顺式和反式脂肪的区别

Thekey differencebetween顺式和transfat is that在顺式脂肪中，两个H原子存在于double bondwhile in trans fats, two H atoms are present on the opposite sides of the double bond.

Fats or fatty acids arecarboxylic acidscomprised of a straight chain of an even number of carbon atoms, with hydrogen atoms along the length of the chain and a carboxyl group at the other end. These long aliphatic chains are eithersaturated or unsaturated. Saturated fatty acids do not have carbon-carbon double bonds, while unsaturated fatty acids have double bonds between carbon atoms. When a double bond occurs in the middle of the chain, it can either be cis or trans. In cis fats, the double bond forms with the two hydrogen atoms on the same side of the double bond. In trans fats, the double bond forms with the two hydrogen atoms on opposite sides of the double bond.

内容

1.Overview and Key Difference
2.什么是顺式脂肪
3.What is Trans Fat
4.Similarities Between Cis and Trans Fat
5.Side by Side Comparison – Cis vs Trans Fat in Tabular Form
6。概括

什么是顺式脂肪？

Cisfat is a form of unsaturated fatty acids. In顺式脂肪，两个氢原子位于脂肪酸碳链主链双键的同一侧。Cisfats are bent chains. Therefore, they are less stable compared totrans脂肪。Moreover,顺式bonds form high energy configuration. During hydrogenation, some of the顺式脂肪酸中的键转化为transbonds, resulting in trans fatty acids.

What is Trans Fat?

Trans fats or trans fatty acids are a type of unsaturated fatty acids. In trans fats, two hydrogen atoms are found on opposite sides of the double bond of the fatty acid’s carbon chain backbone. Therefore, in trans fats, each end of the double bond will have a single hydrogen atom sticking off to the side. In comparison to cis fats, trans fats are stable, and they help to preserve foods. Trans fats occur naturally only to a small degree. Hence, they are created through hydrogenation. Milk, butter and meat contain naturally occurring trans fats while doughnuts, cakes, pie crusts, frozen foods such as pizza, cookies, crackers, stick margarine, peanut butter, dairy creamers, powdered sauces and dressings and powdered hot cocoa contain artificial trans fats.

反式脂肪会导致低密度脂蛋白胆固醇的增加，从而增加心血管疾病的风险。因此，有必要最大程度地减少反式脂肪的摄入。

What are the Similarities Between Cis and Trans Fat?

• Cis and trans fat are two subtypes of fatty acids.
• They have the exact same molecular structure.
• Their number of carbon, hydrogen and oxygen atoms are the same and in the same order.
• They have a double bond in the middle of the molecule.
• During the process of hydrogenation, some cis bonds in fatty acids are transformed into trans bonds, resulting in trans fatty acids.
• 饱和脂肪酸具有比两者都高的熔点trans和顺式脂肪酸

顺式和反式脂肪有什么区别？

Cis fats have two hydrogen atoms on the same side of the double bond. Trans fats have two hydrogen atoms on the opposite sides of the double bond. So, on the chemical aspect, this is the key difference between cis and trans fat. Moreover, another important difference between cis and trans fat is that trans fats are thermodynamically more stable than cis fats. Furthermore, trans fats have a higher melting point than cis fats.

下面的信息图显示了与表格形式的顺式和反式脂肪之间的更多差异，以与并排比较。

摘要 - 顺式vs反式脂肪

Cis and trans fats are two forms of unsaturated fatty acids. In cis fats, two hydrogen atoms are on the same side of the double bond. Therefore, the cis bond forms a bent chain. In trans fats, two hydrogen atoms are on the opposite sides of the double bond. Moreover, a trans bond forms a straight chain. Trans fats are geometric isomers of cis fats. Thus, this is the summary of the difference between cis and trans fat.

Reference:

1. Marchand，V。“反式脂肪：医生应该知道什么。”PAEDIATRICS与儿童健康，Pulsus Group Inc，2010年7月，Available here.

Image Courtesy:

1.“顺式跨性别”(CC BY 2.5)viaCommons Wikimedia
2. “2253349” (CC0) viaPixabay