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.

什么是L-色氨酸？

L-色氨酸是一种化学品，CAS 登记号为 73-22-3。分子式: C11H12N2O2. 摩尔质量: 204.22 g/mol. IUPAC: (2S)-2-amino-3-(1H-indol-3-yl)propanoic acid.

L-色氨酸的 CAS 号是多少？

L-色氨酸的 CAS 号为 73-22-3——化学文摘社 (CAS) 的唯一标识符。

L-色氨酸的分子式是什么？

分子式: C11H12N2O2. 摩尔质量: 204.22 g/mol. logP (XLogP3): -1.1. PSA: 79.1 Å².

在哪里可以购买L-色氨酸？

L-色氨酸在我们的商店有售。查看产品：https://epchems.online/products/l-tryptophan/

L-色氨酸的化学数据来自哪里？

L-色氨酸的化学数据来自权威来源：PubChem (NIH), ChEMBL (EBI)。 PubChem CID: 6305. 符合 CLP 法规（EC 1272/2008），依据 CC-BY 4.0 许可提供。

L-色氨酸

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

关于 L-色氨酸

L-色氨酸 是一种化学品，登记号为 CAS 73-22-3，分子式为 C₁₁H₁₂N₂O₂，摩尔质量为 204.22 g/mol。

该分子包含 27 个原子，通过 28 个化学键连接。该化合物的完整系统 IUPAC 名称为 (2S)-2-amino-3-(1H-indol-3-yl)propanoic acid。上方的交互式 3D 模型可查看原子的空间排列——您可以用鼠标旋转、用滚轮缩放，并在骨架 / 球棍 (Ball & Stick) / 空间填充 (Space Fill) 显示模式之间切换。

在理化性质方面，分配系数 logP = -1.1 (负值，亲水性化合物)，极性表面积 PSA = 79.1 Å²，3 个氢键供体和 3 个氢键受体。这些参数对于评估生物利用度以及与生物分子的相互作用至关重要。

该化合物的化学数据来自 PubChem（NIH NLM NCBI），全球最大的化学数据库之一。所有信息均自动更新，并附有符合 CLP 法规（EC 1272/2008）的 GHS 危险说明翻译。上方的小部件可用于教育、研究和商业用途。

理化性质

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 ↗

科学文献

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.

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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 ↗

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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 ↗

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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 ↗

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pH regulates gut bacterial tryptophan metabolism.

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

Open AccessDOI ↗PubMed ↗PDF ↗

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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 ↗

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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 ↗

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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 ↗

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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 ↗

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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 ↗

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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 ↗

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(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.

同义词

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

数据来源

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

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