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Crystallization characterization of L

流动电位法对L



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ChineseJournalofBioprocessEngineering
Vol.8No.1
Jan.2010
doi:10.3969/j.issn.1672-3678.2010.01.010
OPQI
:2009-05-15
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CrystalizationcharacterizationofLTrpwithstreaming
potentialmeasurement
WANGJian1,XUXingyou2,3,MAWeixing1,LIUWeiwei1,LULude2,YANGXujie2,WANGXin2
(1.ColegeofChemicalEngineering,HuaihaiInstituteofTechnology,Lianyungang222005,China;
2.SchoolofChemicalEngineering,NanjingUniversityofScienceandTechnology,Nanjing210094,China;
3.HuaiyinInstituteofTechnology,Huaan223003,China)
Abstract:ThestreamingpotentialofsaturatedsolutionofLTrpwasdeterminedtocharacterizeitscrystal
lizationintemperatureloweringprocess.Theinfluenceofsolutionacidityandtheinitialtemperatureto
thevtcurvewasinvestigated.TheresultsshowedthattheLTrpsolutionhadmorecompetitivenucleating
abilityatlowerinitialtemperature(20℃),andlesscompetitivenucleatingabilityat25and35℃.Itis
showntotheυtcurveofthesameinitialtemperaturefornucleatingabilityhadbigdiferencewiththea
ciditychangeoftheLTrpsaturatedsolution.ThesolutionsofpH50andpH60hadlesscompetitive
nucleatingability.Thegrowthunitmodewasusedtoexplainthephenomena.
Keywords:crystalization;nucleating;streamingpotential;LTrp
  
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3ÂX‰‡W

Ds0óý
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€8

02ÀÈæ
,pKa1 =246,pKa2 =
941。
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pH
8
24~94
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。pH>94
Ú

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8
94<pH<100
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1 L
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Table1 ThesolubilityofLTrp
t/℃ 0 20 25 75 100
š2˜

[g·(100g
<
)-1] 0023 10 114 279 499
  
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Fig.1 Experimentalsetupofstreamingpotenial
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Fig.2 PhotographofLTrpcrystal
magnifiedbymicroscope
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L Trp
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solutionatstartingtemperature(20℃)
  
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141μV/Pa。
  
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pH=50
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3
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μV/PaÏá3+ÉҒ¢žŸDU。
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