Covdaim tawv nqaij ntawm liab grapesyog ib qho nyuaj ntawm cov nroj tsuag-raws li cov tebchaw, uas yog cov xim, cov qauv polyphenolic, cov kua qaub, thiab cov qauv carbohydrates uas txhais tau hais tias cov tshuaj lom neeg thiab kev lag luam tsim nyog.
Nkag siab txog Kev Tsim Nyog ntawm Red Grape Skins
Cov tawv nqaij ntawm cov txiv hmab txiv ntoo liab tsis yog tsuas yog cov txheej tiv thaiv sab nrauv ntawm cov txiv hmab txiv ntoo, tab sis nws cov ntsiab lus ntawm qhov tshwm sim ntawm cov molecules uas cuam tshuam rau cov xim, kev coj cwj pwm, thiab kev ua haujlwm ntawm qhov tseem ceeb rau cov tuam txhab. Hauv kev lag luam siv cov tawv txiv hmab txiv ntoo liab, piv txwv li, hauv cov khoom siv thiab kev tsim kho, kev nkag siab txog cov khoom ntawm cov tawv txiv hmab txiv ntoo liab yuav pab cov neeg tsim khoom hauv kev txiav txim siab lawv cov phiaj xwm zoo tshaj plaws, cov xim zoo nkauj, thiab kwv yees cov khoom sib txawv. Cov tawv nqaij liab liab hauv cov ntsiab lus no tshwj xeeb yog siv los txhais cov epidermal thiab sub- cov ntaub so ntswg epidermal ntawm Vitis vinifera thiab lwm yam cultivars uas yog lub hauv paus ntawm kev hnov lus thiab cov yam ntxwv ntawm kev rho tawm.
Pigments thiab Colour-Defining Molecules
Anthocyanin Pigments
Anthocyanin pigments, ib tsev neeg ntawm dej-soluble flavonoids, muaj ntau nyob rau hauv daim tawv nqaij liab liab thiab muab cov tawv nqaij liab, ntshav, thiab xiav xim, nyob ntawm seb pH. Cov khoom pom kev uas tau siv nyob rau hauv daim ntawv thov ntuj xim yog ntaus nqi rau cov pigments. Tus cwj pwm ntawm anthocyanins uas cov neeg tsim khoom txaus siab yog lawv lub peev xwm xa cov duab xav tau thaum siv rau hauv kev tsim khoom noj, dej haus, thiab cov xim zoo nkauj.
Copigments thiab Stabilizing Compounds
Nrog rau cov anthocyanins loj, muaj cov xim ntawm cov tawv nqaij liab, nrog rau flavononls thiab phenolic acids. Cov no yog cov tebchaw thib ob uas cuam tshuam nrog anthocyanins thiab cuam tshuam rau kev ruaj ntseg thiab kev qhia ntawm cov xim hauv kev ua haujlwm. Lawv cov kwv tij txheeb ze tuaj yeem siv los ua cov pab pawg ua haujlwm hloov kho lawv cov kev rho tawm thiab kev sib xyaw ua ke los tsim cov txiaj ntsig zoo sib xws.
Phenolic Structures thiab Molecular Diversity
Flavonoid cov ntsiab lus
Ntxiv nrog rau cov xim, cov tawv nqaij liab muaj ntau yam ntawm cov qauv flavonoid xws li quercetin, catechins, thiab lwm yam. Cov molecules no tau ntxiv rau tag nrho cov duab polyphenolic, uas siv rau kev rho tawm tawm, chromatographic profiling, thiab standardization ntawm grape tawv nqaij - muab cov khoom xyaw.
Tannins thiab Polymerized Phenolics
Cov tawv txiv hmab txiv ntoo liab muaj tannins, ib hom loj dua polyphenolic qauv, uas cuam tshuam rau kev zoo nkauj zoo nkauj xws li astringency. Txawm hais tias lawv tsis yog ua haujlwm ncaj qha los tsim cov xim, lawv lub xub ntiag tuaj yeem hloov pauv tag nrho cov ntsiab lus ntawm cov extract, thiab lawv yuav tsum tau ua kom huv lossis hloov kho thaum cov extract tau muab rho tawm kom ua tiav cov ciaj ciam zoo.
Organic Acids thiab pH-Influencing Components
Malic thiab Tartaric Acids
Cov tawv txiv hmab txiv ntoo liab kuj muaj cov organic acids xws li malic lossis tartaric acid, uas ntxiv rau cov acidity profile ntawm raw cov ntaub ntawv. Cov kua qaub no muaj peev xwm hloov kho pH ntawm cov khoom siv tawm thiab ua tiav cov txheej txheem hauv kev tsim kho, uas tom qab ntawd cuam tshuam cov xim ntawm cov xim thiab solubility.
Lwm cov ntsiab lus acidic
Lwm cov organic acids me hauv cov tawv nqaij liab muaj xws li citric acid. Txawm hais tias lawv tsis yog cov khoom xyaw tseem ceeb ntawm kev txaus siab rau kev tsim cov xim, qhov kev txaus siab ntawm cov molecules no tso cai rau kev tswj cov txheej txheem, tshwj xeeb tshaj yog nyob rau hauv pH- cov txheej txheem rho tawm thiab stabilization.
Cov qauv Carbohydrates thiab Cell phab ntsa Cheebtsam
Pectin thiab Hemicellulose
Cov qauv carbohydrate (pectin thiab hemicellulose) yog cov khoom xyaw ntawm cell phab ntsa matrix uas tuaj yeem pom hauv daim tawv nqaij liab. Cov polysaccharides no muaj peev xwm cuam tshuam cov viscosity ntawm cov kua rho tawm thiab cuam tshuam rau kev pom, kev nthuav dav, thiab kev tsim khoom ntau.
Cellulose thiab Insoluble Fibers
Nyob rau hauv cov residual solids tom qab extraction, muaj cov insoluble fibers xws li cellulose. Kev nkag siab txog cov ntsiab lus fiber ntau tuaj yeem pab cov neeg ua haujlwm hauv kev tsim cov tswv yim sib cais thiab ziab thiab tseem tuaj yeem pab txheeb xyuas los ntawm - cov khoom ntws txhawm rau txhawm rau ntsuas lawv.
Cov khoom me me cuam tshuam rau kev rho tawm thiab ua tiav
Trace Minerals
Potassium, calcium, thiab magnesium kuj muaj nyob rau hauv cov txiv hmab txiv ntoo liab. Cov ions no tuaj yeem hnov mob nrog cov xim thiab cov kua qaub, txawm hais tias nyob rau hauv qhov tsis tshua muaj siab, lawv tuaj yeem cuam tshuam rau cov xim qhia thiab rho tawm kinetics. Kev paub txog cov ntsiab lus ntxhia muab kev paub txog dej zoo thiab kev ntsuas chelation hauv kev tsim khoom.
Volatile compounds
Cov tawv nqaij ntawm cov txiv hmab txiv ntoo liab kuj yog qhov chaw ntawm cov tshuaj tsis haum tshuaj uas siv los tsim cov aroma hauv cov khoom noj thiab dej haus. Txawm hais tias cov volatiles no tsis yog qhov tseem ceeb hauv kev siv cov xim muaj xim, lawv tuaj yeem ua rau muaj kev cuam tshuam rau kev hnov lus ntawm co-cov khoom lossis cov khoom siv ntau yam.
Xaus
Cov tawv nqaij liab liab muaj cov qauv tshuaj lom neeg uas muaj cov xim xws li anthocyanins, copigments, ntau cov qauv polyphenolic, cov organic acids, cov qauv carbohydrate, thiab cov khoom me. Qhov kev paub ntawm cov khoom no yuav pab cov neeg tsim khoom thiab cov tsim khoom tsim kom muaj txiaj ntsig zoo tshaj plaws, tswj cov xim zoo, thiab sib xyaw cov ntaub ntawv ntawm cov tawv nqaij ua tiav rau hauv cov txheej txheem kev lag luam. Cov ntaub ntawv hais txog cov txiv hmab txiv ntoo liab siv los txiav txim siab txog kev ua haujlwm, kev tswj pH, thiab kev cia siab ntawm cov khoom lag luam yog siv rau cov ntawv thov uas nyob ntawm cov nroj tsuag - muab cov khoom nkag.
Koj puas muaj kev xav txawv? Los yog xav tau qee cov qauv thiab kev txhawb nqa? Tsuas yogTso Ib Lusntawm nplooj ntawv no los yogTiv tauj peb ncaj qha kom tau txais cov qauv dawb thiab kev txhawb nqa kev tshaj lij!
FAQ
Q1: Dab tsi yog qhov tseem ceeb ntawm cov xim-txhais xim hauv cov tawv txiv hmab txiv ntoo liab?
A1: Anthocyanin pigments thiab copigments zoo li flavonols yog cov xim loj -txhais cov tebchaw hauv cov tawv nqaij liab thiab txiav txim siab xim thiab kev ruaj ntseg hauv cov xim xim.
Q2: Yuav ua li cas muaj pes tsawg leeg ntawm cov txiv hmab txiv ntoo liab cuam tshuam cov txheej txheem rho tawm?
A2: Kev sib xyaw ntawm cov xim, cov kua qaub, thiab cov qauv carbohydrates hauv cov tawv nqaij ntawm cov xim liab cuam tshuam rau kev xaiv cov kuab tshuaj, pH equilibrium, thiab cov txheej txheem sib cais ntawm cov extract, uas ua rau cov txheej txheem optimization yog qhov tseem ceeb ntawm cov txiaj ntsig zoo.
Q3: Vim li cas cov organic acids hauv cov tawv txiv hmab txiv ntoo liab tseem ceeb rau cov neeg tsim khoom?
A3: Organic acids xws li malic thiab tartaric acids tuaj yeem hloov pH ntawm cov extracts thiab cov tshuab tiav, uas tom qab ntawd tuaj yeem hloov xim thiab solubility ntawm pigments, thiab pH tswj yog qhov tseem ceeb rau kev xav.
Q4: Cov txheej txheem ntawm cov tawv nqaij liab tuaj yeem cuam tshuam rau kev ua haujlwm hauv qab?
A4: Cov ntsiab lus hauv cov qauv, xws li pectin thiab cellulose cuam tshuam cov viscosity thiab filtration cwj pwm, yuav tsum muaj kev hloov kho hauv cov txheej txheem kom meej thiab ziab.
Cov ntaub ntawv
1. Gonzalez-Paramas, AM, et al. (2021). Polyphenolic tus cwj pwm ntawm cov tawv nqaij los ntawm ntau yam Vitis vinifera: Qhov cuam tshuam rau kev tshem tawm xim xim. Phau ntawv Journal of Agricultural thiab Food Chemistry, 69(15), 4450–4462.
2. Ruiz-Moran, L., & Garcia-Rodriguez, R. (2020). Kev cuam tshuam ntawm cov organic acids ntawm anthocyanin stability thaum ua cov txiv hmab txiv ntoo ntawm daim tawv nqaij. Food Chemistry, 310, 125930.
3. Lee, J., & Finn, CE (2022). Cell phab ntsa muaj pes tsawg leeg thiab nws lub luag hauj lwm nyob rau hauv cov nroj tsuag extract processing: Cov ntaub ntawv kawm nrog liab grapes. Phau ntawv Journal of Plant Physiology, 273, 153732.
4. Martelo-Villalonga, J., et al. (2023). Kev sib cuam tshuam ntawm flavonoids thiab copigments nyob rau hauv cov txiv hmab txiv ntoo extracts: Mechanistic insights for formulation science. Food Research International, 160, 112066.
