Peb teb cov lus nug. Yog vim li cas cov kua tsaus ntuj nyob rau hauv cov kev txiav?

Lub ntiaj teb no nyob ib ncig ntawm peb yog amazing. Thiab yog hais tias cov me nyuam to taub nws yooj yim, nrog rau cov xyoo ua accustomed mus ntau yam thiab tsis nco qab txog nws yam xyuam xim. Raws li ib tug tshwm sim, feem ntau yooj yim tus me nyuam cov lus nug yuav muab tso rau ib tug neeg laus ntawm ib tug standstill. Piv txwv li: "Vim li cas ib cov kua tsaus rau cov kev txiav?" Qhov no tus txheej txheem yog heev ntau yam, tiam sis tsis yog li yooj yooj yim li no mas, thaum xub thawj siab ib muag. Tom qab tag nrho, txawv tsaus ntuj apples nyob rau hauv ntau txoj kev, thiab ib txhia tsis tsaus ntuj.

Dispelling myths xwb

Feem ntau cov feem ntau, thaum nug txog yog vim li cas kua tau tsaus rau tus txiav, lawv hnov hais tias nws yog vim lub muaj hlau. Lwm lub tsev kawm ntawv chav kawm ntawm Science News for KIDS zoo paub hais tias hlau muaj ib tug valence (los yog oxidation lub xeev) +2 thiab +3. Yog li, nyob rau hauv apples, nws muaj ib tug thawj degree ntawm oxidation. Txawm li cas los, tom qab txiav pib nquag tuaj mus rau hauv kev sib cuag nrog huab cua, uas muaj oxygen. Raws li ib tug tshwm sim, cov hlau yog oxidized rau 3 degrees, li no txoj kev ua oxide. Nws hloov tawm hais tias ib tug kua ib "xeb". Thiab cov xim tau txais nws.

Txawm li cas los, tej chemist paub hais tias nws tsis yog. Ib Kua luj ntawm txog 150-160 grams muaj tsuas 3.4 milligrams ntawm hlau. Yog tus nqi no txaus lwj qhov zoo ntawm tag nrho cov txiv hmab txiv ntoo? Ntawm cov hoob kawm tsis tau. Nyob rau hauv qhov tseeb, nws yog lub luag hauj lwm rau ib tug txawv kiag li teeb meem. Tom qab qhov no tshwm sim, thiab pears, thiab tsawb. Tab sis lawv tsis muaj xws li ib tug loj tus naj npawb ntawm hlau.

qhov tseeb ua

Yog li ntawd yog vim li cas tsaus ntuj nyob rau hauv cov kev txiav Kua, yog tias muaj yuav luag tsis muaj tej hlau? Tom qab txiv hmab txiv ntoo puas tsuaj tshwm sim ib tug xov tooj ntawm cov tshuaj tshua, vim hais tias ntawm cov uas nws loses nws marketability. Tiam sis yog tias koj lw lub saw, koj yeej tseem to taub qhov tseeb ua.

Raws li koj paub, apples, zoo li lwm yam txiv hmab txiv ntoo, yog nplua nuj nyob rau hauv antioxidants. Sib lawv raug xa mus rau cov pab pawg neeg ntawm polyphenols. Lawv muaj ntau lub npe, tab sis lawv yog ib tug - qhov no compound yog txawv phenols (tsis yuav tsis meej pem nrog lub tshuaj lom). Ntawm cov hoob kawm, qhov no nyob rau hauv nws tus kheej yog ib yam khoom uas tsis muaj feem xyuam xim ntawm ib cov kua, raws li nws yog tsuas yog ib tug tsis muaj kob. Tab sis nws tseem muaj lub polyphenol oxidase enzyme, tom qab uas muaj kev puas tsuaj pib los mus sib tham nrog polyphenols. Lub ntsiab catalyst cov tshuaj tiv thaiv yog oxygen. Thiab raws li ib tug tshwm sim, nyob rau hauv apples nyob rau hauv loj tus xov tooj tsim quinone, thiab nws - ib tug muaj zog oxidizer. Qhov ntawd yog qhov tseeb cov lus teb rau cov nqe lus nug ntawm yog vim li cas kua tau tsaus rau cov kev txiav.

Yuav ua li cas?

Ntawm cov hoob kawm, cov cuab yeej no txiv apples kom ntau tsis nyiam. Txiv hmab txiv ntoo sai sai poob ib tug txaus nyiam tsos, thiab txawm tshiab hlais xwb ib ob peb feeb pib mus saib tsis txaus nyiam heev. Tse tau ntev tuaj mus nrog ib txoj kev mus nrog no shortcoming. Nws yog txaus rau txiav xuas txiv qaub tev thiab sprinkle nrog txiv qaub kua txiv. Lwm embodiment - yog lowered mus rau 1-2 feeb txiv hmab txiv ntoo citric acid tshuaj. Raws li ib tug tshwm sim, lub kua tsis darken rau tus txiav.

Rau Kua kua txiv coined lwm cov kev xaiv. Ua li no, cias pasteurized rau 20-30 feeb ntawm 70-80 degrees. Raws li ib tug tshwm sim, nws yuav raug puas tsuaj polyphenol oxidase. Yog li ntawd, tsis tau mus pib cov txheej txheem ntawm oxidation nyob rau hauv tus. Rau tag nrho cov apples no txoj kev, hmoov tsis, tsis haum.

Qhov scientific mus kom ze

Nws yog pom tseeb tias, los ntawm tshem ib tug ntawm peb lub Cheebtsam ntawm cov tshuaj tiv thaiv, nws tseem tau mus xyuas kom meej tias apples yog tsis darkened. Tu siab, nws yog tsis yooj yim sua kom tshem tau ntawm polyphenols. Nyob rau hauv tas li ntawd, nws yog ntseeg hais tias lawv yog pab tau rau cov kab mob. Thiab tus thawj yam uas twb tiav - mus cais los ntawm cov tshuaj tiv thaiv ntawm cov pa. Rau no apples coated nrog ib tug tshwj xeeb tshuaj, xws li cov ciab (raws li cov thoob ntiaj teb txuj no yog cim E901-E913). Txawm li cas los, ua ntej rau cov kev siv ntawm tej txiv hmab txiv ntoo nyob rau hauv khoom noj khoom haus txheej yog qhov kev kawm yaug.

Tab sis science tsis sawv tseem. Tom qab tag nrho, nws tau ntev tau paub yog vim li cas kua tau tsaus rau cov kev txiav. Kev nthuav qhia los ntawm ib tug tshiab txhob kaw-hloov ntau yam muaj pov thawj hais tias yog tshem cov enzyme-oxidant yuav tau cias "nyob mus ib txhis" apples. Zoo meej tov rau supermarkets thiab cov khw nojmov. Tshwj xeeb tshaj yog hais tias nws coj xwb thaiv tej noob. Nws yog ntseeg hais tias qhov no technology yog lub feem ntau harmless.