Indlela Yokuhlukanisa Ingxube Ye-Chromatography
I-Pendahuluan
I-Chromatography ingenye yezindlela ezisebenza kahle kakhulu neziguquguqukayo zokuhlukanisa izingxube zamakhemikhali, ezisetshenziswa emikhakheni ehlukahlukene yesayensi kanye nemboni. Igama elithi "chromatography" livela emagameni esiGreki athi "chroma," okusho umbala, kanye nelithi "graphein," okusho ukubhala. Nakuba le ndlela yayisetshenziswa ekuqaleni ukuhlukanisa ama-compound anemibala, namuhla i-chromatography ingasetshenziswa ukuhlukanisa, ukuhlonza, nokuhlaziya izinhlobo eziningi zezinto, ezinombala nezingenambala.
Izimiso Eziyisisekelo ze-Chromatography
Empeleni, i-chromatography ihilela izigaba ezimbili: isigaba esingaguquki kanye nesigaba esihambayo. Isigaba esingaguquki siyinto ehlala ingaguquki futhi inamathela kukholomu noma ebusweni, kuyilapho isigaba esihambayo siwuketshezi noma igesi egeleza esigabeni esingaguquki. Izinto ezikusampula zihlukaniswa ngokusekelwe ekwehlukeni kwamazinga azo okufuduka phakathi kwalezi zigaba ezimbili.
Indlela ye-Chromatography
1. I-Paper Chromatography
I-paper chromatography ingenye yezindlela ezilula eziyisisekelo. Kule ndlela, iphepha lisebenza njengesigaba esimile, kanti isixazululo (ngokuvamile amanzi noma ingxube yezinto eziphilayo) sisebenza njengesigaba esihambayo. Isampula ibekwa ngemuva kwephepha, bese iphepha licwiliswa ku-solvent. I-solvent igeleza ephepheni, ithwala izinto zengxube nazo ngamazinga ahlukene, ngokusekelwe ekuhlobaneni kwazo kwezigaba ezimile nezihambayo. Lena yindlela elula nephumelelayo yokuhlukanisa izinto ezine-polarities ezahlukene.
2. I-Chromatography Yezingqimba Ezincane (i-TLC)
I-TLC ingenye indlela elula nesheshayo. Isebenzisa ipuleti lengilazi, lensimbi, noma lepulasitiki elimbozwe ungqimba oluncane lwe-adsorbent njenge-silica gel noma i-alumina njengesigaba esingaguquki. Isampula ifakwa esisekelweni sepuleti, bese ipuleti lifakwa esitsheni esiqukethe ungqimba olungajulile lwe-solvent (isigaba esihambayo). I-solvent ikhuphuka ngepuleti ngesenzo se-capillary, ithwala futhi ihlukanise izingxenye zesampula. Imiphumela yokuhlukanisa ingabonakala ngqo ngaphansi kokukhanya kwe-UV noma ngokuphendula ngama-reagents akhethekile.
3. I-Chromatography Yamakholomu
I-chromatography yamakholomu ihilela ukusetshenziswa kwekholomu eqondile egcwele isigaba esingaguquki, njenge-silica gel noma i-alumina. Isigaba esihambayo, esingaba yisisombululo se-organic noma ingxube yezinyibilikisi, sidlula kukholomu egcwele isampula. Izinto ezisesampula zihlukaniswa ngokusekelwe ekuthandeni kwazo kwesigaba esingaguquki kanye nokuhambahamba esigabeni esihambayo. I-chromatography yamakholomu inezinhlobo eziningi, njenge-chromatography yoketshezi olunomfutho ophezulu (i-HPLC) kanye ne-flash liquid chromatography.
4. I-Gas Chromatography (I-Gas Chromatography – GC)
I-GC isetshenziselwa ukuhlukanisa nokuhlaziya ama-volatile compounds. Kule ndlela, isigaba esimile ngokuvamile siwuketshezi olumbozwe ku-solid engasebenzi futhi sibekwe kukholomu ye-capillary, kuyilapho isigaba esihambayo siyigesi efana ne-helium noma i-nitrogen. Isampula ifakwa kukholomu, lapho ama-compounds ephenduka khona umhwamuko futhi athwalwa yigesi engasebenzi. Ukwehlukana kwenzeka ngaphakathi kwekholomu ngokusekelwe ekwehlukeni kokungaguquguquki kanye nokusebenzisana kwama-compounds nesigaba esimile. I-detector ekugcineni kwekholomu ilinganisa inani le-compound ngayinye ekhishwe, okuvumela kokubili ukuhlaziywa kwenani kanye nokwekhwalithi.
5. I-Chromatography Yoketshezi Esebenza Kakhulu (i-HPLC)
I-HPLC inguqulo ethuthukisiwe ye-chromatography yamakholomu esebenzisa umfutho ophezulu ukupompa isigaba esihambayo kukholomu egcwele izinhlayiya ezincane njengesigaba esimile. Le ndlela inikeza isisombululo esingcono futhi ivumela ukuhlaziywa okusheshayo nokusebenza kahle kwezinhlobo eziningi zamakhemikhali. Ama-detector ahlukahlukene angasetshenziswa ku-HPLC, kufaka phakathi i-UV-Vis, i-fluorescence, kanye ne-mass spectrometry, okuvumela uhla olubanzi lwezicelo ekuhlaziyweni kwamakhemikhali, kwezinto eziphilayo, kanye nemithi.
Izinzuzo kanye nokungalungi kwe-Chromatography
Njenganoma iyiphi indlela yesayensi, i-chromatography inezinzuzo kanye nokungalungi okudingeka kucatshangelwe.
Izinzuzo:
1. Ukuzwela Okuphezulu: I-Chromatography ingathola futhi ihlukanise ama-compounds ngobuningi obuncane kakhulu.
2. Ukuguquguquka: Kungasetshenziswa ezinhlotsheni ezahlukene zamasampula, kufaka phakathi amagesi, uketshezi, kanye nezinto eziqinile.
3. Isivinini: Amasu athuthukile njenge-HPLC ne-GC avumela ukuhlaziywa okusheshayo.
4. Ukunemba Okuphezulu Nokunemba: Kusebenza kahle kakhulu ekuhlaziyweni kwezibalo kanye nekhwalithi.
Ukushoda:
1. Izindleko Eziphezulu: Imishini ye-chromatography eyinkimbinkimbi njenge-HPLC ne-GC iyabiza futhi idinga ukulungiswa njalo.
2. Imikhawulo Yenhlanganisela: Amanye amakhemikhali angase angafaneleki kumasu athile, isibonelo, amakhemikhali angaguquki awakwazi ukuhlaziywa yi-GC.
3. Amakhono Obuchwepheshe: Ukusebenzisa imishini ye-chromatography nokuhumusha imiphumela kudinga izinga eliphezulu lobuchwepheshe.
Ukusetshenziswa kwe-Chromatography
I-Chromatography isetshenziswa emikhakheni eyahlukahlukene yesayensi neyezimboni. Ezinye zezinhlelo zokusebenza eziyinhloko zifaka:
1. Ukuhlaziywa Kwemithi: Ukuhlukanisa nokuhlaziya izingxenye zemithi, kanye nokuhlola ubumsulwa nokuqina kwemikhiqizo yemithi.
2. Isayensi Yokudla: Isetshenziselwa ukuhlola ukungcola ekudleni naseziphuzweni, kanye nokuhlaziya ukwakheka kokudla okunomsoco kanye nezithasiselo.
3. Ucwaningo Lwezinto Eziphilayo: Ukuhlukanisa amaprotheni, ama-nucleic acid, kanye nama-metabolites ocwaningweni lwe-biochemical kanye nama-molecular.
4. I-Analytical Chemistry: Isetshenziswa ekuhlaziyeni kwemvelo kanye nokuhlolwa kwe-forensic ukuthola ukungcola, ubuthi, kanye namakhemikhali ayingozi.
5. Imboni Ye-Petrochemical: Ukuhlaziya izingxenye ze-petroleum kanye nemikhiqizo ye-petrochemical.
Isiphetho
I-Chromatography iyindlela ebalulekile futhi eguquguqukayo edlala indima ebalulekile kumakhemikhali, i-biology, kanye neminye imikhakha eyahlukene. Njengoba kunezindlela ezahlukahlukene ezitholakalayo, kusukela ku-chromatography yephepha elula kuya ku-HPLC eyinkimbinkimbi kanye ne-GC, iyaqhubeka nokuhlinzeka ngezixazululo zokuhlukanisa nokuhlaziya izingxube eziyinkimbinkimbi. Izinzuzo zayo ekuzweleni, isivinini, kanye nokunemba zenza kube ithuluzi elibalulekile ocwaningweni nasekusetshenzisweni okusebenzayo. Nakuba izindleko kanye nesidingo sobuchwepheshe kungaba yisithiyo, izinzuzo ezinikezwa yi-chromatography zidlula kakhulu ukubaluleka kwayo kokubili kwisayensi kanye nasembonini.
