α-D-Lactose monohydrate

Also known as: alpha-D-Lactose monohydrate, α-Lactose monohydrate, Lactose monohydrate, Milk sugar, 4-O-β-D-Galactopyranosyl-α-D-glucopyranose monohydrate, 4-O-beta-D-galactopyranosyl-alpha-D-glucopyranose monohydrate, α-D-Glucopyranose, 4-O-β-D-galactopyranosyl-, monohydrate

α-D-Lactose monohydrate (CAS 5989-81-1) is a compound in the Organic Compounds category listed in the Jingsj chemical database. It has the molecular formula C12H24O12 and a molecular weight of 360.31 g/mol. Key properties include a melting point of 219ºC, a boiling point of 667.9ºC at 760 mmHg, a density of 1.53 g/cm3 and a flash point of 357.8ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 5989-81-1
Jingsj CID: J-47033-7
Molecular Formula: C₁₂H₂₄O₁₂
Molecular Weight: 360.31 g/mol
Category: Organic Compounds
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	219ºC
Boiling Point	667.9ºC at 760 mmHg
Density	1.53 g/cm3
Flash Point	357.8ºC
Exact Mass	360.126770
PSA	198.76000
Refractive Index	1.652

Activity & Biological Data

Additional Information	[1]. Schuck, et al. Lactose crystallization: determination of α-lactose monohydrate in spray-dried dairy products. (2002). [2]. Johnson J M, et al. Lactose; Encyclopedia of Food Sciences and Nutrition[J]. 2003.

Frequently Asked Questions

What is the CAS number of α-D-Lactose monohydrate?

The CAS number of α-D-Lactose monohydrate is 5989-81-1.

What are the molecular formula and molecular weight of α-D-Lactose monohydrate?

α-D-Lactose monohydrate has molecular formula C12H24O12 and molecular weight 360.31 g/mol.

What are the upstream and downstream products of α-D-Lactose monohydrate?

For α-D-Lactose monohydrate, Downstream Products: D-Galactopyranose, D-(-)-Tagatose.

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. "α-D-Lactose monohydrate (CAS 5989-81-1)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-47033-7 (accessed 2026-11-06).

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