Porcine mucosal heparin was fragmented into low-molecular-weight (LMW) heparin by treatment of periodate-oxidized heparin with sodium hydroxide, followed by reduction with sodium borohydride and acid hydrolysis. Gradient polyacrylamide gel electrophoresis analysis showed a mixture of heparin fragments with an average size of eight disaccharide units. 1D 1H NMR showed two-thirds of the N-acetyl ...

New material UCB-1 is synthesized via the delamination of zeolite precursor MCM-22 (P) at pH 9 using an aqueous solution of cetyltrimethylammonium bromide, tetrabutylammonium fluoride, and tetrabutylammonium chloride at 353 K. Characterization by powder X-ray diffraction, transmission electron microscopy, and nitrogen physisorption at 77 K indicates the same degree of delamination in UCB-1 as p...

Variable temperature EPR spectra of KNilOß • 0.5 H2O have established that the paramagnetic behavior of this compound (~ 1 BM) is due to the presence of nickel(III) atoms which have occupied some nickel(IV) sites in the crystal lattices. Change of spectral pattern from rhombic (77 K) to isotropic (300 K) is due to a dynamic Jahn-Teller effect. Electrical conductivity measurement has shown it to...

In title salt, C(38)H(34)P(2) (2+)·2IO(4) (-), the P atoms of the dication and the I atoms of the periodate anions are each in a slightly distorted tetra-hedral environment. In the dication, the two -P(C(6)H(5))(3) groups adopt a gauche conformation with respect to each other. In the crystal, several C-H⋯O hydrogen bonds between the cations and anions lead to a two-dimensional arrangement along...

in this study, bis(salicylaldehyde)-4-methyl-1,2-phenylenediimine (bsmp) as a schiff base ligand of n2o2-type and its mn and fe complex as m-bsmp catalyst were synthesized and characterized by uv-vis, ir spectroscopy and elemental analysis. the efficiency of fe- and mn-bsmp catalysts was evaluated in the oxidative decarboxylation of arylacetic acids with tetra-butylammonium periodate (n-bu4nio4...

a catalytic spectrophotometric method for determination of ultra-trace quantities of manganese(ii) id described. the method is based on the catalytic effect of manganese(ii) on the oxidation reaction of ferroin by potassium periodate in acidic media. the reaction is monitored spectrophotometrically at 510 nm by a slope method and mn(ii) is determinable in the range of 1-1000ngml-1. the limit of...

This study aimed to evaluate the effect of size press coating on two types recycled papers using different nanofibrillated cellulose (NFC) and cationic starch (CS) physical mechanical properties. Wheat straw was used as a source, NFC obtained through oxidative enzymatic pretreatments. Recycled fluting coreboard were coated with starch/NFC blends at various concentrations (0.5%, 1%, 2%, 3%, 4%) ...

New p-tert-butyl thiacalix[4]arenes differently substituted at the lower rim with amide, hydroxyl and ester groups were synthesized. Binding properties of the compounds toward some tetrabutylammonium salts n-Bu(4)NX (X = F(-), Cl(-), Br(-), I(-), CH(3)CO(2)(-), H(2)PO(4)(-), NO(3)(-)) were studied by UV spectroscopy. It was found that the stoichiometry of the complexes, generally, is 1 : 1, and...