Friday, May 31, 2013

Diazinon Pesticide Reference Standard | Greyhound Chromatography

Diazinon (IUPAC name: O,O-Diethyl O-[4-methyl-6-(propan-2-yl)pyrimidin-2-yl] phosphorothioate, INN - Dimpylate), a colorless to dark brown liquid, is a thiophosphoric acid ester developed in 1952 by Ciba-Geigy, a Swiss chemical company (later Novartis and then Syngenta). It is a nonsystemic organophosphate insecticide formerly used to control cockroaches, silverfish, ants, and fleas in residential, non-food buildings. Diazinon was heavily used during the 1970s and early 1980s for general-purpose gardening use and indoor pest control. A bait form was used to control scavenger wasps in the western U.S. Diazinon is used in flea collars for domestic pets in Australia. Residential uses of diazinon were outlawed in the U.S. in 2004 but it is still approved for agricultural uses. An emergency antidote is atropine.

Also known as: Diazinon; O.O-Diethyl-O-[2-isopropyl-4-methyl-6-pyrimidyl]phosphorothioate; Sarolex®; Basudin®; Neocidol; Alfa-Tox®; Spectacide®; Nucidol®; PS-90; F2060

Buy Now:  Part no: N-11621-250MG

Thursday, May 30, 2013

Chiral HPLC Columns from TCI | Carbonyls, Ketones, Esters,Carboxylic acids,Amino Acid Derivatives,Alcohols

A new type of chiral separation with synthetic organic polymer phase systems - TCI Chiral.

  1. A unique new stationary phase

Polymaleimide helical polymer bearing chiral side groups coated on silica gel

  • Suitable for separation of a wide range of compounds

Carbonyle (Ketones, Esters, Carboxylic acids, N- Protected amino acids). Alcohols and others.

  • Applicaable to both normal and reversed phase modes
  • High column load capacity
  • Superior column longevity - Maximum pressure 2900 psi (20 MPa)
  • High throughput analysis
  • Affordable Prices

Mobile Phase Protocol

TCI chiral columns can be used for both normal phase and reversed phase chromatography.  In most cases, reversed phase is rarely the first choice, normal phase is generally the best choice to start with.  Reversed phase is suitable for LC-MS applications or aqueous conditions.

<Normal Phase>

n-Hexane  /  2-Propanol = 90 / 10 (initial condition)

  • Elution time is long → Increase 2-Propanol ratio (ex.30%)
  • elution time is short → Decrease 2-Propanol ration (ex.1%)
  • Acidic compound → Add 0.1% of Trifluoroacetic Acid
  • Basic compound → Add 0.1% of Diethylamine

<Reversed Phase>

Acetonitrile / Water = 20 / 80 (initial condition)

  • Elution time is long → Increase Acetonitrile ratio (ex.40%)
  • Elution time is short → Decrease Acetonitrile ratio (ex.10%)
  • Acidic compound → Add 0.1% of Trifluoroacetic Acid
  • Basic Compound → Add buffer solution

TCI Chiral Columns

TCI Chiral MB-S

TCI Chiral BP-S

TCI Chrial CH-S

TCI products are supplied by Greyhound Chromatography and Allied Chemcials, 6 Kelvin Park, Birkenhead, Merseyside, CH41 1LT

Thursday, May 30, 2013

Summer Special Offers

View Greyhound's Summer Special Offers in our latest Newsletter.

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