Questin
Based on 1 Customer Validation
Questin is an anthraquinone compound and antibacterial agent. Questin can be isolated from marine-derived fungi and plants. Questin inhibits Cdc25B phosphatase. Questin exhibits antibacterial activity against V. harveyi, V. anguillarum, V. cholerae, and V. parahemolyticus with MIC values of 31.25 µg/mL, 62.5 µg/mL, 62.5 µg/mL, and 125 µg/mL. Questin displays antiprotozoal activity against the animal protozoan pathogen Tritrichomonas foetus, with a MIC of 12.5 µg/mL. Questin has anticancer activity against lung and colon cancer.
For research use only. We do not sell to patients.
- Purity : 97.75%
- CAS No.: 3774-64-9
- Formula: C16H12O5
- Molecular Weight:284.26
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Storage:
4°C, protect from light
* In solvent : -80°C, 6 months; -20°C, 1 month (protect from light)
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Tel: 609-228-6898 E-mail: [email protected] [email protected]
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Biological Activity
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Chemical Information
- Protocols
- Purity & Documentation
- References
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Help & FAQs
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Biological Activity
Description
In Vitro
Questin exhibits antibacterial activity against V. harveyi, V. anguillarum, V. cholerae, and V. parahemolyticus with MIC values of 31.25 µg/mL, 62.5 µg/mL, 62.5 µg/mL, and 125 µg/mL, respectively[1].
Questin (48 h) strongly inhibits the growth of human colon cancer cells (SW620), with a GI50 value of 0.9 mg/mL[2].
Questin (50-100 μM; 24 h) shows certain toxicity to the human A549 lung cell line and reduces cell viability[3].
Questin displays a moderate level of selective antiprotozoal activity against the animal protozoan pathogen Tritrichomonas foetus, with a MIC of 12.5 µg/mL[5].
MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only. Further protocols information, click here.
Chemical Information
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CAS No. 3774-64-9
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Appearance Solid
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Molecular Weight 284.26
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Formula C16H12O5
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Color Yellow to orange
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SMILES
O=C1C2=C(C=C(O)C=C2OC)C(C3=CC(C)=CC(O)=C13)=O
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Structure Classification
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Initial Source
marine-derived Aspergillus flavipes?HN4-13
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Shipping
Room temperature in continental US; may vary elsewhere.
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Storage
4°C, protect from light
* In solvent : -80°C, 6 months; -20°C, 1 month (protect from light)
Protocols
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Research Protocol for Infectious Diseases
Infectious-disease experiments test how pathogens interact with host barriers, innate immune receptors, inflammatory signaling, pathogen replication, and tissue injury; pattern-recognition receptors such as TLRs, RIG-I-like receptors, NOD-like receptors, and inflammasomes detect microbial molecules and activate NF-κB, interferon, and cytokine responses. The central hypothesis is that infection severity reflects the balance between pathogen burden and host response: protective inflammation restricts pathogen growth, whereas excessive or mislocalized inflammation contributes to tissue damage and disease phenotype. Unresolved questions include which host pathways are protective versus pathogenic, why some infection models fail to translate to human disease, and which combined readouts best predict clinically relevant infection outcomes.
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Bacterial live/dead nucleic-acid viability staining
The LIVE/DEAD bacterial viability staining method is based on differential permeability of nucleic-acid-binding fluorescent dyes, most commonly SYTO 9 and propidium iodide (PI), which enables discrimination of bacterial populations with intact versus compromised cytoplasmic membranes. SYTO 9 penetrates both intact and damaged bacterial membranes and binds nucleic acids to produce green fluorescence, whereas propidium iodide penetrates only cells with compromised membranes and fluoresces red while also reducing SYTO 9 signal through competitive binding and fluorescence interactions. The resulting fluorescence pattern is interpreted as a proxy for membrane integrity, which is widely used as an indicator of bacterial viability in microscopy, flow cytometry, and spectroscopic platforms. However, mechanistic studies show that SYTO 9 and PI interactions involve displacement and fluorescence resonance energy transfer effects, which can influence signal interpretation depending on dye ratios a
Purity & Documentation
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Data Sheet (271 KB)
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SDS (252 KB)
- English - EN (252 KB)
- Français - FR (252 KB)
- Deutsch - DE (252 KB)
- Norwegian - NO (252 KB)
- Español - ES (252 KB)
- Swedish - SV (252 KB)
- Italian - IT (252 KB)
- Korean - KR (252 KB)
- Portuguese - PT (252 KB)
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Handling Instructions (2659 KB)
References
[1]. Lei Guo, et al. Optimized production and isolation of antibacterial agent from marine Aspergillus flavipes against Vibrio harveyi. 3 Biotech. 2017 Dec;7(6):383. [Content Brief]
[2]. Choi SG, et al. Anthraquinones, Cdc25B phosphatase inhibitors, isolated from the roots of Polygonum multiflorum Thunb. Nat Prod Res. 2007 May 20;21(6):487-93. [Content Brief]
[3]. Gauthier T, et al. Trypacidin, a spore-borne toxin from Aspergillus fumigatus, is cytotoxic to lung cells. PLoS One. 2012;7(2):e29906. [Content Brief]
[4]. Liu N, et al. Structurally diverse sesquiterpenoids and polyketides from a sponge-associated fungus Aspergillus sydowii SCSIO41301. Fitoterapia. 2019 Jun;135:27-32. [Content Brief]
[5]. Chaudhary NK, et al. Banksialactones and Banksiamarins: Isochromanones and Isocoumarins from an Australian Fungus, Aspergillus banksianus. J Nat Prod. 2018 Jul 27;81(7):1517-1526. [Content Brief]
Calculators
Concentration (start) × Volume (start) = Concentration (final) × Volume (final)
Questin Related Classifications
HY-137990 Related Classifications
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