230 mesh and 230–400 mesh, Merck, Darmstadt, Germany) and YMC RP-18 resins (Fuji Silysia Chemical, Aichi, Japan). Dulbecco's modified Eagle's medium (DMEM) and fetal bovine serum (FBS) were obtained from Gibco BRL. Co. Glutamate and 6-hydroxy-2,5,7,8-tetramethylchroman-2-carbboxylic acid (trolox), 3-(4,5-dimethylthiazol-2-yl)- 2,5- diphenyl tetrazolium bromide (MTT) and scopolamine were purchased from Sigma (USA).

Yoo G., Park S.J., Lee T.H., Yang H., Baek Y.S., Kim N., Kim Y.J, & Kim S.H. (2015). Flavonoids isolated from Lespedeza cuneata G. Don and their inhibitory effects on nitric oxide production in lipopolysaccharide-stimulated BV-2 microglia cells. Pharmacognosy Magazine, 11(43), 651-656.

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NMR Spectroscopy of Functionalized Biopolymers

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The NMR spectra of the functionalized biopolymers HAMA, CS-TBA, and CSMA were recorded on an Agilent 400-MR NMR spectrometer (Agilent Technologies, Santa Clara, CA, USA) in D₂O. The chemical shifts were reported as δ in parts per million (ppm) and were calibrated against a residual solvent peak of D₂O (δ = 4.79 ppm) or DMSO (δ = 2.50 ppm).

Schuiringa G.H., Mihajlovic M., van Donkelaar C.C., Vermonden T, & Ito K. (2022). Creating a Functional Biomimetic Cartilage Implant Using Hydrogels Based on Methacrylated Chondroitin Sulfate and Hyaluronic Acid. Gels, 8(7), 457.

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Isolation and Identification of Natural Compounds

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All organic solvents, such as hexane, chloroform (CHCl3), ethyl acetate (EtOAc), methanol (MeOH), and n-butanol (n-BuOH) used for extraction and column chromatography were of analytical grade and purchased from Duksan Chemical (Anseong, Korea). ¹H nuclear magnetic resonance (NMR) (400 MHz) and ¹³C NMR (100 MHz) spectra were recorded on an Agilent 400-MR NMR spectrometer (Agilent Technologies, Santa Clara, CA), and tetramethylsilane was used as an internal standard. Data processing was carried out with the MestReNova 6.0.2 program. HRESIMS spectra were obtained using an Agilent 6550 iFunnel quadrupole-time of flight (Q-TOF) liquid chromatography/mass spectrometry (LC/MS) system (Agilent Technologies, Santa Clara, CA). Preparative high-performance LC (HPLC) was carried out using an Agilent 1260 HPLC system. Column chromatography was performed on silica gel (Kieselgel 60, 70–230 mesh and 230–400 mesh, Merck, Darmstadt, Germany) and YMC RP-18 resins (Fuji Silysia Chemical, Aichi, Japan).

Yoo G., Park S., Yang H., Nguyen X.N., Kim N., Park J.H, & Kim S.H. (2017). Two New Phenolic Glycosides from the Aerial Part of Dryopteris erythrosora. Pharmacognosy Magazine, 13(52), 673-676.

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NMR Spectroscopy: Chloroform Calibration

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¹H NMR (400
MHz) was measured on an Agilent 400-MR NMR spectrometer
(Agilent Technologies, Santa Clara, USA). The chemical shifts were
calibrated against residual solvent peaks of CDCl₃ (δ
= 7.26 ppm).

Hembury M., Beztsinna N., Asadi H., van den Dikkenberg J.B., Meeldijk J.D., Hennink W.E, & Vermonden T. (2018). Luminescent Gold Nanocluster-Decorated Polymeric Hybrid Particles with Assembly-Induced Emission. Biomacromolecules, 19(7), 2841-2848.

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Polymer Characterization by NMR

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The PEG macroinitiator
and synthesized polymers were characterized
with ¹H NMR spectroscopy using an Agilent 400 MR-NMR spectrometer
(Agilent Technologies, Santa Clara, CA). Chemical shifts are referred
to the residual solvent peak (δ = 7.26 ppm for CDCl₃ and δ = 4.80 ppm for D₂O). Data analysis was performed
using MestReNova Software version 10.0.1-14719.

Fliervoet L.A., Lisitsyna E.S., Durandin N.A., Kotsis I., Maas-Bakker R.F., Yliperttula M., Hennink W.E., Vuorimaa-Laukkanen E, & Vermonden T. (2019). Structure and Dynamics of Thermosensitive pDNA Polyplexes Studied by Time-Resolved Fluorescence Spectroscopy. Biomacromolecules, 21(1), 73-88.

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NMR Spectra Analysis Protocol

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¹H, ¹³C, and ¹H–¹³C
heteronuclear single quantum correlation (HSQC) NMR spectra were recorded
on an Agilent 400-MR NMR spectrometer (Agilent Technologies, Santa
Clara, USA). Residual solvent peaks of CDCl₃ (δ =
7.26 ppm) or DMSO-d₆ (δ = 2.50 ppm)
were used to calibrate chemical shifts.

Hebels E.R., Bindt F., Walther J., van Geijn M., Weterings J., Hu Q., Colombo C., Liskamp R., Rijcken C., Hennink W.E, & Vermonden T. (2022). Orthogonal Covalent Entrapment of Cargo into Biodegradable Polymeric Micelles via Native Chemical Ligation. Biomacromolecules, 24(10), 4385-4396.

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NMR Spectra Acquisition Protocol

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NMR spectra were
recorded using an Agilent 400-MR NMR spectrometer (Agilent Technologies,
Santa Clara, CA, USA). Approximately 5 mg of analyte was dissolved
in 0.6 mL of deuterated solvent. Either DMSO-D₆ (δ
= 2.50 ppm) or CDCl₃ (δ = 7.26 ppm) was used as solvent,
and the chemical shifts of analytes were calibrated according to the
residual solvent peaks visible in the spectra.

Annala A., Ilochonwu B.C., Wilbie D., Sadeghi A., Hennink W.E, & Vermonden T. (2022). Self-Healing Thermosensitive Hydrogel for Sustained Release of Dexamethasone for Ocular Therapy. ACS polymers Au, 3(1), 118-131.

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Polymer Composition and Molecular Weight Determination

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The composition of the polymers was determined by ¹H NMR analysis performed with a 400 MHz Agilent 400-MR NMR spectrometer (Agilent Technologies, Santa Clara, USA) in DMSO-d6. The ratio HPMA/PDTEMA was determined by comparison of the integrals at δ 4.6 ppm (bs, CH₂CHCH₃O, HPMA) and the integral at δ8.5 ppm (bs, pyridyl group proton, PDTEMA) (∫δ_4.6/∫δ_8.5). The integral ratios between δ4.2 ppm (bs, OCH₂CH₂), HPMA–DMAE) and δ4.6 ppm (bs, CH₂CHCH₃O, HPMA–DMAE) were used to verify reaction between DMAE-CI and hydroxyl groups in the polymer from HPMA.
The number average molecular weight (M_n) of the polymers was determined according to equation (1).

M_{n} = (\int δ_{4.6} \times M_{(HPMA ∕ HPMA - DMAE} + \int δ_{8.5} \times M_{PDTEMA}) ∕ (\int δ_{3.5} ∕ 448) + 5000 (g ∕ mol)

where, ∫δ_3.5, ∫δ_4.6 and ∫δ_8.5 are the integrals at 3.5, 4.6, and 8.5 ppm, respectively. M_HPMA, M_HPMA–DMAE and M_PDTEMA are the molar masses of HPMA, HPMA–DMAE and PDTEMA, respectively. The number of protons for the 5000 Da PEG block, at ∫δ_3.5, was set at 448.

Novo L., Rizzo L.Y., Golombek S.K., Dakwar G.R., Lou B., Remaut K., Mastrobattista E., van Nostrum C.F., Jahnen-Dechent W., Kiessling F., Braeckmans K., Lammers T, & Hennink W.E. (2014). Decationized polyplexes as stable and safe carrier systems for improved biodistribution in systemic gene therapy. Journal of controlled release : official journal of the Controlled Release Society, 195, 162-175.

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