Sodium Citrate Reduction
Sodium Citrate Reduction - Related Videos
02:10
Reduction of Alkynes to trans-Alkenes: Sodium in Liquid Ammonia
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2023
Alkynes can be reduced to trans-alkenes using sodium or lithium in liquid ammonia. The reaction, known as dissolving metal reduction, proceeds with an anti addition of hydrogen across the carbon–carbon triple bond to form the trans product. Since ammonia exists as a gas (bp = −33°C) at room temperature, the reaction is carried out at low temperatures using a mixture of dry ice (sublimes at −78°C) and acetone. When dissolved in liquid ammonia, an alkali metal, such as sodium, dissociates into a...
03:44
Citrate Synthase Activity Assay: A Colorimetric Assay to Measure Mitochondrial Citrate Synthase Activity in Drosophila Tissue Homogenate
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2025
This video describes a colorimetric assay to measure the mitochondrial citrate synthase activity assay present in the tissue homogenate of Drosophila.
03:11
Oxidation-Reduction Reactions
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2020
Oxidation–Reduction Reactions Earth’s atmosphere contains about 20% molecular oxygen, O2, a chemically reactive gas that plays an essential role in the metabolism of aerobic organisms and in many environmental processes that shape the world. The term oxidation was originally used to describe chemical reactions involving O2, but its meaning has evolved to refer to a broad and important reaction class known as oxidation–reduction (redox) reactions. Some redox reactions involve the transfer of...
01:26
Regulation of Sodium and Potassium
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2024
The regulation of sodium and potassium ion concentrations in the human body is a complex process governed primarily by hormones such as aldosterone, antidiuretic hormone (ADH), and atrial natriuretic peptide (ANP). Sodium Regulation Sodium ions make up approximately 90% of extracellular cations, with a normal blood plasma concentration of 136–148 mEq/L. A decrease in blood volume and pressure triggers the release of renin from granular cells in the juxtaglomerular complex (JGC), primarily in...
08:53
Synthesizing Sodium Tungstate and Sodium Molybdate Microcapsules via Bacterial Mineral Excretion
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2018
This work presents a protocol for manufacture sodium tungstate and sodium molybdate microcapsules via bacteria and their corresponding nanoparticles.
FAQs
Citrate has two functions in colloidal gold synthesis. It reduces dissolved gold ions to elemental gold and then adsorbs onto newly formed particle surfaces. That surface coverage helps limit aggregation, allowing particles to remain dispersed in the liquid. This stabilization is important because uncontrolled particle contact can alter growth and reduce control over the final colloid.
Particle size depends on the citrate-to-metal ratio, reactant concentration, temperature, and mixing conditions. These variables influence how quickly nucleation begins, how particles grow afterward, and how effectively the colloid remains stabilized. Engineering control of these conditions therefore provides a way to tune the final nanomaterial rather than treating particle size as fixed.
Nucleation creates the initial elemental metal particles, while subsequent growth determines how those particles develop into the final colloid. Sodium citrate reduction is sensitive to conditions that affect both stages, so changing reagent ratios, concentration, temperature, or mixing can change the resulting size. Considering the two stages together helps explain why small process changes alter the nanomaterial outcome.
A typical workflow uses an aqueous gold salt and sodium citrate under heated conditions. The reaction mixture is brought to boiling while citrate reduces the dissolved metal and adsorbs onto emerging particles. Concentration, citrate-to-metal ratio, temperature, and mixing must be controlled during processing because they influence nucleation, growth, aggregation, and the final colloidal material.
The resulting colloidal gold nanoparticles support several engineering applications, including optical sensing, catalysis, biomedical devices, and materials characterization. Their usefulness comes from the ability to produce a stabilized colloid with tunable particle size. Engineers can therefore select reaction conditions according to the needs of a sensing platform, catalytic material, device, or characterization study.
Evaluation should focus on the final particle size, colloidal stability, and consistency of the produced nanomaterial. These outcomes indicate whether the selected citrate ratio, concentration, temperature, and mixing conditions supported controlled nucleation and growth. In engineering studies, the resulting material can then be considered for optical sensing, catalysis, biomedical devices, or characterization.