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Updated: Feb 20, 2026

Characterization of Synthetic Polymers via Matrix Assisted Laser Desorption Ionization Time of Flight MALDI-TOF Mass Spectrometry
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Characterization of Synthetic Polymers via Matrix Assisted Laser Desorption Ionization Time of Flight MALDI-TOF Mass Spectrometry

Published on: June 10, 2018

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18-Crown-6エーテルは,Escherichia coliで合成されたポリ (((3-ヒドロキシブチラート) の分子量を増加させます

Seiya Tanaka1, Hiroshi Kikukawa2, Hirotsugu Nakai1

  • 1Graduate School of Chemical Sciences and Engineering, Hokkaido University, N13W8, Kitaku, Sapporo 060-8628, Japan.

Journal of bioscience and bioengineering
|February 18, 2026
PubMed
まとめ

再結合されたEscherichia coli培養に18-crown-6エーテル (18c6) を添加すると,分子量が大幅に増加します. この方法は,高分子量ポリヒドロキシアルカノ酸 (PHAs) を生産するための新しいアプローチを提供します.

キーワード:
チェーン転送エージェントクラウンエーサーは,クラウンエーサーのことです.分子重量分子の重量についてポリエステルはポリエステルです.ポリヒドロキシブチラート (Polyhydroxybutyrate) とは

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Microwave-assisted Functionalization of Polyethylene glycol and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation15:33

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Crown Ethers02:36

Crown Ethers

Crown ethers are cyclic polyethers that contain multiple oxygen atoms, usually arranged in a regular pattern. The first crown ether was synthesized by Charles Pederson while working at DuPont in 1967. For this work, Pedersen was co-awarded the 1987 Nobel Prize in Chemistry. Crown ethers are named using the formula x-crown-y, where x is the total number of atoms in the ring and y is the number of ether oxygen atoms. The term 'crown' refers to the crown-like shape that these ether molecules...
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Physical Properties of Ethers

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An ether molecule has a net dipole moment due to the polarity of C–O bonds. Subsequently, boiling points of ethers are lower than those of alcohols of comparable molecular weight and slightly higher than those of hydrocarbons of comparable molecular weight (Table 1).
Ethers can act as hydrogen bond acceptors, making them more water-soluble than hydrocarbons, but since ethers cannot act as hydrogen bond donors, they are much less soluble in water than alcohols. Ethers are considered...
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Molecular Weight of Step-Growth Polymers

Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
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The extent of the...
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Polymers: Molecular Weight Distribution

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Polymers: Defining Molecular Weight

Unlike small molecules with definite molecular weights, polymers are a mixture of individual polymer chains of varying lengths, each with a unique molecular weight.  So, the molecular weight of a polymer is expressed as an average value based on the average size of the polymer chains. The two most common forms of averages used for polymers are the number average molecular weight and weight average molecular weight.
The number average molecular weight (Mn) is the summation of the number...
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