国产高颜值极品在线视频|中文字幕韩日精品|久久播这里有免费视播|国产白丝在线精品免费-日韩素人超碰,亚洲高清无码2020,国产精品国产三级国产AⅤ原创,日韩理论在线不卡

產(chǎn)品列表PRODUCTS LIST

首頁>產(chǎn)品中心>氣相色譜柱>SUPELCO氣相色譜柱>Astec CHIRALDEX A-DASUPELCO Astec CHIRALDEX A-DA手性氣相色譜柱 毛細(xì)管柱
SUPELCO Astec CHIRALDEX A-DA手性氣相色譜柱 毛細(xì)管柱

簡要描述：

SUPELCO Astec CHIRALDEX A-DA手性氣相色譜柱 毛細(xì)管柱
Supelco（色譜科）位于美國賓夕法尼亞州，是Sigma-Aldrich集團(tuán)下屬的子品牌，Supelco一直通過提供更新的，更可靠的色譜產(chǎn)品和來幫助色譜工作者來解決問題，其涉及的領(lǐng)域和行業(yè)有環(huán)境、食品、飲料、政府、醫(yī)藥、化工等

發(fā)郵件給我們：alab17@163.com

分享到： 1
在線留言

SUPELCO Astec CHIRALDEX A-DA手性氣相色譜柱 毛細(xì)管柱
 

  • CD Type: α (alpha)
  • Derivative: Dialkyl
  • Temp. Limits: -10 °C to 200 °C (isothermal) or 220 °C (programmed)

    Incorporates a phase consisting of a 2,6-di-O-pentyl-3-methoxy derivative of α-cyclodextrin. This phase is good for separations of heterocyclic amines. It has different selectivity from other phases and often shows reversal in elution from the PH phases.

    The dipentylated derivatives of alpha, beta and gamma cyclodextrin show pronounced selectivity differences based on the size, shape and functionality of the analyte. Strong evidence exists for inclusion complexation which is the basic driving mechanism and, therefore, resolution is affected by sample load. The beta-cyclodextrin form has the broadest applicability. Sample volumes under 1 microliter at concentrations of 5 mg/mL are typical with the 100/1 split ratio.

Features: 

  • Hydrophobic surface
  • Pronounced selectivity differences based on analyte size, shape and functionality
  • Separates heterocyclic amines
  • Different selectivity from other cyclodextrin derivatives
  • Often shows reversal in elution order from PH series

Selectivity priorities:

  • Alpha…Simple epoxides, cyclic ethers, linear substituted alkanes
  • Beta…Heterocyclic amines
  • Gamma…Naphthyl analogs

Mechanism Observations:

  • Stronger inclusion for DA and, therefore, size selectivity is important.
  • Critical temperature dependence for enantioselectivity. Above this temperature no separation occurs.

 

SUPELCO Astec CHIRALDEX A-DA手性氣相色譜柱 毛細(xì)管柱 訂貨信息：

Product #Description
72003ASTAstec CHIRALDEX A-DA 毛細(xì)管氣相色譜柱 L × I.D. 30 m × 0.25 mm, df 0.12 μm