Taw qhia
Chemiluminescence yog cov txheej txheem txaus nyiam uas cuam tshuam nrog lub emission ntawm lub teeb raws li qhov tshwm sim ntawm cov tshuaj tiv thaiv tshuaj. Qhov tshwm sim no pom cov ntawv thov hauv ntau qhov chaw, suav nrog biochemistry, forensic science, thiab kuaj mob. Hauv tsab xov xwm no, peb yuav tshawb txog kev tshawb fawb tom qab chemiluminescence thiab nws ua haujlwm li cas.
Chemiluminescence yog dab tsi?
Chemiluminescence yog qhov tsim ntawm lub teeb raws li qhov tshwm sim ntawm cov tshuaj tiv thaiv. Lub teeb yog tsim los ntawm lub xeev zoo siab ntawm cov reactants los yog intermediates uas tshwm sim los ntawm cov tshuaj tiv thaiv. Kev tsim hluav taws xob tsis tas yuav tsum muaj cua sov lossis lub zog hluav taws xob sab nraud, thiab cov txheej txheem yog spontaneous.
Chemiluminescence ua haujlwm li cas?
Cov tshuaj tiv thaiv chemiluminescence tshwm sim hauv ob peb kauj ruam. Thawj kauj ruam yog qhov excitation ntawm ib tug electron nyob rau hauv ib tug reactant los yog nruab nrab molecule. Qhov no feem ntau tshwm sim thaum lub molecule absorbs lub zog los ntawm cov tshuaj tiv thaiv exothermic los yog los ntawm cov molecule zoo siab uas los rau hauv kev sib cuag nrog nws.
Thaum lub electron zoo siab, nws txav mus rau qib siab zog, tsim lub xeev zoo siab molecule. Cov molecule no feem ntau tsis ruaj khov thiab zoo li ploj mus rau qib qis zog los ntawm kev tso tawm lub zog ntau dhau li lub teeb. Lub teeb tawm tuaj yeem nyob ntawm ultraviolet (UV) mus rau qhov pom ntau yam, nyob ntawm seb cov reactants thiab cov tshuaj tiv thaiv.
Cov tshuaj tiv thaiv chemiluminescence tuaj yeem muab faib ua ob hom: ncaj qha thiab tsis ncaj. Nyob rau hauv cov tshuaj tiv thaiv ncaj qha, cov reactants lawv tus kheej ua rau lub xeev zoo siab tsim thiab tom qab lwj, ua rau lub teeb emissions. Hauv cov tshuaj tiv thaiv tsis ncaj, kev tsim cov teeb pom kev zoo los ntawm ib hom kab nruab nrab uas yog tsim thaum cov tshuaj tiv thaiv.
Direct Chemiluminescence
Direct chemiluminescence feem ntau tshwm sim thaum lub zog tso tawm thaum lub sij hawm tshuaj lom neeg cov tshuaj tiv thaiv thiab xa ncaj qha mus rau ib lub molecule, ua rau nws zoo siab heev. Cov molecule zoo siab ces rov qab mus rau hauv av hauv av los ntawm emitting lub teeb. Muaj ob peb yam piv txwv ntawm kev ncaj qha chemiluminescence, nrog rau oxidation ntawm luminol, cov tshuaj tiv thaiv ntawm hydrogen peroxide nrog luminol, thiab combustion ntawm magnesium.
Ib qho piv txwv nrov tshaj plaws ntawm chemiluminescence ncaj qha yog cov tshuaj tiv thaiv ntawm luminol nrog hydrogen peroxide. Luminol yog ib qho molecule uas feem ntau yog siv los ua cov tshuaj reagent los xyuas cov ntshav. Nyob rau hauv lub xub ntiag ntawm hydrogen peroxide thiab ib tug catalyst, xws li hlau ntsev, luminol undergoes oxidation cov tshuaj tiv thaiv uas ua rau tsim ib tug zoo siab lub xeev molecule. Cov molecule no ces poob lub zog los ntawm emitting lub teeb uas yuav ntes tau los ntawm ib tug tshwj xeeb imaging ntaus ntawv.
Indirect Chemiluminescence
Indirect chemiluminescence tshwm sim thaum lub zog hloov mus rau qhov nruab nrab molecule, uas tom qab ntawd hloov lub zog mus rau lwm lub molecule uas zoo siab heev. Qhov zoo siab molecule ces lwj mus rau hauv av, emitting lub teeb. Ib qho piv txwv ntawm indirect chemiluminescence yog cov tshuaj tiv thaiv ntawm hydrogen peroxide thiab horseradish peroxidase (HRP).
HRP yog ib qho enzyme uas feem ntau siv los ua daim ntawv lo hauv immunoassays vim tias nws tuaj yeem ua rau oxidation ntawm chromogenic lossis fluorogenic substrate, tsim cov khoom xim lossis fluorescent. Thaum HRP raug rau hydrogen peroxide, cov enzyme nkag mus rau cov tshuaj tiv thaiv uas ua rau tsim cov tshuaj nruab nrab. Qhov nruab nrab no ces reacts nrog luminol, uas yuav zoo siab thiab emits lub teeb.
Indirect chemiluminescence tuaj yeem tshwm sim los ntawm tus txheej txheem hu ua lub zog hloov cov tshuaj tiv thaiv. Nyob rau hauv cov txheej txheem no, ib tug zoo siab molecule hloov nws lub zog mus rau lwm lub molecule, uas ces ua zoo siab thiab emits lub teeb.
Kev siv ntawm Chemiluminescence
Chemiluminescence muaj ntau daim ntawv thov hauv ntau qhov chaw, suav nrog biochemistry, forensic science, thiab kev kuaj mob. Hauv biochemistry, chemiluminescence yog siv los kuaj pom muaj cov molecules tshwj xeeb, xws li cov proteins, enzymes, thiab nucleic acids, hauv cov qauv lom neeg. Qhov no yog ua tiav los ntawm kev sau npe cov molecules nrog chemiluminogenic substrates uas emit lub teeb nyob rau hauv muaj cov enzymes tshwj xeeb.
Chemiluminescence kuj tau siv dav hauv kev tshawb fawb forensic los kuaj ntshav thiab lwm yam kua dej lom neeg ntawm qhov chaw ua txhaum cai. Luminol, raws li tau hais ua ntej, feem ntau siv hauv daim ntawv thov no. Hauv daim ntawv thov no, cov tshuaj tiv thaiv chemiluminescence yog ua raws li cov ntaub ntawv yees duab, uas tuaj yeem siv los ua pov thawj hauv tsev hais plaub.
Hauv kev kuaj mob, chemiluminescence yog siv los kuaj pom muaj cov tshuaj tiv thaiv tshwj xeeb lossis cov tshuaj tiv thaiv kab mob hauv cov kua dej lom, xws li ntshav thiab zis. Qhov no yog ua tiav los ntawm kev sau npe cov molecules nrog chemiluminogenic substrates uas emit lub teeb nyob rau hauv muaj cov antigens tshwj xeeb los yog cov tshuaj tiv thaiv.
Xaus
Hauv cov ntsiab lus, chemiluminescence yog qhov tshwm sim txaus nyiam uas cuam tshuam nrog lub emission ntawm lub teeb raws li qhov tshwm sim ntawm cov tshuaj tiv thaiv tshuaj. Cov txheej txheem no tau pom ntau daim ntawv thov hauv ntau yam, suav nrog biochemistry, forensic science, thiab kev kuaj mob. Cov txheej txheem ntawm chemiluminescence cuam tshuam cov excitation ntawm electrons nyob rau hauv reactants los yog intermediates, ua raws li los ntawm lawv lwj mus rau hauv av lub xeev los ntawm emitting lub teeb. Muaj ob lub ntsiab ntawm chemiluminescence: ncaj qha thiab tsis ncaj, uas txawv ntawm lub teeb emission.