DL-Methionine

Also known as: DL-2-Amino-4-(methylthio)butanoic acid, (RS)-2-Amino-4-methylsulfanyl-butyric acid, DL-2-Amino-4-(methylthio)butyric acid, Metione, Cynaron, Pedameth, Petameth, Thiomedon, Urimeth, Neston, Amurex, Dyprin, Meonine, Metion, MET

DL-Methionine (CAS 59-51-8) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C5H11NO2S and a molecular weight of 149.211 g/mol. Key properties include a melting point of 270-273ºC, a boiling point of 306.9±37.0 °C at 760 mmHg, a density of 1.2±0.1 g/cm3 and a flash point of 139.4±26.5 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 59-51-8
Jingsj CID: J-1091596-5
Molecular Formula: C₅H₁₁NO₂S
Molecular Weight: 149.211 g/mol
Category: Organic Acids
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	270-273ºC
Boiling Point	306.9±37.0 °C at 760 mmHg
Density	1.2±0.1 g/cm3
Flash Point	139.4±26.5 °C
Exact Mass	149.051056
PSA	88.62000
LogP	0.37
Vapor Pressure	0.0±1.4 mmHg at 25°C
Refractive Index	1.531
Additional Property	1 M HCl: 0.5 M at 20 °C, clear, colorless \| 2.9 g/100 mL (20 ºC)

Activity & Biological Data

Target	H. rostochiensis[1]
Additional Information	[1]. K. evans, et al. Effects of amino acids on the reproduction of Heterodera rostochiensis. Nematologica, 1971, 17(4), 495-500. [2]. Swennen Q, et al. Effects of dietary protein content and 2-hydroxy-4-methylthiobutanoic acid or DL-methionine supplementation on performance and oxidative status of broiler chickens. Br J Nutr. 2011 Dec;106(12):1845-54. [3]. Garlich JD. Response of broilers to DL-methionine hydroxy analog free acid, DL-methionine, and L-methionine. Poult Sci. 1985 Aug;64(8):1541-8.

Target

H. rostochiensis[1]

Additional Information

[1]. K. evans, et al. Effects of amino acids on the reproduction of Heterodera rostochiensis. Nematologica, 1971, 17(4), 495-500. [2]. Swennen Q, et al. Effects of dietary protein content and 2-hydroxy-4-methylthiobutanoic acid or DL-methionine supplementation on performance and oxidative status of broiler chickens. Br J Nutr. 2011 Dec;106(12):1845-54. [3]. Garlich JD. Response of broilers to DL-methionine hydroxy analog free acid, DL-methionine, and L-methionine. Poult Sci. 1985 Aug;64(8):1541-8.

Customs & Trade Information

HS Code	2930400000

Frequently Asked Questions

What is the CAS number of DL-Methionine?

The CAS number of DL-Methionine is 59-51-8.

What are the molecular formula and molecular weight of DL-Methionine?

DL-Methionine has molecular formula C5H11NO2S and molecular weight 149.211 g/mol.

What are the upstream and downstream products of DL-Methionine?

For DL-Methionine, Upstream Products: N-Acetyl-DL-methionine, DL-Methioninol, 5-[2-(Methylthio)ethyl]hydantoin; Downstream Products: N-Acetyl-DL-methionine ethyl ester, L-Cystathionine, D-Methionine.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated: 8/21/2026

How to cite: Jingsj. "DL-Methionine (CAS 59-51-8)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1091596-5 (accessed 2026-11-09).

Data for reference only; verify product details with suppliers before purchase.