Poly allylamine

Figure 6.29 (page 205) shows the ehromatogram of poly(allylamine hydro-ehloride) using the Asahipak GF-HQ series. The peak shape is affected by ehanging the ionie strength. It was eonfirtned that the best peak shape is obtained when the eoneentration of LiCl in the eluent is 250 mM. 

FIGURE 6.29 Poly(allylamine hydrochloride). Column Shodex Asahipak GF-7I0 HQ + GF-5I0 HQ + GF-310 HQ. 7.6 mm i.d. x 300 mm x 3. Eluenc LiCI aqueous solution. Flow rate 0.6 mL/min. Detector Shodex Rl. Column temp. 50°C. Sample I %, 50 /cL Poly(allylamine hydrochloride). 

It has been found that DTBP cross-linking substantially increased the salt stability of the complexes. The salt stabilization is reversed upon the addition of DTT, which cleaves the bifunctional reagent, indicating that it is not due to the conversion of the amines to amidines and is dependent upon the cross-linking. Similar results were achieved with other polycations, including poly(allylamine), and histone HI. 

The conjugation of catechin on poly(allylamine) using ML as catalyst was examined under air. During the conjugation, the reaction mixture turned brown and a new peak at 430 nm was observed in the UV-vis spectrum. At pH 7, the reaction rate was the highest. The conjugation hardly occurred in the absence of laccase, indicating that the reaction proceeded via enzyme catalysis. 

A new composite PVA hydrogel for an artificial muscle has been prepared by a freezing and thawing method [71]. The gel contained PAA and PAAm.HCl (poly-allylamine hydrochloride). The electrocontractile behavior of the composite gel in various solutions was studied. A large stroke and better controllability have been detected in a 10 mM NaOH/7 mM Ba(OH)2 system. 

Recently, a novel hydrophylic polymer membrane based on poly(allylamine hydrochloride) (PAA.HC1)/PVA, crosslinked with GA, has been also tested for methanol dehydration by pervaporation technique [33], Even if the reported results show a small selectivity of the last type of membrane, the blend s composition, the curing degree and the process conditions (temperature, feed concentration, etc.) could be used to obtain a better separation of methanol. 

Novel hydrophilic polymer membranes based on crosslinked poly(allylamine hydrochloride) (PAA.HCl)-PVA have been developed in order to dehydrate different organic compounds by pervaporation [33], The characteristics of the acetone dehydration process,... 

In contrast to the polyacrylamide homopolymers typical of CE,Fujimoto et al. incorporated charged functionalities into the neutral polyacrylamide chains to accelerate the migration of neutral compounds through a capillary column [90]. Despite this improvement, nearly 100 min were required to effect the separation of acetone and acetophenone, making this approach impractical even with the use of high voltage. Alternatively, Tanaka et al. [86] alkylated commercial poly-allylamine with alkyl bromides, followed by a Michael reaction with... 

Lin et al. oxidized MWCNTs and followed by mixing with poly(allylamine hydrochloride) (PAH) [84]. A higher coverage of PAH was obtained when KN03 was added to increase the ionic strength of the solution. A solution containing H2PtCl6... 

A different example of gold-nanoparticle-modified electrodes for N O detection was shovm by Caruso and coworkers [66]. In this work, the layer-by-layer technique was utilized as a means to immobilize oppositely charged layers of gold-nanoparticle-loaded poly(sodium 4-styrene-sulfonate) (PSS) and poly(allylamine hydrochloride)... 

Figure 2.4 Redox-active building blocks used in LbL self-assembly. PAH-Os Osmium pyridil-bipyridil modified poly(allylamine) [28,58, 69, 72, 148, 150-154, 184, 185, 191, 203-205] ...

Sonochemical methods have been used by the Cordoba de Torresi group to prepare Ni(OH)2, Co(OH)2 and mixed Ni/Co hydroxide NPs [33, 34]. For the sonochemical synthesis, the appropriate metal nitrate was mixed with ammonium hydroxide solutions and then sonochemically irradiated for various times. This produced about 5-nm diameter metal-hydroxide NPs that were then immobilized at ITO surfaces using a LbL approach with poly(allylamine) hydrochloride (PAH). In one study, the electrochromic behavior of the LbL deposits was compared with that of bulk deposits... 

Currently available BAS include cholestyramine, colestipol and colesevelam hydrochloride (colestimide). Cholestyramine comprises a long-chain polymer of styrene with divinylbenzene trimethylbenzylammonium groups, whereas colestipol is a long-chain polymer of l-chloro-2,3-epoxypropane with diethylenetriamine. Colesevelam HCl is poly(allylamine hydrochloride) cross-linked with epichlorohydrin and alkylated with 1-bromodecane and 6-bromo-hexyl-trimethylammonium bromide. Bile-acid binding is enhanced and stabilised in the latter compound by long hydrophobic sidechains, increased density of primary amines, and quaternary amine sidechains. For this reason, colesevelam HCl exhibits increased affinity, specificity and capacity to bind bile acids compared with the other BAS. Colesevelam HCl also binds dihydroxy and trihydroxy bile acids with equal affinity, contrasting with cholestyramine and colestipol that preferentially bind dihydroxy bile acids (CDCA and deoxycholic acid). The latter BAS can lead to an imbalance towards trihydroxy bile acids and a more hydrophilic bile-acid pool. 

In work like that described in Scheme 6, Bruening reported the synthesis of multilayer composites by alternating deposition of Gantrez and the linear polyvalent nucleophile poly(allylamine) [58]. The impermeable films that were produced by this multistep hyperbranched graft chemistry were shown to passivate aluminum surfaces. 

Fig. 7.3b Schematic diagram of multilayer thin films of CdS nanoparticles on Au electrode in presence of poly allylamine hydrogen chloride.

A cell with a small Pt disk working electrode coated with a polyelectrolyte multilayer made of poly(allylamine)-poly(vinyl sulfate), a Pt wire counterelectrode and a reference SCSE may be used for selective amperometric determination of H2O2, in the presence of ascorbic acid (22), uric acid (29) and acetaminophen (148). The latter three compounds show a significant response with the bare working electrode at +0.6 V while a practically nil one with the coated electrode. The reason for this selectivity may be an exclusion effect by the coating. ... 

Ball, V., Winterhalter, M., Schwinte, P., Lavalle, P., Voegel, J.C., Schaaf, P. (2002). Complexation mechanism of bovine serum albumin and poly(allylamine hydrochloride). Journal of Physical Chemistry, 106, 2357-2364. 

First by mixing poly(vinyl alcohol) PVA (Kuraray 117H Mw 74800 saponification 99.6%), poly(acrylic acid) PAA (SP2 Mw 170000), and poly(allylamine) hydrochloride PAlAm.HCl (Nittobo Mw 60000) a homogeneous aqueous solution of PVA PAA PAlAm was obtained at concentrations of... 

Complexation of poly(allylamine hydrochloride), — (CH—(CH2NH3C1)—CH2) —, with transition metal ions in aqueous solution appears to proceed in one step, in contrast to that of the corresponding low molecular weight metal complex. Interaction between polyallylamine and Cu2+, Ni2 +, Co2+, Zn2+, and Mg2+ has been reported 21). 

The polymer, [-CH2CH(CH2NHC6H4N02-p)-]n, PPNA, was synthesized by aromatic nucleophilic substitution reaction of poly(allylamine hydrochloride) with p-fluoronitrobenzene. PPNA so prepared has mol. wt. 

Listeria monocytogenes cells partitioned between organic/ aqueous medium Poly(allylamine) used in presence of diacid chloride Polymeric microcapsules (bacteria-mediated lithography) NS Aheme et al., 1996 Whitcombe et al., 1997... 

Fazal FM, Hansen DE. Glucose-specific poly(allylamine) hydrogels a reassessment. Bioorganic Medicinal Chemistry Letters 2007, 17, 235-238. 

Polyelectrolyte multilayers (PEM) have been used to alter surface charges, thus controlling the direction of EOF in chips made of PS [155,216,416], PMMA [216], and PETG [416]. PEM deposition was carried out by exposing the micro-channel alternatively to solutions of positively charged PEM poly(allylamine hydrochloride) PAAH and negatively charged PEM-poly(styrene sulfonate), or... 

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