Formation of κ-carrageenan–gelatin polyelectrolyte complexes studied by 1 H NMR, UV spectroscopy and kinematic viscosity measurements

2016 ◽  
Vol 151 ◽  
pp. 1152-1161 ◽  
Author(s):  
Nicolay G. Voron’ko ◽  
Svetlana R. Derkach ◽  
Mikhail A. Vovk ◽  
Peter M. Tolstoy
2012 ◽  
Vol 499 ◽  
pp. 99-103
Author(s):  
Jun Chang ◽  
Cheng Wu Li ◽  
Gang Li

A series of polyesters containing 5-fluorouracil in the main chain were prepared by reacting potassium salt of 5-fluorouracil with different molecular weight ω-chloroalkyl chloroacetyl esters.The copolymers were characterized by FT-IR, 1H-NMR, VPO and UV spectroscopy. The drug release profile in vitro of the copolymers were studied, the results showed prodrug could slow release 5-FU or 5-FU units in different solution, they may be likely to become potential antitumor prodrug.


2009 ◽  
Vol 23 (2) ◽  
pp. 103-111 ◽  
Author(s):  
Changyun Chen ◽  
Kai Chen ◽  
Qi Long ◽  
Meihua Ma ◽  
Fei Ding

A novel complex Sm(III) complex with ofloxacin was synthesized and characterized on the basis of elemental analyses, molar conductivities, IR spectra, thermal analysis (TG-DSC),1H-NMR spectra. Then, spectrometric titration, ethdium bromide displacement experiments by UV spectroscopy, ionic influence, viscosity measurements and Circular Dichroism (CD) spectroscopic measurements were conducted to characterize the interaction between the complex and CT-DNA. Results obtained indicate that the complex bound with CT-DNA via an intercalation mechanism. The binding constants and binding sites number of the Sm(III) complex with CT-DNA were 1.80×105l·mol−1and 1, respectively.


Author(s):  
Siti Norhafiza Mohd Khazaai ◽  
Prakash Bhuyar ◽  
Mohd Hasbi Ab. Rahim ◽  
Muhammad Hasnol Fazirin Mohd Alwi ◽  
Sih Yiting ◽  
...  

2009 ◽  
Vol 149 (1) ◽  
pp. 38-41 ◽  
Author(s):  
D. Sparks ◽  
R. Smith ◽  
V. Cruz ◽  
N. Tran ◽  
A. Chimbayo ◽  
...  

Jurnal MIPA ◽  
2015 ◽  
Vol 4 (1) ◽  
pp. 40
Author(s):  
Cindy C. Satolom

Pinang Yaki (Areca vestiaria Giseke) adalah tanaman endemik Sulawesi Utara yang berkhasiat untuk mengobati berbagai penyakit. Penelitian sebelumnya menyatakan bahwa biji dan kulit Pinang Yaki mengandung flavonoid (Samosir et al., 2012; Mamonto et al., 2014). Sekarang akan dilaporkan Isolasi Senyawa Flavonoid dari biji Pinang Yaki. Metoda yang dilakukan sebagai berikut: Ekstrak metanol difraksinasi dengan n-heksan, etil asetat dan air. Fraksi etil asetat dimurnikan dengan metode Kromatografi Lapis Tipis Kresgel G60 F254 dan Kromatografi Kolom dengan berbagai pelarut, setiap pemisahan dipandu dengan AlCl3 5% dalam etanol yang menampakan warna khas dari flavonoid. Isolat murni yang didapatkan selanjutnya dikarakterisasi dengan menggunakan metode spektroskopi UV dan H-NMR. Isolat murni yang diperoleh diduga adalah Afzelekin.Pinang Yaki (Areca vestiaria Giseke) is a endemic plant of North sulawesi that efficacious for various disease treatment. Same research reported that Pinang Yaki seed and skin seed contain Flavonoid compound (Samosir et al., 2012; Mamonto et al., 2014).  This research reported isolation of Flavonoid compound from Pinang Yaki seed, The methods is: methanol ekstract fractionating with n-hexane, ethyl acetate dan aquades. Ethyl acetate fraction was purified by Thin Layer Chromatography Kresgel G60 F254 method and Column Chromatography with various solvent, every separation guided by 5% AlCl3 in ethanol which reveals the typical colour of Flavonoid compound. After that, the obtained pure isolates was characterized by various UV-Spectroscopy and H-NMR methods. The structure of isolate compound predicted as Afzelechin.


1975 ◽  
Vol 30 (3-4) ◽  
pp. 245-248 ◽  
Author(s):  
Georg Uray ◽  
Erich Ziegler

The adducts from carboxylicacid chlorides and -anhydrides of aromatic Schiff-Bases differ fundamentally in their spectroscopic behavior compared with the hydrochlorides. A real addition on the azomethine double-bond is shown by 1H NMR, 13C NMR and UV spectroscopy.


2011 ◽  
Vol 284-286 ◽  
pp. 1728-1731
Author(s):  
Jun Chang ◽  
Cheng Wu Li ◽  
Gang Li

A series of polyesteramide containing 5-fluorouracil in the main chain were prepared by reacting potassium salt of 5-fluorouracil with N-(2-chloroacetoxylalkyl)-chloroacetamide.The copolymers were characterized by FT-IR, 1H-NMR, VPO and UV spectroscopy. The drug release profile in vitro of the copolymers were studied, the results showed prodrug could slow release 5-FU or 5-FU units in different solution, they may be likely to become potential antitumor prodrug.


1992 ◽  
Vol 63 (9) ◽  
pp. 4196-4199 ◽  
Author(s):  
Franz Rosenberger ◽  
J. Iwan ◽  
D. Alexander ◽  
Wei‐qing Jin

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