Vitamin D3(cholecalciferol) thiab vitamin D2 (ergocalciferol) yog cov vitamin D. Raws li ib tug fat-soluble vitamin, VD yog nrog anti-rickets nyhuv. Nws yog ib lub ntsiab lus dav dav rau cov qauv zoo sib xws sterol derivatives. Yog li ntawd, dab tsi peb txhais los ntawm vitamin D tsis yog ib yam khoom tab sis ib pawg ntawm cov yam ntxwv zoo sib xws. Ntawm lawv, vitamin D3 thiab vitamin D2, uas ua lub luag haujlwm hauv tib neeg kev noj haus, muaj tib lub luag haujlwm ntawm lub cev. Tab sis lawv kuj muaj ntau qhov sib txawv, thiab tsab xov xwm no yuav qhia lawv rau koj.
Vitamin D2 vs Vitamin D3
1. Txhais:
Vitamin D2' lub npe tshuaj yog ergocalciferol, thiab ergocalciferol yog ib qho qhib-ring steroid tsim los ntawm cleavage ntawm tshuaj bonds ntawm steroids nyob rau hauv photochemical kev txiav txim.
Vitamin D3 tseem hu ua cholecalciferol. Cov 7-dehydrocholesterol uas ua los ntawm dehydrogenation ntawm cov roj cholesterol tuaj yeem raug irradiated nrog ultraviolet lub teeb los tsim cholecalciferol. Qhov no txhais tau hais tias provitamin D ntawm cholecalciferol yog 7-dehydrocholesterol.
2. Lub cev thiab tshuaj muaj zog:
Cov tsos mob thiab cov khoom ntawm vitamin D2 yog cov tsis muaj ntxhiab tsw. Nws muaj qhov ceev ntawm 0.97 g / cm3, lub melting point ntawm 114-118 ° C (lit.), boiling point ntawm 504.2ºC ntawm 760 mmHg, ib tug flash point ntawm 218.2ºC, ib tug refractive index ntawm 1.53, thiab cia tej yam kev mob. ntawm 2-8 ºC.
Cov tsos thiab cov khoom ntawm vitamin D3 yog crystalline. Nws muaj qhov ntom ntom ntawm 0.96 g / cm3, lub ntsiab lus melting ntawm 83-86 ° C (lit.), kub taw tes ntawm 496.4ºC ntawm 760 mmHg, lub teeb nyem ntawm 214.2ºC, qhov ntsuas qhov ntsuas ntawm 1.507 (15ºC), ruaj khov ntawm chav tsev kub thiab siab, thiab cia txias txias yog 2-8ºC.
3. Qhov chaw:
Vitamin D2, tseem hu ua ergocalciferol, yog tsim los ntawm ultraviolet hluav taws xob los ntawm ergosterol hauv cov nroj tsuag. Cov zaub mov raws li cog xws li nplej, zaub, thiab txiv hmab txiv ntoo muaj cov vitamin D2 me me, thiab cov nceb muaj cov nqi siab.
Vitamin D3yog hloov los ntawm 7-dehydrocholesterol nyob rau hauv tib neeg los yog tsiaj epidermis thiab dermis hlwb los ntawm photochemical tshuaj tiv thaiv los ntawm ultraviolet irradiation. Lub epidermis thiab daim tawv nqaij ntawm cov tsiaj siab dua feem ntau muaj 7-dehydrocholesterol.
4. Kev ua si lom neeg
Kev ua haujlwm lom ntawm vitamin D3 muaj zog dua li ntawm cov vitamin D2. Vitamin D3 nce thiab tswj cov ntshav 25 (OH)D concentrations kwv yees li 87% siab dua vitamin D2, thiab vitamin D3 cov khw muag khoom rog yog 2-3 zaug siab dua vitamin D2.
5. Kev pheej hmoo ntawm kev noj tshuaj ntau dhau
Kev noj ntau dhau ntawm cov vitamin D2 thiab vitamin D3 tuaj yeem ua rau muaj toxicity vim hypercalcemia.
Tab sis cov vitamin d2 yog me me, yog li nyob rau hauv ib qho overdose, vitamin d2 yog ntau zam thiab tsis tshua muaj kev pheej hmoo tshaj vitamin d3.
Vitamin D3 muaj zog ua haujlwm, thiab kev noj ntau dhau tuaj yeem ua rau calcification ntawm pob txha mos.
Cov ntsiab lus
Vitamin D2 thiab D3 yog cov as-ham tseem ceeb rau kev noj qab haus huv tib neeg, thiab ua lub luag haujlwm tseem ceeb hauv kev tswj cov metabolism hauv lub cev thiab tswj kev ua haujlwm ntawm lub cev. Tam sim no, nws ntseeg tau tias cov nyhuv lom ntawm vitamin D3 muaj zog dua li cov vitamin D2, yog livitamin D3feem ntau yog xaiv los ua ib qho ntxiv.