|Source:||The herbs of Crepis crocea.|
|Biological Activity or Inhibitors:||1. Methyl para-hydroxyphenyllactate(MeHPLA) can suppress the cellular proliferation of estrogen-sensitive MCF-7 breast cancer cells in vitro and to suppress the growth of rat uteri in vivo, high affinity of MeHPLA for the type II estrogen binding site (EBS) suggests that this interaction is responsible for the observed suppression of cell growth.
|Solvent:||Chloroform, Dichloromethane, Ethyl Acetate, DMSO, Acetone, etc.|
|Storage:||Providing storage is as stated on the product vial and the vial is kept tightly sealed, the product can be stored for up to 24 months(2-8C).
Wherever possible, you should prepare and use solutions on the same day. However, if you need to make up stock solutions in advance, we recommend that you store the solution as aliquots in tightly sealed vials at -20C. Generally, these will be useable for up to two weeks. Before use, and prior to opening the vial we recommend that you allow your product to equilibrate to room temperature for at least 1 hour.
Need more advice on solubility, usage and handling? Please email to: email@example.com
|After receiving:||The packaging of the product may have turned upside down during transportation, resulting in the natural compounds adhering to the neck or cap of the vial. take the vial out of its packaging and gently shake to let the compounds fall to the bottom of the vial. for liquid products, centrifuge at 200-500 RPM to gather the liquid at the bottom of the vial. try to avoid loss or contamination during handling.|
|1 mg||5 mg||10 mg||20 mg||25 mg|
|1 mM||5.0968 mL||25.4842 mL||50.9684 mL||101.9368 mL||127.421 mL|
|5 mM||1.0194 mL||5.0968 mL||10.1937 mL||20.3874 mL||25.4842 mL|
|10 mM||0.5097 mL||2.5484 mL||5.0968 mL||10.1937 mL||12.7421 mL|
|50 mM||0.1019 mL||0.5097 mL||1.0194 mL||2.0387 mL||2.5484 mL|
|100 mM||0.051 mL||0.2548 mL||0.5097 mL||1.0194 mL||1.2742 mL|
Zhongguo Zhong Yao Za Zhi. 2015 Oct;40(19):3800-4.
|Chemical constituents from Crepis crocea.[Pubmed: 26975105]|
|Thirteen compounds were isolated from the ethyl acetate fraction of Crepis crocea by column chromatographies on silica gel, Sephadex LH-20 and semi-preparative HPLC. The structures were elucidated on the basis of spectral analysis as tectorone I (1), 8β- (2-methyl- 2-hydroxy-3-oxobutanoyloxy) -glucozaluzanin C (2), tectoroside (3), luteolin-7-O-glucoside (4), cosmosiin (5), esculetin (6), 3,4-dihydroxybenzaldehyde (7), trans-4-hydroxycinnamic acid (8), Caffeic acid (9), Methyl p-hydroxyphenyllactate (10), ethylp- hydroxyphenyllactate (11), cis-3,4-dihydroxy-β-ionion (12). All the compounds, except for compounds 4 and 9, were isolated from this plant for the first time, and tectorone I (1) is a new natural product.|
Chirality. 2003 Oct;15(8):674-9.
|Type II estrogen binding site agonist: synthesis and biological evaluation of the enantiomers of methyl-para-hydroxyphenyllactate (MeHPLA).[Pubmed: 12923805 ]|
|A high-affinity ligand for the type II estrogen binding site (EBS) was identified. Methyl para-hydroxyphenyllactate (Methyl p-hydroxyphenyllactate,MeHPLA) was observed to suppress the cellular proliferation of estrogen-sensitive MCF-7 breast cancer cells in vitro and to suppress the growth of rat uteri in vivo. The high affinity of MeHPLA for the type II EBS suggests that this interaction is responsible for the observed suppression of cell growth. In this study, the enantiomers of MeHPLA were synthesized and separated by three methods and evaluated for biological activity. When the methods were compared, it was found that the method using an optically pure amine to form the diastereomers of the enantiomers gave the superior yield. Binding studies for the enantiomers to the type II EBS showed that the S-MeHPLA had a higher affinity for the binding site. However, higher binding affinity did not translate into superior cell growth suppression. Both enantiomers suppressed cell growth equally.|