L-Tyrosine |60-18-4
IiNkcazo zeeMveliso
I-Tyrosine (efinyeziweyo njengeTyr okanye i-Y) okanye i-4-hydroxyphenylalanine, yenye ye-amino acids ye-22 esetyenziswa ziiseli ukwenza iiprotheni.I-UAC yayo kunye ne-UAU.Yi-amino acid engabalulekanga kunye neqela le-polar side.Igama elithi "tyrosine" lisuka kwigama lesiGrike elithi tyros, elithetha itshizi, njengoko lafunyanwa okokuqala ngo-1846 ngusokhemisti waseJamani uJustus von Liebig kwiproteincasein esuka kwitshizi.Ibizwa ngokuba yi-tyrosyl xa kubhekiselwa kuyo njengeqela elisebenzayo le-chainor side chain.yrosine yi-precursor ye-neurotransmitters kwaye inyusa amanqanaba e-plasmaneurotransmitter (ingakumbi i-DOPAM kunye ne-norepinephrine) kodwa iyancipha ukuba nayiphi na impembelelo kwisimo sengqondo.Impembelelo kwimo yengqondo ibonakala ngakumbi kubantu abaphantsi kweemeko zoxinzelelo.
Ngaphandle kokuba yiproteinogenic aminoacid, i-tyrosine inendima ekhethekileyo ngenxa yokusebenza kwephenol.Itoccurs kwiiprotheyini eziyinxalenye yeenkqubo zokudluliselwa kwemiqondiso.Isebenza njengomamkeli wamaqela ephosphate athi adluliselwe ngendlela yeproteinkinases (ebizwa ngokuba yi-receptor tyrosine kinases).I-Phosphorylation ye-hydroxylgroup itshintsha umsebenzi weprotheni ekujoliswe kuyo.
Intsalela yetyrosine nayo idlala indima ebalulekileyo kwiphotosynthesis.Kwii-chloroplasts (i-photosystem II), isebenza njengomnikeli we-anelectron ekunciphiseni i-chlorophyll ene-oxidized.Kule nkqubo, idlula kwi-deprotonation ye-phenolic yayo yeqela le-OH.Le radical ithotywa emva koko kwi-photosystem II ngamaqela amane angundoqo emanganese.
Izifundo ezininzi ziye zafumanisa ukuba i-tyrosine inokuba luncedo ngexesha leemeko zoxinzelelo, ukubanda, ukudinwa, ukuphulukana nomntu omthandayo njengokufa okanye uqhawulo-mtshato, umsebenzi omde kunye nokungalali ngokwaneleyo, kunye nokunciphisa amanqanaba ehomoni yoxinzelelo, ukunciphisa uxinzelelo-olubangelwa ukuncipha kobunzima obubonwayo. izilingo zezilwanyana, ukuphuculwa kokusebenza kwengqondo kunye nomzimba kubonwa kwizinto zoluntu;nangona kunjalo, ngenxa yokuba i-tyrosine hydroxylase yi-enzyme yokunciphisa izinga, iziphumo azibalulekanga kakhulu kunezo ze-L-DOPA.
I-Tyrosine ayinayo nayiphi na impembelelo ebalulekileyo kwimoya, ingqondo okanye ukusebenza komzimba kwiimeko eziqhelekileyo.Umlinganiselo wemihla ngemihla wovavanyo lweklinikhi oluxhaswa kwiincwadi malunga ne-100 mg / kg kumntu omdala, olingana ne-6.8 grams kwi-150 lbs.Idosi eqhelekileyo ifikelela kwi-500–1500 mg ngosuku (idosi ecetyiswe ngabakhiqizi abaninzi; idla ngokulingana ne-1–3 yee-capsules zetyrosine ecocekileyo).Akukhuthazwa ukuba kudlule i-12000 mg (12 g) ngosuku.
Inkcazo
Izinto | Umgangatho | Iziphumo zovavanyo |
Ujikelezo oluKhethekileyo[a]ᴅ²⁰ | -9.8 ° ukuya-11.2 ° | -10.4 ° |
I-Chloride(CI) | Akukho ngaphezu kwe-0.05% | <0.05% |
Sulfate(SO₄) | Akukho ngaphezu kwe-0.04% | <0.04% |
Intsimbi(Fe) | Akukho ngaphezu kwe-0.003% | <0.003% |
Iintsimbi ezinzima | Akukho ngaphezu kwe-0.00015% | <0.00015% |
Ilahleko ekomisweni | Akukho ngaphezu kwe-0.3% | <0.3% |
Intsalela kwi-Ignition | Akukho ngaphezu kwe-0.4% | <0.4% |
Isivavanyi | 98.5%-101.5% | 99.3% |
Ukuqukumbela | Ukuhambelana nomgangatho we-USP32 |