2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Electrospray ionization (ESI) yog cov txheej txheem siv hauv huab cua spectrometry los tsim ionssiv cov electrospray uas muaj hluav taws xob siab siv rau cov kua los tsim cov aerosol. … Qhov tsis zoo no tuaj yeem kov yeej los ntawm kev sib txuas ESI nrog tandem huab hwm coj spectrometry (ESI-MS/MS).
Yuav ua li cas hauv electrospray ionisation?
Cov Txheej Txheem Electrospray Ionisation
Kev hloov pauv ntawm hom ionic los ntawm cov tshuaj mus rau hauv cov roj theem los ntawm ESI suav nrog peb kauj ruam: (1) dispersal ntawm cov tshuaj tsuag zoo ntawm cov tee dej, ua raws li. (2) Cov kuab tshuaj evaporation thiab (3) ion ejection los ntawm cov tee dej uas muaj nqi heev (Daim duab 1).
Vim li cas nws thiaj li muaj txiaj ntsig zoo rau ob peb lub electrospray ionization qhov chaw nrog lub quadrupole mass analyzer?
Electrospray ionization quadrupole mass spectrometry yog qhov tshwj xeeb tshaj yog muaj txiaj ntsig hauv kev tshawb fawb txog lub neej vim nws tsis tawg loj lom molecules zoo li lwm hom ionization ua. Qhov qeeb qeeb ntawm qhov ntws los ntawm electrosprayer, qhov me me ntawm cov tee dej kom ionized.
Tandem huab hwm coj spectrometry yog dab tsi?
Lub tandem huab hwm coj spectrometry yog cov txheej txheem tseem ceeb hauv kev txheeb xyuas thiab txheeb xyuas cov metabolites sib txawv [8]. Lub hom phiaj metabolomics sim nrog tandem huab hwm coj spectrometry ntsuas txhais cov kev hloov pauv ion los ntawm cov metabolites paub.
Vim li cas tandem MS zoo dua?
Fragments pom los ntawmEISA muaj siab dua cov teeb liab ntau dua li cov tsoos fragments uas raug kev puas tsuaj hauv cov hlwb sib tsoo ntawm tandem loj spectrometers. EISA ua kom cov ntaub ntawv sib cais tau ntawm MS1 cov ntsuas huab cua xws li lub sijhawm-ntawm-flight thiab ib qho cuab yeej quadrupole.
Pom zoo:
Thaum lub sijhawm nitration ntawm aniline cov amino pawg tiv thaiv los ntawm?
Cov nyom rau nitration ntawm aniline tau kov yeej los ntawm kev tiv thaiv ntawm cov amino pawg los ntawm acetylation. Cov acetyl pawg txo cov reactivity ntawm lub nplhaib thiab yog li nws oxidation tsis tshwm sim yooj yim nrog nitric acid HNO3.
Puas pab pawg pab pawg txhawb nqa pawg?
khoom plig stacks txhua lub sijhawm. Tam sim no, thaum koj qhib MyPlayer nav, nco ntsoov xyuas nrog koj cov xwm txheej. Feem ntau koj tsis tas yuav ua dab tsi kom tau txais koj VC los ntawm lawv, tab sis nws yuav pab tau rau hauv cov ntaub ntawv.
Los ntawm chromatography thiab huab hwm coj spectrometry?
Gas chromatography–mass spectrometry (GC-MS) yog ib qho kev tshuaj ntsuam xyuas uas muab cov yam ntxwv ntawm cov roj chromatography thiab huab hwm coj spectrometry rau txheeb xyuas cov khoom sib txawv hauv cov qauv ntsuas. … Zoo li cov kua chromatography–mass spectrometry, nws tso cai rau kev tsom xam thiab nrhiav tau txawm tias me me ntawm ib yam khoom.
Vim li cas pab pawg tsis ua haujlwm ntawm pab pawg?
Vim li cas pab neeg ua tsis tiav Tsis Muaj Kev Ntseeg. Thaum cov tswv cuab tsis ntseeg ib leeg, lawv zais lawv qhov tsis muaj zog thiab ua yuam kev. … Ntshai ntawm kev tsis sib haum xeeb. Thaum muaj kev ntshai ntawm kev tsis sib haum xeeb ntawm pab pawg, kev sib tham tseem ceeb tsis tshwm sim.
Thaum twg yog cov khoom lag luam ntawm ob pawg pab pawg sub?
feem ntau, cov khoom ntawm ob pawg S thiab T yog subgroup yog thiab tsuas yog ST=TS, thiab ob pawg sub yog hais kom permute. Yuav ua li cas rau ib pab pawg Ib pawg? A subset H ntawm pab pawg G yog ib pab pawg ntawm G yog tias nws tsis yog thiab kaw hauv qab cov khoom thiab hloov pauv .
