α-Lactose monohydrate
α-Lactose monohydrate (CAS 5989-81-1, C12H22O11 · H2O) is a high-purity disaccharide derivative of lactose, with a molecular weight of 360.31 g/mol. Supplied as a BioXtra grade, it is soluble in water and primarily used in biochemical research, cell biology studies, and as a component in metabolic libraries. Its precise composition and high assay make it suitable for demanding laboratory applications.
- IUPAC
- β-D-Gal-(1→4)-α-D-Glc,4-O-β-D-Galactopyranosyl-α-D-glucose,Milk sugar
- Synonyms
- 4-O-β-D-Galactopyranosyl-α-D-glucoseMilk sugar

Biochemical Research
Utilised as a substrate or standard in various biochemical assays and studies. Its defined purity ensures reliable experimental outcomes.
Cell Biology Studies
Serves as a key component in cell culture media or for investigating cellular metabolic pathways. Ideal for research into carbohydrate metabolism.
Metabolic Libraries
Included in metabolic libraries for high-throughput screening and drug discovery processes. Facilitates the study of enzymatic reactions involving lactose.
Carbohydrate Chemistry
Used as a starting material or reference compound in the synthesis and analysis of complex carbohydrates. Supports advanced research in glycochemistry.
| Molecular weight | 360.31 |
|---|---|
| Empirical formula | C12H22O11 · H2O |
| Assay | ≥99% total lactose basis (GC) |
| Solubility | H2O: soluble1 M, clear, colorless |
| Impurities tested | ≤0.05% Glucose≤4% β-lactose |
| Protective equipment | Eyeshields, Gloves, type N95 (US), type P1 (EN143) respirator filter |
|---|---|
| Water hazard class (WGK, DE) | 3 |
| Cation traces | Al: ≤0.0005%Ca: ≤0.005%Cu: ≤0.0005%Fe: ≤0.0005%K: ≤0.02%Mg: ≤0.0005%NH4+: ≤0.05%Na: ≤0.005%Pb: ≤0.001%Zn: ≤0.0005% |
| Anion traces | chloride (Cl-): ≤0.05%sulfate (SO42-): ≤0.05% |
| Ignition residue | ≤0.1% |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
| Product Line | BioXtra |
|---|
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is α-Lactose monohydrate used for?
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α-Lactose monohydrate is used in biochemical research, cell biology studies, metabolic libraries, and carbohydrate chemistry.
What is the CAS number and formula for α-Lactose monohydrate?
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The CAS number is 5989-81-1, and the empirical formula is C12H22O11 · H2O.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies α-Lactose monohydrate as a BioXtra grade with an assay of ≥99% on a total lactose basis (GC). Impurities include ≤0.05% Glucose and ≤4% β-lactose. This product is not represented as USP, BP, or EP grade.
What are the safety and handling recommendations for α-Lactose monohydrate?
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When handling α-Lactose monohydrate, it is essential to use appropriate personal protective equipment, including eyeshields and gloves. A type N95 (US) or type P1 (EN143) respirator filter is recommended. Observe standard laboratory safety protocols for handling fine chemicals.
Is α-Lactose monohydrate a controlled substance?
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Based on the provided data, α-Lactose monohydrate is not listed as a controlled substance. However, users should always verify local regulations.
How is α-Lactose monohydrate packed, shipped, and exported?
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α-Lactose monohydrate is carefully packed to maintain its integrity during transit. Tech Serve Solutions offers global export services for this chemical, adhering to international shipping standards.
How can I request a sample or a quote for α-Lactose monohydrate?
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To request a sample or a quote for α-Lactose monohydrate, please contact our sales team through the TSS website or by calling our dedicated customer service line.
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