Tannins

Cov txheej txheem:

Video: Tannins

Video: Tannins
Video: What are Tannins? 2024, Kaum ib hlis
Tannins
Tannins
Anonim

Tannins, tseem hu ua tannins, yog polymeric phenolic tebchaw uas feem ntau cov nroj tsuag.

Tannins feem ntau nthuav tawm hauv cov tawv ntoo ntawm cov ntoo, tab sis kuj pom muaj nyob hauv cov hauv paus hniav, nplooj thiab cov kab ntawm cov nroj tsuag muaj nroj.

Hom ntawm tannins

Hydrolyzable tannins - nyob rau hauv cov cawv ntawm cov kua qaub, lawv tau hydrolyzed rau cov sib txuas yooj yim xws li ellagic thiab gallic acid. Ua raws li qhov no, lawv muab faib ua elagotanins thiab gallotannins.

Muaj txim tannins - cov no yog cov polymers ntawm catechins. Pab pawg no suav nrog cov txiv hmab txiv ntoo ntawm bilberry, Oak xyoob ntoo, rhizome ntawm ochibolets.

Npauj npaim tuaj
Npauj npaim tuaj

Cov khoom siv ntawm tannins

Liab liab yog ib yam ntawm cov loj tshaj plaws ntawm tanninsCov. Tannins kuj tseem pom muaj nyob hauv cov cinnamon, cumin, oregano, vanilla, taum liab, taum dub, rosehip tshuaj yej, guarana, npias. Txiv hmab txiv ntoo uas muaj nplua nuj nyob hauv tannins yog txiv ntoo qab zib, nectarines, apricots, blueberries, pomegranates, txiv pos nphuab.

Kev siv cov tannins

Sijhawm dhau los, tannins tau raug siv los ua cov pov thawj tshuaj. Tam sim no lawv tau siv los ua cov khoom noj xim. Lawv muaj xim daj, xim nruj heev. Lawv yog cov soluble hauv dej, glycerin thiab cawv. Lawv tau cim los ntawm cov muaj zog acidic thiab zwm rau hauv pawg phenolic. Lawv siv rau hauv kev ua cawv.

Hauv kev lag luam khoom noj khoom haus, tannins yog E181 ntxiv. Cov lus qhia ntxiv no yog tsim los ntawm cov khoom cog. Ua tsaug rau nws, daim ntawv cog lus muaj zog heev yog tsim nrog polysaccharides thiab ntau yam biopolymers. Qhov zas yog siv rau hauv kev lag luam textile thiab rau cov khoom lag luam tawv.

Cov neeg tsis paub tab ntau yuav tsum tau ceev faj txog kev siv E181. Cov tshuaj yuav ua rau mob hnyav heev ntawm txoj hnyuv thiab lub raum, mob siab thiab qeeb metabolism hauv cov vitamins. Tsis tau teev tus nqi siab tshaj plaws tanninsuas tuaj yeem siv tau nyob hauv ib hnub.

Caw
Caw

Tannins hauv cawv liab

Tannins yog cov khoom xyaw uas tsim cov kev xav tshwj xeeb ntawm dryness uas liab caw cov nplooj tawm hauv lub qhov ncauj. Ntawm qhov tod tes, hauv cov cawv txiv ntoo qis qis lawv yog vim li cas rau cov yam ntxwv tsis zoo xws li kev iab thiab tawv.

Txawm li cas los xij, tannins yog qhov tsim nyog tiag tiag hauv winemaking, vim tias tsis muaj lawv cov cawv liab yuav plam lawv cov qauv zoo nkauj thiab lub peev xwm yuav tau khaws cia ntev.

Tannins tsim cov cawv liab thiab muaj peev xwm txawm hais tias muaj tib lub luag haujlwm uas tib neeg lub cev pob txha caj qaum txhawb nqa lub cev. Tag nrho cov khoom muaj txiaj ntsig ntawm cawv yog vim muaj tannins hauv nws.

Tannins txo cov oxidation ntawm caw - nws cov yeeb ncuab tseem ceeb. Nws tuaj yeem hais tias kev tswj hwm ntawm tannins yog ib qho nyuaj tshaj plaws thiab tib lub sijhawm ua cov haujlwm tseem ceeb ntawm winemakers. Cov txiv hmap liab muaj qhov zoo tshaj plaws ntawm cov tannins.

Cov txiaj ntsig ntawm tannins

Tannins feem ntau yog siv los ua astringents vim tias lawv muaj cov nyhuv ua rau ntshav thiab cov leeg. Ntawm txheej sab nraud ntawm daim tawv nqaij, lawv tsim daim coagulation membrane, uas tiv thaiv cov ntaub so ntswg thiab cov leeg kawg los ntawm kev ua pa los ntawm ntau tus neeg sawv cev.

Tsaug rau tannins cov txheej txheem mob hauv lub qhov ncauj, lub plab zom mov, cov tawv nqaij ua kom mob sai dua, thiab cov mucosa tsis xau tshuaj lom cov quav. Tannins muaj txiaj ntsig zoo ua rau raws plab. Lawv yog cov tshuaj antioxidant zoo heev.

Kev phom sij los ntawm tannins

Tannins tseem muaj qee qhov tsis zoo thiab. Lawv tsis tshua tsim nyog rau cov neeg uas muaj lub zog rhiab rau caffeine, zoo li nws tuaj yeem ua rau tshee, txob taus, ntxhov siab thiab txawm tias lub siab ntxhov siab cuam tshuam.

Qhov tsis zoo thib ob qhov tsis zoo ntawm cov tannins yog tias ua ib feem ntawm tsev neeg loj ntawm polyphenols, lawv txo lub cev kev muaj peev xwm nqus cov hlau los ntawm cov khoom noj.

Hauv kev noj qab haus huv zoo qhov no yuav tsum tsis yog kev txhawj xeeb, tab sis nyob rau hauv kev noj zaub mov tsis zoo thiab tsis muaj kab mob hauv lub cev, ntau ntau tannins qis dua hlau theem hauv lub cev. Qhov no ua rau muaj kev tiv thaiv tsis muaj zog, qaug zog, poob ntawm cov plaub hau thiab ntau dua.

Pom zoo: