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.

Qu'est-ce que L-Cystine ?

L-Cystine est un composé chimique enregistré sous le numéro CAS 30925-07-6. Formule brute: C6H14Cl2N2O4S2. Masse molaire: 313.2 g/mol. IUPAC: (2R)-2-amino-3-[[(2R)-2-amino-2-carboxyethyl]disulfanyl]propanoic acid;dihydrochloride.

Quel est le numéro CAS de L-Cystine ?

Le numéro CAS de L-Cystine est 30925-07-6 — un identifiant unique du Chemical Abstracts Service (CAS).

Quelle est la formule brute de L-Cystine ?

Formule brute: C6H14Cl2N2O4S2. Masse molaire: 313.2 g/mol. PSA: 177 Å².

Quels sont les dangers GHS de L-Cystine ?

Selon la classification GHS, L-Cystine doit porter les mentions de danger suivantes : H314 (Provoque des brûlures de la peau et des lésions oculaires graves.), H318 (Provoque des lésions oculaires graves.).

Où acheter L-Cystine ?

L-Cystine est disponible dans notre boutique. Voir le produit : https://epchems.online/products/l-cystine/

D'où proviennent les données chimiques de L-Cystine ?

Les données chimiques de L-Cystine proviennent de sources faisant autorité : PubChem (NIH). PubChem CID: 21121987. Conformes au règlement CLP (CE 1272/2008), disponibles sous licence CC-BY 4.0.

L-Cystine

Cystine dihydrochloride

CAS 30925-07-6 · C₆H₁₄Cl₂N₂O₄S₂ · MW 313.2 g/mol

À propos de L-Cystine

L-Cystine est un composé chimique enregistré sous le numéro CAS 30925-07-6, de formule brute C₆H₁₄Cl₂N₂O₄S₂, et de masse molaire 313.2 g/mol.

La molécule contient 30 atomes reliés par 27 liaisons chimiques. Le nom systématique IUPAC complet de ce composé est (2R)-2-amino-3-[[(2R)-2-amino-2-carboxyethyl]disulfanyl]propanoic acid;dihydrochloride. Le modèle 3D interactif ci-dessus permet de visualiser l'arrangement spatial des atomes — vous pouvez le faire pivoter à la souris, zoomer avec la molette et basculer entre les modes de visualisation squelette / Ball & Stick / Space Fill.

Du point de vue des propriétés physico-chimiques, surface polaire PSA = 177 Å², 6 donneurs et 8 accepteurs de liaisons hydrogène. Ces paramètres sont essentiels pour évaluer la biodisponibilité et l'interaction avec les biomolécules.

Les données chimiques de ce composé proviennent de PubChem (NIH NLM NCBI), l'une des plus grandes bases de données chimiques au monde. Toutes les informations sont mises à jour automatiquement et enrichies de traductions des mentions de danger GHS conformes au règlement CLP (CE 1272/2008). Le widget ci-dessus peut être utilisé à des fins éducatives, de recherche et commerciales.

Propriétés physico-chimiques

Wzór sumaryczny	C₆H₁₄Cl₂N₂O₄S₂
Masa molowa	313.2 g/mol
IUPAC	(2R)-2-amino-3-[[(2R)-2-amino-2-carboxyethyl]disulfanyl]propanoic acid;dihydrochloride
SMILES	`C([C@@H](C(=O)O)N)SSC[C@@H](C(=O)O)N.Cl.Cl`
InChIKey	`HHGZUQPEIHGQST-RGVONZFCSA-N`
logP (XLogP3)	—
PSA	177 Å²
HBD / HBA	6 / 8
PubChem CID	CID 21121987 ↗

Sécurité GHS

Sygnał: Niebezpieczeństwo

GHS05

H314 — Powoduje poważne oparzenia skóry oraz uszkodzenia oczu

H318 — Powoduje poważne uszkodzenie oczu

Littérature scientifique

Literatura naukowa

20 artykułów · 16 open access · Źródła: PubMed, OpenAlex, Semantic Scholar

📈 Timeline publikacji (20 artykułów)

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

A concise, asymmetric synthesis of (2R,3R)-3-hydroxyaspartic acid

J. K. Khalaf, A. Datta (2007) · Amino Acids

Cytowania: 9$ PaywallDOI ↗

Total synthesis of (5S,6R,7E,9E,11Z,14Z)-5-hydroxy-6-[(2R)-2-amino-2-(carboxyethyl)thio]-7,9,11,14-eicosatetraenoic acid, a potent SRS-A

Michael Rosenberger, Christian Neukom (1980) · Journal of the American Chemical Society

Cytowania: 41$ PaywallDOI ↗

The first asymmetric total syntheses of 3((1R,2R)- and 3((1S,2R)-2-(12-methyltridecyl)cyclopropyl)propanoic acid

Debendra K. Mohapatra, Nagesh Guguloth, J.S. Yadav (2012) · Tetrahedron Letters

Cytowania: 4$ PaywallDOI ↗

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Asymmetric Syntheses of (2R, 4S)-4-Amino-4-carboxy-2-methylpyrrolidine and (2R, 4S)-4-Amino-2-carboxy-2-ethylpyrrolidine as Novel 2-Alkyl-substituted (-)-Cucurbitine Analogues

Ken-ichi Tanaka, Hirokazu Suzuki, Hiroyuki Sawanishi (1996) · HETEROCYCLES

Cytowania: 9Open AccessDOI ↗PDF ↗

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Understanding surface potential dynamics of passivated perovskites via Kelvin Probe Force Microscopy

Rehmat Sood-Goodwin, Xue-Li Cao, Benjamin C. Kinvig et al. (2026) · arXiv (2607.07221v2)

Open AccessPDF ↗

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ProteinJEPA: Latent prediction complements protein language models

Dan Ofer, Dafna Shahaf, Michal Linial (2026) · arXiv (2605.07554v1)

Open AccessPDF ↗

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Towards an understanding of magnesium in a biological environment: A density functional theory study

Miranda Naurin, Sally Aldhaim, Moltas Elliver et al. (2026) · arXiv (2603.01648v1)

Open AccessDOI ↗PDF ↗

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Organic Acid Chemistry in ISM: Detection of Formic Acid and its Prebiotic Chemistry in Hot Core G358.93$-$0.03 MM1

Arijit Manna, Sabyasachi Pal, Sekhar Sinha et al. (2026) · arXiv (2602.09656v1)

Open AccessDOI ↗PDF ↗

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Tuning Terahertz Optomechanics of MoS2 Bilayers with Homogeneous In-plane Strain

S. Patel, Jose D. Mella, S. Puri et al. (2026) · arXiv (2602.03996v3)

Open AccessDOI ↗PDF ↗

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Surface Passivation for Halide Optoelectronics: Comparing Optimization and Reactivity of Amino-Silanes with Formamidinium

Zixu Huang, Farhad Akrami, Junxiang Zhang et al. (2025) · arXiv (2509.03713v1)

Open AccessPDF ↗

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First detection of ethylene oxide and acetaldehyde in hot core G358.93$-$0.03 MM1: Tracing prebiotic oxygen chemistry

Arijit Manna, Sabyasachi Pal (2025) · arXiv (2509.03382v1)

Open AccessDOI ↗PDF ↗

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Crystalline water intercalation into the Kitaev honeycomb cobaltate Na$_2$Co$_2$TeO$_6$

Masaaki Ito, Yuya Haraguchi, Teruki Motohashi et al. (2025) · arXiv (2508.08717v1)

Open AccessDOI ↗PDF ↗

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Unavailability of experimental 3D structural data on protein folding dynamics and necessity for a new generation of structure prediction methods in this context

Aydin Wells, Khalique Newaz, Jennifer Morones et al. (2025) · arXiv (2507.08188v2)

Open AccessDOI ↗PDF ↗

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Protein folding classes -- High-dimensional geometry of amino acid composition space revisited

Boryeu Mao (2025) · arXiv (2506.01857v5)

Open AccessPDF ↗

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The effect of stereochemical constraints on the structural properties of folded proteins

Jack A. Logan, Jacob Sumner, Alex T. Grigas et al. (2025) · arXiv (2501.02424v2)

Open AccessDOI ↗PDF ↗

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A Survey of Deep Learning Methods in Protein Bioinformatics and its Impact on Protein Design

Weihang Dai (2025) · arXiv (2501.01477v1)

Open AccessPDF ↗

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Sequence-Augmented SE(3)-Flow Matching For Conditional Protein Backbone Generation

Guillaume Huguet, James Vuckovic, Kilian Fatras et al. (2024) · arXiv (2405.20313v2)

Open AccessPDF ↗

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Detection and prebiotic chemistry of possible glycine precursor molecule methylenimine towards the hot molecular core G10.47+0.03

Arijit Manna, Sabyasachi Pal (2024) · arXiv (2404.12212v1)

Open AccessDOI ↗PDF ↗

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Bacterial cell death: Atomistic simulations reveal pore formation as a mode of action of structurally nano engineered star peptide polymers

Amal Jayawardena, Andrew Hung, Greg Qiao et al. (2024) · arXiv (2404.02501v3)

Open AccessPDF ↗

The question of the cyclization of 3-{(2-carboxyethyl)-3-[bis(2-carboxyethyl)amino]anilino}propanoic acid

V. Novikovaite, Z. I. Beresnevicius, G. Mikulskiene (2007) · Chemistry of Heterocyclic Compounds

Cytowania: 3$ PaywallDOI ↗

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

Synonymes

L-Cystine dihydrochloride · 30925-07-6 · L-Cystine, dihydrochloride · cystine dihydrochloride · L-Cystine HCl · WFN1A47EIG · EINECS 250-391-9 · L-CYSTINE, HYDROCHLORIDE (1:2) · RefChem:581401 · DTXCID401765572 · 250-391-9 · L-CYSTINE 2HCL · MFCD00070399 · L-Cystine (dihydrochloride) · L-Cystine (hydrochloride)

Sources des données

📊 PubChem CID 21121987 — NIH
🔬 NIST WebBook — spektroskopia
💊 ChEMBL — bioaktywność

Acheter en boutique

L-Cystine →

Molécules apparentées

Benzoic acid CAS 65-85-0 · C7H6O2 Diethyl phthalate (DEP) CAS 84-66-2 · C12H14O4 L-Phenylalanine CAS 63-91-2 · C9H11NO2 Phthalic anhydride (MA) CAS 85-44-9 · C8H4O3 L (+)-Tartaric acid CAS 87-69-4 · C4H6O6 Succinic Acid CAS 110-15-6 · C4H6O4