Evaluations of Spectral Analysis of in vitro 2D-COSY and 2D-NOESY on Human Brain Metabolites.
- Author:
Bo Young CHOE
1
;
Dong Cheol WOO
;
Sang Young KIM
;
Chi Bong CHOI
;
Sung Im LEE
;
Eun Hee KIM
;
Kwan Soo HONG
;
Young Ho JEON
;
Chaejoon CHEONG
;
Sang Soo KIM
;
Hyang Sook LIM
Author Information
1. Department of Biomedical Engineering, College of Medicine, The Catholic University of Korea, Seoul, Korea. bychoe@catholic.ac.kr
- Publication Type:In Vitro ; Original Article
- Keywords:
Magnetic resonance spectroscopy (MRS);
2D-MR;
COSY;
NOESY
- MeSH:
Aspartic Acid;
Brain;
Choline;
Creatine;
Glutamic Acid;
Glutamine;
Humans;
Lactic Acid;
Protons;
Spectrum Analysis
- From:Journal of the Korean Society of Magnetic Resonance in Medicine
2008;12(1):8-19
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
PURPOSE: To investigate the 3-bond and spatial connectivity of human brain metabolites by scalar coupling and dipolar nuclear Overhauser effect/enhancement (NOE) interaction through 2D- correlation spectroscopy (COSY) and 2D- NOE spectroscopy (NOESY) techniques. MATERIALS AND METHODS: All 2D experiments were performed on Bruker Avance 500 (11.8 T) with the zshield gradient triple resonance cryoprobe at 298 K. Human brain metabolites were prepared with 10% D2O. Two-dimensional spectra with 2048 data points contains 320 free induction decay (FID) averaging. Repetition delay was 2 sec. The Top Spin 2.0 software was used for post-processing. Total 7 metabolites such as N-acetyl aspartate (NAA), creatine (Cr), choline (Cho), glutamine (Gln), glutamate (Glu), myo-inositol (Ins), and lactate (Lac) were included for major target metabolites. RESULTS: Symmetrical 2D-COSY and 2D-NOESY spectra were successfully acquired: COSY cross peaks were observed in the only 1.0-4.5 ppm, however, NOESY cross peaks were observed in the 1.0-4.5 ppm and 7.9 ppm. From the result of the 2-D COSY data, cross peaks between the methyl protons (CH3(3)) at 1.33 ppm and methine proton (CH(2)) at 4.11 ppm were observed in Lac. Cross peaks between the methylene protons (CH2(3,H alpha)) at 2.50ppm and methylene protons (CH2,(3,HB)) at 2.70 ppm were observed in NAA. Cross peaks between the methine proton (CH(5)) at 3.27 ppm and the methine proton (CH(4,6)) at 3.59 ppm, between the methine proton (CH(1,3)) at 3.53 ppm and methine proton (CH(4,6)) at 3.59 ppm, and between the methine proton (CH(1,3)) at 3.53 ppm and methine proton (CH(2)) at 4.05 ppm were observed in Ins. From the result of 2-D NOESY data, cross peaks between the NH proton at 8.00 ppm and methyl protons (CH3) were observed in NAA. Cross peaks between the methyl protons (CH3(3)) at 1.33 ppm and methine proton (CH(2)) at 4.11 ppm were observed in Lac. Cross peaks between the methyl protons (CH3) at 3.03 ppm and methylene protons (CH2) at 3.93 ppm were observed in Cr. Cross peaks between the methylene protons (CH2(3)) at 2.11 ppm and methylene protons (CH2(4)) at 2.35 ppm, and between the methylene protons(CH2 (3)) at 2.11 ppm and methine proton (CH(2)) at 3.76 ppm were observed in Glu. Cross peaks between the methylene protons (CH2 (3)) at 2.14 ppm and methine proton (CH(2)) at 3.79 ppm were observed in Gln. Cross peaks between the methine proton (CH(5)) at 3.27 ppm and the methine proton (CH(4,6)) at 3.59 ppm, and between the methine proton (CH(1,3)) at 3.53 ppm and methine proton (CH(2)) at 4.05 ppm were observed in Ins. CONCLUSION: The present study demonstrated that in vitro 2D-COSY and NOESY represented the 3-bond and spatial connectivity of human brain metabolites by scalar coupling and dipolar NOE interaction. This study could aid in better understanding the interactions between human brain metabolites in vivo 2DCOSY study.
