Papers by Keyword: Citrate

Abstract: Green synthesized surface passivated carbon dots for detection of Citrate as biomarker for prostate cancer. The carbon sources of CQDs are passivated with L-cysteine via a one-pot hydrothermal route. The quenching in emission intensity of the synthesized carbon dots (CQDs) is observed for Citrate samples. The hydroxyl and carboxylic functional groups of Citrate showed a binding affinity with amino and free carboxyl cysteine passivated over the surface of carbon dots. The CQDs showed a high sensitivity for detection of Citrate in a continuous range of 1.0 μM–500 μM. The CQDs showed good level of selectivity, repeatability, and stability for the detection of Citrate. We successfully detected the Citrate content for prostate cancer cells using an L-cysteine passivated carbon quantum dots various incubation durations. As a result, quenching in fluorescence intensity CQDs are noted to analyze extent of cancer cells in biological samples.

Abstract: The leveling power of gluconate and citrate electrolytes used to obtain the Co-W and Fe-W alloys was studied. The leveling power parameter P was calculated according to the results of profilographic measurements of microprofile carried out before and after deposition of the coating on surface. It was shown that deposition of said alloys occurs with preferential coating thickness increase on microprofile peaks and low microlevelling power.

Abstract: To calrify the combined effect of soft template and biominormolecule on the formation of hydroxyapatite (HAp), the study on the growth of HAp regulated by citrate and(or) hexadecyltrimethylammonium bromide (CTAB) solution was developed in a thermal aqueous. The as-obtained products were characterized by XRD, FT-IR and TEM, altogether with HRTEM and ED. Plate-like HAp crystals in nanosize with relative weak crystallinity were obtained in the presence of citrate. Nano-needle shape HAp crystals were produced in the presence of CTAB. Rod-like HAp crystals in a uniform nanosize were formed under the regulation of CTAB and citrate, which showed the same orientation as that of CTAB only. However, the possible mechanism of the growth of HAp was discussed in detail. CTAB micelles worked as a soft template modified by citrate, which guided to form HAp crystals in different morphology. The study is benefit to control the formation of HAp for its bioapplication.

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: In the presence of stabilizer of citrate and 10 nm gold nanoparticles (AuNPs) at 90 °C temperature, stable Au_coreAg_shell nanosol was prepared by reduction of AgNO₃ by citrate. It was characterized by UV-visible spectroscopy, resonance Rayleigh scattering (RRS) spectroscopy, and transmission electron microscopy. Results showed that the nanosol exhibited a RRS and surface Plasmon resonance (SPR) effect and the particle size is 20 nm.

Abstract: Properties of Au nanoparticles (NPs) caused by various sizes (5-12 nm) were studied in this article. Au NPs capped with citrate of various sizes were synthesized by two methods including trisodium citrate dihydrate reduction of chloroauric acid tetrahydrate and sodium borohydride reducion of chloroauric acid tetrahydrate. Au NPs were characterized and measured by using transmission electron microscope (TEM), UV-vis-NIR absorption spectroscopy, and surface Raman scattering. The results of experiment indicated that the size of Au NPs was related to the type of reducing agent and molar ratio of reducing agent and chloroauric acid. The weaker the reducing capacity of the reducing agent or the lower the molar ratio, the bigger the size of Au NPs is. The max wavelength of absorption peak for the citrate-capped Au NPs is red-shifted with the increase of particle diameter. Raman scattering observed from Au NPs of various sizes is found to be NP size-dependent. It is clear that the bigger Au NPs are more apparent in the Raman scattering determination. Size-tunable Au NPs should be crucial for biosensors, particularly as Raman-tag particles.

Abstract: Zinc selenide (ZnSe) quantum dot thin films have been deposited onto microscope glass through chemical bath deposition both from original amonia free alkaline precursors and modified precursors with the adding of sodium citrate as complexing agents. The growth and optical properties of samples from original and modified precursors have been investigated. Its shown that the samples obtained with sodium citrate precursors are uniform and with stable index of refraction. And with the adding of sodium citrate, there is an increase in transmittance.

Abstract: The N-doped Cu11O2 (VO4)6 photocatalyst was prepared using the sol-gel method. Techniques of X-ray diffraction (XRD), scanning electron microscope (SEM) have been employed to characterize the as-synthesized materials. During liquid phase photocatalytic degradation of Methy lorange(MO) under the UV-light, the as-prepared N-doped Cu11O2 (VO4)6 exhibits higher activity than the pure Cu11O2 (VO4)6 without doped N. It found that the N-doped Cu11O2 (VO4)6 prepared with the molar ratio of citric acid to metal inons be 2:1, N/Cu molar ratio of 12%, pH=7 and calcinated under 500°C for 4 hours was pure triclinic phase. In this conditions, the sample had highest photocatalytic activity with the photodegradation rate was about 94.42% or so in 60min under 20W ultraviolet lamp.

Abstract: Nd-doped Cu11O2 (VO4)6 photocatalyst was synthesized by complexing Sol-gel method and characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and energy Dispersive X-Ray Spectroscopy(EDX). The photocatalytic activity of Nd-doped Cu11O2 (VO4)6 was evaluated by photocatalytic degradation of methyl orange (MO) solution under UV-light. It revealed that the Nd-doped Cu11O2 (VO4)6 prepared with the molar ratio of citric acid to metal inons be 2:1, Nd/Cu molar ratio of 2%, pH=7 and calcinated under 500°C for 4 hours was pure triclinic phase. In this conditions, the sample had highest photocatalytic activity with the photodegradation rate was about 95.73% or so in 60min under 20W ultraviolet lamp.

Abstract: A La-doped Cu₁₁O₂ (VO₄)₆ photocatalyst with optimum La/Cu molar ratio of 4% was prepared by sol-gel method. XRD,SEM and EDX have been employed to characterize the as-synthesized materials. During liquid phase photocatalytic degradation of MO under the UV-light, the as-prepared La/ Cu₁₁O₂ (VO₄)₆ exhibits higher activity than the pure Cu₁₁O₂ (VO₄)₆. It found that the La/ Cu₁₁O₂ (VO₄)₆ prepared with the La/Cu molar ratio of 4% and calcinated under 500°C for 4 hours was pure triclinic phase. In this conditions, the sample had highest photocatalytic activity with the photodegradation rate was about 92.45% or so in 60min under 20W UV light.