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.

L-Cystine ist eine chemische Verbindung, registriert unter der CAS-Nummer 30925-07-6. Summenformel: C6H14Cl2N2O4S2. Molmasse: 313.2 g/mol. IUPAC: (2R)-2-amino-3-[[(2R)-2-amino-2-carboxyethyl]disulfanyl]propanoic acid;dihydrochloride.

Wie lautet die CAS-Nummer von L-Cystine?

Die CAS-Nummer von L-Cystine ist 30925-07-6 — eine eindeutige Kennung des Chemical Abstracts Service (CAS).

Wie lautet die Summenformel von L-Cystine?

Summenformel: C6H14Cl2N2O4S2. Molmasse: 313.2 g/mol. PSA: 177 Å².

Welche GHS-Gefahren hat L-Cystine?

Gemäß der GHS-Klassifizierung muss L-Cystine mit den folgenden Gefahrenhinweisen gekennzeichnet werden: H314 (Verursacht schwere Verätzungen der Haut und schwere Augenschäden.), H318 (Verursacht schwere Augenschäden.).

Wo kann ich L-Cystine kaufen?

L-Cystine ist in unserem Shop erhältlich. Produkt ansehen: https://epchems.online/products/l-cystine/

Woher stammen die chemischen Daten für L-Cystine?

Die chemischen Daten für L-Cystine stammen aus zuverlässigen Quellen: PubChem (NIH). PubChem CID: 21121987. Konform mit der CLP-Verordnung (EG 1272/2008), verfügbar unter der Lizenz CC-BY 4.0.

L-Cystine

Cystine dihydrochloride

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

Über L-Cystine

L-Cystine ist eine chemische Verbindung, registriert unter der Nummer CAS 30925-07-6, mit der Summenformel C₆H₁₄Cl₂N₂O₄S₂, und einer Molmasse von 313.2 g/mol.

Das Molekül enthält 30 Atome, verbunden durch 27 chemische Bindungen. Der vollständige systematische IUPAC-Name dieser Verbindung lautet (2R)-2-amino-3-[[(2R)-2-amino-2-carboxyethyl]disulfanyl]propanoic acid;dihydrochloride. Das interaktive 3D-Modell oben zeigt die räumliche Anordnung der Atome — Sie können es mit der Maus drehen, mit dem Scrollrad zoomen und zwischen den Darstellungsmodi Skelett / Ball & Stick / Space Fill wechseln.

Hinsichtlich der physikalisch-chemischen Eigenschaften polare Oberfläche PSA = 177 Å², 6 Donatoren und 8 Wasserstoffbrücken-Akzeptoren. Diese Parameter sind entscheidend für die Beurteilung der Bioverfügbarkeit und der Wechselwirkung mit Biomolekülen.

Die chemischen Daten für diese Verbindung stammen aus PubChem (NIH NLM NCBI), einer der größten chemischen Datenbanken der Welt. Alle Informationen werden automatisch aktualisiert und um GHS-Gefahrenhinweise gemäß der CLP-Verordnung (EG 1272/2008) ergänzt. Das obige Widget darf für Bildungs-, Forschungs- und kommerzielle Zwecke verwendet werden.

Physikalisch-chemische Eigenschaften

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 ↗

GHS-Sicherheit

Sygnał: Niebezpieczeństwo

GHS05

H314 — Powoduje poważne oparzenia skóry oraz uszkodzenia oczu

H318 — Powoduje poważne uszkodzenie oczu

Wissenschaftliche Literatur

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.

Synonyme

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)

Datenquellen

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

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