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-cisteina?

L-cisteina è un composto chimico registrato con il numero CAS 52-90-4. Formula bruta: C3H7NO2S. Massa molare: 121.16 g/mol. IUPAC: (2R)-2-amino-3-sulfanylpropanoic acid.

Qual è il numero CAS di L-cisteina?

Il numero CAS di L-cisteina è 52-90-4 — un identificativo univoco del Chemical Abstracts Service (CAS).

Qual è la formula bruta di L-cisteina?

Formula bruta: C3H7NO2S. Massa molare: 121.16 g/mol. logP (XLogP3): -2.5. PSA: 64.3 Å².

Quali sono i pericoli GHS di L-cisteina?

Secondo la classificazione GHS, L-cisteina deve riportare le seguenti indicazioni di pericolo: H302 (Nocivo se ingerito.).

Dove acquistare L-cisteina?

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

Da dove provengono i dati chimici di L-cisteina?

I dati chimici di L-cisteina provengono da fonti autorevoli: PubChem (NIH), ChEMBL (EBI). PubChem CID: 5862. Conformi al Regolamento CLP (CE 1272/2008), disponibili con licenza CC-BY 4.0.

L-cisteina

L-(+)-Cysteine

CAS 52-90-4 · C₃H₇NO₂S · MW 121.16 g/mol

Informazioni su L-cisteina

L-cisteina è un composto chimico registrato con il numero CAS 52-90-4, con formula bruta C₃H₇NO₂S, e massa molare di 121.16 g/mol.

La molecola contiene 14 atomi collegati da 13 legami chimici. Il nome sistematico IUPAC completo di questo composto è (2R)-2-amino-3-sulfanylpropanoic 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 = -2.5 (valore negativo, composto idrofilo), superficie polare PSA = 64.3 Å², 3 donatori e 4 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	C₃H₇NO₂S
Masa molowa	121.16 g/mol
IUPAC	(2R)-2-amino-3-sulfanylpropanoic acid
SMILES	`C([C@@H](C(=O)O)N)S`
InChIKey	`XUJNEKJLAYXESH-REOHCLBHSA-N`
logP (XLogP3)	-2.5
PSA	64.3 Å²
HBD / HBA	3 / 4
PubChem CID	CID 5862 ↗

Sicurezza GHS

Sygnał: Uwaga

GHS07

H302 — Działa szkodliwie po połknięciu

Letteratura scientifica

Literatura naukowa

7 artykułów · 6 open access · Źródła: PubMed, OpenAlex, Semantic Scholar

📈 Timeline publikacji (7 artykułów)

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

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Heat Capacities of L-Cysteine, L-Serine, L-Threonine, L-Lysine, and L-Methionine

Václav Pokorný, Vojtěch Štejfa, Jakub Havlín et al. (2023) · Molecules

Open AccessDOI ↗PDF ↗

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A fluorescent probe for concurrent detection of cysteine, homocysteine, and superoxide anion.

Li Y, Yu T, Wang Z et al. (2025) · Science advances

Open AccessDOI ↗PubMed ↗PDF ↗

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Lamin A/C-regulated cysteine catabolic flux modulates stem cell fate through epigenome reprogramming.

Wang Y, Shi H, Wittig J et al. (2026) · Nature metabolism

Open AccessDOI ↗PubMed ↗PDF ↗

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Cysteine-enabled cleavability to advance cross-linking mass spectrometry for global analysis of endogenous protein-protein interactions.

Jiao F, Braitbard M, Yu C et al. (2025) · Nature communications

Open AccessDOI ↗PubMed ↗PDF ↗

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EGFR inhibitor-resistant lung cancers exhibit collateral sensitivity to a covalent, cysteine-independent KEAP1 oligomerizing molecular bridge.

Bassil CF, Dillon K, Anderson GR et al. (2026) · Nature communications

Open AccessDOI ↗PubMed ↗PDF ↗

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Endothelial Drp1 integrates VEGF-induced redox signaling with glycolysis through cysteine oxidation to drive angiogenesis.

Nagarkoti S, Kim YM, Das A et al. (2026) · Nature communications

Open AccessDOI ↗PubMed ↗PDF ↗

Revitalizing p-GSK-3β via cysteine sulfenylation promotes hepatic insulin resistance by differentially regulating glycogenesis and gluconeogenesis.

Chen J, Liu Z, Gu J et al. (2026) · Nature metabolism

$ 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-cysteine · 52-90-4 · cysteine · Cystein · (R)-2-Amino-3-mercaptopropanoic acid · Thioserine · Half-cystine · L-(+)-Cysteine · beta-Mercaptoalanine · L-Cystein · (2R)-2-amino-3-sulfanylpropanoic acid · Cysteinum · L-Cys · cisteina · Half cystine

Fonti dei dati

📊 PubChem CID 5862 — NIH
🔬 NIST WebBook — spektroskopia
🌐 Wikidata
💊 ChEMBL — bioaktywność

Acquista nel negozio

L-Cysteine →

Molecole correlate

Ethylene Carbonate CAS 96-49-1 · C3H4O3 1-Hexanol CAS 111-27-3 · C6H14O L-Threonine CAS 72-19-5 · C4H9NO3 Ethanol CAS 100-42-5 · C8H8 Acetic anhydride CAS 108-24-7 · C4H6O3 Dipropylene glycol dimethyl ether CAS 111109-77-4 · C8H18O3