Papers by Keyword: Glycine

Abstract: The study was undertaken to determine the extraction of proteins from chicken meat. The effect of buffer (phosphate, citrate and glycine) and four pH values (6.0, 7.0, 8.0 and 9.0) were investigated. The protein extractability of phosphate, citrate and glycine buffer with in the pH range (pH 6.0 to 9.0) was assessed to determine the best protein extractant for chicken meat. The maximum protein extractabilities at pH 8.0 for phosphate and citrate buffer, and at pH 9.0 for glycine buffer were observed. ANOVA analysis showed that there was no significant difference in protein extractabilities for citrate from phosphate and glycine buffer. Whereas, a significant difference was observed for phosphate buffer from glycine. However, no significant effects of pH were observed.

Abstract: The effect of pH on the material removal rate (MRR) and surface roughness (Ra) of hard disk substrate in glycine–hydrogen peroxide system abrasive-free slurry was investigated. The results show that, the MRR of hard disk substrate increases when both glycine and H2O2 are used in acidic slurries (pH=3.0) and decreases drastically in alkaline slurries (pH=10.0). The Ra of hard disk substrates is small in acidic slurries and increases drastically in alkaline slurries. Further, the effects of glycine, H2O2, and solution pH on hard disk removal were investigated by auger electron spectroscopy (AES), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization measurements. We also develop a reaction scheme describing the surface chemistry of the hard disk in this system.

Abstract: Effect of four materials including glycine, arginine, proline and sodium glutamate on survival of Bifidobacterium bifidum during freeze-drying was studied by measuring the viable counts of before and after freeze-drying. The addition of glycine, arginine, proline and sodium glutamate (%, w/v) were all 1.0%, 2.0%, 3.0%，4.0% and 5.0%. Results were as follows: addition of glycine, arginine, proline and sodium glutamate into B. bifidum paste could significantly improve the survival rate of B. bifidum and the number of viable cells of lyophilized powder. The optimal concentrations of glycine, arginine, proline and sodium glutamate were 4.0%, 4.0%, 3.0% and 2.0%, the survival of B. bifidum was 87.49%, 84.28%, 67.50% and 69.01%, respectively.

Abstract: In the present study, we demonstrate that silver colloid can serve as additive and induced the γ-form polymorph of glycine crystals in the netural solution. The silver colloid could quickly affect the packing arrangements of glycine molecules in aqueous solution leading to the competitive nucleation of the two polymorphs.

Abstract: This work shows the influence of the fuels aniline, carbohydrazide and glycine on structural and morphological characteristics of ZnAl₂O₄ synthesized by combustion reaction. Samples were prepared according to the propellants and explosives theory using a vitreous silica crucible and a muffle furnace as heating source. During the synthesis was measured the time and temperature of the reaction. After The samples were structurally and morphologically characterized by the following techniques: XRD, nitrogen adsorption / desorption (BET / BJH), and SEM. The higher temperature was achieved by the synthesis using aniline, whose value was of 876°C. XRD results showed that all the samples presented the ZnAl₂O₄ spinel as majority phase and, ZnO and Al₂O₃ as segregated phases. The samples also showed low surface area, varying of 23.6 to 28.7 m²/g, and particle size of 45 to 55 nm, besides mesoporous characteristic and irregular agglomerates formation.

Abstract: After Sepharose 4B polymer beads were activated by using epichlorohydrin, glycine was binded with them to prepare an immobilized carboxyl group ion exchange adsorbent. The coupling rate was that 18.3 mg Gly could be fixed by 1 g of wet Sepharose 4B beads. At pH 9, this adsorbent showed power adsorption to metal ions with Ca2+16.49 mg，Mg2+6.92 mg，Fe2+11.06 mg，Fe3+4.98 mg and Mn2+11.84 mg were respectively adsorbed by 20 g of wet Sepharose 4B beads during saturated adsorption. Moreover, this absorbent possessed the properties with good stability, regeneration easily and low cost.

Abstract: The long afterglow phosphor CaAl₂O₄: Eu²⁺, Nd³⁺ was prepared by combustion synthesis, and the influence of glycine on the luminescent properties of the long afterglow phosphor was studied. The samples were characterized by X-ray diffraction (XRD) and fluorescence spectroscopy (PL) etc. The results showed that the main phase of the combustion products is CaAl₂O₄ with monoclinic crystal structure. The introduction of glycine prolongs the afterglow time.

Abstract: The influence of Cu2+, Fe2+ on the Maillard reaction were studied by heating L-ascorbic(ASA) and glycine (Gly) solutions adjusted to pH 5 at 120±2°C for 140 min in an oil bath. The presence of metals affected the intensity of browning and intermediate products, as monitored by absorbance at 420 nm and absorbance at 294 nm, sharply increased with the increase of metal concentrations applied (0.000M, 0.005M, 0.010M, 0.015M, 0.020M). Thereafter, slight increases were observed up to 0.020M. Antioxidative activity of all MRPs derived from ASA-Gly model systems sharply increased at 0.015M (P < 0.05) and slightly changes in activity were found with increasing metal concentrations up to 0.020M. Moreover, radical-scavenging activity correlated well with browning intensity and absorbance at 294 nm.

Abstract: A two-step reaction approach in alcohol, which comprised a step of monochoroacetic acid reacting with ammonia and a step of the resulted ammonium monochloroacetate reacting with ammonia in presence of urotropine as catalyst, was employed to synthesize glycine. Operating conditions for synthesizing glycine and for purifying glycine product were investigated through intensive experimental approach. The optimal operating conditions for the whole process including synthesis and purification of glycine were obtained and tested. Under such conditions, for methanol as reaction media and for methanol aqueous solution as separating agent, the glycine product yield reaches 92.9% with a purity of 99.7%, whereas for methanol as reaction media and for ethanol aqueous solution as separating agent, the glycine product yield is 89.5% with a purity of 98.6%.

Abstract: A series of Ferrocene Schiff bases derived from glycine and their cobalt (II), copper (II), nickel (II), and zinc (II) metal complexes have been synthesized and characterized by IR, 1H NMR, MS and elemental analysis, the results conformed well with expected structures. The synthesized ligands, along with their metal (II) complexes, were screened in vitro for their antibacterial activity against three Gram-negative (Escherichia coli, Pseudomonas aeruginosa, and Salmonella typhi) and two Gram-positive (Bacillus subtilis and Staphylococcus aureus) bacterial strains. The results showed that the metal (II) complexes are more potent in antibacterial activity against one or more species in comparison with those of uncomplexed ligands.