Chemical Identity and Structure

3-Methacrylamidophenylboronic Acid (contains varying amounts of Anhydride), catalogued under Aladdin SKU M335158, is an arylboronic acid monomer in which a methacrylamide vinyl group is installed at the meta position of a phenylboronic acid scaffold. The molecule therefore presents two chemically distinct and independently useful functionalities: (1) a boronic acid head group capable of reversible covalent esterification with 1,2- and 1,3-cis-diol motifs, and (2) a methacrylamide tail that undergoes efficient radical polymerization under standard conditions.

The notation contains varying amounts of Anhydride refers to the tendency of arylboronic acids to partially self-condense into cyclic boroxine (boronic anhydride) trimers upon concentration or drying. This equilibrium is fully reversible upon dissolution in protic solvents or aqueous buffers, and the anhydride fraction does not compromise the compound's performance as a polymerizable monomer or as a diol-binding ligand.

The meta substitution pattern is significant: it positions the boronic acid group at a geometry that can adopt the tetrahedral, anionic boronate form at near-physiological pH (pKa typically reported in the range of 8–9 for meta-substituted phenylboronic acid monomers), making it more useful at lower pH values compared to unsubstituted phenylboronic acid.

Synthesis and Polymerization Behavior

The methacrylamide double bond of 3-Methacrylamidophenylboronic Acid participates readily in radical chain-growth polymerization. It can be homopolymerized or copolymerized with a broad range of vinyl comonomers — including acrylamide, N-isopropylacrylamide (NIPAAm), hydroxyethyl methacrylate (HEMA), and charged monomers — to produce materials with tailored hydrophilicity, charge, and mechanical properties.

Controlled radical polymerization techniques, such as Reversible Addition–Fragmentation chain Transfer (RAFT) polymerization and Atom Transfer Radical Polymerization (ATRP), are compatible with this monomer, enabling the synthesis of well-defined block copolymers and narrow-dispersity homopolymers. When using RAFT, selection of a chain transfer agent (CTA) with appropriate reactivity toward methacrylamide-type monomers (e.g., trithiocarbonate-based CTAs) is recommended.

Key practical notes for polymerization: the boronic acid group is tolerant of standard aqueous and organic polymerization media; however, strongly basic conditions should be avoided during synthesis to prevent premature boronate ester hydrolysis or undesired side reactions. Deoxygenation of monomer solutions prior to free-radical initiation is standard practice. Stock solutions are best prepared in dimethyl sulfoxide (DMSO) or dilute aqueous base.

Research Applications

Glucose and saccharide sensing: The reversible covalent interaction between the boronic acid group and the cis-diol moieties of saccharides (glucose, fructose, galactose) is the basis of a large body of sensor and diagnostic research. Polymers incorporating this monomer can be formulated as optical sensors, electrochemical biosensors, or hydrogel actuators that change volume, fluorescence, or electrical properties in proportion to analyte concentration.

Stimuli-responsive hydrogels: Copolymerization of 3-Methacrylamidophenylboronic Acid with NIPAAm or other thermo-responsive monomers yields dual-responsive gels that swell or shrink in response to both temperature and saccharide concentration. Such materials are under active investigation for controlled drug-release applications, particularly for insulin delivery systems triggered by hyperglycaemia.

Affinity separation and chromatography: Immobilization of boronic acid ligands onto chromatographic supports via radical co-polymerization provides reusable affinity resins for the selective capture of glycoproteins, RNA, catecholamines, and ribonucleosides. The methacrylamide monomer serves as a convenient handle for anchoring the boronic acid to polyacrylamide beads, monolithic columns, or membrane substrates.

Molecularly imprinted polymers (MIPs): This monomer is frequently used as a functional monomer in MIP protocols targeting saccharide-containing templates, exploiting its reversible diol-binding chemistry for template pre-organization and selective rebinding.

Handling, Storage, and Safety Considerations

Storage: Store the compound in a cool, dry environment away from light and moisture. Boronic acids can absorb atmospheric moisture, accelerating anhydride formation; therefore, it is recommended to keep the container tightly sealed under an inert atmosphere (argon or nitrogen) and to use desiccants where appropriate. Refer to the product-specific Safety Data Sheet (SDS) for official storage temperature recommendations.

Handling: Use standard laboratory personal protective equipment (PPE): nitrile gloves, safety glasses, and a laboratory coat. Operations generating dust or aerosols should be performed in a fume hood. As with many fine-chemical reagents, avoid ingestion, inhalation, and contact with skin or eyes.

Dissolution tips: The compound is soluble in polar aprotic solvents such as DMSO and DMF, as well as in dilute aqueous base (pH 8–10). Aqueous solubility at neutral pH may be limited; sonication or gentle warming can assist dissolution. Pre-dissolution in a small volume of DMSO followed by dilution into aqueous buffer is a practical approach for biological assay preparations.

Stability: The methacrylamide double bond is susceptible to adventitious radical polymerization; the compound may be supplied with a radical inhibitor. Verify inhibitor content with Aladdin Scientific technical support if inhibitor removal is required prior to polymerization.

Ordering Information and Specifications

3-Methacrylamidophenylboronic Acid (contains varying amounts of Anhydride) is available from Aladdin Scientific under SKU M335158. This product is cross-referenced with Santa Cruz Biotechnology number sc-289181, facilitating direct substitution for researchers already familiar with that catalog source.

For purity specifications, available pack sizes, current pricing, and certificate of analysis (CoA) documentation, please visit the Aladdin Scientific product page for M335158 or contact our technical sales team. Bulk quantities and custom packaging may be available upon request.

Researchers requiring a certificate of analysis, SDS, or NMR/HPLC characterization data should submit a request through the Aladdin Scientific customer service portal. Lot-specific documentation helps ensure reproducibility across experiments and supports regulatory submissions where applicable.