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    Search term:"gas_chromatography"

    580 matches found for gas_chromatography

    Certified Reference Materials: Synthesis and Characterization of Cocaine N-oxide HCl

    Cocaine is one of the most widespread illicit drugs of abuse in the US. Cocaine N-oxide is a metabolite of cocaine formed by cytochrome P-450 mediated oxidation of cocaine.1,2 Cocaine N-oxide has been reported to be found in human plasma of cocaine users as well as meconium.1 Cocaine N-oxide isomers...

    Synthesis and Characterization of threo Ritalinic Acid D10 Hydrochloride

    As a major metabolite of methylphenidate (1, Ritalin), ±-threo-Ritalinic acid (2) is of clinical relevance. To this end ±-threo-ritalinic acid-D10 HCl (3) was synthesized in seven steps with a purity of 99% and an isotopic purity ratio of D0/D10 = 0% and a significant amount of the D9-D7 isomers. Be...

    Trap Selection, Fast GC, and Troubleshooting Strategy for Purge & Trap GC Volatiles Video

    Purge & trap (P&T) in combination with gas chromatography (GC) is a widely used analytical technique for the analyses of volatiles, particularly in the environmental laboratory industry. This presentation will provide: • a basic understanding of adsorbents and traps • show how to select the proper t...

    High-Throughput Kits for Cholesterol and Fatty Acid Extractions

    Our Fatty Acid Extraction Kit and Cholesterol Extraction Kit offer a patent-pending, chemically-modified filter that enables the isolation of compounds such as lipids (including fatty acids) and sterols (including cholesterol). Our new kit method is simpler, faster, more accurate and less costly tha...

    Culturing Trophoblast (TS) Cell Lines Protocol

    Sigma® has prepared product lists for commonly used protocols from Cold Spring Harbor Protocols. View the entire protocol on BioSupplyNet.com. View the entire protocol "Culturing Trophoblast Stem (TS) Cell Lines" at BioSupplynet.com Janet Rossant This protocol was adapted from "Isolation and Culture...

    Bio Brief: Pristane [VIDEO]

    Sigma has developed a synthetic alternative to shark-derived pristane. Originally, pristane was isolated from the basking shark. When the basking shark became endangered, Sigma began offering a unique, synthetic pristane for research applications. Pristane is used to induce inflammatory diseases, su...

    Agro, Food and Beverage

    We are offering a wide range of solvents for the Food and Beverage, covering qualitative and quantitative food safety analysis, composition/nutritional testing and food production. An overview on all products and services for the agro, food and beverage market can be found on the Food & Beverage mai...

    ±threo-Ritalinic acid-D10 Hydrochloride an internal standard for quantitation of Ritalinic acid by LCMSMS: Synthesis determination of isotopic distribution by qNMR and LCMS

    As a major metabolite of methylphenidate (1, Ritalin), ±-threo-Ritalinic acid2 is of clinical relevance. To this end ±-threo-ritalinic acid-D10HCl3 was synthesized in seven steps with a purity of 99% and an isotopic purity ratio of D0/D10= 0% and a significant amount of the D9-D7 isomers. Because pr...

    Analysis of Pesticides in Baby Food by Solid Phase Microextraction (SPME) Using a New Overcoated Fiber

    Related Products • Food & Beverage Analysis • Pesticide Analysis • Supelclean™ Ultra SPE Related Articles • Reporter US Volume 34.3 • Analysis of Pesticides in Turmeric Powder by LC/MS/MS • Extraction of Permethrin Pesticides from Spinach Using QuEChERS Methodology with Automated Shaking • Extractio...

    How Technology is Impacting Our Sensory Experiences

    Interested in receiving more content like this? Join over 2,500 of your peers who have already signed up for the bi-monthly Flavors and Fragrances newsletter. The art of flavor and fragrance formulation has stayed true over the years, but technology has not stood still. Consumers’ ever-evolving tast...

    Supelco QuEChERS Dispersive SPE

    Introduction to Supel QuE Z-Sep NEW Supel™QuE Brochure - Multi-Residue Pesticide Analysis in Food and Agricultural Products Using the QuEChERS Method NEW Supel™ QuE Verde for Challenging Compounds in Green Matrices Supel™ QuE Z-Sep for Fat Removal in Difficult Matrices View the Ordering Information ...

    SupelMIP® Literature & References

    Title Molecularly Imprinted Polymer Overview SupelMIP SPE Brochure (981 Kb PDF) The Selective Extraction of Chloramphenicol using Molecularly Imprinted Polymer SPE, Shimelis O, Trinh A, Brandes H, US Supelco Reporter, 25.1 (482 Kb PDF) Analysis of analytes - The use of MIPs in solid-phase extraction...

    ‘Positive List’ Chemicals by GC-MS on the SLB-5ms

    Related Articles • Dual-Column GC Analysis of Organochlorine Pesticides on SLB-5ms and SLB-35ms Katherine K. Stenerson, Takeyoshi Ide1, and Michael D. Buchanan mike.buchanan@sial.com 1. Sigma-Aldrich, Tokyo, Japan In May of 2006, the Japan Ministry of Health, Labour and Welfare (MHLW) introduced reg...

    GC Analyses of Free Fatty Acids

    Related Articles • Chiral GC Analysis of Carvone Enantiomers in Essential Oils • • Download PDF • One area of current public interest is nutrition, specifically, the fat content of food. Obesity, diabetes, and cardiovascular disease, along with their related complications, are increasing in America,...

    Cannabinoid Standards

    Cannabinoids are a class of psychoactive substances that are among the most widely abused and readily available drugs in the world.1,2 These drugs can produce intense psychological and physiological effects including auditory and visual hallucinations, anxiety, and euphoria. Besides persistent illic...

    Trypsin

    Related Links • Trypsin Inhibitors • Cell Dissociation with Trypsin • Physical Properties and In Vivo Processing • Specificity, Kinetics, Substrates and Assay Methods • Inhibitors • Reconstitution and Solution Stability • Applications and Protocols • Products • References Trypsin Enzyme Commission (...

    Dry Powder Media Global Supply

    SAFC Overview Why Choose SAFC? Media Supply Strategy DPM Manufacturing Capability and Capacity Packaging and Logistics Global Quality Systems Raw Materials Scale-up & Support Services Small Volume Custom Media – imMEDIAte Advantage™ Erythropoietin Hormone (Molecular model) Erythropoietin (EPO) is a ...

    Primers for Plasmid Sequencing

    We have designed a range of forward and reverse sequencing primers that allow you to sequence any insert that you make into a particular position within any of our SnapFast™ expression vectors. Other vectors will require that you design your own primers. Where possible, the binding sites for each of...

    radiello® Diffusive Air Sampling Application - Anaesthetic Gases and Vapours

    Related Products • radiello Diffusive Sampling products Related Information • Frequently Asked Questions radiello Table of Contents Sampling kit Product No. RAD125, containing 20 single packages each composed of: 1 permeative body (Product No. RAD1203) 1 supporting plate (Product No. RAD121) 1 verti...

    Gas Chromatography | Supelco GC Columns and Accessories

    Supelco's full-line of capillary gas chromatography (GC and GC-MS) columns includes ionic liquid, MS-grade, Fast GC, GCxGC, chiral, and PLOT columns, conveniently grouped by industry (including environmental, petroleum, food & beverage, and pharmaceutical), by method reference, by phase polarity and...

    Phenolic Calibration Standards

    Phenolic compounds are important raw materials for the manufacturing of phenolic resins, pharmaceuticals, laboratory reagents, dyes, germicidal paints, and general disinfectants. Due to their toxicity to both man and animals, manufacturers using these raw materials may be required by local or region...

    Glycine Hydrochloride for Cell Culture

    • • Download PDF • PharmaGrade, manufactured under appropriate controls for use as a raw material in pharma or biopharmaceutical production. Suitable for cell culture. • Product Regulatory Datasheet • Cherokee Buffers Quality Overview • Cherokee Buffers Site and Supply Chain Security Overview 1. Gen...

    Cross Coupling Reactions of Chiral Secondary Organoboronic Esters With Retention of Configuration-

    We describe a systematic study of the scope and relationship between ligand structure and activity for a highly efficient and selective class of catalysts containing sterically hindered chelating alkylphosphines for the amination of heteroaryl and aryl chlorides, bromides, and iodides. In the presen...

    Reversed-Phase SPE Methodology in Solid Phase Extraction

    Aqueous Sample Matrix/Mobile Phase Environment Basic Steps SPE Tips Aqueous Sample Matrix/Mobile Phase Environment Reversed-phase SPE is considered the least selective retention mechanism when compared to normalphase or ion-exchange SPE. In other words, it may be difficult for a reversed-phase metho...

    Determination of Headspace Volatiles in Distilled Spirits Using SPME Coupled to GC

    A beverage manufacturer may be interested in the overall composition of their product, or may need to determine the levels of alcohol, caffeine, nutraceuticals, antioxidants, vitamins, sweeteners, aroma, off-flavors, and/or impurities. Sample preparation of a beverage is often simple, and can usuall...

    Astec Cellulose DMP Chiral HPLC Columns, from Supelco

    Astec Products | Technical Resources | Bibliography Ordering Information Efficient, Rugged, and Economical Columns for Chiral HPLC & SFC Astec Cellulose DMP is a chiral stationary phase (CSP) comprising spherical, high-purity porous silica coated with DMPC (3,5-dimethylphenyl carbamate)-derivatized ...

    About Supelco

    For more than 40 years, we have been helping scientists around the world solve their chromatography problems by providing innovative, reliable products and expert technical support. We are committed to accelerating our customers' success through leadership in life science, high technology and servic...

    Large Molecule Workflow

    Bioanalysis of large molecules refers to a set of methods, assays and procedures that enable scientists to quantitatively measure specific proteins and peptides found in living organisms and biochemical reactions underlying life processes. Each large biomolecule presents challenges in characterizati...

    Solvents for Chemical Industry

    We provide the largest offerings of high-quality solvents to meet the needs of Oil Industry, Specialty Chemicals, and Medical Materials. For more information, please visit Industrial R&D chemical synthesis workflow. • Chemical Reactions • Reaction Analysis • Purification • Product Analysis • Custom ...

    GC Analysis of Glycols and Diols

    • • Download PDF • mike.buchanan@sial.com Glycol and diol compounds are used to solubilize active ingredients for use in many consumer products, including cosmetics, ballpoint pen inks, wood stains, and lacquers. They are also used as co-monomers in polymerization reactions to form polyesters and po...