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Amino Acid Npaj

Xi'an Naturetech Co., Ltd | Updated: Oct 09, 2017

Amino acid yog ib qho chaw hauv cov hydrogen atom rau pawg carbonyl ntawm cov carboxylic acid yog substituted nrog ib pawg amino, thiab cov amino acid molecule muaj ob hom amino thiab carboxyl pawg. Zoo sib xws rau cov hydroxy acid, amino acids yuav muab faib ua α-β-, γ -... w-amino acids raws li txoj haujlwm ntau ntawm cov amino pawg ntawm cov saw hlau, tab sis cov amino acids tau los ntawm lub raj tshuaj cov proteins uas yog ob qho tib si α-amino acids Muaj ntau xwb nees nkaum hom, lawv yog cov yooj yim rau cov khoom uas tsim cov protein.

Amino acids yog cov tshuaj uas tsim cov protein ntau rau cov khoom noj khoom haus. Yog ib qho organic compound uas muaj ib pawg neeg yooj yim thiab ib pawg neeg acidic carboxyl. Cov amino pawg yog ib qho α-amino acid txuas rau cov α-carbon. Feem ntau ntawm cov amino acids uas tsim cov protein yog α-amino acids.

Amino acids nyob rau hauv tib neeg lub cev los ntawm metabolism hauv plab yuav ua tau rau cov teebmeem nram qab no: ① protein ntau cov nqaij mos; ② mus rau hauv cov kua qaub, cov tshuaj hormones, tshuaj tiv thaiv, creatine thiab lwm yam tshuaj ammonia; ③ ua rau carbohydrates thiab nqaijrog; ④ oxidation carbon dioxide thiab dej thiab urea, tsim kom muaj zog

Amino acids rau lub cev tsis muaj lub cev, qhov chaw melting ntawm ntau tshaj 200 ℃, siab tshaj qhov nruab nrab melting point ntawm cov organic compounds. α-amino acid acid, qab zib, ntsim, tshiab 4 nyias saj. Glutamic acid monosodium ntsev thiab glycine yog qhov loj tshaj plaws ntawm cov khoom noj seasoning. Amino kis yog feem ntau soluble hauv dej, kua qaub kua thiab alkaline kua, insoluble lossis me ntsis soluble ethanol los yog ether thiab lwm cov organic solvents. Cov kua dej ntawm cov amino acids hauv dej yog qhov sib txawv heev. Piv txwv li, lub solubility ntawm tyrosine yog qhov tsawg tshaj plaws. Thaum 25 ℃, tyrosine dissolves tsuas yog 0.045 g hauv 100 g dej, tab sis qhov teeb meem ntawm tyrosine hauv cov dej kub hauv dej yog qhov loj. Lysine thiab arginine feem ntau tshwm sim nyob rau hauv daim ntawv ntawm hydrochloride, vim lawv yooj yim soluble hauv dej, vim deliquescence thiab nyuaj ua cov muaju.

(1) xim thiab xim Muaj ntau hom amino acids yooj yim ua cov xim tsis muaj kob, cov khoom siv lead ua los ntawm cov qauv ntawm cov amino acids sib txawv. Xws li L-glutamic kua qaub rau plaub-kem cylindrical Crystal, D-glutamic acid yog pob zeb diamond zoo li siv lead ua.

(2) cov pob zeb melting point amino acid crystallization ntawm melting point yog siab, feem ntau 200 ~ 300 ℃, ntau cov amino acids ntawm los yog ze ntawm lub tsho melting yuav zom mus rau amine thiab CO2.

(3) solubility Feem ntau ntawm cov amino acids yuav yaj nyob hauv dej. Qhov dej ntawm cov amino acids sib txawv hauv dej yog txawv, xws li lysine, arginine, proline solubility ntau dua, tyrosine, cysteine, histidine solubility yog me me. Muaj ntau hom amino acids tau yaj hauv muaj zog alkali thiab muaj zog cov kua qaub. Tab sis cov amino acids yog insoluble lossis me ntsis soluble hauv ethanol.

(4) saj cov amino acids thiab lawv cov derivatives muaj qee qhov kev paub ntawm saj, xws li kua qaub, qab zib, iab, thiab lwm yam. Qhov saj ntawm hom thiab hom amino acids, qauv peb sab. Los ntawm peb lub cev, feem ntau, D-hom amino acids yog qab zib, qhov tsos ntawm cov siab tshaj qhov sib haum L-hom amino acids.

(5) UV kev nqhis dej ntawm ntau yam kev pom muaj qee cov amino acids ntawm qhov pom kev pom yog tsis muaj peev xwm nqus tau. Tab sis tyrosine, tryptophan thiab phenylalanine nyob rau hauv cheeb tsam ultraviolet muaj pom lub teeb haum haum phenomenon. Thiab feem ntau ntawm cov protein muaj cov no peb cov amino acids, tshwj xeeb tshaj yog tyrosine. Yog li ntawd, cov ntsiab lus ntawm cov protein muaj peev xwm kuaj tau siv tus UV haum xeeb ntawm ib lub qhov ntev ntawm 280 hm.

Kev npaj ntawm cov amino acids

synthesis

Feem ntau ntawm cov amino acids uas tsim cov protein yog biochemically synthesized los ntawm Embden-Meyerhof txoj kab nrog citric acid intermediate. Qhov kos yog cov amino acid uas muaj ntxhiab tsw, histidine, tus qub biosynthesis nrog pentose phosphate pentose intermediate erythro-4-phosphate, uas yog synthesized los ntawm ATP nrog phosphoric acid ribose pyrophosphate. Microbes thiab nroj tsuag yuav ua rau tag nrho cov amino acids nyob rau hauv lub cev, cov tsiaj muaj ib feem ntawm cov amino acid tsis tau muab coj los ua vivo (tseem ceeb amino acids). Feem ntau cov amino acids feem ntau yog metabolized los ntawm carbohydrates, thiab ntau dua 14 lub cev uas tsim nyog rau biosynthesis, non-tseem ceeb amino acid synthesis los ntawm cov tshuaj tiv thaiv ua ke (6 theem lossis ntau dua), thiab cov synthesis ntawm cov amino acids uas yuav tsum tau ntxiv, ntawm cov kev tso dej hauv enzymes. Biosynthetic cov amino acids, ntxiv rau cov synthesis ntawm protein li raw cov ntaub ntawv, tab sis kuj rau alkaloids, lignin thiab lwm yam khoom cua. Ntawm qhov tod tes, cov amino acid yog decomposed nyob rau hauv lub cev nyob vim muaj cov keto acid ntawm amino ua haujlwm los yog oxidation, los yog decomposed los ntawm decarboxylation rau ib amine


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