scholarly journals Kajian Kimia Dari Fraksi Etil Asetat Kulit Batang Kayu Pahit (Picrasma Javanica Bl.)

2015 ◽  
Vol 2 (1) ◽  
pp. 1
Author(s):  
Sri Hainil ◽  
Dayar Arbain ◽  
Deddi Prima Putra
Keyword(s):  
Quantum Correlation ◽  
Multiple Bond ◽  
Single Quantum ◽  
Heteronuclear Multiple Bond Correlation ◽  
Heteronuclear Single Quantum Correlation

 Senyawa utama N-1 dari fraksi etil asetat kulit batang kayu pahit (Picrasma Javanica Bl) telah diisolasi dan dikarakterisasi dengan kromatografi kolom dan dilanjutkan dengan kromatografi preparatif. elusidasi struktur dan analisis data spektrum yang digunakan ultraviolet (UV) spektroskopi, infra merah (IR), 1H RMI (Resonansi Magnet Inti), 13C RMI, Massa, COSY (Correlated Spectroscopy), HSQC (Heteronuclear Single Quantum Correlation), HMBC (Heteronuclear Multiple Bond Correlation) dan studi literatur menunjukkan bahwa senyawa yang isolasi adalah Javanicin A. 

scholarly journals CARACTERIZACIÓN DE UNA ESPIROLACTONA SESQUITERPÉNICA á-METILÉNICA OBTENIDA DE Ambrosia arborescens Miller Y EVALUACIÓN DE SU ACTIVIDAD BIOLÓGICA EN Tripanosoma cruzi

2014 ◽  
Vol 80 (2) ◽  
pp. 124-135
Author(s):  
Teresa Cano de Terrones
Keyword(s):  
Quantum Correlation ◽  
Multiple Bond ◽  
Correlation Spectroscopy ◽  
Single Quantum ◽  
Heteronuclear Multiple Bond Correlation ◽  
Heteronuclear Single Quantum Correlation ◽  
América Del Sur

Ambrosia arborescens Miller, denominada comúnmente "marco"; es una planta aromática, medicinal que se encuentra en América del Sur, mayormente en los Andes del Perú, en el Departamento de Arequipa. El estudio de los constituyentes químicos de la parte aérea de Ambrosia arborescens permitió obtener una espirolactona sesquiterpénica. Para su separación y aislamiento se utilizó métodos cromatográficos de columna, capa fina y cromatografía líquida de alta eficacia. La elucidación estructural se realizó a través de métodos espectroscópicos: resonancia magnética nuclear protónica (RMN-1H), del carbono-13 (RMN-13C), espectroscopía infrarroja (IR) y espectrometría de masas (EM). En la determinación de la estereoquímica y las conformaciones se empleó experimentos bidimensionales de espectroscopía: COSY (Correlation Spectroscopy), HSQC (Heteronuclear Single Quantum Correlation), HMBC (Heteronuclear Multiple Bond Correlation) y ROESY(Rotational nuclear Overhouser Effect Spectroscopy). Desde un punto de vista teórico, el análisis conformacional fue realizado a través de Mecánica Molecular empleando el programa MM2 de Hyperchem. La evaluación de la actividad antiparasitaria, in vitro, sobre Tripanosoma cruzi, mostró que a muy bajas concentraciones, el producto obtenido presenta actividad tripanocida.

scholarly journals Chemical Constituents of Tagetes patula and Their Neuroprotecting Action

2020 ◽  
Vol 15 (11) ◽  
pp. 1934578X2097450
Author(s):  
Linlin Liu ◽  
Simin Luo ◽  
Miao Yu ◽  
Ahmed M. Metwaly ◽  
Xiaoku Ran ◽  
...  
Keyword(s):  
High Performance ◽  
Chemical Constituents ◽  
Multiple Bond ◽  
Tagetes Patula ◽  
Chemical Methods ◽  
Heteronuclear Multiple Bond Correlation ◽  
Flight Mass Spectrometry ◽  
Whole Plant ◽  
Heteronuclear Single Quantum Correlation ◽  
Neuroprotective Action

Two novel flavonoids (1, 2) and 3 known compounds (3-5) were isolated from the flowers and whole plant of Tagetes patula L., and their structures were elucidated by means of ultra-high performance liquid chromatography with electrospray ionization, coupled to quadrupole-time-of-flight/mass spectrometry, 1H and 13C-nuclear magnetic resonance (NMR), as well as 2-dimensional-NMR (heteronuclear single quantum correlation and heteronuclear multiple bond correlation) and chemical methods. In addition, all the compounds were examined for their neuroprotective action on the injury of SH-SY5Y cells induced by glutamate, indicating that the protective effect of these compounds on glutamate-induced SH-SY5Y cell was marigold biflavone > patuletin > quercetin > kaempferol-3- O-β-d-glucoside > patuletin-3- O-α-l-arabinopyranoside. Thus, it could be concluded that flavonoids played a key role in the neuroprotective action of T. patula.

scholarly journals Proton-detected heteronuclear single quantum correlation NMR spectroscopy in rigid solids with ultra-fast MAS

2010 ◽  
Vol 202 (1) ◽  
pp. 64-71 ◽  
Author(s):  
Gregory P. Holland ◽  
Brian R. Cherry ◽  
Janelle E. Jenkins ◽  
Jeffery L. Yarger
Keyword(s):  
Nmr Spectroscopy ◽  
Quantum Correlation ◽  
Single Quantum ◽  
Fast Mas ◽  
Heteronuclear Single Quantum Correlation

ASSIGNMENT OF NMR SIGNALS FOR CHLOROPRENE RUBBER BY TWO-DIMENSIONAL NMR SPECTROSCOPY

2013 ◽  
Vol 86 (2) ◽  
pp. 250-260
Author(s):  
Takayuki Saito ◽  
Seiichi Kawahara ◽  
Yoshito Ohtake
Keyword(s):  
Nmr Spectroscopy ◽  
1H Nmr ◽  
13C Nmr ◽  
Quantum Correlation ◽  
Multiple Bond ◽  
Multiple Quantum ◽  
Heteronuclear Multiple Bond Correlation ◽  
Nmr Spectrum ◽  
Chloroprene Rubber ◽  
Nmr Signals

ABSTRACT Various pulse techniques of NMR spectroscopy were applied to CR to assign some small signals in 13C and 1H NMR spectra for the rubber. First, the rubber was subjected to distortionless enhancement by polarization transfer and attached proton test. The small signals in the 13C NMR spectrum were assigned to secondary, tertiary, and quaternary carbons. Second, correlations between 13C and 1H were investigated by heteronuclear multiple quantum correlation, heteronuclear two bond correlation, and heteronuclear multiple bond correlation measurements to assign the small signals in the 13C NMR spectrum in detail. By using the resulting correlations between 13C and 1H, the small unassigned signals in 1H NMR spectrum were assigned to methylene and methine protons of the rubber.

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