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libingbeth

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[ÇóÖú] Hypersep C18Öù×ÓµÄǰ´¦ÀíÎÊÌâ ÒÑÓÐ3È˲ÎÓë

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Rhizosphere samples (approximately 3 g RFW) were ultrasonically extracted in 30 ml of 9:1 acetonitrile:water containing 0.1%
trifluoroacetic acid. After 10 min of ultrasonic agitation, extracts
were 11mm filtered (Qualitative Paper Grade 1, Whatman, UK),
evaporated with dry nitrogen, redissolved in 3 ml of methanol, and
0.2mm filtered (Millex-GN, Millipore, USA). SPE packings with
different pore sizes and bonded silica or polymeric particles were
evaluated. Because of the hydrophilic¨Chydrophobic nature of the
analytes, the SPE columns worked best when chosen to maximize
retention of impurities. Using SPE columns of octadecyl unendcapped bonded silica with an average pore size of 60 Å (HypoSep
C18, Thermo-Electron, USA), both surfactin and iturin A were eluted
with methanol, then evaporated dry, redissolved in 0.5 ml of methanol, and refiltered (0.2mm) for subsequent HPLC injection
and analyses.
ÎÒÏÖÔÚÒѾ­×öµ½Á˰ÑÑùÆ·ÈÜÓÚ3mlµÄ¼×´¼ÖС£È»ºóÂòÁËHyposep C18µÄÖù×Ó£¬µ«ÊDz»Ã÷°×Õâ¸ö·½·¨Àï˵µÄ¡°The SPEcolumns works best when chosen to maximize retention of impurities¡± ÊÇʲôÒâ˼¡£ÎÒÏÖÔÚÓ¦¸ÃÔõôǰ´¦ÀíÖù×ÓÄØ£¬ÑùÆ·±¾À´¾ÍÈܽâÔÚ¼×´¼ÖУ¬»¹Ëµ´ÓSPEÖù×ÓÉÏÃæÓü״¼Ï´ÍÑ£¬Çó¸ßÊÖʾÏ¡£
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sepax-Dr.G

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2Â¥2014-06-24 10:41:12
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libingbeth

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2Â¥: Originally posted by sepax-Dr.G at 2014-06-24 10:41:12
ÄãÒªÁ˽âÇå³þSPEµÄÔ­Àí¾ÍÖªµÀÁË£¬ºÍÉ«Æ×ÖùµÄÔ­ÀíÊÇÏàͬµÄ£¬Ê×ÏÈÄãÓÃÕýѹ»õ¸ºÑ¹°ÑÒºÌå¹ýÀ´Öù×Ó£¬ÒòΪÎü¸½×÷ÓñØÈ»»áÁôÓÐÎïÖÊÔÚСÖù×ÓÉÏ£¬ÒªÑ¡Ôñ²»Í¬µÄÁÜÏ´¼Á°ÑÎïÖÊÏ´ÍÑÏÂÈ¥´ïµ½·ÖÀëµÄЧ¹û

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3Â¥2014-06-24 10:55:23
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libingbeth

гæ (СÓÐÃûÆø)

ÒýÓûØÌû:
2Â¥: Originally posted by sepax-Dr.G at 2014-06-24 10:41:12
ÄãÒªÁ˽âÇå³þSPEµÄÔ­Àí¾ÍÖªµÀÁË£¬ºÍÉ«Æ×ÖùµÄÔ­ÀíÊÇÏàͬµÄ£¬Ê×ÏÈÄãÓÃÕýѹ»õ¸ºÑ¹°ÑÒºÌå¹ýÀ´Öù×Ó£¬ÒòΪÎü¸½×÷ÓñØÈ»»áÁôÓÐÎïÖÊÔÚСÖù×ÓÉÏ£¬ÒªÑ¡Ôñ²»Í¬µÄÁÜÏ´¼Á°ÑÎïÖÊÏ´ÍÑÏÂÈ¥´ïµ½·ÖÀëµÄЧ¹û

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4Â¥2014-06-24 10:57:03
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The SPEcolumns works best when chosen to maximize retention of impuritiesÕâ¾ä»°µÄÒâ˼¾ÍÊǵ±ÔÓÖÊÔÚspeСÖùÉϱ£Áô×î´óʱ£¨µ±È»ÊÇÑ¡Ôñ×îºÃµÄÌõ¼þ£©£¬spe¹¤×÷ЧÂÊ×îºÃ£¿
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5Â¥2014-06-26 09:20:06
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6Â¥2014-06-26 13:58:16
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