Cat. No.: HY-Y0265

Isatin

(Synonyms: Indoline-2,3-dione)

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Isatin (Indoline-2,3-dione) is a potent inhibitor of monoamine oxidase (MAO) with an IC₅₀ of 3 μM. Also binds to central benzodiazepine receptors (IC₅₀ against clonazepam, 123 μM). Also acts as an antagonist of both atrial natriuretic peptide stimulated and nitric oxide-stimulated guanylate cyclase activity. Shows effect on the serotonergic system.

For research use only. We do not sell to patients.

Purity: 99.89%
CAS No.: 91-56-5
Formula: C₈H₅NO₂
Molecular Weight:147.13

Storage:

Powder -20°C, 3 years , 4°C, 2 years ; In solvent -80°C, 6 months , -20°C, 1 month

Isatin Chemical Structure

CAS No.: 91-56-5

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Use of MCE Products

Fluorescent Dye

Strong Fluorescence Signal / Multi-Disciplinary Applications / High Fluorescence Specificity

Biological Activity
- Description
- IC₅₀ & Target
- Cellular Effect
- In Vitro
- In Vivo
Chemical Information
Solvent & Solubility
- In Vitro
- In Vivo
Purity & Documentation
References
Help & FAQs
Classifications
Bioz

Biological Activity

Description

Isatin (Indoline-2,3-dione) is a potent inhibitor of monoamine oxidase (MAO) with an IC₅₀ of 3 μM. Also binds to central benzodiazepine receptors (IC₅₀ against clonazepam, 123 μM)^[1]. Also acts as an antagonist of both atrial natriuretic peptide stimulated and nitric oxide-stimulated guanylate cyclase activity^[2]. Shows effect on the serotonergic system^[3].

IC₅₀ & Target

IC50: 3 μM (MAO B)^[1]

All Monoamine Oxidase Isoforms :

MAO-A
MAO-B

Cellular Effect

Cell Line	Type	Value	Description	References
A549	IC₅₀	13.5 μM Compound: 1	Cytotoxicity against human A549 cells after 48 hrs by MTT assay Cytotoxicity against human A549 cells after 48 hrs by MTT assay	[PMID: 22386528]
BTI-TN-5B1-4	IC₅₀	18.75 μM Compound: Is	Inhibition of human MAO-B expressed in baculovirus infected BTI-TN-5B1-4 cells using p-tyramine as substrate incubated for 15 mins prior to substrate addition measured for 15 mins by Amplex red assay Inhibition of human MAO-B expressed in baculovirus infected BTI-TN-5B1-4 cells using p-tyramine as substrate incubated for 15 mins prior to substrate addition measured for 15 mins by Amplex red assay	[PMID: 23153812]
BTI-TN-5B1-4	IC₅₀	18.75 μM Compound: Is	Inhibition of human MAO-B expressed in baculovirus infected BTI-TN-5B1-4 insect cells using p-tyramine as substrate assessed as hydrogen peroxide production by fluorimetric method Inhibition of human MAO-B expressed in baculovirus infected BTI-TN-5B1-4 insect cells using p-tyramine as substrate assessed as hydrogen peroxide production by fluorimetric method	10.1039/C0MD00014K
BTI-TN-5B1-4	IC₅₀	18.75 μM Compound: Isatin	Inhibition of human recombinant MAOB expressed in baculovirus infected insect BTI-TN-5B1-4 cells assessed as production of hydrogen peroxide from p-tyramine by amplex red assay Inhibition of human recombinant MAOB expressed in baculovirus infected insect BTI-TN-5B1-4 cells assessed as production of hydrogen peroxide from p-tyramine by amplex red assay	[PMID: 20715818]
BTI-TN-5B1-4	IC₅₀	18.75 μM Compound: Isatin	Inhibition of human recombinant MAO-B expressed in baculovirus infected BTI-TN-5B1-4 cells assessed as production of hydrogen peroxide from p-tyramine after 15 mins by microplate fluorescence assay Inhibition of human recombinant MAO-B expressed in baculovirus infected BTI-TN-5B1-4 cells assessed as production of hydrogen peroxide from p-tyramine after 15 mins by microplate fluorescence assay	[PMID: 21872365]
BTI-TN-5B1-4	IC₅₀	18.75 μM Compound: Isatin	Inhibition of human recombinant MAO-B expressed in baculovirus-infected BTI-TN-5B1-4 cell microsomes assessed as decrease in H2O2 production using p-tyramine as substrate preincubated for 15 mins by Amplex Red reagent based fluorimetric method Inhibition of human recombinant MAO-B expressed in baculovirus-infected BTI-TN-5B1-4 cell microsomes assessed as decrease in H2O2 production using p-tyramine as substrate preincubated for 15 mins by Amplex Red reagent based fluorimetric method	[PMID: 24746464]
BTI-TN-5B1-4	IC₅₀	18754 nM Compound: isatin	Inhibition of human recombinant MAOB expressed in baculovirus infected BTI-TN-5B1-4 insect cells assessed as hydrogen peroxide production from p-tyramine by amplex red assay Inhibition of human recombinant MAOB expressed in baculovirus infected BTI-TN-5B1-4 insect cells assessed as hydrogen peroxide production from p-tyramine by amplex red assay	[PMID: 20579890]
BTI-TN-5B1-4	IC₅₀	34.39 μM Compound: Isatin	Inhibition of human recombinant microsomal MAO-B expressed in baculovirus infected BTI-TN-5B1-4 cells using p-tyramine as substrate assessed as reduction in H2O2 production preincubated for 15 mins followed by substrate addition measured for 15 mins Ample Inhibition of human recombinant microsomal MAO-B expressed in baculovirus infected BTI-TN-5B1-4 cells using p-tyramine as substrate assessed as reduction in H2O2 production preincubated for 15 mins followed by substrate addition measured for 15 mins Ample	[PMID: 27135371]
BTI-TN-5B1-4	IC₅₀	40 μM Compound: Isatin	Inhibition of human recombinant MAOA expressed in baculovirus infected insect BTI-TN-5B1-4 cells assessed as production of hydrogen peroxide from p-tyramine by amplex red assay Inhibition of human recombinant MAOA expressed in baculovirus infected insect BTI-TN-5B1-4 cells assessed as production of hydrogen peroxide from p-tyramine by amplex red assay	[PMID: 20715818]
HepG2	IC₅₀	>10 μM Compound: 1a	Cytotoxicity against human HepG2 cells after 48 hrs by MTT assay Cytotoxicity against human HepG2 cells after 48 hrs by MTT assay	[PMID: 24360564]
HepG2	IC₅₀	>10 μM Compound: 1a	Antiproliferative activity against human HepG2 cells after 48 hrs by MTT assay Antiproliferative activity against human HepG2 cells after 48 hrs by MTT assay	[PMID: 30055465]
HT-29	IC₅₀	>10 μM Compound: 1a	Cytotoxicity against human HT-29 cells after 48 hrs by MTT assay Cytotoxicity against human HT-29 cells after 48 hrs by MTT assay	[PMID: 24360564]
Jurkat	IC₅₀	>10 μM Compound: 1a	Anticancer activity against human Jurkat cells after 48 hrs by MTT assay Anticancer activity against human Jurkat cells after 48 hrs by MTT assay	[PMID: 26890120]
K562	IC₅₀	>10 μM Compound: 1a	Cytotoxicity against human K562 cells after 48 hrs by MTT assay Cytotoxicity against human K562 cells after 48 hrs by MTT assay	[PMID: 24360564]
K562	IC₅₀	>10 μM Compound: 1a	Antiproliferative activity against human K562 cells after 48 hrs by MTT assay Antiproliferative activity against human K562 cells after 48 hrs by MTT assay	[PMID: 30055465]
KB 3-1	IC₅₀	>50 μM Compound: 8	Cytotoxicity against human P-gp-negative KB-3-1 cells after 72 hrs by MTT assay Cytotoxicity against human P-gp-negative KB-3-1 cells after 72 hrs by MTT assay	[PMID: 19397322]
KB-V1	IC₅₀	>50 μM Compound: 8	Cytotoxicity against human P-glycoprotein-expressing KBV1 cells after 72 hrs by MTT assay Cytotoxicity against human P-glycoprotein-expressing KBV1 cells after 72 hrs by MTT assay	[PMID: 19397322]
MDA-MB-231	IC₅₀	>100 μM Compound: 1	Cytotoxicity against human MDA-MB-231 cells after 48 hrs by MTT assay Cytotoxicity against human MDA-MB-231 cells after 48 hrs by MTT assay	[PMID: 22386528]
MRC5	IC₅₀	>100 μM Compound: 1	Cytotoxicity against human MRC5 cells after 48 hrs by MTT assay Cytotoxicity against human MRC5 cells after 48 hrs by MTT assay	[PMID: 22386528]
SK-N-SH	IC₅₀	9.84 μM Compound: 1	Cytotoxicity against human SK-N-SH cells after 48 hrs by MTT assay Cytotoxicity against human SK-N-SH cells after 48 hrs by MTT assay	[PMID: 22386528]
U-937	IC₅₀	565 μM Compound: 2a	Cytotoxicity against human U937 cells Cytotoxicity against human U937 cells	[PMID: 17088067]
U-937	IC₅₀	565 μM Compound: isatin	Cytotoxicity against human U937 cells Cytotoxicity against human U937 cells	[PMID: 21306903]

In Vitro

In dopaminergic SH-SY5Y cells isatin (1-400 μM) induces cell death in dose- and time dependent manner. This death occurred as a continuum of survival, apoptosis and necrosis^[2].

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

In Vivo

A single dose of isatin (80 mg/kg) has a rapid effect on the serotonergic system in the hypothalamus. Isatin significantly increases 5-HT concentrations in the hypothalamus and cortex but did not significantly alter 5-HIAA concentrations^[3].

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

Chemical Information

CAS No. 91-56-5
Appearance Solid
Molecular Weight 147.13
Formula C₈H₅NO₂
Color Yellow to orange
SMILES

O=C1NC2=C(C=CC=C2)C1=O
Synonyms

Indoline-2,3-dione
Structure Classification
- Alkaloids
- Indole Alkaloids
Initial Source
- Plants
- other families
Shipping

Room temperature in continental US; may vary elsewhere.

Storage

Powder	-20°C	3 years
	4°C	2 years
In solvent	-80°C	6 months
	-20°C	1 month

Solvent & Solubility

In Vitro:

DMSO : 100 mg/mL (679.66 mM; Need ultrasonic; Hygroscopic DMSO has a significant impact on the solubility of product, please use newly opened DMSO)

H₂O : < 0.1 mg/mL (insoluble)

View the Complete Stock Solution Preparation Table

Preparing Stock Solutions

View the Complete Stock Solution Preparation Table

Concentration Solvent Mass

1 mg

5 mg

10 mg

Concentration

Solvent

Mass

1 mM

6.7966 mL

33.9829 mL

67.9657 mL

5 mM

1.3593 mL

6.7966 mL

13.5931 mL

10 mM

0.6797 mL

3.3983 mL

6.7966 mL

Please refer to the solubility information to select the appropriate solvent. Once prepared, please aliquot and store the solution to prevent product inactivation from repeated freeze-thaw cycles.

Storage method and period of stock solution: -80°C, 6 months; -20°C, 1 month. When stored at -80°C, please use it within 6 months. When stored at -20°C, please use it within 1 month.

Molarity Calculator

Mass (g) = Concentration (mol/L) × Volume (L) × Molecular Weight (g/mol)

Mass Mass

Concentration Concentration

Volume Volume

Molecular Weight Molecular Weight

Dilution Calculator

Concentration _(start) × Volume _(start) = Concentration _(final) × Volume _(final)

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In Vivo:

Select the appropriate dissolution method based on your experimental animal and administration route.

Stock Solution Working Solution

For the following dissolution methods, please ensure to first prepare a clear stock solution using an In Vitro approach and then sequentially add co-solvents:
To ensure reliable experimental results, the clarified stock solution can be appropriately stored based on storage conditions. As for the working solution for In Vivo experiments, it is recommended to prepare freshly and use it on the same day.
The percentages shown for the solvents indicate their volumetric ratio in the final prepared solution. If precipitation or phase separation occurs during preparation, heat and/or sonication can be used to aid dissolution.

Protocol 1

Add each solvent one by one: 10% DMSO 40% PEG300 5% Tween-80 45% Saline

Solubility: ≥ 2 mg/mL (13.59 mM); Clear solution

This protocol yields a clear solution of ≥ 2 mg/mL (saturation unknown).

Taking 1 mL working solution as an example, add 100 μL DMSO stock solution (20.0 mg/mL) to 400 μL PEG300, and mix evenly; then add 50 μL Tween-80 and mix evenly; then add 450 μL Saline to adjust the volume to 1 mL.

Protocol 2

Add each solvent one by one: 10% DMSO 90% (20% SBE-β-CD in Saline)

Solubility: ≥ 2 mg/mL (13.59 mM); Clear solution

This protocol yields a clear solution of ≥ 2 mg/mL (saturation unknown).

Taking 1 mL working solution as an example, add 100 μL DMSO stock solution (20.0 mg/mL) to 900 μL 20% SBE-β-CD in Saline, and mix evenly.

In Vivo Dissolution Calculator

Please enter the basic information of animal experiments:

Dosage Dosage
mg/kg
Animal Weight (Per Animal) Animal Weight (Per Animal)
g
Dosing Volume (Per Animal) Dosing Volume (Per Animal)
μL
Number of Animals Number of Animals

Recommended: Prepare an additional quantity of animals to account for potential losses during experiments.

Recommended: Prepare an additional quantity of animals to account for potential losses during experiments.

Please enter your animal formula composition:

%
DMSO +

Recommended: Keep the proportion of DMSO in working solution below 2% if your animal is weak.
%
+
+
%
Tween-80 + +
%
Saline +

The co-solvents required include: DMSO, . All of co-solvents are available by MedChemExpress (MCE). , Tween 80. All of co-solvents are available by MedChemExpress (MCE).

Working solution concentration: 0.22 mg/mL

Purity & Documentation

Select Batch:

Purity: 99.98%

Assay: 99.98%

ee.: 99.98%

Data Sheet (276 KB)
SDS (393 KB)
- English - EN (393 KB)
- Français - FR (393 KB)
- Deutsch - DE (393 KB)
- Norwegian - NO (393 KB)
- Español - ES (393 KB)
- Swedish - SV (393 KB)
- Italian - IT (393 KB)
- Korean - KR (393 KB)
- Portuguese - PT (393 KB)
COA (2659 KB)
Elemental Analysis Report (2659 KB)
HNMR (2659 KB)
CNMR (2659 KB)
RP-HPLC (2659 KB)
NP-HPLC (2659 KB)
MS (2659 KB)
LCMS (2659 KB)
IR (2659 KB)
GC (2659 KB)
OR (2659 KB)
SDS-PAGE (2659 KB)
SEC-HPLC (2659 KB)
Other Report (2659 KB)
Handling Instructions (2659 KB)

References

[1]. Glover V, et al. Isatin: Identity with the Purified Endogenous Monoamine Oxidase Inhibitor Tribulin. Journal of Neurochemistry, 51(2), 656–659.

[2]. Igosheva N, et al. Isatin, an endogenous monoamine oxidase inhibitor, triggers a dose- and time-dependent switch from apoptosis to necrosis in human neuroblastoma cells. Neurochem Int. 2005 Aug;47(3):216-24. [Content Brief]

[3]. McIntyre IM, et al. Serotonergic effects of isatin: an endogenous MAO inhibitor related to tribulin. J Neural Transm Gen Sect. 1990;79(1-2):35-40. [Content Brief]

Help & FAQs

How should lyophilized recombinant proteins be reconstituted and stored?

1. Before opening the cap, centrifuge the vial at 13000 rpm for 20-30 seconds. This step will ensure that any lyophilized powder that may have adhered to the cap or walls is collected at the bottom of the vial, minimizing the risk of product loss.

Complete Stock Solution Preparation Table

Storage method and period of stock solution: -80°C, 6 months; -20°C, 1 month. When stored at -80°C, please use it within 6 months. When stored at -20°C, please use it within 1 month.

Optional Solvent	Concentration Solvent Mass	1 mg	5 mg	10 mg	25 mg
DMSO	1 mM	6.7966 mL	33.9829 mL	67.9657 mL	169.9143 mL
	5 mM	1.3593 mL	6.7966 mL	13.5931 mL	33.9829 mL
	10 mM	0.6797 mL	3.3983 mL	6.7966 mL	16.9914 mL
	15 mM	0.4531 mL	2.2655 mL	4.5310 mL	11.3276 mL
	20 mM	0.3398 mL	1.6991 mL	3.3983 mL	8.4957 mL
	25 mM	0.2719 mL	1.3593 mL	2.7186 mL	6.7966 mL
	30 mM	0.2266 mL	1.1328 mL	2.2655 mL	5.6638 mL
	40 mM	0.1699 mL	0.8496 mL	1.6991 mL	4.2479 mL
	50 mM	0.1359 mL	0.6797 mL	1.3593 mL	3.3983 mL
	60 mM	0.1133 mL	0.5664 mL	1.1328 mL	2.8319 mL
	80 mM	0.0850 mL	0.4248 mL	0.8496 mL	2.1239 mL
	100 mM	0.0680 mL	0.3398 mL	0.6797 mL	1.6991 mL

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Isatin

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All Monoamine Oxidase Isoforms

Biological Activity

Chemical Information

Solvent & Solubility

Purity & Documentation

References

Help & FAQs

Complete Stock Solution Preparation Table

Isatin Related Classifications

HY-Y0265 Related Classifications