Science | Nature | Cell | View More
Natural Products
Questin
ChemFaces products have been cited in many studies from excellent and top scientific journals
Product Name Questin
Price:
CAS No.: 3774-64-9
Catalog No.: CFN89155
Molecular Formula: C16H12O5
Molecular Weight: 284.26 g/mol
Purity: >=98%
Type of Compound: Anthraquinones
Physical Desc.: Powder
Source: The seeds of Cassia obtusifolia.
Solvent: Chloroform, Dichloromethane, Ethyl Acetate, DMSO, Acetone, etc.
Download: COA    MSDS
Similar structural: Comparison (Web)  (SDF)
Guestbook:
Contact Us
Order & Inquiry & Tech Support

Tel: (0086)-27-84237683
Tech: service@chemfaces.com
Order: manager@chemfaces.com
Address: 176, CheCheng Eest Rd., WETDZ, Wuhan, Hubei 430056, PRC
How to Order
Orders via your E-mail:

1. Product number / Name / CAS No.
2. Delivery address
3. Ordering/billing address
4. Contact information
Order: manager@chemfaces.com
Delivery time
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
Citing Use of our Products
* Packaging according to customer requirements(5mg, 10mg, 20mg and more). We shipped via FedEx, DHL, UPS, EMS and others courier.
According to end customer requirements, ChemFaces provide solvent format. This solvent format of product intended use: Signaling Inhibitors, Biological activities or Pharmacological activities.
Size /Price /Stock 10 mM * 1 mL in DMSO / Inquiry
Other Packaging *Packaging according to customer requirements(100uL/well, 200uL/well and more), and Container use Storage Tube With Screw Cap
Our products had been exported to the following research institutions and universities, And still growing.
  • Mendel University in Brno (Czech Republic)
  • Institute of Chinese Materia Me... (China)
  • John Innes Centre (United Kingdom)
  • The Australian National University (Australia)
  • University of Queensland (Australia)
  • Universite Libre de Bruxelles (Belgium)
  • Ain Shams University (Egypt)
  • University of Amsterdam (Netherlands)
  • Biotech R&D Institute (USA)
  • Center for protein Engineering ... (Belgium)
  • University of Mysore (India)
  • More...
Package
Featured Products
Glucoerucin

Catalog No: CFN00488
CAS No: 15592-37-7
Price: $ / mg
Schisandrol A

Catalog No: CFN99012
CAS No: 7432-28-2
Price: $30/20mg
Corynoxeine

Catalog No: CFN98154
CAS No: 630-94-4
Price: $148/20mg
Didymin

Catalog No: CFN92363
CAS No: 14259-47-3
Price: $80/20mg
Delta 5-avenasterol

Catalog No: CFN92239
CAS No: 18472-36-1
Price: $413/5mg
Terpineol

Catalog No: CFN92688
CAS No: 98-55-5
Price: $30/20mg
Juglanin

Catalog No: CFN96238
CAS No: 5041-67-8
Price: $318/5mg
Iridin

Catalog No: CFN96557
CAS No: 491-74-7
Price: $50/20mg
alpha-Viniferin

Catalog No: CFN97068
CAS No: 62218-13-7
Price: $318/10mg
Nonivamide

Catalog No: CFN90179
CAS No: 2444-46-4
Price: $30/20mg
Related Screening Libraries
Size /Price /Stock 10 mM * 100 uL in DMSO / Inquiry / In-stock
10 mM * 1 mL in DMSO / Inquiry / In-stock
Related Libraries
Biological Activity
Description: Questin has promising inhibitory potential against AChE, BChE, and BACE1, it may be used in the development of therapeutic or preventive agents for Alzheimer's disease. Questin is a Cdc25B phosphatase inhibitor, it inhibited the enzymatic activity of Cdc25B phosphatase with the IC(50) value of 34 microg/mL, it also strongly inhibited the growth of human colon cancer cells, SW620 with the GI(50) value of 0.9 microg/mL. Questin shows considerably high immunosuppressive activity.
Targets: AChR | BChR | NO | Immunology & Inflammation related | Cdc25B phosphatase
In vitro:
PLoS One. 2012;7(2):e29906.
Trypacidin, a spore-borne toxin from Aspergillus fumigatus, is cytotoxic to lung cells.[Pubmed: 22319557 ]
Inhalation of Aspergillus fumigatus conidia can cause severe aspergillosis in immunosuppressed people. A. fumigatus produces a large number of secondary metabolites, some of which are airborne by conidia and whose toxicity to the respiratory tract has not been investigated. We found that spores of A. fumigatus contain five main compounds, tryptoquivaline F, fumiquinazoline C, Questin, monomethylsulochrin and trypacidin.
METHODS AND RESULTS:
Fractionation of culture extracts using RP-HPLC and LC-MS showed that samples containing Questin, monomethylsulochrin and trypacidin were toxic to the human A549 lung cell line. These compounds were purified and their structure verified using NMR in order to compare their toxicity against A549 cells.
CONCLUSIONS:
Trypacidin was the most toxic, decreasing cell viability and triggering cell lysis, both effects occurring at an IC₅₀ close to 7 μM. Trypacidin toxicity was also observed in the same concentration range on human bronchial epithelial cells. In the first hour of exposure, trypacidin initiates the intracellular formation of nitric oxide (NO) and hydrogen peroxide (H₂O₂). This oxidative stress triggers necrotic cell death in the following 24 h. The apoptosis pathway, moreover, was not involved in the cell death process as trypacidin did not induce apoptotic bodies or a decrease in mitochondrial membrane potential. This is the first time that the toxicity of trypacidin to lung cells has been reported.
Nat Prod Res. 2007 May 20;21(6):487-93.
Anthraquinones, Cdc25B phosphatase inhibitors, isolated from the roots of Polygonum multiflorum Thunb.[Pubmed: 17497420]

METHODS AND RESULTS:
Three anthraquinones, Cdc25B phosphatase inhibitors, were isolated from the methanolic extract of the roots of Polygonum multiflorum Thunb. (Polygonaceae).
CONCLUSIONS:
Anthraquinones, physcion (1), emodin (2), and Questin (3), inhibited the enzymatic activity of Cdc25B phosphatase with IC(50) values of 62.5, 30, and 34 microg mL(-1), respectively. Emodin (2) and Questin (3) strongly inhibited the growth of human colon cancer cells, SW620 with GI(50) values of 6.1 and 0.9 microg mL(-1), respectively. Commercially available anthraquinones, chrysophanol (4), and rhein (5) also inhibited Cdc25B phosphatase with IC(50) values of 10.7 and 22.1 microg mL(-1), respectively.
Chem Pharm Bull (Tokyo). 1999 Oct;47(10):1426-32.
Immunomodulatory constituents from an ascomycete, Microascus tardifaciens.[Pubmed: 10553639]

METHODS AND RESULTS:
Fractionation guided by the immunosuppressive activity of the defatted AcOEt extract of an Ascomycete, Microascus tardifaciens, afforded eight constituents, Questin (emodin 8-O-methylether) (1), rubrocristin (2), 5,7-dihydroxy-4-methylphthalide (3), cladosporin (asperentin) (4), cladosporin 8-O-methylether (5), tradioxopiperazine A [cyclo-L-alanyl-5-isopentenyl-2-(1',1'-dimethylallyl)-L-tryptophan] (6), tradioxopiperazine B [cyclo-L-alanyl-7-isopentenyl-2-(1',1'-dimethylallyl)-L-tryptophan] (7), and asperflavin (8), among which 6 and 7 were new compounds.
CONCLUSIONS:
Compounds 1 and 2 showed considerably high immunosuppressive activity, 6 was moderate and, 3, 4, 5, 7 and 8 showed low activity.
Questin Description
Source: The seeds of Cassia obtusifolia.
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: service@chemfaces.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.
ChemFaces New Products and Compounds
Somnifericin

Catalog No: CFN95280
CAS No: 173693-57-7
Price: $318/5mg
1-O-Feruloylglucose

Catalog No: CFN95596
CAS No: 64625-37-2
Price: $413/5mg
Leachianol F

Catalog No: CFN95147
CAS No: 164123-50-6
Price: $318/5mg
Kaempferol 3,4'-di-O-glucoside

Catalog No: CFN95357
CAS No: 71939-16-7
Price: $318/5mg
7-(4-Hydroxyphenyl)-1-phenyl-4-hep...

Catalog No: CFN95140
CAS No: 100667-52-5
Price: $318/5mg
Asiaticoside B

Catalog No: CFN95124
CAS No: 125265-68-1
Price: $158/20mg
Indolelactic acid

Catalog No: CFN95263
CAS No: 1821-52-9
Price: $100/20mg
5-Hydroxy-7-(4'-hydroxy-3'-methoxy...

Catalog No: CFN95135
CAS No: 79559-61-8
Price: $268/20mg
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.
IF=36.216(2019)

PMID: 29328914

Cell Metab. 2020 Mar 3;31(3):534-548.e5.
doi: 10.1016/j.cmet.2020.01.002.
IF=22.415(2019)

PMID: 32004475

Mol Cell. 2017 Nov 16;68(4):673-685.e6.
doi: 10.1016/j.molcel.2017.10.022.
IF=14.548(2019)

PMID: 29149595

ACS Nano. 2018 Apr 24;12(4): 3385-3396.
doi: 10.1021/acsnano.7b08969.
IF=13.903(2019)

PMID: 29553709

Nature Plants. 2016 Dec 22;3: 16206.
doi: 10.1038/nplants.2016.205.
IF=13.297(2019)

PMID: 28005066

Sci Adv. 2018 Oct 24;4(10): eaat6994.
doi: 10.1126/sciadv.aat6994.
IF=12.804(2019)

PMID: 30417089
Calculate Dilution Ratios(Only for Reference)
1 mg 5 mg 10 mg 20 mg 25 mg
1 mM 3.5179 mL 17.5895 mL 35.1791 mL 70.3581 mL 87.9477 mL
5 mM 0.7036 mL 3.5179 mL 7.0358 mL 14.0716 mL 17.5895 mL
10 mM 0.3518 mL 1.759 mL 3.5179 mL 7.0358 mL 8.7948 mL
50 mM 0.0704 mL 0.3518 mL 0.7036 mL 1.4072 mL 1.759 mL
100 mM 0.0352 mL 0.1759 mL 0.3518 mL 0.7036 mL 0.8795 mL
* 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.
Protocol
Kinase Assay:
J Ethnopharmacol. 2016 Sep 15;191:152-160.
Inhibitory activities of major anthraquinones and other constituents from Cassia obtusifolia against β-secretase and cholinesterases.[Pubmed: 27321278 ]

METHODS AND RESULTS:
In vitro enzyme assays demonstrated that C. obtusifolia and its major constituents have promising inhibitory potential against AChE, BChE, and BACE1. All Cassiae semen constituents exhibited potent inhibitory activities against AChE and BACE1 with IC50 values of 6.29-109μg/mL and 0.94-190μg/mL, whereas alaternin, Questin, and toralactone gentiobioside exhibited significant inhibitory activities against BChE with IC50 values of 113.10-137.74μg/mL. Kinetic study revealed that alaternin noncompetitively inhibited, whereas cassiaside and emodin showed mixed-type inhibition against BACE1. Furthermore, molecular docking simulation results demonstrated that hydroxyl group of alaternin and emodin tightly interacted with the active site residues of BACE1 and their relevant binding energies (-6.62 and -6.89kcal/mol), indicating a higher affinity and tighter binding capacity of these compounds for the active site of BACE1.
CONCLUSIONS:
The findings of the present study suggest the potential of C. obtusifolia and its major constituents for use in the development of therapeutic or preventive agents for AD, especially through inhibition of AChE, BChE and BACE1 activities.
Glucoerucin

Catalog No: CFN00488
CAS No: 15592-37-7
Price: $ / mg
Schisandrol A

Catalog No: CFN99012
CAS No: 7432-28-2
Price: $30/20mg
Corynoxeine

Catalog No: CFN98154
CAS No: 630-94-4
Price: $148/20mg
Didymin

Catalog No: CFN92363
CAS No: 14259-47-3
Price: $80/20mg
Delta 5-avenasterol

Catalog No: CFN92239
CAS No: 18472-36-1
Price: $413/5mg
Terpineol

Catalog No: CFN92688
CAS No: 98-55-5
Price: $30/20mg
Juglanin

Catalog No: CFN96238
CAS No: 5041-67-8
Price: $318/5mg
Iridin

Catalog No: CFN96557
CAS No: 491-74-7
Price: $50/20mg
alpha-Viniferin

Catalog No: CFN97068
CAS No: 62218-13-7
Price: $318/10mg
Nonivamide

Catalog No: CFN90179
CAS No: 2444-46-4
Price: $30/20mg
Tags: buy Questin | Questin supplier | purchase Questin | Questin cost | Questin manufacturer | order Questin | Questin distributor