福建11选5开奖结果

Vitamin a price, vitamin a effect, vitamin a food

News classification

Contact us

Co。:Tongxiang Jujia Food Additive Co。, Ltd。

Add:2nd Floor, 1688-1690, Fuxing North Road, Wutong Street, Tongxiang City

TEL:0573-88080826

FAX:0573-88080810

MB:13356058388

Email:516860949@qq。com

Website:en.luvdelphin.com


Six major physiological functions of vitamin A

Your current position: Home page >> News >> company news

Six major physiological functions of vitamin A

Date of release:2018-11-02 Author: Click:

1, maintain normal visual function

The photoreceptor of the eye is a rod-shaped cell and a cone-shaped cell in the retina. Both of these cells have sensitizing pigments, namely rhodopsin which is weak in light and rhodopsin which is glare-sensitive. Both rhodopsin and rhodopsin are composed of opsin and retinal. After rhodopsin is irradiated with light, 11-cis-retinal constitutes retro-retinal, which is separated from opsin and loses color. This process is called "bleaching". If you enter the dark, the rhodopsin that is sensitive to low light disappears, so you can't see things.

The isolated retinal is reduced to all-trans retinal, further converted to trans-retinyl ester (or isomerized to cis) and stored in the pigment epithelium. From the retinal retinyl hydrolase, the retinyl ester is converted to trans retinol, oxidized and isomerized to form 11-cis retinal. Re-integration with protein into rhodopsin restores sensitivity to low light, so that it can be seen in the dark of certain illuminance. This process is called DarkAdaptation. Retinol released by the liver binds to retinol-binding protein (RBP), binds to prealbumin in plasma, transports it to the retina, and participates in the photochemical reaction of the retina. If vitamin A is sufficient, rhodopsin regenerates rapidly. Completely, the dark adaptation time is short; if the vitamin A is insufficient, the rhodopsin regeneration is slow and incomplete, so the dark adaptation recovery time is prolonged, and the night blindness (NightBlindness) can be generated in severe cases.

2. Maintain the health of epithelial cells and promote the synthesis of immunoglobulins

Vitamin A can be involved in the synthesis of glycoproteins, which is important for the normal formation, development and maintenance of the epithelium. When vitamin A is insufficient or lacking, it can lead to abnormalities in glycoprotein synthesis intermediates, low molecular weight polysaccharide-lipid accumulation, causing hyperplasia and thickening of epithelial basal layer, accelerated cell division, increased synthesis of tensile fibrils, and cell changes in surface layers. Flat, irregular, dry, etc. The keratinization of the nasal, pharyngeal, larynx and other respiratory, gastrointestinal and genitourinary endometriums weakens the natural barrier (structure) that prevents bacterial attack and is susceptible to infection. In children, it is highly prone to respiratory infections and diarrhea. Some kidney stones are also associated with urinary tract keratinization. Excessive intake of vitamin A, the resistance to epithelial infection does not increase with the dose.

Immunoglobulin is a glycoprotein, so vitamin A can promote the synthesis of this protein, which has an important effect on the immune function of the body. When it is lacking, the cellular immunity is decreased.

3。 Maintain normal bone growth and development

Vitamin A promotes protein biosynthesis and differentiation of bone cells。 When it is lacking, the balance between osteoblasts and osteoclasts is destroyed, or the bones are excessively proliferated due to enhanced osteogenic activity, or the formed bones are not absorbed。 Pregnant women who lack vitamin A will directly affect fetal development and even have stillbirth。

4. Promote growth and reproduction

Vitamin A helps cells to proliferate and grow. When animals are deficient in vitamin A, there is a marked growth stagnation, which may be related to decreased appetite and decreased protein utilization. When vitamin A is deficient, it affects the spermatogenic epithelium of male animals to produce spermatocytes, and the female vaginal epithelial cycle changes, which also affects the placental epithelium, which hinders embryo formation. Vitamin A deficiency also causes a decrease in the activity of enzymes required to catalyze the formation of progesterone precursors, and reduces the production of steroids in the adrenal glands, gonads and placenta, which may be responsible for reproductive function.

5, inhibit tumor growth

Clinical trials have shown that vitamin A acid (retinoic acid) substances have retarded or prevented precancerous lesions and prevented the action of chemical carcinogens, especially for epithelial tumors, which have achieved good results as clinical adjuvants。 Beta-carotene has anti-oxidation effect and has been reported in recent years。 It is an effective antioxidant for capturing active oxygen。 It is important for preventing lipid peroxidation, preventing cardiovascular diseases, tumors, and delaying aging。

6, nutritional supplements

It is used as a nutrient additive in cosmetics to prevent rough skin and promote normal growth and development。 It can be used in cream emulsions。

Although vitamin A has the above-mentioned effects and more beneficial functions to the human body, it is the same as other nutrients, and the extremes must be reversed。 Excessive intake can cause headache, nausea and diarrhea, liver and spleen, etc。, and need appropriate intake。

Tongxiang Jujia Food Additive Co., Ltd. products include more than 100 varieties of vitamins and their derivatives, minerals, amino acids, plant extracts, imported dairy products. The sales network covers all parts of the country. The company can not only provide high-quality products and services to our customers, but also help you solve technical problems in production. If you want to understand the role of vitamin A and vitamin a can be contacted: 13356056388.


Vitamin A maintains bone development

The address of this article:http://en.luvdelphin.com/news/363.html

Key word:Vitaminafunction,VitaminAactionphysiologicalfunction,VitaminAfoodpromotesgrowth

Recently browse:

Related Products:

Related News:

News information
Company profile

Co.:Tongxiang Jujia Food Additive Co., Ltd.

Add:2nd Floor, 1688-1690, Fuxing North Road, Wutong Street, Tongxiang City

TEL:0573-88080826

FAX:0573-88080810

MB:13356058388

Email:516860949@qq。com

Website:en.luvdelphin.com

Vitamin a price, vitamin a effect, vitamin a food

福建11选5开奖结果  WeChat

  • Service
  • number
    13356058388
  • Message
  • web site
  • Online Service
    Please leave a message for us
    Please input the message here, and we will contact you as soon as possible.
    Full name
    Contacts
    Telephone
    Seat / mobile phone number
    mailbox
    mailbox
    address
    address
    福建11选5 福建11选5走势图 帝皇彩票APP下载 福建11选5 帝皇彩票APP下载 福建11选5 福建11选5走势图 鼎汇彩票 福建11选5开奖结果 福建11选5分布走势图