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Amino Acid Acid Base Titration Curve

Xi'an Naturetech Co., Ltd | Updated: Nov 02, 2017

Amino acids yog cov compounds uas raug hloov los ntawm amino acids, uas muaj cov amino thiab carboxyl pawg. Zoo li hydroxy acids, amino acids yuav muab faib ua alpha-beta, gamma -... W - amino acids, tab sis cov amino acids uas tau los ntawm proteolysis yog alpha-amino acids, thiab tsuas muaj ob lub kaum ntawm lawv, uas yog cov txheej txheem yooj yim uas tsim cov protein ntau.

Amino acids yog cov tshuaj uas tsim cov protein ntau rau cov khoom noj khoom haus. Organic compounds muaj alkaline amino acids thiab acidic carboxyl pawg. Cov amino pawg yog alpha-amino on alpha carbon. Cov amino acids uas ua cov proteins uas feem ntau yog alpha-amino acids.

Cov amino acids tuaj yeem ua cov haujlwm hauv qab no hauv lub cev los ntawm cov metabolism: Ua cov acids, hormones, tshuaj tua kab mob, creatine, etc. Hloov carbohydrates thiab cov rog; Nws oxidizes carbon dioxide thiab dej thiab urea, ua zog.

Amino acids li tsis muaj xim, ntau tshaj li 200 ℃, melting point tshaj qhov nruab nrab ntau tshaj ntawm qhov nruab nrab ntawm cov organic tebchaw. Alpha-amino acid muaj plaub yam sib txawv ntawm cov kua qaub, qab zib, iab thiab tshiab. Monosodium glutamate thiab glycine yog cov feem ntau siv flavorings. Cov kabmob kis kabmob no feem ntau tsis tsim nyob rau hauv dej, kua qaub kua thiab alkali daws, tsis yog soluble lossis soluble organic solvents xws li ethanol lossis ether. Amino acids nyob rau hauv cov dej solubility ntawm qhov txawv yog loj heev, xws li cov tsawg solubility tyrosine, 25 ℃, tyrosine yaj tsuas 0.045 g 100 g dej, tab sis nyob rau hauv cov phom kub kub tyrosine solubility loj dua. Lysine thiab speramate feem ntau tam sim no nyob rau hauv daim ntawv ntawm hydrochloric acid, vim tias lawv yog cov dej ntau nyob rau hauv dej thiab nyuaj rau crystallize vim yog deliquescence [5].

(1) xim thiab xim ntawm ntau hom amino acids yog ib qho yooj yim kom muaj xim tsis muaj zog, thiab cov duab crystalline nws txawv nrog cov qauv ntawm cov amino acids. Piv txwv, l-monoglutamic acid yog tetragon, thiab D monoglutamic acid yog lub pob zeb diamonds zoo li.

(2) amino acid crystallization ntawm melting point high, melting point yog feem ntau 200 ~ 200 ℃, ntau cov amino acids nyob rau ntawm los yog ze rau ntawm qhov chaw chwv yuav raug rhuav tshem mus rau amine thiab CO2.

(3) feem ntau cov amino acids ntawm solubility yog soluble hauv dej. Lub solubility ntawm cov amino acids sib txawv hauv dej txawv, xws li lysine, arginine, thiab proline solubility. Lub solubility ntawm tyrosine, cysteine ​​thiab histidine yog heev me me. Txhua yam ntawm cov amino acids yog cov tshuaj tsuag hauv cov hauv paus muaj zog thiab muaj zog cov acids. Tab sis cov amino acids yog insoluble lossis me ntsis soluble hauv ethanol.

(4) cov amino acids thiab lawv cov dej caw muaj qee qhov saj, xws li qaub, qab zib, iab, thiab lwm yam. Qhov tsw ntawm hom yog hais txog hom amino acid thiab qauv peb sab. Feem ntau hais lus, d-hom amino acid muaj lub qab zib saj, thiab nws cov qab zib siv ntau dua qhov sib txig L 1 cov amino acid.

(5) lub cev nqus ntawm ultraviolet absorption ntawm ntau hom amino acids tsis muaj peev xwm nqus pom lub teeb. Tab sis tyrosine, tryptophan thiab phenylalanine muaj kev yees duab photoabsorption hauv cheeb tsam ultraviolet. Feem ntau cov proteins uas muaj cov amino acids no, tshwj tyrosine. Yog li ntawd, cov ntsiab lus ntawm cov protein yuav xam pom tau los ntawm uv haum yam ntxwv ntawm 280hm wavelength.

Amino acid acid puag tetration nkhaus

Glycine, Piv txwv: Mo glycine soluble hauv dej, kua pH 5.97, nrog cov qauv NaOH thiab HCl titration feem, cov tshuaj pH tus nqi raws li cov kab, muab HCl thiab NaOH, lub abscissa qhia cov moles ntawm daim duab, titration nkhaus . Ib qho tseem ceeb heev ntawm qhov kev nkhaus no yog qhov ntawm pH = 2.34 thiab pH = 9.60, muaj ob lub ntsiab lus tseem ceeb, uas yog pK1 thiab pK2 feem. Txoj cai: pH [R]. > pH> pK2 ', [R] [R]] [R +]; Thaum lub pH pI, qhov nuj nqi qis yog xoom, [R] = [R-]; Thaum lub pH Thaum koj muaj lub pH ntawm> PI, qhov nuj nqi yog "-


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