Xanthan gum, tseem hu ua xanthan gum, yog siv dav siv microbial extracellular polysaccharide ua los ntawm * Xanthomonas campestris * los ntawm fermentation engineering siv carbohydrates ua cov khoom siv tseem ceeb (xws li pob kws hmoov txhuv nplej siab). Nws muaj cov khoom tshwj xeeb rheological, dej solubility zoo, ruaj khov rau cov cua sov thiab acids / alkali, thiab zoo heev compatibility nrog ntau yam ntsev. Raws li cov thickener, suspending agent, emulsifier, thiab stabilizer, nws yog dav siv nyob rau hauv ntau tshaj 20 industries, nrog rau cov zaub mov, roj av, thiab tshuaj. Tam sim no nws yog lub ntiaj teb loj tshaj plaws - nplai tsim thiab feem ntau siv microbial polysaccharide.
Xanthan gum, tseem hu ua xanthan cov pos hniav los yog xanthan cov pos hniav, yog ib tug extracellular acidic heteropolysaccharide tsim los ntawm fermentation ntawm * Xanthomonas campestris *. Nws yog ib qho siab -molecular- hnyav polysaccharide compound tsim los ntawm D-glucose, D-mannose, thiab D-glucuronic acid nyob rau hauv ib qho piv txwv 2: 2: 1, nrog cov txheeb ze molecular loj tshaj 1 lab. Xanthan cov pos hniav cov txheej txheem thib ob muaj cov saw hlau sab uas qhwv los tiv thaiv - tig ib ncig ntawm cov saw hlau tseem ceeb, tuav tus pas nrig- zoo li ob chav helix qauv los ntawm hydrogen bonds.
Khoom Parameters thiab kev siv
Kuj tseem hu ua xanthan cov pos hniav. Daim ntawv thov muaj xws li thickeners, suspending agents, thiab lwm yam.
Daim Ntawv Thov Kev Lag Luam: Khoom noj khoom haus, roj av, tshuaj, thiab lwm yam.
Xanthan cov pos hniav tam sim no yog lub ntiaj teb zoo tshaj bio- cov pos hniav, sib txuas cov thickening, suspending, emulsifying, thiab stabilizing zog. Tus nqi ntawm pyruvate pawg ntawm qhov kawg ntawm xanthan cov pos hniav molecular sab chains cuam tshuam rau nws cov kev ua tau zoo. Xanthan cov pos hniav muaj cov khoom siv dav dav ntawm cov khoom siv ntev ntev - chain polymers, tab sis nws muaj cov pab pawg ua haujlwm ntau dua li cov khoom siv polymers, nthuav tawm cov khoom tshwj xeeb hauv cov xwm txheej tshwj xeeb.
Nws conformation nyob rau hauv aqueous daws yog ntau haiv neeg, displaying txawv cov yam ntxwv nyob rau hauv txawv tej yam kev mob.
- Suspension thiab Emulsification Properties: Xanthan cov pos hniav muaj cov khoom zoo tshaj plaws rau cov khoom tsis zoo thiab cov tee roj. Xanthan gum sol molecules tuaj yeem tsim super-bound, ribbon-zoo li helical copolymer, ua rau tsis yooj yim, gel-zoo li cov qauv hauv network, yog li txhawb cov qauv ntawm cov khoom sib txuas, cov tee, thiab npuas, nthuav tawm muaj zog emulsifying thiab stabilization siab.
- Dej Solubility zoo heev: Xanthan cov pos hniav dissolves sai sai hauv dej, nthuav tawm cov dej solubility zoo heev. Nws dissolves txawm nyob rau hauv dej txias, tshem tawm qhov xav tau rau kev ua haujlwm nyuaj thiab ua rau nws yooj yim rau siv. Txawm li cas los xij, vim nws muaj zog hydrophilicity, yog ntxiv ncaj qha rau hauv dej yam tsis muaj kev nplawm txaus, cov txheej txheej sab nrauv yuav nqus dej thiab o mus rau hauv gel-zoo li huab hwm coj, tiv thaiv dej los ntawm kev nkag mus rau hauv txheej sab hauv thiab cuam tshuam rau nws cov txiaj ntsig. Yog li ntawd, kev siv kom zoo yog qhov tseem ceeb. Xanthan pos hniav hmoov, los yog sib tov ntawm xanthan pos hniav hmoov thiab qhuav hmoov additives xws li ntsev los yog qab zib, yuav tsum tau maj mam ntxiv rau dej thaum stirring los tsim ib tug tov.
- Thickening Properties: Xanthan cov pos hniav muaj cov yam ntxwv ntawm cov viscosity siab ntawm qhov tsis tshua muaj siab (1% aqueous tov muaj viscosity sib npaug rau 100 npaug ntawm gelatin), ua rau nws muaj txiaj ntsig zoo.
Vim Li Cas Xaiv Peb
Peb muab thawj- khoom siv tes; lav kev sib tw nqi thiab zoo. Peb tuaj yeem npaj cov khoom xa tuaj rau tib hnub tom qab kev txiav txim muab tso rau, ua kom cov khoom zoo thiab kev xa khoom ruaj khov, tso cai rau kev sib koom ua ke muaj txiaj ntsig zoo.
