注册 登录  
 加关注
   显示下一条  |  关闭
温馨提示!由于新浪微博认证机制调整,您的新浪微博帐号绑定已过期,请重新绑定!立即重新绑定新浪微博》  |  关闭

Jackson二抗授权|蛋白|细胞因子

西宝生物科研试剂团队服务糖,寡糖,多糖及检测服务和原料供应。Jackson二抗

 
 
 

日志

 
 
关于我

R&D Systems公司细胞生物学,提供优质的蛋白质,抗体,ELISA试剂盒,实验室试剂,细胞因子.包括Novus Biologicals, BiosPacific, Tocris Bioscience, Boston Biochem和Bionostics. Jackson二抗中国授权代理

网易考拉推荐
GACHA精选

维生素E —— 生育酚 和生育三烯酚  

2013-09-05 11:17:41|  分类: 标准品(对照品) |  标签: |举报 |字号 订阅

  下载LOFTER 我的照片书  |



生育三烯酚(Tocotrienols)是棕榈油和米糠油中存在的一种功能性成分,其化学结构类似于生育酚。近年来,研究表明其具有比生育酚更优越的生理功能。

自然界中已知的维生素E有8种,分别为两类的:生育酚和生育三烯酚, 各有四种即α、β、γ、δ同分异构体。生育酚和生育三烯酚的主要区别表现在侧链 - 生育酚侧链为饱和脂肪酸,而后者侧链是含三个双键的不饱和脂肪酸。
 
维生素E又称生育酚(Tocopherol),是一类具有生物活性的、化学结构相似的酚类化合物的总称。维生素E在化学结构上均为苯并一氢吡喃的衍生物,包括生育酚和生育三烯酚两类,是一类脂溶性维生素。生育酚和生育三烯酚的主要结构都为一个氢醌基团加上一条类异戊二烯侧链,两者的主要区别表现在生育酚的侧链为饱和脂肪酸,而后者侧链是含三个双键的不饱和脂肪酸,分别位于3’,7’,11’位置 。生育酚主要存在于玉米油、豆油和橄榄油中,而生育三烯酚则富含于棕榈油、米糠油和大麦油内。而含有最高生育三烯酚的是棕榈油 (主要为γ 、α、δ、β-生育三烯酚)。

维生素E —— 生育酚 和生育三烯酚 - Solomon - 标准品生化试剂毒素酶试剂盒当前您的位置:首页>>产品动态>>公告>>维生素E:生育酚及三烯生育酚

Vitamin E: Tocopherols & Tocotrienols
生育酚

Research use only. Do not administer it to human.
2109          α-Tocotrienol    25 mg  98+% TLC/98+% GC
2110          β-Tocotrienol    25 mg  98+% TLC/98+% GC
2111          γ- Tocotrienol    25 mg  98+% TLC/98+% GC
2112          δ-Tocotrienol    25 mg  98+% TLC/98+% GC

Contents:
d-α-tocopherol, 98.5+% [CAS 59-02-9] 1 vial x 250 mg
d-β-tocopherol, 98.5+% [CAS 148-03-8] 1 vial x 250 mg
d-γ-tocopherol, 98.5+% [CAS 54-28-4] 1 vial x 250 mg
d-δ-tocopherol, 98.5+% [CAS 119-13-1] 1 vial x 250 mg
2,2,5,7,8-Pentamethyl-6-hydroxychroman (PMC), 99.0+% [CAS 950-99-2] 1 vial x 250 mg
Note: PMC is used as the internal standard for HPLC analysis of tocopherol, but not for GC analysis.
Storage condition:
Each vial is aluminum-packed with an oxygen adsorbent. One opening the vials, store the reagent under inert gas in a refrigerator in the dark. Under such conditions, the reagents are stable for 6 months.
Instruction for use (Preparation of each solution)
Weigh 50 ~ 100 mg of each reagent by chemical balance, to the nearest 0.1mg.
Add ethanol or hexane to dissolve the reagent to the final concentration of 1 mg vitamin homologue/mL as the stock solution. The stock solution in tightly capped vials are stable at 5 degrees C for a month.
The standard solutions for each homologue can be prepared by dilution the stock solution just before use.

α β γ δ -  三烯生育酚 标准品

1072                     rac-α-Tocopherol 50 mg  95+% TLC/98+% GC
1071                     rac-β-Tocopherol 50 mg  95+% TLC/98+% GC
1073                     rac-γ-Tocopherol  50 mg  95+% TLC/98+% GC
1790                     δ-Tocopherol        50 mg   95+% TLC/98+% GC
1074           rac-5,7-Dimethyltocol    50 mg  95+% TLC/98+% GC
1797                      Tocol                      50 mg  95+% TLC/98+% GC

References:
1. Ahn, K., et al. (2007) J Biol Chem. 282:809-820
2. Kannappan, R., et al. (2010) J Biol Chem. 285:33520
3. Tan, B., (2005) The Journal of the American Neutricutical Association 8(1):35
4. Kannappan, R., et al. (2012) Genes Nutr. 7:43-52
5. Mangialasche, F., et al. (2012) Neurobiol. Aging 33(10):2282-2290
6. Patel, V., et al. (2011) Indian J Exp Biol. 49(10):732-738
7. Vasanthi, HR., et al. (2011) Curr Pharm Des. 17(21):2170-2175

     Vitamin E consists of four tocopherols and four tocotrienols that demonstrate important and far reaching biological activities.  These essential lipids contain a common chromanol ring and either a saturated (tocopherol) or unsaturated (tocotrienol) side chain.  The eight common vitamin E isoforms (α-, β-, γ-, and δ-tocopherols and α-, β-, γ-, and δ-tocotrienols) are differentiated based on the number and position of methyl groups on the chromanol ring and the presence of a saturated or unsaturated side chain (figure 1 (pg. 2)).  The vitamin E vitamers are commonly found in vegetables, fruits, seeds, nuts, grains and oils, where they exist in various ratios with each other.  The unsaturated side chain in tocotrienols gives them physical properties different from tocopherols, such as an increased ability to cross the cell membrane bilayer (1).  Vitamin E has become well known for its role as an antioxidant, in lowering cholesterol and other lipids, as a neuroprotective and anti-cancer agent, and in cardiovascular disease protection.  Most vitamin E supplements contain (and many studies use) only α-tocopherol; however, several of the above biological effects are mostly or exclusively found in the other vitamers, making it critical for them to be included in future research.  Indeed, the tocotrienols in general may have greater physiological functions than tocopherols (2) and may even be inhibited by an unbalanced excess of α-tocopherol supplements (3).
    Scientists at the MD Anderson Cancer Center wrote an excellent article entitled “Tocotrienols fight cancer by targeting multiple cell signaling pathways” (4).  Here it is suggested that since tumor cells result from dysregulation of multiple genes a drug is needed that will also target multiple genes.  Tocotrienols affect numerous pathways linked with tumorigenesis and thus have potential in both the prevention and treatment of cancer as an active and mild anti-cancer drug.
     A recent report from the Karolinska Institute in Sweden described the neuroprotective activity of tocopherols and tocotrienols (5).  It is indicated that low plasma tocopherol and tocotrienol levels are associated with an increased incidence of mild cognitive impairment and Alzheimer’s disease.  Another report indicates that α-tocotrienol is the most potent neuroprotective form of vitamin E, inhibiting 12-LOX, c-Src, and PLA2, up-regulating MRP1, and inducing arteriogenesis through induction of TIMP1 and decreased activation of MMP2 (6).

     Another beneficial function of tocopherols and tocotrienols is their role in preventing cardiovascular disease.  The tocotrienols particularly have gained eminence recently due to an increased understanding of their antioxidant effects.  Cardioprotective effects of tocotrienols include antagonizing the oxidation of low density lipoproteins, anti-atherosclerotic properties, inhibiting platelet aggregation and monocytes adhesion, and preventing smooth muscle proliferation (7).
    Since its discovery, vitamin E has been shown to be a versatile and potent component of biological systems.  α-Tocopherol has received much praise over the years due to its remarkable functions; now the less prevalent tocopherols and tocotrienols are starting to gain recognition as indispensable components of the vitamin E family.  As Kannappan et al. point out more than 25,000 studies have been conducted on tocopherol while very few studies have considered the role of tocotrienols (4).  
But this is sure to change as more scientists become aware that “The multitargeted role of tocotrienols in most degenerative diseases proves it to be an ideal candidate as a nutraceutical/pharmaceutical agent for useful exploitation” (7).  Matreya is pleased to introduce the full line of highly purified Tocopherols and Tocotrienols along with Tocols as internal standard markers.  We have the capability to produce these compounds in multigram sizes to accommodate your research.

  评论这张
 
阅读(614)| 评论(0)
推荐 转载

历史上的今天

在LOFTER的更多文章

评论

<#--最新日志,群博日志--> <#--推荐日志--> <#--引用记录--> <#--博主推荐--> <#--随机阅读--> <#--首页推荐--> <#--历史上的今天--> <#--被推荐日志--> <#--上一篇,下一篇--> <#-- 热度 --> <#-- 网易新闻广告 --> <#--右边模块结构--> <#--评论模块结构--> <#--引用模块结构--> <#--博主发起的投票-->
 
 
 
 
 
 
 
 
 
 
 
 
 
 

页脚

网易公司版权所有 ©1997-2017