Trimethoprim lactate

Name: Trimethoprim lactate
Brand: MedChemExpress
SKU: HY-B0510C
Rating: 5.0 (11 reviews)

Cat. No.: HY-B0510C Purity: 99.90%: Data Sheet
COA

SDS
Handling Instructions
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Trimethoprim lactate is a bacteriostatic antibiotic and an orally active dihydrofolate reductase inhibitor. Trimethoprim lactate is active against a wide range of Gram-positive and Gram-negative aerobic bacteria. Trimethoprim lactate has the potential for the research of urinary tract infections, Shigellosis and Pneumocystis pneumonia. Trimethoprim lactate can inhibit infection of Influenza A virus in chick embryo when combinated with zinc.

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

CAS No. : 23256-42-0

Size	Stock	Quantity
Solid + Solvent (Highly Recommended)
10 mM * 1 mL in DMSO ready for reconstitution	In-stock	Estimated Time of Arrival: December 31
Solution
10 mM * 1 mL in DMSO	In-stock	Estimated Time of Arrival: December 31
Solid
500 mg	In-stock	Estimated Time of Arrival: December 31
5 g	In-stock	Estimated Time of Arrival: December 31
10 g	Get quote
50 g	Get quote

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Customer Review

Based on 11 publication(s) in Google Scholar

Other Forms of Trimethoprim lactate:

Trimethoprim-d₃ In-stock
Trimethoprim-¹³C₃ In-stock
Trimethoprim In-stock
Trimethoprim hydrochloride In-stock
Trimethoprim lactate (Standard) In-stock
Trimethoprim sulfate Get quote

11 Publications Citing Use of MCE Trimethoprim lactate

Bio/Physico-chemical Assay

: Trimethoprim lactate purchased from MedChemExpress. Usage Cited in: bioRxiv. 2025 January 15.; Inhibitory effect of Trimethoprim on Babesia.

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Biological Activity
Purity & Documentation
References
Customer Review

Description

IC₅₀ & Target

Dihydrofolate reductase, Bacteria^[1]
Influenza A virus^[4]

In Vitro

Trimethoprim interrupts folate metabolism by inhibition of the activity of dihydrofolase reductase (DHFR), which reduces dihydrofolate to tetrahydrofolate (THF)^[1].
Trimethoprim (3 μg/mL; 1 h) induces protein aggregation and main heat shock proteins (Hsps) in E. coli cells, which indicates that Trimethoprim sulfate presence leads to protein misfolding^[1].
Trimethoprim (1.5-3 μg/mL; 1 h) causes induction of DnaK, DnaJ, GroEL, ClpB, and IbpA/B Hsps in E. coli cells exposed to folate and heat stress^[1].

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

In Vivo

Trimethoprim (10 mg/kg; i.v.; once every 12 h; 3 d) shows antibacterial activity against H. influenzae, S. pneumoniae, E. coli and N. meningitidis in infected mice^[2].
Trimethoprim can be connected with the thiomaltose (TM-TMP) and shows stability with a half-life of about 1 hour in complete serum, and has an MIC value around 1 μM against E. coli^[2].
Trimethoprim (10 mg/mL; 0.5 mL; inject with Trimethoprim-Zn combined suspension) decreases the virus titer and increases the survival rate of chicken embryo^[4].

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

Animal Model:	Female C3H/HeOuJ mice (transurethrally infected with a 50 μL suspension containing 1-2×10⁷ CFU of E. coli under 3% isoflurane)^[2]
Dosage:	10 mg/kg
Administration:	i.v.; once every 12 h; for 3 d
Result:	Showed antibacterial activity against H. influenzae, S. pneumoniae, E. coli and N. meningitidis with CD₅₀s of 150 mg/kg, 335 mg/kg, 27.5 mg/kg and 8.4 mg/kg, respectively in infected mice.

Animal Model:	Fertilized eggs (injected H3N2 virus into amniotic and allantoic space at day 8)^[4]
Dosage:	10 mg/mL; 0.5 mL
Administration:	The Trimethoprim-Zn combined suspension was injected into the air sac; single dosage
Result:	Decreased the virus titer and increased the survival rate of chicken embryo. The survival rate peaked at ratio about 0.18 (Zn/Trimethoprim).

Molecular Weight

380.40

Formula

C₁₇H₂₄N₄O₆

CAS No.

23256-42-0

Appearance

Solid

Color

White to off-white

SMILES

CC(O)C(O)=O.NC1=NC=C(CC2=CC(OC)=C(OC)C(OC)=C2)C(N)=N1

Shipping

Room temperature in continental US; may vary elsewhere.

Storage

4°C, sealed storage, away from moisture

*In solvent : -80°C, 6 months; -20°C, 1 month (sealed storage, away from moisture)

Solvent & Solubility

In Vitro:

DMSO : 250 mg/mL (657.20 mM; Need ultrasonic; Hygroscopic DMSO has a significant impact on the solubility of product, please use newly opened DMSO)

H₂O : 16.67 mg/mL (43.82 mM; Need ultrasonic)

Preparing
Stock Solutions

Concentration Solvent Mass	1 mg	5 mg	10 mg

1 mM	2.6288 mL	13.1441 mL	26.2881 mL
5 mM	0.5258 mL	2.6288 mL	5.2576 mL
10 mM	0.2629 mL	1.3144 mL	2.6288 mL

View the Complete Stock Solution Preparation Table

* 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 (sealed storage, away from moisture). When stored at -80°C, please use it within 6 months. When stored at -20°C, please use it within 1 month.

* Note: If you choose water as the stock solution, please dilute it to the working solution, then filter and sterilize it with a 0.22 μm filter before use.

Molarity Calculator
Dilution Calculator

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

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

This equation is commonly abbreviated as: C₁V₁ = C₂V₂

Concentration _(start)

Volume _(start)

Concentration _(final)

Volume _(final)

In Vivo:

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

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: ≥ 2.08 mg/mL (5.47 mM); Clear solution

This protocol yields a clear solution of ≥ 2.08 mg/mL (saturation unknown).
Taking 1 mL working solution as an example, add 100 μL DMSO stock solution (20.8 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.
Preparation of Saline: Dissolve 0.9 g sodium chloride in ddH₂O and dilute to 100 mL to obtain a clear Saline solution.
Protocol 2

Add each solvent one by one: 10% DMSO 90% (20% SBE-β-CD in Saline)
Solubility: ≥ 2.08 mg/mL (5.47 mM); Clear solution

This protocol yields a clear solution of ≥ 2.08 mg/mL (saturation unknown).
Taking 1 mL working solution as an example, add 100 μL DMSO stock solution (20.8 mg/mL) to 900 μL 20% SBE-β-CD in Saline, and mix evenly.
Preparation of 20% SBE-β-CD in Saline (4°C, storage for one week): 2 g SBE-β-CD powder is dissolved in 10 mL Saline, completely dissolve until clear.
Protocol 3

Add each solvent one by one: 10% DMSO 90% Corn Oil
Solubility: ≥ 2.08 mg/mL (5.47 mM); Clear solution

This protocol yields a clear solution of ≥ 2.08 mg/mL (saturation unknown). If the continuous dosing period exceeds half a month, please choose this protocol carefully.
Taking 1 mL working solution as an example, add 100 μL DMSO stock solution (20.8 mg/mL) to 900 μL Corn oil, and mix evenly.

For the following dissolution methods, please prepare the working solution directly. It is recommended to prepare fresh solutions and use them promptly within a short period of time.
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: PBS
Solubility: 2 mg/mL (5.26 mM); Clear solution; Need ultrasonic and warming and heat to 60°C

In Vivo Dissolution Calculator

Please enter the basic information of animal experiments:

Dosage

mg/kg

Animal weight
(per animal)

Dosing volume
(per animal)

μL

Number of animals

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

Calculation results:

Working solution concentration: mg/mL

This product has good water solubility, please refer to the measured solubility data in water/PBS/Saline for details.

The concentration of the stock solution you require exceeds the measured solubility. The following solution is for reference only.If necessary, please contact MedChemExpress (MCE).

Purity & Documentation

Purity: 99.90%

Select Batch:

Data Sheet (283 KB) SDS (393 KB)

COA (253 KB) HNMR (271 KB) LCMS (92 KB)

Handling Instructions (2659 KB)

References

[1]. Ewa Laskowska, et al. Trimethoprim Induces Heat Shock Proteins and Protein Aggregation in E. Coli Cells. Curr Microbiol. 2003 Oct;47(4):286-9. [Content Brief]

[2]. R N Brogden, et al. Trimethoprim: A Review of Its Antibacterial Activity, Pharmacokinetics and Therapeutic Use in Urinary Tract Infections. Drugs. 1982 Jun;23(6):405-30. [Content Brief]

[3]. Xiaojian Wang, et al. A Trimethoprim Conjugate of Thiomaltose Has Enhanced Antibacterial Efficacy In Vivo. Bioconjug Chem. 2018 May 16;29(5):1729-1735. [Content Brief]

[4]. El Habbal MH. Combination therapy of zinc and trimethoprim inhibits infection of influenza A virus in chick embryo. Virol J. 2021 Jun 3;18(1):113. [Content Brief]

Complete Stock Solution Preparation Table

Optional Solvent	Concentration Solvent Mass	1 mg	5 mg	10 mg	25 mg

H₂O / DMSO	1 mM	2.6288 mL	13.1441 mL	26.2881 mL	65.7203 mL
	5 mM	0.5258 mL	2.6288 mL	5.2576 mL	13.1441 mL
	10 mM	0.2629 mL	1.3144 mL	2.6288 mL	6.5720 mL
	15 mM	0.1753 mL	0.8763 mL	1.7525 mL	4.3814 mL
	20 mM	0.1314 mL	0.6572 mL	1.3144 mL	3.2860 mL
	25 mM	0.1052 mL	0.5258 mL	1.0515 mL	2.6288 mL
	30 mM	0.0876 mL	0.4381 mL	0.8763 mL	2.1907 mL
	40 mM	0.0657 mL	0.3286 mL	0.6572 mL	1.6430 mL
DMSO	50 mM	0.0526 mL	0.2629 mL	0.5258 mL	1.3144 mL
	60 mM	0.0438 mL	0.2191 mL	0.4381 mL	1.0953 mL
	80 mM	0.0329 mL	0.1643 mL	0.3286 mL	0.8215 mL
	100 mM	0.0263 mL	0.1314 mL	0.2629 mL	0.6572 mL

* Note: If you choose water as the stock solution, please dilute it to the working solution, then filter and sterilize it with a 0.22 μm filter before use.