Does BMA mean n-butyl methacrylate or isobutyl methacrylate?

In most commercial usage the bare abbreviation means the normal isomer, n-butyl methacrylate, CAS 97-88-1. The branched isomer, isobutyl methacrylate, is a different substance with its own identifiers and a different contribution to copolymer hardness, and the tertiary isomer is different again. Because all three are abbreviated loosely in day-to-day correspondence, an order written as BMA alone is ambiguous. Write the full chemical name and the CAS number on every enquiry, purchase order and goods-inwards record.

Why must the monomer not be blanketed with pure nitrogen?

Because the stabiliser used in commercial methacrylate monomers requires dissolved oxygen to function. It intercepts radicals by a mechanism that consumes oxygen, so a drum stripped of oxygen contains an inhibitor that is chemically present and functionally absent. The correct headspace is air, or air diluted with nitrogen to a specified oxygen content, never an inert blanket. This is one of the very few cases in a chemical store where displacing oxygen makes a material more dangerous rather than less, and it catches people whose instinct is trained on flammable solvents.

How should inhibitor content be read on a certificate?

As a starting condition rather than a permanent property. The certificate reports the inhibitor level at release; that level falls in storage as the stabiliser does its job, and it falls faster in warm conditions, in light and in the presence of contamination. A long-stored drum can meet its original certificate on every other line while having very little inhibitor left. Where storage has been long or uncertain, retest the inhibitor level before charging a reactor rather than relying on the release figure.

What is popcorn polymerisation and why does it matter here?

It is a self-propagating, expanding polymer growth that forms in dead legs, vapour spaces, valve bonnets and residues where inhibitor cannot reach. Once seeded it continues under conditions that would not start a normal polymerisation, and it grows mechanically enough to jam valves and distort equipment. The controls are housekeeping controls: no unswept dead legs, no long-standing residues, no lines left full between campaigns, and clean vessels before refilling. It is not a reason to avoid methacrylate monomers, but it is a reason to design the pipework as if the monomer were reactive, because it is.

How does the butyl ester change a copolymer compared with the methyl one?

The four-carbon ester side chain is flexible and bulky, so it loosens chain packing and lowers the temperature at which the polymer softens. Against the methyl ester it gives a softer, more flexible and more extensible polymer, better adhesion and easier film formation, at the cost of hardness and block resistance. Against the corresponding acrylate it gives a harder polymer with the weathering advantage of the methacrylate backbone. Formulators use it as the soft component of an all-methacrylate system, which keeps the durability while tuning flexibility.

Che cos'è L-Leucine?

L-Leucine è un composto chimico registrato con il numero CAS 61-90-5. Formula bruta: C6H13NO2. Massa molare: 131.17 g/mol. IUPAC: (2S)-2-amino-4-methylpentanoic acid.

Qual è il numero CAS di L-Leucine?

Il numero CAS di L-Leucine è 61-90-5 — un identificativo univoco del Chemical Abstracts Service (CAS).

Qual è la formula bruta di L-Leucine?

Formula bruta: C6H13NO2. Massa molare: 131.17 g/mol. logP (XLogP3): -1.5. PSA: 63.3 Å².

Dove acquistare L-Leucine?

L-Leucine è disponibile nel nostro negozio. Vedi il prodotto: https://epchems.online/products/l-leucine/

Da dove provengono i dati chimici di L-Leucine?

I dati chimici di L-Leucine provengono da fonti autorevoli: PubChem (NIH), ChEMBL (EBI). PubChem CID: 6106. Conformi al Regolamento CLP (CE 1272/2008), disponibili con licenza CC-BY 4.0.

L-Leucine

CAS 61-90-5 · C₆H₁₃NO₂ · MW 131.17 g/mol

Informazioni su L-Leucine

L-Leucine è un composto chimico registrato con il numero CAS 61-90-5, con formula bruta C₆H₁₃NO₂, e massa molare di 131.17 g/mol.

La molecola contiene 22 atomi collegati da 21 legami chimici. Il nome sistematico IUPAC completo di questo composto è (2S)-2-amino-4-methylpentanoic acid. Il modello 3D interattivo qui sopra permette di visualizzare la disposizione spaziale degli atomi — puoi ruotarlo con il mouse, zoomare con la rotellina e passare tra le modalità di visualizzazione scheletro / Ball & Stick / Space Fill.

Dal punto di vista delle proprietà chimico-fisiche, il coefficiente di ripartizione logP = -1.5 (valore negativo, composto idrofilo), superficie polare PSA = 63.3 Å², 2 donatori e 3 accettori di legami a idrogeno. Questi parametri sono fondamentali per valutare la biodisponibilità e l'interazione con le biomolecole.

I dati chimici di questo composto provengono da PubChem (NIH NLM NCBI), uno dei più grandi database chimici al mondo. Tutte le informazioni sono aggiornate automaticamente e arricchite con le traduzioni delle indicazioni di pericolo GHS conformi al Regolamento CLP (CE 1272/2008). Il widget qui sopra può essere utilizzato per scopi educativi, di ricerca e commerciali.

Proprietà chimico-fisiche

Wzór sumaryczny	C₆H₁₃NO₂
Masa molowa	131.17 g/mol
IUPAC	(2S)-2-amino-4-methylpentanoic acid
SMILES	`CC(C)C[C@@H](C(=O)O)N`
InChIKey	`ROHFNLRQFUQHCH-YFKPBYRVSA-N`
logP (XLogP3)	-1.5
PSA	63.3 Å²
HBD / HBA	2 / 3
PubChem CID	CID 6106 ↗

Letteratura scientifica

Literatura naukowa

7 artykułów · 4 open access · Źródła: PubMed, OpenAlex, Semantic Scholar

📈 Timeline publikacji (7 artykułów)

Wysokość słupka = liczba artykułów w roku. Hover dla szczegółów.

Conformation of Peptides Containing a Chiral -Ethylated ,-Disubstituted -Amino Acid: (S)--Ethylleucine (=(2S)-2-Amino-2-ethyl-4-methylpentanoic Acid) within Sequences of Dimethylglycine and Diethylglycine Residues

Makoto Oba, Masakazu Tanaka, Masaaki Kurihara et al. (2002) · Helvetica Chimica Acta

Cytowania: 38$ PaywallDOI ↗

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Acetyl-DL-leucine in two individuals with REM sleep behavior disorder improves symptoms, reverses loss of striatal dopamine-transporter binding and stabilizes pathological metabolic brain pattern-case reports.

Oertel WH, Janzen A, Henrich MT et al. (2024) · Nature communications

Open AccessDOI ↗PubMed ↗PDF ↗

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Pyruvate metabolism enzyme DLAT promotes tumorigenesis by suppressing leucine catabolism.

Wang N, Lu S, Cao Z et al. (2025) · Cell metabolism

Open AccessDOI ↗PubMed ↗PDF ↗

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HMGA2 and protein leucine methylation drive pancreatic cancer lineage plasticity.

Dobersch S, Yamamoto N, Schutter A et al. (2025) · Nature communications

Open AccessDOI ↗PubMed ↗PDF ↗

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Chemotherapeutic agents and leucine deprivation induce codon-biased aberrant protein production in cancer.

Kochavi A, Nagel R, Körner PR et al. (2024) · Nucleic acids research

Open AccessDOI ↗PubMed ↗PDF ↗

Modified Xiaoyaosan rescues depression-like behavior via remodeling gut microbiota and leucine metabolism.

Zhao Y, Wang Q, Wu Z et al. (2025) · Phytomedicine : international journal of phytotherapy and phytopharmacology

$ PaywallDOI ↗PubMed ↗

BCKDK accelerates the progression of diabetic kidney disease by regulating leucine-mediated metabolic remodelling in renal tubular cells.

Shi C, Wang X, Qin S et al. (2025) · Diabetologia

$ PaywallDOI ↗PubMed ↗

Dane z PubMed (NIH NLM), OpenAlex (CC0), Semantic Scholar (AI2). AI Summary wygenerowane przez Semantic Scholar TLDR. Artykuły z ikoną wymagają płatnego dostępu.

Sinonimi

L-leucine · leucine · 61-90-5 · (S)-2-Amino-4-methylpentanoic acid · (S)-Leucine · (2S)-2-amino-4-methylpentanoic acid · (S)-(+)-Leucine · Leucin · (S)-2-Amino-4-methylvaleric acid · L-alpha-Aminoisocaproic acid · LEUCINE, L- · Leucinum · Leucina · FEMA No. 3297 · (2S)-alpha-leucine

Fonti dei dati

📊 PubChem CID 6106 — NIH
🔬 NIST WebBook — spektroskopia
🌐 Wikidata
💊 ChEMBL — bioaktywność

Acquista nel negozio

L-Leucine →

Molecole correlate

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