- Interfacial synthesis and properties of l-lysine-derived optically active poly(ester-imide)s
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l-Lysine hydrochloride was transformed to ethyl l-lysine dihydrochloride. This salt was reacted with trimellitic anhydride to yield the corresponding diacid (1). Interfacial polycondensation results novel poly(ester-imide)s (PEIa-i). These polymers have inherent viscosities in the range of 0.23-0.47 dl g-1, display optical activity, and are readily soluble in polar aprotic solvents. They start to decompose (T10%) above 350 °C and display glass-transition temperatures at 100.42-172.81 °C. All of the above polymers were fully characterized by UV, FT-IR and 1H NMR spectroscopy, elemental analysis, TGA, DSC, inherent viscosity measurement and specific rotation.
- Zahmatkesh, Saeed,Alborzi, Ali Reza,Sadeghi, Javad,Zare, Karim
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scheme or table
p. 607 - 610
(2012/02/01)
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- Optically active: Microwave-assisted synthesis and characterization of l-lysine-derived poly (amide-imide)s
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l-lysine hydrochloride was transformed to ethyl l-lysine dihydrochloride. This salt was reacted with trimellitic anhydride to yield the corresponding diacid (1). Microwave-assisted polycondensation results a series of novel Poly (amide-imide)s (PAI a-i ). These polymers have inherent viscosities in the range of 0.23-0.66 dl g-1, display optical activity from +8.02 to +15.11 (as there is no obvious regioselectivity between alpha and epsilon amino groups of the chiral diacid during the polymerization step then random orientation of diacid moieties along the polymer backbone can be predicted and the concept of "tacticity" cannot be addressed in this research), and are readily soluble in polar aprotic solvents. They start to decompose (T 10%) above 362°C and display glass-transition temperatures at 119-153°C. All of the above polymers were fully characterized by UV, FT-IR and 1H NMR spectroscopy, elemental analysis, thermogravimetric analyses, DSC, inherent viscosity measurement and specific rotation.
- Alborzi, Ali Reza,Zahmatkesh, Saeed,Zare, Karim,Sadeghi, Javad
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experimental part
p. 485 - 494
(2012/04/10)
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- Synthesis and antimicrobial characterization of novel l-lysine gemini surfactants pended with reactive groups
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A series of novel quaternary ammonium gemini surfactants of l-lysine containing ester group were synthesized with high yield rate. The antibacterial and antifungal activities of these gemini surfactants were evaluated by quantifying the minimal inhibitory concentration (MIC). The results indicated that the quaternary ammonium gemini surfactants exhibited improved activity against a broad spectrum of Gram-positive and Gram-negative bacteria as well as fungi. The pended ester group provides a reactive site for incorporating the surfactant into polymers, thus leading to the polymers with high antimicrobial efficiency.
- Tan, Hong,Xiao, Huining
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p. 1759 - 1761
(2008/09/18)
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- Racemization of an optically active lysine alkyl ester
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An optically active lysine alkyl ester.dihydrochloride is racemized by heating at 100° C. to 250° C. under an atmosphere of hydrogen. By combining this process with asymmetric hydrolysis of racemic lysine alkyl ester with enzymes, racemic lysine alkyl ester can be converted all to L-lysine.
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