Lactic Acid Precipitation
Lactic Acid Precipitation - Related Videos
03:24
Revival and Growth of Lactic Acid Bacteria
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2025
Source: Ayivi, R. et al., The Cultivation, Growth, and Viability of Lactic Acid Bacteria: A Quality Control Perspective. J. Vis. Exp. (2022)This video demonstrates the method for recovering cold-stressed lactic acid bacteria from a frozen glycerol stock, restoring bacterial viability through anaerobic incubation, and isolating active colonies for culture expansion.
11:28
High-Throughput Screening of L-Lactic Acid-Hyperproducing Bacillus coagulans Mutants Using an Automated Droplet Microfluidic Platform
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2026
This protocol presents a standard high-throughput screening workflow for industrial microorganisms. It involves constructing a mutant library via ARTP mutagenesis, performing positive droplet screening with automated microfluidics, and subsequently verifying the results. The workflow’s reliability was validated by screening high-yield B. coagulans strains.
03:11
Precipitation of Ions
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2020
Predicting Precipitation The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is: It is important to realize that this equilibrium is established in any aqueous solution containing Ca2+ and CO32– ions, not just in a solution formed by saturating water with calcium carbonate. Consider, for example, mixing aqueous solutions of the soluble compounds sodium carbonate and calcium nitrate. If the concentrations of calcium and carbonate ions in the mixture...
08:02
Separation of Mixtures via Precipitation
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2023
Source: Laboratory of Dr. Ana J. García-Sáez — University of Tübingen Most samples of interest are mixtures of many different components. Sample preparation, a key step in the analytical process, removes interferences that may affect the analysis. As such, developing separation techniques is an important endeavor not just in academia, but also in industry. One way to separate mixtures is to use their solubility properties. In this short paper, we will deal with aqueous solutions. The...
01:17
Precipitation and Co-precipitation
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2024
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
FAQs
Lowering pH changes the electrical charge carried by molecules in the sample. That charge shift can weaken their interactions with the surrounding solvent and make them less soluble. As solubility decreases, molecules may aggregate into larger assemblies that form an insoluble precipitate. This chemical transition determines which components can be separated from the mixture.
Lactic acid concentration, temperature, exposure time, and the target molecule’s inherent solubility all affect the outcome. Changing concentration alters the extent of pH reduction, while temperature and contact time influence how fully aggregation develops. Because different molecules respond differently, researchers must control these variables when aiming for consistent removal or recovery.
The method works only when the selected molecule becomes sufficiently insoluble under the treatment conditions. Molecules with different solubility properties may therefore precipitate to different extents in the same sample. This property provides the basis for separating selected components from complex biological mixtures, but it also means that conditions must be matched to the intended target.
Once an insoluble precipitate forms, it can be separated from the remaining liquid by centrifugation or filtration. Centrifugation collects the material as a concentrated fraction, whereas filtration retains insoluble material on a filter. The appropriate collection route depends on the sample and the desired downstream workflow, including isolation, cleanup, or analysis.
A basic workflow requires introducing lactic acid to the sample, controlling the concentration, temperature, and exposure time, and then allowing the selected components to become insoluble. The resulting mixture is subjected to centrifugation or filtration to collect the precipitate. Careful control at each stage supports reproducible sample preparation and separation.
In medical and biomedical settings, the approach can support protein isolation, cleanup of biological samples, and analytical workflows. Its value is greatest when a complex mixture contains components that respond differently to reduced pH and solubility changes. By removing or recovering selected material before analysis, it can help prepare samples for subsequent laboratory procedures.