ChemFaces is a professional high-purity natural products manufacturer.
Product Intended Use
1. Reference standards
2. Pharmacological research
How to Order
Orders via your E-mail:
1. Product number / Name / CAS No.
2. Delivery address
3. Ordering/billing address
4. Contact information
Sent to Email: firstname.lastname@example.org
Order & Inquiry & Tech Support
Address: No. 83, CheCheng Rd., WETDZ, Wuhan, Hubei 430056, PRC
Delivery & Payment method
1. Usually delivery time: Next day delivery by 9:00 a.m. Order now
2. We accept: Wire transfer & Credit card & Paypal & Western Union
* Packaging according to customer requirements(5mg, 10mg, 20mg and more). We shipped via FedEx, DHL, UPS, EMS and others courier.
More articles cited ChemFaces products.
Journal of Analytical ChemistryAug. 2017;J Ethnopharmacol. 2017 Feb 23;Phytother Res. 2016 Dec;Appl Microbiol Biotechnol. 2015 Dec 21. Ajchem JournalJAN. 2014
Food and Bioprocess TechnologyJune 2017J Ethnopharmacol. 2016 Jul 12.The Korea Society of Pharmacognosy.2014The Korea Society of Pharmacognosy.2014Proc Natl Acad Sci U S A. 2016 Jul 26;
University of Limpopo2016Invest New Drugs. 2017 Apr;J Sep Sci. 2017 Dec 27.Journal of Functional FoodsMarch 2017
Our products had been exported to the following research institutions and universities, And still growing.
University of Medicine and Pharm... (Romania)Yale University (USA)Universidad de La Salle (Mexico)Johannes Gutenberg University Ma... (Germany)
Charles Sturt University (Denmark)University of Maryland School of... (USA)Universidad de Buenos Aires (Argentina)Universite de Lille1 (France)
Shanghai Institute of Organic Ch... (China)Ain Shams University (Egypt)Charles University in Prague (Czech Republic)
||Hypoxanthine, a purine derivative, is a potential free radical generator and could be used as an indicator of hypoxia.Hypoxanthine inhibits mouse oocyte maturation, it plays a role in vivo in maintaining meiotic arrest. |
|Dev Biol. 1987 Feb;119(2):313-21. |
|The effect of hypoxanthine on mouse oocyte growth and development in vitro: maintenance of meiotic arrest and gonadotropin-induced oocyte maturation.[Pubmed: 3100361]|
|The concentration of Hypoxanthine in mouse follicular fluid has been estimated to be 2-4 mM, and although this concentration maintains meiotic arrest in fully grown mouse oocytes in vitro, oocyte maturation in vivo is not induced by a decrease in the concentration of this purine in follicular fluid (J. J. Eppig, P. F. Ward-Bailey, and D. L. Coleman, Biol. Reprod. 33, 1041-1049, 1985). |
METHODS AND RESULTS:
In the present study, the effect of 2 mM Hypoxanthine on oocyte growth and development in vitro was assessed and the ability of gonadotropins to stimulate oocyte maturation in the continued presence of Hypoxanthine was determined. Oocyte-granulosa cell complexes were isolated from 10- to 11-day-old mice and cultured in the presence or absence of 2 mM Hypoxanthine. Oocytes from 10- to 11-day-old mice are in mid-growth phase and, without further development, are incompetent of undergoing meiotic maturation. During a 12-day culture period the granulosa cell-enclosed oocytes approximately doubled in size and, regardless of the presence or absence of Hypoxanthine, 50-70% developed competence to undergo germinal vesicle breakdown (GVBD). Hypoxanthine promoted the continued association of oocytes with their companion granulosa cells during the 12-day culture period, and therefore had a beneficial effect on oocyte development. Most of the oocytes that acquired GVBD competence in the absence of Hypoxanthine underwent spontaneous GVBD. In contrast, 95% of the GVBD-competent oocytes were maintained in meiotic arrest by Hypoxanthine. Following withdrawal of the Hypoxanthine after the 12-day culture, 75% of the GVBD-competent oocytes underwent GVBD.
These results show that Hypoxanthine, and/or its metabolites, maintains meiotic arrest in oocytes that grow and acquire GVBD competence in vitro. Follicle-stimulating hormone (FSH), but not luteinizing hormone or human chorionic gonadotropin, induced oocyte GVBD in the continued presence of Hypoxanthine. FSH stimulated oocyte maturation at a significantly (P less than 0.01) higher frequency than coculture of the granulosa cell-denuded oocytes with granulosa cells in the continued presence of Hypoxanthine. FSH did not induce the maturation of denuded oocytes cocultured with granulosa cells.
|Proceedings of the National Academy of Sciences of the United States of America, 1985, 82(2):454-8. |
|Hypoxanthine is the principal inhibitor of murine oocyte maturation in a low molecular weight fraction of porcine follicular fluid.[Reference: WebLink]|
|Studies were carried out to identify and quantify the porcine follicular fluid (PFF) component(s) responsible for inhibition of murine oocyte maturation. |
METHODS AND RESULTS:
A low molecular weight fraction of PFF (less than 1000) was prepared by dialysis and used in all experiments. This PFF fraction contained an inhibitor(s) of mouse oocyte maturation that absorbed maximally in the ultraviolet (UV) range at 250-260 nm. When the PFF fraction was charcoal-extracted, significant loss of absorbance at 250, 260, and 280 nm resulted, which corresponded to loss of inhibitory activity. Four major components of PFF were separated by ion-exchange chromatography and characterized according to their UV spectral characteristics and inhibitory activity. When individual fractions demonstrating identical spectra were pooled and analyzed by high-performance liquid chromatography, the first pooled fraction (A) was found to be impure, but adenine comprised 80% of the UV-absorbing material. Fractions B, C, and D were characterized as pure uracil, Hypoxanthine, and 7-methylinosine, respectively. The concentrations of these compounds in PFF were estimated to be 0.06 mM adenine, 0.44 mM uracil, 1.41 mM Hypoxanthine, and 0.19 mM 7-methylinosine. Comparison of the potencies of commercial preparations of these compounds established that Hypoxanthine is the major inhibitory component of the low molecular weight PFF fraction. Moreover, a commercial preparation of Hypoxanthine mimicked the action of PFF on mouse oocyte maturation in that it produced a transient inhibition of oocyte maturation that was significantly potentiated by follicle-stimulating hormone and dibutyryl cyclic adenosine monophosphate. When the inhibitory efficacies of purine and pyrimidine bases and nucleosides were compared, their relative potencies in decreasing order were purine bases greater than purine nucleosides greater than pyrimidine bases = pyrimidine nucleosides.
We conclude that Hypoxanthine is the predominant low molecular weight component of PFF that inhibits mouse oocyte maturation but that other purines/pyrimidines may also play a role in vivo in maintaining meiotic arrest.
||From porcine follicular fluid.
||Chloroform, Dichloromethane, Ethyl Acetate, DMSO, Acetone, etc.
||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
||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.
Recent ChemFaces New Products and Compounds
Recently, ChemFaces products have been cited in many studies from excellent and top scientific journals
Cell. 2018 Jan 11;172(1-2):249-261.e12. doi: 10.1016/j.cell.2017.12.019.PMID: 29328914
Mol Cell. 2017 Nov 16;68(4):673-685.e6. doi: 10.1016/j.molcel.2017.10.022.PMID: 29149595
Scientific Reports 2017 Dec 11;7(1):17332.doi: 10.1038/s41598-017-17427-6.PMID: 29230013
Molecules. 2017 Oct 27;22(11). pii: E1829.doi: 10.3390/molecules22111829.PMID: 29077044
J Cell Biochem. 2018 Feb;119(2):2231-2239.doi: 10.1002/jcb.26385. PMID: 28857247
Phytomedicine. 2018 Feb 1;40:37-47. doi:10.1016/j.phymed.2017.12.030PMID: 29496173
Calculate Dilution Ratios(Only for Reference)
* Note: If you are in the process of experiment, it's need to make the dilution ratios of the samples. The dilution data of the sheet for your reference. Normally, it's can get a better solubility within lower of Concentrations.
|Pediatric Research, 1988, 23(2):143-50. |
|Hypoxanthine as an Indicator of Hypoxia: Its Role in Health and Disease through Free Radical Production[Reference: WebLink]|
|Hypoxia is a common insult during the perinatal and neonatal period. New a n d better ways t o evaluate hypoxia are needed. |
METHODS AND RESULTS:
In 1975 we demonstrated high concentrations of the purine metab- olite Hypoxanthine in umbilical cord plasma after intrauterine hypoxia a n d proposed that Hypoxanthine could be used as a n indicator of hypoxia (1). Since then a large number of studies have been published dealing with different aspects of hypoxan- thine in hypoxia.