L-Histidine

Also known as: His, H-His-OH, L-His, Histidine, L-Histidine base, (S)-1H-Imidazole-4-alanine, (S)-α-Amino-1H-imidazole-4-propanoic acid, 3-(1H-imidazol-4-yl)-L-Alanine, 4-(2-Amino-2-carboxyethyl)imidazole, MFCD00064315, EINECS 200-745-3, FEMA 3694, (S)-4-(2-amino-2-carboxyethyl)imidazole

L-Histidine (CAS 71-00-1) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C6H9N3O2 and a molecular weight of 155.155 g/mol. Key properties include a melting point of 282 °C (dec.)(lit.), a boiling point of 458.9±35.0 °C at 760 mmHg, a density of 1.4±0.1 g/cm3 and a flash point of 231.3±25.9 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 71-00-1
Jingsj CID: J-920724-3
Molecular Formula: C₆H₉N₃O₂
Molecular Weight: 155.155 g/mol
Category: Organic Acids
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	282 °C (dec.)(lit.)
Boiling Point	458.9±35.0 °C at 760 mmHg
Density	1.4±0.1 g/cm3
Flash Point	231.3±25.9 °C
Exact Mass	155.069473
PSA	92.00000
LogP	-1.26
Vapor Pressure	0.0±1.2 mmHg at 25°C
Refractive Index	1.615
Additional Property	41.6 g/L (25 ºC)

Activity & Biological Data

Additional Information	[1]. Bou Zeidan M, et al. L-histidine inhibits biofilm formation and FLO11-associated phenotypes in Saccharomyces cerevisiae flor yeasts. PLoS One. 2014 Nov 4;9(11):e112141. [2]. Rama Rao KV, et al. Brain edema in acute liver failure: inhibition by L-histidine. Am J Pathol. 2010 Mar;176(3):1400-8. [3]. Yoshikawa T, et al. Insufficient intake of L-histidine reduces brain histamine and causes anxiety-like behaviors in male mice. J Nutr. 2014 Oct;144(10):1637-41.

Additional Information

[1]. Bou Zeidan M, et al. L-histidine inhibits biofilm formation and FLO11-associated phenotypes in Saccharomyces cerevisiae flor yeasts. PLoS One. 2014 Nov 4;9(11):e112141. [2]. Rama Rao KV, et al. Brain edema in acute liver failure: inhibition by L-histidine. Am J Pathol. 2010 Mar;176(3):1400-8. [3]. Yoshikawa T, et al. Insufficient intake of L-histidine reduces brain histamine and causes anxiety-like behaviors in male mice. J Nutr. 2014 Oct;144(10):1637-41.

Customs & Trade Information

HS Code	2933290090
Summary	2933290090. other compounds containing an unfused imidazole ring (whether or not hydrogenated) in the structure. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0%

Frequently Asked Questions

What is the CAS number of L-Histidine?

The CAS number of L-Histidine is 71-00-1.

What are the molecular formula and molecular weight of L-Histidine?

L-Histidine has molecular formula C6H9N3O2 and molecular weight 155.155 g/mol.

What are the upstream and downstream products of L-Histidine?

For L-Histidine, Upstream Products: L-Carnosine, 2-Mercapto-L-histidine, L-Histidine; Downstream Products: Boc-His(Trt)-OH, 3-Methyl-L-histidine, 1-Methyl-L-histidine.

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. "L-Histidine (CAS 71-00-1)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-920724-3 (accessed 2026-11-09).

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