Endogenousfíteastaróilní féidir é a shintéisiú agus ní féidir é a fhorlíonadh ach le foinsí eisghineacha. Mar sin féin, tá an ráta ionsú stéaróil íseal, go bunúsach 0.4 faoin gcéad 4 faoin gcéad . Tabharfaidh an t-alt seo isteach tú ar an bpróiseas ionsúcháin fíteastaróil agus na fachtóirí a mbíonn tionchar acu ar ionsú.
Ionsú Fíteastaróil
Tá sé léirithe ag staidéir gur féidir an próiseas ionsúcháin a roinnt ina 3 chéim mar a thaispeántar thíos:
①Phytosterols form mixed micelles with bile acids and free fatty acids in the intestinal lumen;
②The mixed micelles are close to the epithelial cells. The phytosterols are freed from the micelles and absorbed into the cells by the relevant transporters on the cell membrane;
③ The sterol that enters the cell is esterified under the intracellular ACAT enzyme (cholesterol acyltransferase). Then forms chyle with triglyceride and apolipoprotein under the action of MTP (triglyceride transfer protein), which is secreted into the cell. blood circulation system.
Fachtóirí a mbíonn tionchar acu ar ionsú
In general, it decreases with increasing C atoms (campesterol > β-sitosterol >stiogmatarol). An ráta ionsú defíteastaróil in different origins is also different. Such as plants produced in high temperature areas, the proportion of campesterol content is increased, so the absorption rate is also higher. From the perspective of absorption process, esterification is the basis of absorption. The absorption of esterified sterols is 5 times that of non-esterified sterols. Whether the double bond on the carbon atom at the 5th position is saturated also affects the absorption rate, eg campesterol >campesterol. Ach is ar éigean a ionsúitear béite-glútanol. Déantar stéaróil phlanda ionsúcháin a dháileadh go roghnach ar chodanna éagsúla den chorp, leis an ábhar is airde san ae, faireoga adrenal, agus gonads, ionas gur féidir leo fás a chur chun cinn agus an endocrine a rialáil.