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StrategiesofNMRResonanceAssignment
forBiofluidSamples
生物體液的核磁共振譜峰歸屬900MHz1H1DNMRSpectrumofHumanUrine1HNMRspectrumofTaxolC47H51NO14PublicNMRDatabaseofBiologicalsamples-1HMDB(HumanMetabolomeDatabase)www.hmdb.ca
Version3.5Chemical,Clinical,Molecularbiology/biochemistrydata
40,444metabolites1D(1Hand13C)&2D(COSY,TOCSYandHSQC)NMRdata
MMCD
(MadisonMetabolomicsConsortiumDatabase)Chemical,physical,clinical,molecularbiology/biochemistrydata
20,306metabolites1D(1Hand13C)&2D(COSY,TOCSY,HMBCandHSQC)NMRdataPublicNMRDatabaseofBiologicalsamples-2
BMRB
(BiologicalMagneticResonanceBank)Chemicalandphysicaldata,NMRpulsesequencesPeptides,proteinandnucleicacidChemicalshift,J-couplings,relaxationrates,hydrogenexchangeratesandpKavaluesMetabolomicsdatabasePublicNMRDatabaseofBiologicalsamples-3PersonalNMRDatabaseofBiologicalsamplesApproximateprotonchemicalshifts3.7-5.0ppmAlphaHtoether3.1-4.4ppmAlphaHtohalogen2.1-2.6ppmAlphaHtoCarbonyl0.7-1.7ppmAlkaneCH2.1-3.0ppmAlphaHtoaminonitrogen2.3-2.7ppmAlphaHtoBenzylic6.5-8.0ppmAromaticH9.0-10.0ppmAldehydeH5.0-9.0ppmAmideH3.55-4.0ppmAlphaHtoaminoacid3.3-4.0ppmAlphaHtooxygenFromsampletostructure1D1H
spectrum2D1H-1HJRES2D
1H-1HCOSY2D
1H-1HTOCSY2D
1H-13CHSQC(HMQC)2D
1H-13CHMBC2D
1H-1HNOESY??Noesypr1DCPMGDiffusionWeight1D1HNMRmethodSeparatethesignalswithoutseparatingthesamples!△PFGttn1H-1HJ-resolvedspectroscopySplitpattern:n+1SpinsystemAX2
(CH-CH2)JAXd(F2)J(F1)0Hz1:2:11:1TiltAX2DJ-RevolvedSpectroscopyF1(Hz)F2(ppm)01H-1Hcouplingconstants1Henvironment
JHHrange[Hz]–CH2-CH3
3J=7~8R2–CH2
2J=-10~-18-N=CH22J=8~16
3Jtrans=12~24,3Jcis=3-18,2JG=-3~7
3JO=5~9,4Jm=2~3,5Jp=0~1JcouplingconstantsarehelpfultoobtainthestructureinformationH1H2H3H4H1H2H3H4H4H3H1H2
Correlatescalarcoupledprotons
nJHH(n=2,3)SubsequentrelationshipbetweenprotonsH1R2OR1OH2H3H4H1H2H3H4
2DCOSY:COrrelation
SpectroscopYCOSYCCCCHHHHabcdabcdabcdF1(ppm)F2(ppm)H1R2OR1OH2H3H4H1H2H3H4H1H2H3H4H4H3H1H2H1H2H3H4H4H3H1H2
Identifyprotonsinthesamescalarcouplingnetwork!4JHH
5JHH2DTOCSY(TOtal
CorrelationSpectroscopY)TOCSYCCCCHHHHabcdabcdabcdF1(ppm)F2(ppm)2D1H-13CHMQC/HSQCHeteronuclear
MultipleQuantumCoherence
Heteronuclear
SingleQuantumCoherenceCorrelate1H-13Cchemicalshiftsviaone-bond1JC-H
couplings2DHMQC/HSQCH1H3H4H2aC4
C1C2C313C(ppm)H2b1H(ppm)4CH3CCHHHCH312b32aCRRRRCORR?HMQCorHSQC?HMQC:+
Lesspulses
tolerancetoexperimentalimperfections-
Indirect1H-1HcouplingsinF1
lowerresolutionHSQC:
+
No1H-1Hcouplings
inF1
betterresolution-
Morepulses
sensitivetopulseerrorsCH3CCHHHCH31235C4OC5C3C4C1H5H4H2bH1H2aC2Maximumlongrange:3JC-H2DHMBC(Heteronuclear
MultipleBondCoherence)2DHeteronuclearCorrelatedNMRSpectroscopyF1(ppm)F2(ppm)F1(ppm)F2(ppm)HSQCHMBC2DNOESYNuclearOverhauser
EnhancedSpectroscopYHMBCTOCSYHSQCNOESYCOSYExp
F2 F1 mechanismCOSY
dH
/JHH
dH
/JHH
nJHH(n=2,3)TOCSY
dH
/JHH
dH
/JHH
nJHH(n>2)HSQC
dH
/JHH dC
1JCHHMBC
dH
/JHH dC
nJCH
(n>1)JRES
dH
nJHH(n>2)NOESY
dH
/JHH
dH
/JHH
NOE(~rHH-6)2DNMRStrategiesCCCHOCHCHHCHCH3?1D1HNMRspectroscopyJ-Resolveddd0.99ppm1.04ppm2DTOCSYJ-Resolveddd0.99ppm1.04ppm2.27ppm3.61ppmCH3CH3?“n+1”CHTOCSYCOSYCH3CH3CH2.27ppm3.61ppm0.99ppm1.04ppmCH3CH3CH?HHMBCHSQC0.99ppm1.04ppm19.5ppm20.8ppm31.9ppm63.3ppmCH3CH3CHCH??2.27ppm3.62ppm177ppm177ppmRCH3:0-40ppmRCH2:10-50ppmRCH:15-50ppmCOO160-185ppmCOONH3+Valine
TOCSYCOSY7.55ppm7.63ppm7.83ppmRR1R2R3R1R2?J-Resolved7.55ppm7.63ppm7.83ppmmmm?7.63ppm7.83ppm7.55ppm173.1ppm130.1ppm135.3ppm131.5ppm3.98ppm46.3ppm173.1
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