Enantiomeric Purity
Enantiomeric Purity - Related Videos
12:17
Detection and Isolation of Apoptotic Bodies to High Purity
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Cited by 29 •
2018
A workflow using flow cytometry or differential centrifugation is developed to detect, quantify and isolate apoptotic bodies from an apoptotic sample to high purity.
12:06
Synthesis of High Purity Nonsymmetric Dialkylphosphinic Acid Extractants
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A protocol for the synthesis of high purity nonsymmetric dialkylphosphinic acid extractants is presented, taking (2,3-dimethylbutyl)(2,4,4'-trimethylpentyl)phosphinic acid as an example.
07:54
Rapid and Refined CD11b Magnetic Isolation of Primary Microglia with Enhanced Purity and Versatility
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Cited by 22 •
2017
Here, we present a protocol to isolate microglia from postnatal mouse pups (day 1) for in vitro experimentation. This improvised method of isolation generates both high yield and purity, a significant advantage over alternate methods that allows broad range experimentation for the purposes of elucidating microglial biology.
08:02
Determination of Immune Cell Identity and Purity Using Epigenetic-Based Quantitative PCR
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Cited by 1 •
2020
Here we describe a robust method of determining immune cell identity and purity through epigenetic signatures detected using quantitative PCR (qPCR). DNA demethylation at a specific locus serves as a unique identifier for a particular cell type and allows for identification of CD8+, regulatory, or Th17 T cells.
06:34
A Tailored HPLC Purification Protocol That Yields High-purity Amyloid Beta 42 and Amyloid Beta 40 Peptides, Capable of Oligomer Formation
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Cited by 6 •
2017
Herein we report a tailored HPLC purification protocol that yields high-purity amyloid beta 42 (Aβ42) and amyloid beta 40 (Aβ40) peptides, capable of oligomer formation. Amyloid beta is a highly aggregation prone, hydrophobic peptide implicated in Alzheimer's disease. The amyloidogenic nature of the peptide makes its purification a challenge.
FAQs
Enantiomers have identical properties in achiral environments, so conventional measurements may not readily separate their contributions. Their behavior becomes distinguishable when they interact with a chiral stationary phase or a chiral reagent. This difference provides the analytical basis for determining whether a sample is enriched in one mirror-image form and for assessing its suitability for chemical use.
Chiral chromatography uses a chiral stationary phase that interacts differently with each enantiomer. These unequal interactions allow the mirror-image forms to be separated and then quantified from the resulting analytical signals. The measured proportions show whether one enantiomer predominates and provide a direct way to evaluate stereochemical composition during chemical analysis.
Chiral reagents can create distinguishable interactions with enantiomers, while NMR can detect differences arising from those interactions. These approaches provide alternatives or complements to chiral chromatography for determining the relative amounts of mirror-image forms. Their shared value is converting otherwise difficult-to-observe stereochemical differences into measurable analytical information.
Enantiomeric excess expresses the difference between the proportions of the two enantiomers in a sample. A larger excess indicates stronger enrichment in one form, whereas a smaller excess indicates a composition closer to an even mixture. This value helps communicate stereochemical selectivity and provides a concise measure for comparing samples or chemical processes.
A typical workflow begins by selecting an approach that can distinguish the enantiomers, such as chiral chromatography or NMR using suitable chiral interactions. The analysis then determines the relative amount of each form and uses those proportions to assess stereochemical composition or enantiomeric excess. The resulting measurement supports decisions about chemical use, process performance, or sample quality.
Asymmetric synthesis aims to produce a preferred stereochemical form, so measuring enantiomeric purity shows how effectively that selectivity was achieved. In pharmaceutical development, different enantiomers can produce distinct biological effects, making stereochemical composition especially important. Quality-control measurements therefore help evaluate chemical materials and determine whether their enantiomeric composition is appropriate for the intended use.