MHI-148 is a near-infrared heptamethacyanine dye with tumor-targeting properties for cancer detection, diagnosis, and research. MHI-148 is immediately taken up and accumulated in lysosomes and mitochondria of tumor cells but not in normal cells.

Physicochemical Properties

Molecular Formula	C42H52BRCLN2O4
Molecular Weight	764.230290412903
Exact Mass	762.279
CAS #	172971-76-5
PubChem CID	45100707
Appearance	Light green to green solid powder
Hydrogen Bond Donor Count	2
Hydrogen Bond Acceptor Count	6
Rotatable Bond Count	15
Heavy Atom Count	50
Complexity	1270
Defined Atom Stereocenter Count	0
SMILES	C(N1C(C(C)(C)C2=CC=CC=C12)=CC=C1CCCC(C=CC2C(C3=CC=CC=C3[N+]=2CCCCCC(=O)O)(C)C)=C1Cl)CCCCC(=O)O.[Br-]
InChi Key	SBSLCJXMLMGYFH-UHFFFAOYSA-N
InChi Code	InChI=1S/C42H51ClN2O4.BrH/c1-41(2)32-18-9-11-20-34(32)44(28-13-5-7-22-38(46)47)36(41)26-24-30-16-15-17-31(40(30)43)25-27-37-42(3,4)33-19-10-12-21-35(33)45(37)29-14-6-8-23-39(48)49;/h9-12,18-21,24-27H,5-8,13-17,22-23,28-29H2,1-4H3,(H-,46,47,48,49);1H
Chemical Name	6-[(2E)-2-[(2E)-2-[3-[(E)-2-[1-(5-carboxypentyl)-3,3-dimethylindol-1-ium-2-yl]ethenyl]-2-chlorocyclohex-2-en-1-ylidene]ethylidene]-3,3-dimethylindol-1-yl]hexanoic acid;bromide
HS Tariff Code	2934.99.9001
Storage	Powder-20°C 3 years 4°C 2 years In solvent -80°C 6 months -20°C 1 month
Shipping Condition	Room temperature (This product is stable at ambient temperature for a few days during ordinary shipping and time spent in Customs)

Biological Activity

ln Vitro	MHI-148 (10 µM, 1 h) has tumor imaging and targeting properties and is absorbed much higher in HT-29 colon cancer cells than in normal NIH3T3 fibroblasts[1]. In HT-29 and NIH3T3 cells, MHI-148 (0-1.5 µM, 3 days) only slightly damages the cells[1].
References	[1]. Heptamethine Cyanine Dye MHI-148-Mediated Drug Delivery System to Enhance the Anticancer Efficiency of Paclitaxel. Int J Nanomedicine. 2021 Oct 21;16:7169-7180.

Solubility Data

Solubility (In Vitro)

DMSO: 20.83 mg/mL (27.26 mM)

Solubility (In Vivo)

Solubility in Formulation 1: ≥ 1 mg/mL (1.31 mM) (saturation unknown) in 10% DMSO + 40% PEG300 + 5% Tween80 + 45% Saline (add these co-solvents sequentially from left to right, and one by one), clear solution. For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 10.0 mg/mL clear DMSO stock solution to 400 μL of PEG300 and mix evenly; then add 50 μL of Tween-80 to the above solution and mix evenly; then add 450 μL of normal saline to adjust the volume to 1 mL. Preparation of saline: Dissolve 0.9 g of sodium chloride in 100 mL ddH₂ O to obtain a clear solution. Solubility in Formulation 2: ≥ 1 mg/mL (1.31 mM) (saturation unknown) in 10% DMSO + 90% (20% SBE-β-CD in Saline) (add these co-solvents sequentially from left to right, and one by one), clear solution. For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 10.0 mg/mL clear DMSO stock solution to 900 μL of 20% SBE-β-CD physiological saline solution and mix evenly. Preparation of 20% SBE-β-CD in Saline (4°C，1 week): Dissolve 2 g SBE-β-CD in 10 mL saline to obtain a clear solution.  (Please use freshly prepared in vivo formulations for optimal results.)

Preparing Stock Solutions		1 mg	5 mg	10 mg
	1 mM	1.3085 mL	6.5425 mL	13.0851 mL
	5 mM	0.2617 mL	1.3085 mL	2.6170 mL
	10 mM	0.1309 mL	0.6543 mL	1.3085 mL

*Note: Please select an appropriate solvent for the preparation of stock solution based on your experiment needs. For most products, DMSO can be used for preparing stock solutions (e.g. 5 mM, 10 mM, or 20 mM concentration); some products with high aqueous solubility may be dissolved in water directly. Solubility information is available at the above Solubility Data section. Once the stock solution is prepared, aliquot it to routine usage volumes and store at -20°C or -80°C. Avoid repeated freeze and thaw cycles.