Overview
Alkaline phosphatase is a hydrolase enzyme that removes phosphate groups from molecules at alkaline pH levels. It is present in nearly all organisms and has multiple isoforms depending on its tissue source (e.g., intestinal, placental, or tissue-nonspecific). In humans, ALP levels are clinically significant for detecting liver and bone disorders. The enzyme is extensively used in biotechnology for DNA dephosphorylation, antibody conjugation, and as a reporter in diagnostic assays. Industrial-grade ALP finds applications in agriculture and environmental science for phosphate monitoring.
Physical and Chemical Properties
ALP is typically a dimeric metalloenzyme requiring magnesium or zinc ions for activity. Its optimal pH ranges from 8 to 10.5, with activity sharply declining outside this range. The enzyme is inactivated by chelating agents like EDTA and by heating above 65°C. Commercial preparations vary by source: Bacterial ALP (e.g., from E. coli) is more heat-resistant than mammalian versions, while calf intestinal ALP (CIAP) offers high specificity for molecular biology applications. Activity is measured in units (U), where 1 U hydrolyzes 1 μmol of p-nitrophenyl phosphate per minute at 37°C.
Main Applications
In diagnostics, ALP tests help identify biliary obstruction, bone diseases, and certain cancers. The enzyme is crucial in ELISA and Western blotting as a conjugated label for detection. Molecular biologists use it to prevent plasmid recircularization by removing 5' phosphates from DNA vectors. Industrial uses include phosphate removal in wastewater treatment and as a component in animal feed to enhance phosphorus absorption. Recent research explores ALP's role in gut microbiome modulation and anti-inflammatory therapies.
Safety and Storage
Lyophilized ALP is stable for years at -20°C but loses activity when reconstituted. Solutions should contain stabilizing agents like Tris or BSA and be aliquoted to avoid contamination. Avoid exposure to strong acids/bases and heavy metal ions. While generally safe, powder forms may cause respiratory irritation. Use nitrile gloves and masks during handling. Spills should be neutralized with mild detergent before disposal in accordance with local regulations for enzymatic waste.
B2B Procurement Guide
Specify required activity (e.g., ≥10,000 U/mg for research), source organism, and purity (electrophoresis-grade vs. industrial). For diagnostic use, ensure compliance with IVD regulations. Bulk orders (100+ grams) typically offer 15-30% cost savings. Reliable suppliers provide certificates of analysis (CoA) with detailed activity assays and endotoxin levels. Consider cold-chain logistics for temperature-sensitive shipments. Some manufacturers offer custom conjugations (e.g., FITC-labeled ALP) for assay development.
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