Shaanxi BLOOM Tech Co., Ltd. yog ib qho ntawm cov tuam ntxhab thiab cov muag khoom ntawm vanillic acid cas 121-34-6 hauv Suav teb. Txais tos rau cov lag luam wholesale bulk zoo vanillic acid cas 121-34-6 muag ntawm no los ntawm peb lub hoobkas. Kev pabcuam zoo thiab tus nqi tsim nyog muaj.
Vanillic acid,Kuj hu ua 4-hydroxy-3-methoxybenzoic acid, zoo li dawb odorless crystals los yog hmoov, yooj yim soluble nyob rau hauv ethanol, soluble nyob rau hauv ether, thiab me ntsis soluble nyob rau hauv dej. Nws yog lub caij ntuj no muaj nyob hauv cov nroj tsuag thiab txiv hmab txiv ntoo, thiab tuaj yeem ua los ntawm oxidation ntawm vanillin. Nws tuaj yeem ua tau zoo yam tsis muaj decomposition, tsis tsim xim nrog ferric chloride, thiab nws cov ntsev yog yooj yim soluble hauv dej. Hauv kev tshawb fawb tshuaj, cov khoom no muaj cov khoom tshwj xeeb xws li molar refractive index, molar volume, thiab isotonic tshwj xeeb ntim. Thiab vim nws cov khoom tshwj xeeb seasoning, nws tuaj yeem siv los ua seasoning hauv kev lag luam khoom noj. Tsis tas li ntawd, nws tseem muaj cov haujlwm lom neeg xws li tshuaj tiv thaiv kab mob thiab tshuaj tua kab mob, uas ua rau nws muaj qee yam kev siv hauv cov tshuaj thiab cov khoom noj qab haus huv. Txawm li cas los xij, qhov xwm txheej tshwj xeeb ntawm daim ntawv thov tseem yuav tsum tau txiav txim siab raws li cov qauv khoom thiab cov txheej txheem yuav tsum tau ua.
Cov ntaub ntawv ntxiv ntawm chemical compound:
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Tshuaj Formula |
C8H8O4 |
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Exact Mass |
168.04 |
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Molecular Luj |
168.15 |
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m/z |
168.04 (100.0%), 169.05 (8.7%) |
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Elemental Analysis |
C, 57.14; H, 4.80; O, 38.06 |
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Melting point |
208-210℃(lit.) |
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Boiling point |
257.07℃(kev kwv yees ntxhib) |
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Qhov ntom |
1.3037 (zeeg) |
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Cia tej yam kev mob |
Khaws hauv qab +30℃. |
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Vanillic acidyog ib qho organic acid dav dav nyob rau hauv cov xwm, nrog rau ntau yam kev ua ub no lom neeg thiab nws kim heev daim ntawv thov nqi. Cov hauv qab no yog cov lus piav qhia ntxaws txog nws lub hom phiaj:
Antioxidant kev ua haujlwm: Cov khoom no muaj cov haujlwm tseem ceeb antioxidant, uas tuaj yeem tshem tawm cov dawb radicals thiab tiv thaiv cov hlwb los ntawm kev puas tsuaj oxidative. Qhov kev ua antioxidant no ua rau nws muaj txiaj ntsig zoo hauv cov khoom noj qab haus huv thiab tshuaj pleev ib ce.
Antibacterial kev ua si: Nws muaj inhibitory cuam tshuam rau ntau yam kab mob thiab fungi, qhia dav -spectrum antibacterial kev ua. Cov tshuaj tua kab mob no ua rau nws siv dav hauv thaj chaw xws li kev khaws zaub mov, tshuaj, thiab tshuaj tua kab.
Anti-inflammatory kev ua: tuaj yeem inhibit inflammatory teb, alleviate cov ntaub so ntswg puas thiab mob. Qhov kev tiv thaiv no -kev ua rau mob ua rau nws muaj peev xwm kho tau hauv thaj chaw xws li tshuaj thiab khoom noj qab haus huv.
Kev tiv thaiv kab mob: Kev tshawb fawb tau pom tias nws muaj kev cuam tshuam rau qee yam kab mob, xws li kab mob khaub thuas. Cov tshuaj tua kab mob no ua rau nws muaj txiaj ntsig zoo rau kev txhim kho cov tshuaj tiv thaiv kab mob.
Kev tiv thaiv kab mob qog noj ntshav: Nws tuaj yeem cuam tshuam kev loj hlob thiab kev sib kis ntawm cov qog nqaij hlav qog noj ntshav los ntawm ntau txoj hauv kev, ua kom pom kev tiv thaiv -mob qog noj ntshav. Qhov kev tiv thaiv no - mob qog noj ntshav ua rau nws muaj peev xwm thov kev cia siab rau hauv kev kho mob qog noj ntshav thiab tiv thaiv.
Cov tshuaj no yog siv dav hauv kev lag luam khoom noj khoom haus raws li ntuj tsim. Nws tuaj yeem txhim kho cov aroma, saj, thiab xim ntawm cov khoom noj thiab dej haus, txhim kho cov khoom zoo thiab cov txiaj ntsig zoo. Nws ua lub luag haujlwm tseem ceeb hauv cov khoom noj xws li khoom qab zib, chocolate, ice cream, dej haus, thiab seasonings. Tsis tas li ntawd, vanillic acid kuj muaj cov nyhuv preservative, uas tuaj yeem ua rau lub neej txee ntawm cov zaub mov. Vim nws muaj ntau yam kev ua ub no xws li tshuaj tua kab mob antioxidant, tshuaj tua kab mob, tshuaj tiv thaiv - mob, thiab tshuaj tiv thaiv kab mob, nws muaj peev xwm siv dav hauv kev kho mob. Nws tuaj yeem siv los ua tus precursor lossis excipient rau kev npaj cov tshuaj nrog cov teebmeem pharmacological.
Tsis tas li ntawd, nws tseem tuaj yeem siv los ua cov khoom siv kho mob ntxiv los txhim kho tib neeg kev tiv thaiv kab mob, tiv thaiv kab mob, thiab txhawb kev noj qab haus huv. Nyob rau tib lub sijhawm, nws muaj cov khoom zoo antioxidant thiab moisturizing, yog li nws tau siv dav hauv kev lag luam tshuaj pleev ib ce. Nws tuaj yeem muab ntxiv ua antioxidant rau cov tshuaj pleev ib ce los tiv thaiv oxidation thiab deterioration ntawm cov khoom xws li roj thiab cov proteins hauv cov tshuaj pleev ib ce. Nyob rau tib lub sijhawm, nws tseem tuaj yeem siv los ua moisturizer los tswj cov tawv nqaij noo noo thiab elasticity.
Cov tshuaj no muaj inhibitory cuam tshuam rau ntau yam nroj tsuag pathogens thiab yog li ntawd yuav siv tau raws li ib tug tshuaj tua kab rau kev tiv thaiv thiab kev tswj ntawm cov nroj tsuag kab mob. Muab piv nrog cov tshuaj tua kab ib txwm muaj, nws muaj qhov zoo ntawm cov tshuaj lom neeg tsawg, kev ua haujlwm siab, thiab kev tiv thaiv ib puag ncig, uas yog ntau dua nyob rau hauv txoj kab nrog kev tsim kho kev ua liaj ua teb niaj hnub no. Nws kuj tseem tuaj yeem siv los npaj cov khoom siv tshuaj xws li txuj lom, dyes, resins, thiab lwm yam. Tsis tas li ntawd, nws yog siv los ua biomarker hauv thaj chaw xws li kev soj ntsuam ib puag ncig thiab kev tshawb fawb ecological toxicology.
Dab tsi yog qhov kev ntsuam xyuas kev nyab xeeb ntawm qhov sib xyaw no?
Vanillic acid, nrog rau cov tshuaj formula C8H8O4 thiab molecular hnyav ntawm 168.15, yog ib tug nruab nrab lub zog organic acid dav pom nyob rau hauv cov xwm, tshwj xeeb tshaj yog nyob rau hauv vanilla extracts. Raws li ib tug phenolic acid, nws muaj nplua nuj aroma thiab ntau yam kev ua si lom, thiab yog li ntawd dav siv nyob rau hauv ntau yam lag luam xws li zaub mov, txuj lom, tshuaj, thiab tshuaj pleev ib ce. Txawm li cas los xij, nrog nws txoj kev siv dav hauv ntau qhov chaw, kev ntsuas kev nyab xeeb ntawm cov khoom no tau dhau los ua qhov tseem ceeb tshwj xeeb. Hauv qab no yog daim ntawv qhia txog kev nyab xeeb rau nws:
Kev cuam tshuam ib puag ncig
Kev ua qias tuaj thaum lub sij hawm tsim khoom
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Thaum nws cov txheej txheem tsim khoom, cov pa phem xws li cov dej khib nyiab, cov pa tawm, thiab cov khib nyiab pov tseg yuav raug tsim tawm. Yog tias cov pa phem no raug tso tawm ncaj qha rau hauv ib puag ncig yam tsis muaj kev kho kom raug, lawv yuav ua rau muaj kuab paug rau hauv dej, huab cua, thiab av. Yog li ntawd, cov tuam txhab tsim khoom lag luam vanilla acid yuav tsum tsim kom muaj suab thaj chaw tiv thaiv ib puag ncig thiab kev tswj hwm kev tswj hwm kom ntseeg tau cov qauv tso tawm ntawm cov pa phem.
Cov pa phem thaum siv
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Kev tuav tsis raug ntawm vanillic acid thaum siv kuj tuaj yeem ua rau muaj kuab paug ib puag ncig. Piv txwv li, hauv kev ua zaub mov, kev sib ntxiv ntau dhau lossis kev tuav tsis raug ntawm cov khoom yuav ua rau muaj kev nce hauv cov zaub mov pov tseg, yog li ua rau lub nra hnyav rau ib puag ncig. Yog li ntawd, cov tuam txhab tsim khoom noj yuav tsum nruj me ntsis tswj nws qhov ntau npaum thiab pov tseg cov khoom noj kom zoo.
Sustainability thiab biodegradability
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Cov tshuaj no, raws li ib tug natural organic compound, muaj ib tug tej yam℃ntawm biodegradability. Txawm li cas los xij, nws tus nqi biodegradation thiab℃yuav cuam tshuam los ntawm ntau yam, xws li ib puag ncig kub, av noo, microbial hom, thiab lwm yam. Yog li ntawd, thaum ntsuas qhov cuam tshuam ib puag ncig, yam xws li sustainability thiab biodegradability yuav tsum tau txiav txim siab tag nrho.
Kev ceev faj rau kev siv
- Ua raws li cov qauv siv: Thaum siv, cov qauv kev siv cuam tshuam thiab kev txwv yuav tsum tau ua raws li nruj me ntsis. Piv txwv li, nyob rau hauv kev lag luam khoom noj khoom haus, nws yuav tsum tau xyuas kom meej tias tus nqi ntawm cov tshuaj ntxiv raws li cov qauv kev nyab xeeb khoom noj khoom haus; Hauv kev siv tshuaj, nws yuav tsum tau ua kom ntseeg tau tias covvanillic acidsiv tau raws li cov qauv zoo thiab kev ruaj ntseg.
- Tsis txhob sib cuag ncaj qha: Thaum tuav thiab siv, sim zam kev sib chwv ncaj qha rau ntawm daim tawv nqaij thiab qhov muag. Yog tias kov tsis tau, yaug tam sim nrog dej kom ntau thiab ntsib kws kho mob. Tsis tas li ntawd, cov khaub ncaws thiab hnab looj tes tiv thaiv tsim nyog yuav tsum hnav kom tsis txhob muaj kev phom sij rau lub cev.
- Kev ceev faj cia: Nws yuav tsum tau muab cia rau hauv qhov chaw txias, qhuav, thiab qhov cua zoo, tsis txhob raug tshav ntuj ncaj qha thiab kub siab. Cov thawv ntim khoom yuav tsum tau muab kaw thiab sau kom meej meej kom tsis txhob xau thiab nkag mus. Tsis tas li ntawd, kev sib khi thiab kev ncaj ncees ntawm cov thawv ntim khoom yuav tsum tau kuaj xyuas kom zoo thiab kev nyab xeeb ntawm oxalic acid.
- Kev soj ntsuam thiab kev sim: Txhawm rau kom ntseeg tau tias nws muaj kev nyab xeeb siv, nws yuav tsum tau saib xyuas thiab kuaj tsis tu ncua. Piv txwv li, hauv kev lag luam khoom noj khoom haus, cov ntsiab lus ntawm cov khoom noj yuav tsum tau kuaj xyuas kom tsis tu ncua kom paub meej tias nws ua tau raws li cov qauv kev nyab xeeb ntawm cov khoom noj; Hauv kev siv tshuaj, kev ntsuas tsis tu ncua yuav tsum tau ua nyob rau hauv cov khoom siv los xyuas kom meej tias ua raws li cov qauv zoo thiab cov kev xav tau ntawm kev nyab xeeb.
Metabolic ntiv tes ntawm cov tshuaj no hauv tib neeg microbiota
Tib neeg microbiota, tshwj xeeb tshaj yog lub plab microbiota, plays lub luag haujlwm tseem ceeb hauv tib neeg kev noj qab haus huv. Lawv koom nrog ntau yam txheej txheem physiological xws li kev zom zaub mov thiab kev nqus cov as-ham, kev tiv thaiv kab mob, thiab kev sib txuas ntawm cov metabolites. Metabolic fingerprinting, raws li ib tug holistic qualitative tsom xam txoj kev rau cov qauv, tuaj yeem txheeb xyuas thiab faib cov kab mob sai sai los ntawm kev sib piv qhov sib txawv hauv spectra yam tsis muaj kev tshuaj xyuas lossis ntsuas cov khoom tshwj xeeb. Vanillin acid, raws li ib tug natural compound pom nyob rau hauv edible nroj tsuag thiab txiv hmab txiv ntoo, tej zaum yuav muaj lub luag hauj lwm tshwj xeeb nyob rau hauv cov txheej txheem metabolic ntawm tib neeg microbiota.
Lub tswv yim ntawm metabolic ntiv tes thiab nws daim ntawv thov hauv kev tshawb fawb microbial
Lub tswvyim ntawm metabolic ntiv tes
Metabolic fingerprinting yog hais txog kev soj ntsuam zoo ntawm microbial metabolites siv cov tswv yim analytical tshwj xeeb, sib piv qhov sib txawv hauv spectra kom paub sai thiab cais cov kab mob. Nws tsis tsom rau cov ntsiab lus thiab cov qauv ntawm cov metabolites tshwj xeeb, tab sis yog nyob rau tag nrho cov yam ntxwv ntawm cov metabolite profile.
Daim ntawv thov hauv Microbial Research
Metabolic fingerprinting technology plays lub luag haujlwm tseem ceeb hauv kev txheeb xyuas cov kab mob microbial, kev faib tawm, thiab kev tshawb fawb ua haujlwm. Piv txwv li, cov txheej txheem metabolic fingerprinting tsim los ntawm BIOLOG hauv Tebchaws Meskas qhia qhov txawv thiab txheeb xyuas cov kab mob raws li lawv qhov sib txawv ntawm kev siv cov pa roj carbon (lossis nitrogen).
Cov kab mob sib txawv siv cov pa roj carbon sib txawv (lossis nitrogen) los nkag rau cov txheej txheem metabolic, thiab lawv tsis tuaj yeem siv lwm cov pa roj carbon (lossis nitrogen). Qhov tshwj xeeb metabolic ntiv tes ntawm txhua tus kab mob yog tsim los ntawm kev teeb tsa thiab sib txuas ua ke ntawm cov pa roj carbon (lossis nitrogen) cov peev txheej, uas tuaj yeem siv los ntawm txhua tus kab mob lossis tsis tuaj yeem siv tau.
Lub luag haujlwm ntawm vanillic acid hauv cov metabolism hauv tib neeg microbiota
Qhov cuam tshuam rau cov qauv ntawm plab microbiota
Vanillin acid tuaj yeem tswj cov qauv ntawm plab hnyuv microbiota los ntawm kev cuam tshuam nws cov haujlwm metabolic. Qee cov kev tshawb fawb tau pom tias vanillic acid muaj cov kab mob tua kab mob thiab tiv thaiv - cov haujlwm ua mob, uas tuaj yeem cuam tshuam kev loj hlob ntawm qee yam kab mob phem thiab txhawb kev tsim cov kab mob zoo. Piv txwv li, vanillic acid tuaj yeem cuam tshuam NF - κ B ua kom muaj zog, txo qhov tsim cov kab mob inflammatory, thiab txhim kho cov kab mob ntawm cov hnyuv, uas yog qhov zoo rau kev ciaj sia thiab colonization ntawm cov kab mob muaj txiaj ntsig. Tsis tas li ntawd, vanillic acid kuj tseem tuaj yeem cuam tshuam cov synthesis ntawm metabolites hauv microbiota, hloov kev sib cuam tshuam ntawm microbiota, thiab yog li cuam tshuam rau cov qauv ntawm plab microbiota.
Koom nrog lwm cov metabolites
Vanillin acid yog ze ze rau lwm cov metabolites hauv cov txheej txheem metabolic ntawm tib neeg microbiota. Nws tuaj yeem ua haujlwm raws li qhov nruab nrab lossis substrate hauv qee txoj hauv kev metabolic, koom nrog hauv metabolic network ntawm microbiota. Piv txwv li, vanillic acid yuav yog ib feem ntawm txoj kev metabolic ntawm qee cov tshuaj tsw qab, muaj feem xyuam rau cov metabolism ntawm cov amino acids xws li phenylalanine thiab tyrosine. Lub caij no, cov metabolites ntawm vanillic acid kuj tseem tuaj yeem cuam tshuam rau kev nce qib ntawm lwm txoj hauv kev metabolic, tsim cov txheej txheem metabolic kev tswj hwm.
Kev hloov pauv hauv microbial metabolic ntiv tes nyob rau hauv cov kab mob tshwj xeeb
Raws li cov kab mob tshwj xeeb, cov ntiv tes metabolic ntawm tib neeg microbiota tuaj yeem hloov pauv, thiab cov metabolism ntawm vanillic acid kuj tseem cuam tshuam. Piv txwv li, nyob rau hauv cov neeg mob uas muaj kab mob metabolic xws li ntshav qab zib thiab rog rog, kev ua haujlwm ntawm cov hnyuv hauv plab tsis zoo, thiab txoj kev metabolic ntawm vanillic acid tuaj yeem hloov pauv, ua rau muaj kev hloov pauv hauv nws cov ntsiab lus hauv lub cev thiab hom metabolites. Los ntawm kev txheeb xyuas cov ntiv tes metabolic ntawm vanillic acid hauv cov kab mob hauv lub xeev, peb tuaj yeem nkag siab qhov txawv txav ntawm cov metabolism hauv microbiota, muab lub hauv paus rau kev kuaj mob thiab kho cov kab mob.
Cov txheej txheem thiab cov txheej txheem rau kev kawm cov ntiv tes ntawm vanillic acid metabolism
Qauv sau thiab pretreatment
Thaum ua cov kev tshawb fawb ntiv tes ntawm vanillic acid metabolism, nws yog thawj zaug uas yuav tsum tau sau cov qauv ntawm tib neeg microbiota, xws li cov qauv fecal. Cov qauv sau tau yuav tsum tau kho ua ntej kom tshem tawm cov impurities thiab cuam tshuam cov khoom. Cov txheej txheem ua ntej ua ntej muaj xws li centrifugation, pom, extraction, thiab lwm yam. Piv txwv li, cov kuab tshuaj organic xws li methanol, ethanol, thiab lwm yam tuaj yeem siv los rho tawm vanillic acid thiab lwm yam metabolites los ntawm cov qauv fecal.
Cov txheej txheem analytical
Tam sim no, feem ntau siv ntiv tes tsom xam cov tswv yim rau vanillic acid metabolism muaj xws li nuclear magnetic resonance technology, huab hwm coj spectrometry technology, thiab lwm yam. Nuclear magnetic resonance technology tuaj yeem ua tau zoo thiab ntau qhov kev tshuaj xyuas ntawm cov metabolites hauv cov qauv. Los ntawm kev txheeb xyuas cov tshuaj hloov pauv thiab sib txuas tas li ntawm hydrogen lossis carbon atoms hauv cov metabolites, cov qauv ntawm cov metabolites tuaj yeem txiav txim siab. Mass spectrometry thev naus laus zis tuaj yeem txiav txim siab qhov hnyav molecular thiab cov ntaub ntawv tawg ntawm cov metabolites, ntxiv kev lees paub lawv tus kheej. Tsis tas li ntawd, nuclear magnetic resonance thev naus laus zis thiab huab hwm coj spectrometry thev naus laus zis tuaj yeem ua ke los txhim kho qhov tseeb thiab rhiab heev ntawm kev tsom xam.
Kev ua cov ntaub ntawv thiab kev txheeb xyuas
Cov ntaub ntawv tau los ntawm kev txheeb xyuas yuav tsum tau ua tiav thiab tshuaj xyuas kom tshem tawm cov ntaub ntawv metabolic ntiv tes ntawm vanillic acid. Cov txheej txheem kev ua cov ntaub ntawv muaj xws li ncov ncov, ncov kev sib raug zoo, normalization, thiab lwm yam. Los ntawm kev muab piv rau thaj tsam ncov thiab qhov siab ntawm vanillic acid metabolites hauv cov qauv sib txawv, cov ntiv tes metabolic ntawm vanillic acid tuaj yeem tau. Tom qab ntawd, cov txheej txheem kev txheeb xyuas ntau yam sib txawv (xws li kev tsom xam cov ntsiab lus tseem ceeb, kev txheeb xyuas pawg, thiab lwm yam) tuaj yeem siv los txheeb xyuas cov ntiv tes metabolic thiab txheeb xyuas qhov sib txawv thiab zoo sib xws ntawm cov qauv sib txawv.
Cov lus nug nquag
Raws li cov kua qaub, vim li cas nws cov ntawv thov tseem ceeb tsis yog nyob ntawm acidity, tab sis ntawm nws cov khoom "phenolic"?
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Nws acidity (pKa ≈ 4.3) kuj tsis muaj zog ntawm cov organic acids. Nws cov txiaj ntsig tseem ceeb yog nyob rau hauv lub peev xwm antioxidant muaj peev xwm los ntawm phenolic hydroxyl pawg (los ntawm kev muab cov hydrogen atoms rau neutralize dawb radicals), nrog rau nws lub luag hauj lwm raws li ib tug tseem ceeb hluavtaws intermediate rau ntau yam khoom ntuj tsim.
Yuav ua li cas thiaj li dhau qhov kev ua haujlwm ntawm cov tshuaj tua kab mob (xws li malic acid) hauv kev khaws zaub mov?
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Nws plays lub luag hauj lwm ntawm "ntau yam": 1) antioxidant, tiv thaiv cov roj spoilage; 2) Inhibit ntau yam kab mob; 3) Nws yog ib qho ntuj tsim ntawm ntau yam txuj lom, nrog rau kev sib haum xeeb ntau dua. Nws tau ua tiav ntau yam los ntawm kev tiv thaiv -corrosion, kev ruaj ntseg zoo rau kev khaws cov tshuaj tsw qab.
Yuav ua li cas qhia tau hais tias muaj peev xwm tiv thaiv nyob rau hauv lub teb ntawm neuroscience?
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Cov kev tshawb fawb hauv tsev kho mob tau pom tias nws tuaj yeem nkag mus rau hauv cov ntshav- lub paj hlwb teeb meem, txo qis neuroinflammation los ntawm inhibiting kev ua kom ntau dhau ntawm microglia thiab txo qhov tso tawm ntawm pro-inflammatory cytokines, uas yuav muaj kev cuam tshuam zoo rau cov kab mob neurodegenerative xws li Alzheimer's disease thiab Parkinson's disease.
Vim li cas nws yog tus choj tseem ceeb rau kev sib txuas "vanillin" thiab "ethyl vanillin", tab sis tsis dav siv los ua tshuaj tsw qab?
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Vim tias nws cov aroma (tsis muaj zog vanilla nrog cov ntawv sau phenolic) tsis tshua muaj siab, ntshiab, thiab qab ntxiag dua li vanillin muab los ntawm nws. Kev lag luam tshuaj ua kom zoo dua nws cov khoom olfactory los ntawm methylating lossis ethylating nws, ua rau nws tsis tuaj yeem hloov "precursor" rau cov txuj lom sab saum toj.
Nws ua lub luag haujlwm dab tsi hauv kev sib cuam tshuam ntawm allelopathic ntawm cov nroj tsuag thiab cov kab mob?
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Nws yog ib qho tseem ceeb "xov xwm molecule" secreted los ntawm cov hauv paus hniav. Ntawm qhov tsis tshua muaj siab, nws tuaj yeem ua cov pa roj carbon monoxide los txhawb kev loj hlob ntawm qee yam kab mob symbiotic; Nyob rau hauv high concentrations, nws muaj peev xwm inhibit noob germination thiab paus kev loj hlob ntawm ib puag ncig sib tw nroj tsuag, pab cov niam txiv cov nroj tsuag sib tw rau ciaj sia taus kev pab.
Cim npe nrov: vanillic acid cas 121-34-6, lwm tus neeg, manufacturers, hoobkas, lag luam wholesale, yuav, nqe, tej, kev muag khoom