Qhov sib txawv tseem ceeb ntawm cis thiab cov roj trans fats yog tias nyob rau hauv cis rog, ob lub H atoms nyob rau tib sab ntawm ob daim ntawv cog lus thaum nyob rau hauv cov rog trans, ob H atoms muaj nyob rau ntawm qhov opposite sab ntawm ob. daim ntawv cog lus.
Cov rog lossis fatty acids yog carboxylic acids uas muaj cov kab ncaj nraim ntawm cov pa roj carbon atoms, nrog hydrogen atoms raws qhov ntev ntawm cov saw thiab ib pawg carboxyl ntawm lwm qhov kawg. Cov aliphatic chains ntev no yog saturated los yog unsaturated. Saturated fatty acids tsis muaj carbon-carbon ob daim ntawv cog lus, thaum unsaturated fatty acids muaj ob daim ntawv cog lus ntawm carbon atoms. Thaum ob daim ntawv cog lus tshwm sim hauv nruab nrab ntawm cov saw hlau, nws tuaj yeem yog cis lossis trans. Hauv cis rog, ob daim ntawv cog lus nrog ob lub hydrogen atoms ntawm tib sab ntawm ob daim ntawv cog lus. Hauv cov rog trans, ob daim ntawv cog lus nrog ob lub hydrogen atoms ntawm ob sab ntawm ob daim ntawv cog lus.
Cis Fat yog dab tsi?
Cis rog yog ib daim ntawv ntawm unsaturated fatty acids. Hauv cis rog, ob lub atoms hydrogen nyob rau tib sab ntawm ob daim ntawv cog lus ntawm fatty acid cov roj carbon saw caj qaum. Cis rog yog khoov chains. Yog li ntawd, lawv tsis ruaj khov dua piv rau cov rog trans. Ntxiv mus, cis daim ntawv cog lus tsim lub zog siab teeb tsa. Thaum lub sij hawm hydrogenation, qee qhov cis bonds hauv fatty acids tau hloov mus rau hauv cov ntawv cog lus, ua rau cov roj ntsha trans fatty acids.
Daim duab 01: Cis thiab Trans Fat
Trans Fat yog dab tsi?
Trans fats lossis trans fatty acids yog hom unsaturated fatty acids. Hauv cov rog trans, ob lub hydrogen atoms pom nyob rau sab nraud ntawm ob daim ntawv cog lus ntawm fatty acid cov pa roj carbon saw caj qaum. Yog li ntawd, nyob rau hauv cov rog trans, txhua qhov kawg ntawm ob daim ntawv cog lus yuav muaj ib qho hydrogen atom lo rau sab. Hauv kev sib piv rau cis rog, cov roj trans rog ruaj khov, thiab lawv pab khaws cov khoom noj. Trans fats tshwm sim ib txwm mus rau ib qho me me. Yog li ntawd, lawv yog tsim los ntawm hydrogenation. Mis, butter thiab nqaij muaj cov roj ntsha uas tshwm sim thaum lub khob noom cookie, ncuav mog qab zib, ncuav qab zib, cov khoom noj khov xws li pizza, ncuav qab zib, crackers, nplaum margarine, txiv laum huab xeeb, mis nyuj creamers, hmoov ntses thiab hnav khaub ncaws thiab hmoov kub cocoa muaj cov roj ntsha sib txawv.
Daim duab 02: Trans Fat Foods
Cov rog rog ua rau nce cov lipoprotein tsawg-density cholesterol, uas tuaj yeem ua rau muaj kev pheej hmoo ntawm cov kab mob plawv. Yog li ntawd, nws yog ib qho tsim nyog yuav tsum txo qis kom tsawg ntawm cov rog trans rog.
Dab tsi zoo sib xws ntawm Cis thiab Trans Fat?
- Cis thiab trans fats yog ob subtypes fatty acids.
- Lawv muaj tib lub qauv molecular.
- Lawv cov pa roj carbon, hydrogen thiab oxygen atoms yog tib yam thiab tib yam.
- Lawv muaj ob daim ntawv cog lus nyob nruab nrab ntawm lub molecule.
- Thaum lub sijhawm ua haujlwm ntawm hydrogenation, qee qhov cis bonds hauv fatty acids tau hloov mus rau hauv cov ntawv cog lus, ua rau cov roj ntsha trans fatty acids.
- Saturated fatty acids muaj cov ntsiab lus melting ntau dua li ob qho tib si trans thiab cis fatty acids
Qhov txawv ntawm Cis thiab Trans Fat yog dab tsi?
Cis rog muaj ob lub hydrogen atoms ntawm tib sab ntawm ob daim ntawv cog lus. Trans fats muaj ob lub hydrogen atoms ntawm qhov opposite sab ntawm ob daim ntawv cog lus. Yog li, ntawm cov tshuaj lom neeg, qhov no yog qhov sib txawv tseem ceeb ntawm cis thiab trans rog. Ntxiv mus, lwm qhov sib txawv tseem ceeb ntawm cis thiab trans rog yog cov rog trans yog thermodynamically ruaj khov dua cis rog. Tsis tas li ntawd, cov rog trans muaj qhov melting ntau dua li cis rog.
Hauv qab infographic qhia ntau qhov sib txawv ntawm cis thiab trans rog hauv daim ntawv tabular rau ib sab ntawm kev sib piv.
Summary – Cis vs Trans Fat
Cis thiab trans fats yog ob hom ntawm unsaturated fatty acids. Hauv cis rog, ob lub hydrogen atoms nyob rau tib sab ntawm ob daim ntawv cog lus. Yog li ntawd, cis daim ntawv cog lus tsim ib txoj hlua khoov. Nyob rau hauv cov rog trans, ob lub hydrogen atoms nyob rau sab nraud ntawm ob daim ntawv cog lus. Ntxiv mus, ib daim ntawv cog lus trans ua ib txoj saw ncaj. Trans fats yog geometric isomers ntawm cis rog. Yog li, qhov no yog cov ntsiab lus ntawm qhov sib txawv ntawm cis thiab trans rog.
