"Tus Kws Tshaj Lij Tshem Xim thiab Tshem Tsw Qab" hauv Kev Lag Luam Qab ZibⅠ
Hauv kev lag luam khoom noj thiab dej haus, kev lag luam qab zib yog ib qho tseem ceeb uas siv cov pa roj carbon activated. Thaum lub sijhawm tsim cov suab thaj xws li suab thaj qab zib, suab thaj beet, suab thaj hmoov, maltose, lactose, molasses, xylose, xylitol, glucose, thiab cov kua protein hydrolyzed, cov pa roj carbon activated ua lub luag haujlwm tseem ceeb hauv kev tshem tawm xim thiab tshem tawm ntxhiab.
Cov chaw tsim suab thaj muab faib ua cov chaw tsim suab thaj qab zib thiab cov chaw tsim suab thaj beet. Cov kua qab zib muaj ntau yam xim xws li melanoidins, caramel, thiab iron-polyphenol complexes. Cov pa roj carbon activated, uas muaj thaj chaw loj heev (500 - 1500m²/g) thiab muaj cov qauv nplua nuj ntawm mesopores thiab micropores, tuaj yeem ua rau muaj kev nqus tau zoo thiab ua haujlwm tshem xim zoo thaum siv cov kua qab zib no.
Muaj ntau lub micropores hauv cov khoom siv carbon activated, thiab qhov loj ntawm qhov pore yog dav heev, txij li ob peb angstroms mus rau ntau micrometers. Tshwj xeeb, muaj ntau lub micropores nrog qhov loj ntawm qhov pore hauv ntau ntawm ob peb mus rau kaum ntawm angstroms. Txhua lub micropores no sib raug rau ib qho chaw nto, ua rau tag nrho thaj chaw nto ntawm cov pa roj carbon activated zoo kawg nkaus. Rau 1 gram ntawm cov pa roj carbon activated nrog kev ua haujlwm zoo heev, nws thaj chaw nto tshwj xeeb tuaj yeem ncav cuag li 1000m². Vim tias lub zog atomic ntawm qhov chaw ntawm cov pa roj carbon activated yog nyob rau hauv lub xeev unsaturated thiab muaj cov rog valence seem, raws li thaj chaw nto loj tshwj xeeb, nws lub zog nto yog qhov tseem ceeb heev. Nws yog qhov tseeb vim yog qhov cuam tshuam adsorption uas lub zog tsis saturated ntawm qhov chaw ntawm cov pa roj carbon activated tuaj yeem them rau qee qhov, yog li txo cov zog nto. Yog li ntawd, nyob rau hauv qhov kub thiab txias tshwj xeeb thiab cov xwm txheej siab, qhov chaw ntawm cov pa roj carbon activated yuav nqus cov tshuaj uas tuaj yeem txo nws lub zog nto. Txawm li cas los xij, thaum cov pa roj carbon activated nqus cov tshuaj sib txawv ntawm cov tshuaj, qhov ntau ntawm kev nqus tsis sib xws nrog qhov sib piv ntawm cov tshuaj no hauv cov tshuaj. Cov pa roj carbon activated ib txwm ua rau cov solute concentration ntawm qhov chaw nqus ntau dua. Ua li no, txawm tias thaum lub peev xwm nqus tau zoo ib yam, cov tshuaj tsis yog qab zib nrog qhov concentration qis dua hauv cov tshuaj qab zib yuav raug nqus los ntawm cov pa roj carbon activated piv rau sucrose nrog qhov concentration siab dua. Cov tshuaj muaj xim hauv cov kua txiv hmab txiv ntoo feem ntau muaj qhov ntim molecular loj thiab qhov hnyav molecular loj. Los ntawm kev nqus ntawm cov pa roj carbon activated, nws lub zog ntawm qhov chaw raug txo qis rau ntau yam, thiab cov kua txiv hmab txiv ntoo kho nrog cov pa roj carbon activated tuaj yeem ua tiav qib tseem ceeb ntawm kev tshem tawm xim. Nws yog qhov tseeb vim tias cov pa roj carbon activated muaj qhov zoo heev decolorization thiab purification peev xwm rau cov kua txiv hmab txiv ntoo uas nws tau siv dav thiab zoo hauv kev lag luam qab zib siab heev txawv teb chaws.
Thaum siv cov pa roj carbon activated los kho cov kua qab zib, ntxiv rau nws cov txiaj ntsig zoo ntawm kev tshem tawm xim, nws kuj tseem tuaj yeem tshem tawm cov colloids thiab cov khoom tsis huv ntawm cov kua qab zib. Cov txheej txheem no yuav ua rau kom muaj qhov nro ntawm cov kua qab zib, txo nws cov viscosity, txo cov npuas dej thaum lub sijhawm ua kom qhuav, ua rau kom ceev ntawm kev siv crystallization, thiab tuaj yeem ua kom zoo dua cov txheej txheem crystallization qab zib, txhawb kev sib cais ntawm cov suab thaj los ntawm cov suab thaj.
Peb yog cov neeg muag khoom tseem ceeb hauv Suav teb, rau tus nqi lossis ntau cov ntaub ntawv txais tos hu rau peb ntawm:
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