chemical stability

 

    1.5- 9.5 pH ¹üÀ§¿¡¼­ ¾ÈÁ¤ÇÑ Kromasil Silica

    silica Ç¥¸éÀÇ Æ¯Â¡

    kromasil silicaÀÇ Ç¥¸éÀº »ê¼º silanols¸¦ ÃÖ¼ÒÈ­Çϰí, ´ÜÀÏÇüÀ¸·Î ºÐÆ÷µÈ Áß¼ºÀÇ silano groupÀ¸·Î
    ±¸¼ºµÇ¾î ÀÖ´Ù.

    ´Ü¹éÁú, ÆéŸÀÌµå ºÐ¼®¿¡¼­ Á¾Á¾ TFA¿Í °°Àº »ê¼º buffer³ª °­¿°±â Á¶°Ç¿¡¼­ ½ÇÇèÇÏ´Â °æ¿ì¿¡µµ ¼ö¸íÀÇ
    ´ÜÃàÀ̳ª »ùÇÃÀÇ ¼Õ»óÀ» °ÆÁ¤ÇÒ Çʿ䰡 ¾ø´Ù.


    Values of k' for butylbenzene plotted against the number of column volumes of purge.


    Regeneration of a Kromasil column contaminated with polymeric insulin, at pH>13. 

    È­ÇÐÀûÀÎ ¾ÈÁ¤¼ºÀ¸·Î ÀÎÇÏ¿©

    - ±ä ¼ö¸íÀ» º¸ÀåÇÑ´Ù.
    - retention timeÀÇ º¯È­°¡ ÀÛ´Ù.
    - ½Ç¸®Ä« ¸ÅÆ®¸¯½º³ª ¸®°£µå·ÎºÎÅÍÀÇ ´©Ãâ¿¡ÀÇÇÑ  °á°ú¹°ÀÇ ¿À¿°À» ÁÙÀÏ ¼ö ÀÖ´Ù.


    Table 1 Leakage of bonded phase and silica from Kromasil phases at pH>13.

    conditions:
    Carbon content: C4: 7.7% carbon(w/w), C8: 11.8% carbon(w/w)columns: 4.6 x 250 mm(new columns)
    Eluent: n-propanol: 0.1M NaOH(7:3v/v) Flow rate: 1.0ml/min.Total volume: 41.5 ml(=10 column volumes)
    Detection method: Atomic absorption(Si) Detection limit: 0.5 ppm


    Table 2 Leakage of bonded phase and silica from Kromasil C8 at two different mobile phase pH, 8 and 2.

    conditions, pH 8 :
    Coliumn: 4.6 x 250 mm (new column) ·
    Mobile phase 1 : n-propanol : buffer (10 : 90) · Mobile phase 2 : n-propanol : buffer (70 : 30)
    Buffer : NH4Ac(0.2M)/NH3, pH=8.0 · Flow rate: 0.5ml/min.
    Total volume: 1,315ml(317 column volumes)
    Detection method: Atomic abs.(Si) · Detection limit: 0.5 ppm
    conditions, pH 2 :
    Coliumn: 4.6 x 250 mm (new column) ·
    Mobile phase 1: n-propanol : H2O(10 : 90 : 0.1) · Mobile phase 2: n-propanol : H2O(70 : 30 : 0.1)
    Flow rate: 0.5ml/min.· Total volume : 1,315 ml (317 column volumes) · Detection method: Atomic abs.(Si) · Detection limit: 0.5 ppm