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-tryptophane ?

L-tryptophane est un composé chimique enregistré sous le numéro CAS 73-22-3. Formule brute: C11H12N2O2. Masse molaire: 204.22 g/mol. IUPAC: (2S)-2-amino-3-(1H-indol-3-yl)propanoic acid.

Quel est le numéro CAS de L-tryptophane ?

Le numéro CAS de L-tryptophane est 73-22-3 — un identifiant unique du Chemical Abstracts Service (CAS).

Quelle est la formule brute de L-tryptophane ?

Formule brute: C11H12N2O2. Masse molaire: 204.22 g/mol. logP (XLogP3): -1.1. PSA: 79.1 Å².

Où acheter L-tryptophane ?

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

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

Les données chimiques de L-tryptophane proviennent de sources faisant autorité : PubChem (NIH), ChEMBL (EBI). PubChem CID: 6305. Conformes au règlement CLP (CE 1272/2008), disponibles sous licence CC-BY 4.0.

L-tryptophane

CAS 73-22-3 · C₁₁H₁₂N₂O₂ · MW 204.22 g/mol

À propos de L-tryptophane

L-tryptophane est un composé chimique enregistré sous le numéro CAS 73-22-3, de formule brute C₁₁H₁₂N₂O₂, et de masse molaire 204.22 g/mol.

La molécule contient 27 atomes reliés par 28 liaisons chimiques. Le nom systématique IUPAC complet de ce composé est (2S)-2-amino-3-(1H-indol-3-yl)propanoic acid. 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, le coefficient de partage logP = -1.1 (valeur négative, composé hydrophile), surface polaire PSA = 79.1 Å², 3 donneurs et 3 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	C₁₁H₁₂N₂O₂
Masa molowa	204.22 g/mol
IUPAC	(2S)-2-amino-3-(1H-indol-3-yl)propanoic acid
SMILES	`C1=CC=C2C(=C1)C(=CN2)C[C@@H](C(=O)O)N`
InChIKey	`QIVBCDIJIAJPQS-VIFPVBQESA-N`
logP (XLogP3)	-1.1
PSA	79.1 Å²
HBD / HBA	3 / 3
PubChem CID	CID 6305 ↗

Littérature scientifique

Literatura naukowa

13 artykułów · 11 open access · Źródła: PubMed, OpenAlex, Semantic Scholar

📈 Timeline publikacji (13 artykułów)

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

🔓

Heat Capacities of l-Histidine, l-Phenylalanine, l-Proline, l-Tryptophan and l-Tyrosine

Václav Pokorný, Vojtěch Štejfa, Jakub Havlín et al. (2021) · Molecules

Cytowania: 23Open AccessDOI ↗PDF ↗

🔓

Crystal structure of (S)-2-amino-3-(1H-indol-3-yl)propanoic addate – acetic acid – water (1:1:1), C11H12N2O2 · CH3COOH · H2O

Jian Li, Zu-pei Liang, Xishi Tai (2009)

Cytowania: 1Open AccessDOI ↗PDF ↗

🔓

Crystal structure of (S)-2-amino-3-(1H-indol-3-yl)propanoic acidate — acetic acid—water (1:1:1), C11H12N2O2·CH3COOH·H2O

J. Li, Zu-pei Liang, Xishi Tai (2009)

Cytowania: 1Open AccessDOI ↗PDF ↗

🔓

pH regulates gut bacterial tryptophan metabolism.

Brinck JE, Laursen MF, Pedersen M et al. (2026) · NPJ biofilms and microbiomes

Open AccessDOI ↗PubMed ↗PDF ↗

🔓

AARS1 promotes tumor progression and immune evasion via ATF6 lactylation-mediated tryptophan metabolism in hepatocellular carcinoma.

Wang Y, Li F, Li J et al. (2026) · Cell metabolism

Open AccessDOI ↗PubMed ↗PDF ↗

🔓

Increasing plant protein sources in the diet modulates gut microbiota and tryptophan metabolism in men at cardiometabolic risk.

Lépine G, Davila AM, Cueff G et al. (2026) · Gut microbes

Open AccessDOI ↗PubMed ↗PDF ↗

🔓

Tryptophan degradation by intestinal Bacteroides induces anti-tumor immunity and limits melanoma growth.

Olea XD, Beede K, Pereira G et al. (2026) · Cell reports. Medicine

Open AccessDOI ↗PubMed ↗PDF ↗

🔓

Tryptophan metabolic gatekeeping in epithelial repair: GPR35-KLF5 circuitry decodes mucosal damage signals for repair programming.

Xie B, Wang M, Xiao Y et al. (2026) · Cell death & disease

Open AccessDOI ↗PubMed ↗PDF ↗

🔓

Tryptophan-Restricted Intermittent Diet Alleviates Estrogen Deficiency-Induced Osteoporosis via Regulating Coupling Effects of "Gut-Bone" Axis.

Xiang T, Xiao S, Yang C et al. (2026) · International journal of biological sciences

Open AccessDOI ↗PubMed ↗PDF ↗

🔓

Dietary Tryptophan Enhances Aryl Hydrocarbon Receptor Activation and Reduces Colitis Through Microbial Metabolism.

Rondeau LE, Da Luz BB, Haas D et al. (2026) · Cellular and molecular gastroenterology and hepatology

Open AccessDOI ↗PubMed ↗PDF ↗

Ma-Xing-Shi-Gan decoction alleviates allergic asthma by modulating the gut microbiota-tryptophan metabolism-ILC2 axis.

Lv M, Wang C, Hong Y et al. (2026) · Phytomedicine : international journal of phytotherapy and phytopharmacology

$ PaywallDOI ↗PubMed ↗

Gut-Derived Lactobacillus rhamnosus GG Alleviates Intestinal Inflammation in Laying Hens via Microbiota Remodeling and Tryptophan Metabolic Reprogramming.

Zhao M, Amevor FK, Liu L et al. (2026) · Journal of agricultural and food chemistry

$ PaywallDOI ↗PubMed ↗

🔓

(3-(1H-Indol-3-yl)-2-(7,8,12,13-tetraoxa-10-azaspiro[5.7]tridecan-10-yl)propanoic acid) with Cytotoxic Activity

Nataliya N. Makhmudiyarova, Irina R. Ishmukhametova, Lilya U. Dzhemileva et al. (2023) · Molbank

Open AccessDOI ↗PDF ↗

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-tryptophan · tryptophan · 73-22-3 · L-Tryptophane · Tryptophane · (S)-Tryptophan · trofan · tryptacin · (2S)-2-amino-3-(1H-indol-3-yl)propanoic acid · Ardeytropin · Pacitron · Indole-3-alanine · L-Tryptofan · L-Trp · L-(-)-Tryptophan

Sources des données

📊 PubChem CID 6305 — NIH
🔬 NIST WebBook — spektroskopia
🌐 Wikidata
💊 ChEMBL — bioaktywność

Acheter en boutique

L-Tryptophan →

Molécules apparentées

Polyethylene glycol CAS 25322-68-3 Triethylene glycol monobutyl ether CAS 143-22-6 · C10H22O4 Dimethylformamide CAS 68-12-2 · C3H7NO Titanium Dioxide CAS 13463-67-7 · TiO₂ Isopropyl acetate CAS 108-21-4 · C5H10O2 Butyl glycol CAS 111-76-2 · C6H14O2