ChemInform Abstract: CONFORMATIONAL ANALYSIS ABOUT N-N′-BOND BY NMR SPECTROSCOPY, N′-DERIVATIVES OF N-AMINO-9,10-DIHYDROANTHRACENE-9,10-ENDO-ALPHA-METHYL-ALPHA,BETA-SUCCINIMIDE

1974 ◽  
Vol 5 (44) ◽  
pp. no-no
Author(s):  
S. M. VERMA ◽  
K. O. P. SINHA
Keyword(s):  
Nmr Spectroscopy ◽  
Conformational Analysis ◽  
Alpha Beta ◽  
Derivatives Of

Monitoring the encapsulation of chlorin e6 derivatives into polymer carriers by NMR spectroscopy

2019 ◽  
Vol 23 (11n12) ◽  
pp. 1576-1586 ◽  
Author(s):  
Sara Pfister ◽  
Luca Sauser ◽  
Ilche Gjuroski ◽  
Julien Furrer ◽  
Martina Vermathen
Keyword(s):  
Relaxation Time ◽  
Nmr Spectroscopy ◽  
Core Region ◽  
Chlorin E6 ◽  
Polypropylene Glycol ◽  
Polymer Carriers ◽  
H Nmr ◽  
Line Shape Analysis ◽  
Dynamic Methods ◽  
Derivatives Of

The encapsulation of five derivatives of chlorin e6 with different hydrophobicity and aggregation properties into a series of five poloxamer-type triblock copolymer micelles (BCMs) with varying numbers of polyethylene and polypropylene glycol (PEG, PPG) units was monitored using 1H NMR spectroscopy. NMR chemical shift and line shape analysis, as well as dynamic methods including diffusion ordered spectroscopy (DOSY) and T1 and T2 relaxation time measurements of the chlorin and the polymer resonances, proved useful to assess the chlorin–BCM compatibility. The poloxamers had high capability to break up aggregates formed by chlorins up to intermediate hydrophobicity. Physically entrapped chlorins were always localized in the BCM core region. The loading capacity correlated with chlorin polarity for all poloxamers among which those with the lowest number of PPG units were most efficient. DOSY data revealed that relatively weakly aggregating chlorins partition between the aqueous bulk and micellar environment whereas more hydrophobic chlorins are well retained in the BCM core region, rendering these systems more stable. T1 and T2 relaxation time measurements indicated that motional freedom in the BCM core region contributes to encapsulation efficiency. The BCM corona dynamics were rather insensitive towards chlorin entrapment except for the poloxamers with short PEG chains. The presented data demonstrate that 1H NMR spectroscopy is a powerful complementary tool for probing the compatibility of porphyrinic compounds with polymeric carriers such as poloxamer BCMs, which is a prerequisite in the development of stable and highly efficient drug delivery systems suitable for medical applications like photodynamic therapy of tumors.

Conformational analysis and steric effects of substituents in derivatives of 3-oxo-, 3-imino-, and 3-methylenecyclohexene

1997 ◽  
Vol 46 (11) ◽  
pp. 1891-1896
Author(s):  
O. V. Shishkin ◽  
E. V. Solomovich ◽  
M. Yu. Antipin ◽  
A. S. Petrenko ◽  
L. A. Kutulya
Keyword(s):  
Conformational Analysis ◽  
Steric Effects ◽  
Derivatives Of
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