2024 Tus sau: Jasmine Walkman | [email protected]. Kawg hloov kho: 2023-12-16 08:31
Cov mis ib txwm siv ntawm isothiocyanates - R-N = C = S
Isothiocyanates (mustard roj) yog cov organic sib txuas - tshuaj tiv thaiv kab mobmuaj cov pawg ua haujlwm N = C = S thiab sulfur analogue isocyanates R - N = C = O1.
Cov tshuaj tiv thaiv ntawm isothiocyanates
Isothiocyanates, zoo li isocyanates, yog heterocumulated nrog lub chaw electrophilic ntawm cov pa roj carbon atom thiab yog tus cwj pwm los ntawm cov tshuaj tiv thaiv nucleophilic ntxiv:
R-N = C = S + NuH ntawm R-NH-C (= S) Nu
(Nu = LOS, Oar, SH, SR, NH2, NR1R2, RNHNH2, RH = NNH2, CN)
Thaum isothiocyanates hnov mob nrog cawv thiab phenols, thiocarbamates, dithiocarbamates nrog thiols, nrog amines - N, N - disubstituted thioureas nrog amines, thiosimicarbazides nrog hydrazines thiab thiosemicarbazones nrog aldehydes hydrazones tau tsim.
Thaum sib cuam tshuam nrog C-nucleophiles, isothiocyanates ua rau theem nrab amides, qhov no ntxiv tau raws li hauv kev sib cuam tshuam ntawm isothiocyanate nrog carbanions (Grignard reagents, carbanions ntawm β-dicarbonyl tebchaw, thiab lwm yam).
R-N = C = S + R1MgX rau R-NH-C (= S) R1, Thiab kev xav txog Friedel-Crafts cov tshuaj tiv thaiv:
R-N = C = S + ArH ntawm R-NH-C (= S) Ar
Isothiocyanates txuas rau cov kab mob carboxylic thiab thiocarboxylic, thiab cov pa roj carbon disulfide lossis carbon monoxide yog muab pov tseg los ntawm cov tsis khov uas tsis khov, uas tseem ua rau kev tsim cov theem nrab:
R = N = C = S + R1COXH ntawm R-NH-C (= S) XCOR1
R-NH-C (= S) XCOR1 txog R-NHCOR1 + CSX
(X = O, S)
Isothiocyanates raug txo nrog sodium borohydride mus rau theem nrab thioformamides RNHC (S) H, lithium aluminium hydride rau cov tshuaj tiv thaiv methylamines RNHCH3, zinc hauv hydrochloric acid rau thawj amines RNH2.
Nyob hauv kev txiav txim ntawm mercuric oxide, isothiocyanates daim isocyanates:
R = N = C = S + HgO ntawm R-N = C = O + HgS
Cov tebchaw ua rau apoptosis (kev tuag ntawm cov qog nqaij hlav cancer) thiab ua xaiv yam khoom.
Qhov chaw ntawm isothiocyanates yog cov zaub cob pob, zaub paj, horseradish thiab dub mustard noob, zaub los ntawm cov zaub qhwv hauv tsev neeg. Cov nroj tsuag no muaj sinigrin glycosylate, uas ua rau lub cev hydrolyzothiocyanate thaum muaj hydrolysis, uas ua rau muaj kev kub hnyiab ntawm mustard thiab horseradish. Qee qhov isothiocyanates, xws li phenethyl isothocyanate thiab sulforaphane, tuaj yeem cuam tshuam cov carcinogenesis thiab kev tsim cov qog.
Pom zoo:
Dab Tsi Yog Surimi Thiab Dab Tsi Yog Nws Siv Rau?
Surimi ib txwm nyob rau sab Asia. Txhais los ntawm Japanese surimi txhais tau tias ntxuav ntses thiab minced ntses. Surimi tau tsim thawj txog ntau txhiab xyoo dhau los hauv Nyij Pooj. Nws yog qhov ib txwm muaj tseeb uas surimi tau tsim los ntawm Japanese, vim rau ntau pua xyoo ntses tau lawv cov khoom noj tseem ceeb.
Dab Tsi Yog Txhuv Nplaum Thiab Nws Tau Siv Rau Dab Tsi?
Cov qoob no yog hu ua nplaum lossis qab zib nplej Cov. Txawm hais tias lub npe, nws yog ib puag ncig mov uas pom tau tam sim ntawd los ntawm nws cov ntawv nplaum zoo li kua nplaum. Qhov zoo ntawm cov txhuv vim yog vim tsis muaj cov amylose tivthaiv.
Dab Tsi Yog Isot Thiab Dab Tsi Yog Nws Cov Txiaj Ntsig
Isot yog lub npe ntawm ib hom kua txob cog hauv lub nroog Sanliurfa, Qaib Cov Txwv. Qhov tseem ceeb tshaj plaws hauv qhov kev npaj ntawm isot yog hnub ci zog. Cov kua txob kub tau muab tshem tawm los ntawm cov noob hauv thaj chaw tiaj tiaj raug tshav ntuj thiab pub kom qhuav ntawm qhov chaw huv.
Dab Tsi Yog Hydrolyzed Collagen Thiab Dab Tsi Yog Nws Zoo Rau?
Collagen yog cov protein muaj qauv uas khi cov hlwb thiab cov nqaij ua ke thiab pab lawv tuav lawv cov duab thiab kev ntseeg siab. Nws yog cov protein uas muaj nplua nuj tshaj plaws hauv tib neeg lub cev. Nws muaj nyob hauv cov leeg nqaij, tawv nqaij, ntshav, pob txha, pob txha mos thiab leeg.
Resveratrol Yog Dab Tsi Thiab Dab Tsi Yog Qhov Zoo Rau?
Resveratrol yog lub ntuj sib xyaw muaj nyob hauv txiv hmab tawv nqaij, tab sis txij li tsuas yog me me tuaj yeem muab rho tawm los ntawm daim tawv nqaij ntawm cov txiv ntoo no, nws tau muab rho tawm los ntawm kev sib txuas - tshuaj lom neeg thiab biotechnological.
