Elabhorethri yokuhlaziya yesimanje, i-chromatography ingaphezu kakhulu kwephrothokholi evamile; kuwumdanso oyinkimbinkimbi wokusebenzelana kwamangqamuzana. Ukuthi ubala ukungcola kwezemithi noma uthola ukungcola kwemvelo emazingeni okulandela umkhondo, ukuqonda i-physics eyisisekelo yokwehlukana kwakho yilokho okuhlukanisa uchwepheshe kumdwebi wamakhromatograph oyinhloko.
Impumelelo kulebhu ayiveli nje ezilungiselelweni zezinsimbi ezisezingeni eliphezulu. Ihlala ekusebenzisaneni phakathi kwekhemistri yendlela yakho kanye nezinto ezisebenzisekayo zekhwalithi ephezulu ezivikela ubuqotho bakho besampula. Kulabo abazulazula ezinkingeni ze
I-HPLC vs LC-MS: Yikuphi Ongakukhetha
, noma ukulwa nesisekelo esingazinzile, lo mhlahlandlela wabelana ngezimfihlo eziseceleni kwebhentshi ukuze kuzuzwe idatha esezingeni lomhlaba kanye nokukhulisa isikhathi sokusebenza kwethuluzi.
Ukuqonda Ukuxhawula Kwe-Hydrophobic: Iyini I-Reverse Phase Chromatography?
Ukuze uphendule umbuzo oyisisekelo—iyini i-chromatography yesigaba esibuyela emuva—umuntu kufanele abheke ngale kwencazelo yencwadi yokufunda. Emgogodleni wayo, kuwukuhlukaniswa okusekelwe "ukwesaba amanzi" (hydrophobicity). Esigabeni esibuyela emuva se-high pressure liquid chromatography (RP-HPLC), sisebenzisa isigaba sokuma okungesona i-polar kanye nesigaba seselula se-polar ukuze sihlele ama-molecule ngohlamvu lwawo lwe-hydrophobic.
Ikhemistry ye-C18 (Octadecyl) Chain
Isigaba esivamile sokumisa sihlanganisa izinhlayiya ezisekelwe ku-silica eziboshwe ngamaketanga e-C18 (octadecyl). Kusukela kokuhlangenwe nakho kwami, ukuminyana kwala maketango e-C18 kanye nekhwalithi yokusekelwa kwe-silica kunquma ukuqina kwendlela yakho. Abahlaziyi abaningi bahlangabezana ne-peak tailing lapho behlaziya amakhompawundi ayisisekelo. Lokhu kuvame ukubangelwa amaqembu e-silanol ayinsalela endaweni ye-silica esebenza njengeziza ezingafuneki zokushintshana nge-ion.
Ukuxazulula lokhu, sisebenzisa ikholomu ene-end-capped, lapho ama-silane amancane "efihla" lawa masayithi asebenzayo. Nokho, ngisho nekholomu engcono kakhulu ayikwazi ukulungisa umjovo ongemuhle. Uma inani eliphakeme le-chromatographic libukeka lihlanekezelwe ngaphambi kokuthi lishaye ikholomu, hlola ibhodlela lakho. Ukusebenzisa ukuhlanzeka okuphezulu
9mm Izitsha Zochungechunge Olufushane ezine-Universal Fit
iqinisekisa ukuthi i-analyte yakho ayikhangisi ezindongeni ze-vial ngaphambi kokuyicosha inaliti.
I-Art of the Organic Modifier in HPLC Method Development
Isikhathi sokugcinwa sabahlaziyi bakho sibuswa ukugxilisa kwe-HPLC kwe-organic modifier. Ngokulungisa isilinganiso se-Acetonitrile noma i-Methanol kubhafa yakho enamanzi, ushuna "amandla elution" esigaba seselula.
Umgodi ovamile engiwubona ekudlulisweni kwendlela ijika le-gradient elution elingaqondwa kahle. Uma ugingqa isilungisi sakho sezinto eziphilayo ngokushesha okukhulu, ulahlekelwa ukulungiswa; kancane kakhulu, futhi uhlushwa ukunwetshwa okuphezulu nokumoshakala kwe-solvent. Lapho ushintsha phakathi
I-Analytical vs Preparative HPLC
, ukuphatha i-gradient slope kuba isici esiyinhloko ekunyuseni isikali ngempumelelo. Khumbula, i-Acetonitrile inikeza i-viscosity ephansi namandla e-lution aphezulu, kuyilapho i-Methanol inganikeza ukukhetha okuhlukile kwezinhlanganisela ze-polar okungenzeka i-ACN ziphuthelwe.
Ukucacisa i-GC Elution Order: Ukubikezela Ukuhlukaniswa Kwenhlanganisela
Ukubikezela i-gc elution order kungenye yezinselelo ezizuzisa kakhulu ze-gas chromatographer. Ngokungafani ne-HPLC, lapho ikhemikhali ye-solvent iyisivikelo esiyinhloko, ukuhlukaniswa kwe-GC kunqunywa "uZiqu-zintathu Wokuhlukaniswa": iphoyinti elibilisayo, i-polarity yamamolekyuli, nohlelo lokushisa lwekholomu.
I-Thermodynamics vs. Dipole Interactions
Esigabeni sokuma okungesona i-polar, i-oda le-gc elution lilandela ngokuqinile iphoyinti elibilayo. Izinhlanganisela eziguquguqukayo kakhulu ziphuma kuqala. Nokho, igeyimu iyashintsha uma usebenzisa ikholomu ye-polar njenge-PEG\/Wax. Ngisanda kuphatha iphrojekthi ehlanganisa ama-isomer lapho amaphuzu abilayo acishe afane. Ngokushintshela esigabeni se-polar, ukusebenzisana kwe-dipole-dipole kusivumele ukuthi sihlukanise lezi zinhlanganisela ngokusekelwe kusakhiwo sazo se-elekthronikhi kunosayizi wazo.
Ngomsebenzi ozwela kakhulu njengokuhlaziywa komkhondo wemvelo, ubuqotho besiqukathi sakho esiyisampula sibalulekile. Ukusebenzisa
20mm Crimp Top Headspace Izitsha
kuvimbela ukulahlekelwa abahlaziyi abaguquguqukayo, iqinisekisa ukuthi ukuguqulwa kwakho kwe-spectral enkulu kusekelwe ekumeleleni kwangempela kwesampula yakho, hhayi ingxenyenamba eputshuziwe.
I-HPLC vs LC-MS: Ukuzulazula ku-Sensitivity Shift
Umbuzo ovamile kulebhu yethu uthi: "Kufanele sisuke nini ukusuka ku-HPLC vs LC-MS?" Impendulo ilele ekuzweleni kwakho okudingekayo. Nakuba i-HPLC enokutholwa kwe-UV iyinhle kakhulu ku-QC yenjwayelo kumazinga we-microgram, i-LC-MS iyadingeka lapho udinga ukuthola amazinga e-picogram noma ukukhomba okungaziwa kumatrices ayinkimbinkimbi.
Uma uthuthela ku-LC-MS, ukukhetha kwakho izitsha kuba bucayi kakhulu. Amakepisi ajwayelekile angangenisa ama-plasticizers esigabeni sakho seselula, adale "Ghost Peaks" ahlukumeza ichromatogram yakho. Yingakho i-Aijiren's
I-Bonded Screw Caps
ziyisisekelo kumalebhu aqinisekisiwe we-MS-aqeda ingozi yokuthi i-septa iwele ku-vial noma ukungcola okuleaching kumtshina.
I-Anatomy ye-Perfect Chromatographic Peak
Lonke inani eliphakeme le-chromatographic liyithuluzi lokuxilonga. Ukuphakama kwe-Gaussian ebukhali, elinganayo ikutshela ukuthi isistimu yakho ithuthukisiwe. "Ihlombe" noma "umsila" ukutshela ukuthi kukhona okungalungile, ngokuvamile okuhlobene ne-hardware noma ivolumu efile.
Ukuqeda Ivolumu Efile kanye Nevolumu Yekholomu Eyengeziwe
Omunye wababulali abathule bokulungiswa yivolumu efile. Uma kukhona igebe phakathi kwenaliti yakho nephansi lebhodlela, isampula liyahlakazeka. Ukuze uthole amasampula amancane, ngihlala ngincoma ukusebenzisa i-Conical Insert. Lokhu kufaka kuphoqelela isampula kumzila omncane, oqondile, oqinisekisa umjovo "wepulaki elibukhali". Lokhu kuholela ngokuqondile esiqongweni esibukhali kanye nezilinganiso ezingcono zesignali-kuya-nomsindo, ikakhulukazi kumasistimu anengcindezi ephezulu lapho ukuhlakazeka kuyisitha.
Ukuxazulula Izinkinga Njenge-Pro: Ukusuka Kumsindo Oyisisekelo kuya ku-Septa Coring
Eminyakeni yami yokuxazulula izinkinga, ngithole ukuthi u-70% wezinkinga zensimbi empeleni yizinkinga ezisebenzisekayo.
-
Isisekelo Somsindo & Iziqongo Zomoya: Uma ubona iziqongo lapho kungafanele zibe khona, izihlungi zakho zingase zibe yimbangela. Njalo ubheke
Umhlahlandlela ophelele wezihlungi ze-Micron ezingu-0.22
ngaphambi kokukhetha izihlungi zakho zesirinji.
-
I-Septa Coring: Uma ubona izingcezu ze-silicone ku-vial yakho, inaliti yakho "ihlanganisa" i-septa. Lokhu kwenzeka ngamakepisi asezingeni eliphansi. I-ND11 Crimp Caps yethu kanye ne-10-425 Screw Caps zenziwe ngokunemba ukuze zimelane nokubhoboza okuningi ngaphandle kokuhlukana.
-
Ukuzinza Kwisitoreji: Ngezindlela ze-EPA noma isitoreji sesikhathi eside, kusetshenziswa
24-400 EPA Izitsha
eyenziwe ngengilazi ye-borosilicate iqinisekisa ukulahlekelwa kwe-solvent ye-zero kanye nokungcoliswa kwe-zero.
Kungani Ubuqotho Bedatha Iqala Ngokusebenzisekayo
Sivamise ukuchitha u-50,000 USD ohlelweni olusezingeni eliphezulu, bese sizama ukonga amasenti ku-vial. Ngokuhlangenwe nakho kwami, i-sub-par vial iyinto ebiza kakhulu elebhu yakho ngoba iholela "ekuqaliseni kabusha" kanye "nokuqinisekiswa okuhlulekile."
Kungakhathaliseki ukuthi udinga i-1ml Shell Vials ukuze uthole i-chromatography elula noma i-18mm Screw Thread Headspace Vials ye-GC ezenzakalelayo, i-Aijiren inikeza ukuvumelana okufunwa ochwepheshe. Siqinisekisa ukuthi i-oda lakho le-gc elution liphinda likhiqizeke usuku nosuku, futhi inani eliphakeme le-chromatographic lihlala libukhali njengosuku owasungula ngalo indlela.
Ukusekela Kochwepheshe & Imibuzo: Ingabe ubhekene nemiphumela engahambisani noma unenkinga yokuthuthukiswa kwendlela? Masithuthukise ukuhamba kwakho komsebenzi ndawonye. Ngithinte ukuze uthole ukubonisana nobuchwepheshe:
Isiphetho Ukwenza kahle ukuthi iyini isigaba sokuhlehla nokuba ingcweti kwama-nuances ensimbi yakho kuwuhambo lokufunda okuqhubekayo. Ngokukhetha isilungisi semvelo esilungile i-HPLC kanye nezinto ezisetshenziswayo ezisesigabeni ezihamba phambili, utshala iqiniso ledatha yakho. Ungavumeli i-sub-par vial yonakalise indlela enhle owachitha amaviki ukhula.
IsiNgisi
IsiShayina
