Nrog kev pom zoo ntawm Stevia hauv Tebchaws Meskas, cov neeg siv khoom qab zib loj, nws qhov kev thov yuav loj hlob ntawm tus nqi ntawm 30 feem pua ntawm ib xyoos.Stevia Extract hmoovyog lub ntuj tsim, siv zog, qis-calorie sweetener muab rho tawm thiab ua kom zoo los ntawm nplooj thiab rhizomes. Nws yog tsim los ntawm ob yam, Stevioside (ST) thiab Rebaudioside A (RA). RA yog ib qho zoo tagnrho hloov rau sucrose. Hauv qab no yog cov ntsiab lus ntawm yuav ua li cas stevia extract ua.
Yuav Ua Li Cas Stevia Extract?
Cov txheej txheem kev npaj ntawm Stevia feem ntau yog raws li nram no: ziab thiab crushing nplooj → kua theem extraction → impurity tshem tawm → resin kho → tshuaj tsuag kom qhuav thiab refining. Nov yog cov ntsiab lus ntawm cov kauj ruam tseem ceeb:
1. Kev rho tawm:
Cov ntsiab lus ntawm ST thiab RA nyob rau hauv cov nplooj stevia thaum ntxov bud yog siab tshaj. Tom qab ziab thiab pulverizing cov nplooj stevia nyob rau lub sijhawm no, stevia qab zib feem ntau yog muab rho tawm hauv cov kua theem nrog cov kuab tshuaj zoo li dej kub lossis cawv. Txoj kev extraction feem ntau yog muab faib ua tank batch extraction lossis countercurrent nruam extraction.
2. Kev rho tawm thiab ua kom huv:
Stevia stock tov muaj ntau impurities xws li protein, organic acid, tannin, saponin, pigment, inorganic ntsev thiab hais txog. Cov ntsiab lus ntawm cov impurities no yog 5-7 npaug ntawm glycosides. Kem chromatography lossis membrane filtration feem ntau yog siv los cais thiab purify los ntawm cov tshuaj stevia.
3. Resin Treatment
Thaum siv cov membrane filtration los cais thiab purify, Stevia tuaj yeem raug tshem tawm los ntawm kev pom los ntawm ceramic micropores, ultrafiltration membranes, thiab nanofiltration membranes.
Ionic tebchaw nyob rau hauv cov kua thiab cov organic molecules uas nws cov luj molecular yog heev txawv ntawm cov stevia. Cov tshuaj stevia-enriched yog tau.
4. Txau kom qhuav:
Cov kua concentrated tuaj yeem tau txais los ntawm kev ua kom txias crystallization, tsom mus rau crystallization lossis tshuaj tsuag kom qhuav kom tau cov stevia crude uas nws cov khoom tseem ceeb yog ST thiab RA. Cov khoom yog xim tsaus. Nws tuaj yeem decolorized nrog cov pa roj carbon activated ua ntej crystallization lossis txau kom qhuav kom muab cov khoom dawb. Feem ntau stevia extract manufacturers tsim cov khoom zoo li no.
5. Refined:
Lub solubility ntawm ST thiab RA nyob rau hauv hydrophilic solvents yog txawv. Txhawm rau kom ua tiav qhov saturated concentration, crude stevioside tau yaj hauv methanol, ethanol, thiab lwm yam kuab tshuaj. Tom qab ntawd, ST los yog RA crystals yog xaiv los ntawm txoj kev xws li concentration thiab txias. Txhawm rau kom ntseeg tau tias cov khoom siv purity RA tuaj yeem tau txais, cov khoom siv lead ua tuaj yeem rov ua dua hauv ethanol aqueous tov kom tshem tawm cov impurities insoluble, thiab cov khoom tuaj yeem tau los ntawm cov tshuaj tsuag kom qhuav los yog concentrated crystallization.
Cov ntsiab lus
Stevia yog raws li niaj hnub no lub tswv yim noj ntawm "natural, ntsuab, nyab xeeb, thiab noj qab nyob zoo". Tam sim no, kev nqis peev hauv Stevia los ntawm lub ntiaj teb sab saum toj 500 tuam txhab xws li Coca-Cola, Cargill, thiab PepsiCo ntawm lub ntiaj teb no yuav txhawb kev loj hlob ntawm kev lag luam stevia. Raws li qhov zoo tshaj plaws hloov pauv rau sucrose,Stevia Extract hmoovr yuav raug lees paub ntxiv los ntawm kev ua lag luam.