Theaflavins (TFs)thiabThearubigins (TRs)yog ob pawg sib txawv ntawm cov tshuaj polyphenolic muaj nyob hauv cov tshuaj yej dub, txhua tus muaj cov tshuaj lom neeg tshwj xeeb thiab cov khoom. Nkag siab txog qhov sib txawv ntawm cov tebchaw no yog qhov tseem ceeb rau kev nkag siab txog lawv tus kheej kev koom tes rau cov yam ntxwv thiab kev noj qab haus huv ntawm cov tshuaj yej dub. Tsab ntawv xov xwm no yog npaj los muab kev tshawb fawb txog kev tsis sib xws ntawm Theaflavins thiab Thearubigins, txhawb nqa los ntawm cov pov thawj los ntawm cov kev tshawb fawb ntsig txog.
Theaflavins thiab thearubigins yog ob qho tib si flavonoids uas ua rau cov xim, tsw, thiab lub cev ntawm tshuaj yej.Theaflavins yog txiv kab ntxwv lossis liab, thiab thearubigins yog xim liab-xim av. Theaflavins yog thawj flavonoids tshwm sim thaum oxidation, thaum thearubigins tshwm sim tom qab. Theaflavins pab txhawb rau cov tshuaj yej astringency, brightness, thiab briskness, thaum thearubigins pab txhawb rau nws lub zog thiab lub qhov ncauj-xav.
Theaflavins yog ib chav kawm ntawm cov tshuaj polyphenolic uas ua rau cov xim, tsw, thiab kev noj qab haus huv ntawm cov tshuaj yej dub. Lawv raug tsim los ntawm oxidative dimerization ntawm catechins thaum lub sij hawm fermentation txheej txheem ntawm tshuaj yej nplooj. Theaflavins paub txog lawv cov tshuaj tiv thaiv kab mob antioxidant thiab tiv thaiv kab mob, uas tau txuas rau ntau yam txiaj ntsig kev noj qab haus huv, suav nrog kev tiv thaiv kab mob plawv, tiv thaiv qog noj ntshav, thiab muaj peev xwm tiv thaiv kev laus.
Ntawm qhov tod tes,Thearubiginsyog cov loj polyphenolic tebchaw uas tseem tau los ntawm oxidation ntawm tshuaj yej polyphenols thaum lub sij hawm fermentation ntawm tshuaj yej nplooj. Lawv muaj lub luag haujlwm rau cov xim liab nplua nuj thiab cov yam ntxwv tsw ntawm cov tshuaj yej dub. Thearubigins tau cuam tshuam nrog antioxidant, tiv thaiv kab mob, thiab tiv thaiv tawv nqaij, ua rau lawv muaj kev txaus siab rau kev tiv thaiv kev laus thiab kev tu tawv nqaij.
Chemically, Theaflavins txawv ntawm Thearubigins raws li lawv cov qauv molecular thiab muaj pes tsawg leeg. Theaflavins yog dimeric compounds, lub ntsiab lus ntawm kev sib xyaw ua ke ntawm ob chav me me ua rau lawv, thaum Thearubigins yog cov khoom siv polymeric loj dua los ntawm polymerization ntawm ntau yam flavonoids thaum lub sij hawm tshuaj yej fermentation. Qhov kev sib txawv ntawm cov qauv no txhawb nqa lawv cov haujlwm lom neeg sib txawv thiab muaj peev xwm cuam tshuam txog kev noj qab haus huv.
| Theaflavins | Thearubigins | |
| Xim | Txiv kab ntxwv los yog liab | Liab-xim av |
| Kev koom tes rau tshuaj yej | Astringency, brightness, thiab briskness | Lub zog thiab qhov ncauj-xav |
| Cov qauv tshuaj | Zoo txhais | Heterogeneous thiab tsis paub |
| Feem pua ntawm qhov hnyav qhuav hauv cov tshuaj yej dub | 1-6% | 10-20% |
Theaflavins yog cov pab pawg tseem ceeb ntawm cov tshuaj siv los ntsuas qhov zoo ntawm cov tshuaj yej dub. Qhov piv ntawm theaflavins rau thearubigins (TF: TR) yuav tsum yog 1:10 txog 1:12 rau cov tshuaj yej dub zoo. Lub sij hawm fermentation yog qhov tseem ceeb hauv kev tswj hwm TF: TR piv.
Theaflavins thiab thearubigins yog cov yam ntxwv cov khoom tsim los ntawm catechins thaum lub sij hawm enzymatic oxidation ntawm tshuaj yej thaum tsim khoom. Theaflavins muab cov txiv kab ntxwv los yog txiv kab ntxwv-liab xim rau tshuaj yej thiab pab txhawb rau lub qhov ncauj qhov ntswg thiab ib tug npaum li cas ntawm cream tsim. Lawv yog cov dimeric compounds uas muaj benzotropolone skeleton uas yog tsim los ntawm co-oxidation ntawm xaiv khub ntawm catechins. oxidation ntawm B nplhaib ntawm ob tog (−)-epigallocatechin los yog (−)-epigallocatechin gallate yog ua raws li los ntawm kev poob ntawm CO2 thiab ib txhij fusion nrog lub nplhaib B ntawm (−)-epicatechin los yog (−)-epicatechin gallate molecule (Daim duab 12.2 ). Plaub qhov loj theaflavins tau raug txheeb xyuas hauv cov tshuaj yej dub: theaflavin, theaflavin-3-monogallate, theaflavin-3′-monogallate, thiab theaflavin-3,3′-digallate. Tsis tas li ntawd, lawv cov stereoisomers thiab derivatives tuaj yeem muaj. Tsis ntev los no, muaj cov theaflavin trigallate thiab tetragallate hauv cov tshuaj yej dub tau tshaj tawm (Chen li al., 2012). Theaflavins tuaj yeem raug oxidized ntxiv. Tej zaum lawv kuj yog cov precursors rau kev tsim ntawm polymeric thearubigins. Txawm li cas los xij, cov txheej txheem ntawm cov tshuaj tiv thaiv tsis paub tam sim no. Thearubigins yog xim liab-xim av lossis tsaus-xim av xim hauv cov tshuaj yej dub, lawv cov ntsiab lus suav txog li 60% ntawm qhov hnyav qhuav ntawm tshuaj yej infusion.
Hais txog cov txiaj ntsig kev noj qab haus huv, Theaflavins tau kawm ntau ntxiv rau lawv lub luag haujlwm muaj peev xwm los txhawb kev mob plawv. Kev tshawb fawb tau qhia tias Theaflavins tuaj yeem pab txo qis cov roj cholesterol, txhim kho cov hlab ntsha ua haujlwm, thiab siv cov tshuaj tiv thaiv kab mob, txhua yam muaj txiaj ntsig zoo rau cov hlab plawv. Tsis tas li ntawd, Theaflavins tau pom tias muaj peev xwm inhibit qhov kev loj hlob ntawm cov qog nqaij hlav cancer thiab tej zaum yuav muaj cov khoom tiv thaiv ntshav qab zib.
Ntawm qhov tod tes, Thearubigins tau cuam tshuam nrog cov tshuaj tiv thaiv antioxidant thiab tiv thaiv kab mob, uas yog qhov tseem ceeb rau kev tawm tsam oxidative kev nyuaj siab thiab mob hauv lub cev. Cov khoom no tuaj yeem ua rau muaj peev xwm tiv thaiv kev laus thiab tiv thaiv tawv nqaij ntawm Thearubigins, ua rau lawv muaj kev txaus siab rau kev tu tawv nqaij thiab kev tshawb fawb txog hnub nyoog.
Hauv kev xaus, Theaflavins thiab Thearubigins yog cov tshuaj polyphenolic sib txawv hauv cov tshuaj yej dub, txhua tus muaj cov tshuaj lom neeg tshwj xeeb thiab cov txiaj ntsig kev noj qab haus huv. Thaum Theaflavins tau txuas nrog kev noj qab haus huv ntawm cov hlab plawv, cov khoom tiv thaiv qog noj ntshav, thiab muaj peev xwm tiv thaiv ntshav qab zib, Thearubigins tau cuam tshuam nrog antioxidant, tiv thaiv kab mob, thiab tiv thaiv tawv nqaij, ua rau lawv muaj kev txaus siab rau kev tiv thaiv kev laus thiab kev tu tawv nqaij. kev tshawb fawb.
Cov ntaub ntawv:
Hamilton-Miller JM. Antimicrobial zog ntawm tshuaj yej (Camellia sinensis L.). Antimicrob Agents Chemother. 1995; 39(11): 2375-2377.
Khan N, Mukhtar H. Tshuaj yej polyphenols rau kev txhawb nqa kev noj qab haus huv. Lub neej Sci. 2007; 81(7):519-533.
Mandel S, Youdim MB. Catechin polyphenols: neurodegeneration thiab neuroprotection hauv cov kab mob neurodegenerative. Dawb Radic Biol Med. 2004; 37(3):304-17.
Jochmann N, Baumann G, Stangl V. Ntsuab tshuaj yej thiab kab mob plawv: los ntawm cov hom phiaj molecular rau tib neeg noj qab haus huv. Curr Opin Clin Nutr Metab Care. 2008; 11(6): 758-765.
Post lub sij hawm: May-11-2024
