Qhov sib txawv tseem ceeb ntawm arabinose thiab xylose yog tias arabinose yog aldopentose hom monosaccharide cais los ntawm cov pos hniav arabic, thaum xylose yog aldopentose hom monosaccharide cais los ntawm ntoo.
Hauv biochemistry, pentose yog monosaccharide uas muaj tsib carbon atoms. Cov tshuaj formula ntawm pentoses yog C5H10O5 Nws qhov hnyav molecular yog 150.13 g / mol. Aldopentoses yog subclass ntawm pentoses. Cov kab ntawv aldopentoses muaj carbonyl ntawm carbon 1 atom, tsim ib qho aldehyde derivative nrog cov qauv H-C(=O)-(CHOH)4-H. Qee cov aldopentoses, xws li ribose, yog cov ntsiab lus ntawm RNA. Phosphorylated aldopentoses xws li ribose 5 phosphate yog cov khoom tseem ceeb ntawm txoj kev pentose phosphate. Lwm cov tswv cuab tseem ceeb ntawm cov chav kawm no yog arabinose, xylose, thiab lyxose.
Arabinose yog dab tsi?
Arabinose yog ib qho aldopentose monosaccharide cais los ntawm cov pos hniav arabic. Cov pab pawg ua haujlwm ntawm arabinose yog aldehyde (CHO) pawg. Feem ntau, hauv qhov xwm txheej, D isoform ntawm saccharides ntau dua li L isoform. Txawm li cas los xij, nyob rau hauv cov ntaub ntawv ntawm arabinose L isoform, nws yog ntau tshaj li D isoform nyob rau hauv cov xwm, thiab nws muaj abundantly raws li ib feem ntawm biopolymers xws li hemicelluloses thiab pectin. L-arabinose operon (araBAD) koom nrog hauv catabolism ntawm arabinose hauv E. coli. Qhov no operon yog qhib rau hauv lub xub ntiag ntawm arabinose thiab tsis muaj qabzib hauv E. coli. Qhov operon no tau ua kom pom tseeb rau kev tshawb fawb txij li xyoo 1970 hauv molecular biology. Ntxiv mus, L-arabinose operon tuaj yeem siv rau kev tsim cov lus qhia raws li kev cai nruj.
Daim duab 01: Arabinose
Txoj kev classical ntawm biochemical synthesis ntawm arabinose yog los ntawm cov piam thaj los ntawm Wohl degradation. Lub xub ntiag ntawm arabinose qee zaum yog qhov qhia txog kev loj hlob ntawm cov kab mob. Qee qhov kev ntsuam xyuas cov organic acid kuaj xyuas qhov muaj arabinose, uas yuav qhia tau tias muaj kev loj hlob ntawm cov kab mob xws li Candida albicans. Tsis tas li ntawd, arabinose tuaj yeem siv los ua cov khoom qab zib thiab nyiam tus neeg sawv cev hauv kev lag luam khoom noj. Nws kuj yog ib qho tseem ceeb ntawm cov tshuaj nruab nrab uas tuaj yeem siv los tsim cov tshuaj tua kab mob nucleoside. Qee cov kab mob kuj muaj peev xwm tsim tau cov khoom siv hluav taws xob xws li ethanol thiab butanol los ntawm L arabinose los ntawm kev sib txuas ntawm caj ces.
YXylose yog dab tsi?
Xylose yog ib qho aldopentose monosaccharide cais tawm ntawm ntoo. Nws muaj tsib carbon atoms thiab ib pawg aldehyde ua haujlwm. Xylose yog muab los ntawm hemicelluloses, ib qho ntawm cov khoom tseem ceeb ntawm biomass. Nws tuaj yeem siv ntau cov qauv nyob ntawm seb tus mob, zoo li ntau lwm cov suab thaj. Ntxiv mus, raws li nws muaj ib pab pawg neeg dawb aldehyde, thiab nws yog ib tug txo cov suab thaj. Xylose yog lub tsev thaiv tseem ceeb ntawm hemicellulose xylan. Cov nroj tsuag zoo li birch muaj 30% xylan hauv lawv cov qauv, thaum cov nroj tsuag xws li spruce thiab ntoo thuv muaj txog 9% xylan hauv lawv cov qauv. Tsis tas li ntawd, xylose tuaj yeem pom nyob rau hauv cov qog tiv thaiv kab mob xws li Chrysolina coerulans.
Daim duab 02: Xylose
Xylose muaj ntau daim ntawv thov. Xylose tuaj yeem dehydrated rau furfural, uas yog biofuel precursor. Nws kuj yog metabolized los ntawm tib neeg. Nws tsim 2.4 calories rau 1 gram. Hauv cov tshuaj tsiaj, xylose yog siv los kuaj rau malabsorption. Qhov no yog ua los ntawm kev muab xylose hauv dej rau tus neeg mob tom qab yoo mov. Yog tias xylose raug kuaj pom hauv cov ntshav lossis zis hauv ob peb teev tom ntej, nws tau nqus los ntawm cov hnyuv. Xylose kuj tseem siv los tsim hydrogen. Tsis tas li ntawd, qhov txo qis ntawm xylose ua cov piam thaj hloov xylitol.
Dab tsi yog qhov zoo sib xws ntawm Arabinose thiab Xylose?
- Arabinose thiab xylose yog ob lub aldopentoses uas yog monosaccharides.
- Lawv yog cov derivatives ntawm hemicellulose.
- Lawv muaj tsib carbon atoms.
- Ob leeg sib koom tib yam tshuaj formula ntawm C5H10O5.
- Lawv muaj tib lub molecular hnyav ntawm 150.13 g / mol.
- Cov no tshwm sim li koob tsis muaj xim lossis prisms.
- Lawv pab pawg ua haujlwm yog aldehyde.
- Lawv muaj kev lag luam dav dav.
Qhov txawv ntawm Arabinose thiab Xylose yog dab tsi?
Arabinose yog aldopentose monosaccharide cais tawm ntawm cov pos hniav arabic, thaum xylose yog aldopentose monosaccharide cais los ntawm ntoo. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm arabinose thiab xylose. Tsis tas li ntawd, qhov ceev ntawm arabinose yog 1.585 g / cm33 Ntawm qhov tod tes, qhov ntom ntawm xylose yog 1.525 g / cm 3
Cov hauv qab no qhia txog qhov sib txawv ntawm arabinose thiab xylose hauv daim ntawv tabular rau ib sab ntawm kev sib piv.
Summary – Arabinose vs Xylose
Arabinose thiab xylose yog ob hom aldopentose monosaccharides. Lawv muaj tib cov tshuaj formula C5H10O5 Arabinose feem ntau yog cais tawm ntawm cov pos hniav arabic, thaum xylose feem ntau yog cais los ntawm ntoo. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm arabinose thiab xylose.
