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関連する概念動画

IR and UV–Vis Spectroscopy of Aldehydes and Ketones01:29

IR and UV–Vis Spectroscopy of Aldehydes and Ketones

Infrared spectroscopy, also known as vibrational spectroscopy, is mainly used to determine the types of bonds and functional groups in molecules. In aldehydes and ketones, the carbonyl (C=O) bond shows an absorption around 1710 cm-1. The C=O bond vibration of an aldehyde occurs at lower frequencies than that of a ketone. In addition to the C=O absorption in an aldehyde, the aldehydic C–H bond also gives two peaks in the 2700–2800 cm-1 range. This absorption, coupled with the C=O stretching, is...
Labeling DNA Probes03:31

Labeling DNA Probes

DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...
IR and UV–Vis Spectroscopy of Carboxylic Acids01:28

IR and UV–Vis Spectroscopy of Carboxylic Acids

In IR spectroscopy of carboxylic acids, the C=O bond shows a characteristic band between 1710 and 1760 cm⁻¹, and the O–H bond exhibits a broad band between 2500 and 3300 cm⁻¹.
However, the stretching absorptions for the C=O bond vary depending on the structure of carboxylic acids. The C=O bond of the free carboxylic acids shows a higher stretching frequency, 1760 cm−1, while H-bonded carboxylic acids (dimers) exhibit stretching absorptions at a lower frequency, 1710 cm−1. The C=O bond of the...
Voltammetry: Stripping Methods01:13

Voltammetry: Stripping Methods

Anodic Stripping Voltammetry (ASV), Cathodic Stripping Voltammetry (CSV), and Adsorptive Stripping Voltammetry (AdSV) are electrochemical techniques used to determine trace amounts of analytes in solution. These methods involve applying a potential to an electrode and measuring the resulting current.
Anodic Stripping Voltammetry (ASV)
ASV is used to determine metals and metalloids at trace levels. It involves two steps: deposition and stripping. First, a negative potential is applied to the...
Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for electronic transitions. As a result...
Gas Chromatography: Types of Detectors-I01:21

Gas Chromatography: Types of Detectors-I

There are different types of detectors used in gas chromatography, each with its own specific properties that make it suitable for detecting certain types of analytes. The most commonly used detectors in GC are thermal conductivity detector (TCD), flame ionization detector (FID), and electron capture detector (ECD).
TCD is the earliest and most widely used detector that operates by measuring the changes in the thermal conductivity of the carrier gas. When a sample compound enters the detector,...

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関連する実験動画

Updated: May 28, 2026

Real-time In Vitro Monitoring of Odorant Receptor Activation by an Odorant in the Vapor Phase
09:53

Real-time In Vitro Monitoring of Odorant Receptor Activation by an Odorant in the Vapor Phase

Published on: April 23, 2019

VOCのコロリメトリックセンサー配列検出のためのプレオキシデーション.

Hengwei Lin1, Minseok Jang, Kenneth S Suslick

  • 1Department of Chemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, USA.

Journal of the American Chemical Society
|October 5, 2011
PubMed
まとめ

新しく開発されたプレ酸化法により,色測定センサーを用いた揮発性有機化合物 (VOC) の検出が著しく改善されています. この技術は,感度を改善し,室内の20のVOCの検出限界を下げ,正確な識別とモニタリングを支援します.

科学分野:

  • 環境化学 環境化学
  • アナリティカル・ケミストリー (Analytical Chemistry) とは
  • センサー技術 センサー技術

背景:

  • 揮発性有機化合物 (VOC) は,室内の空気の質に重大なリスクをもたらす.
  • 現在のVOC検出方法では,反応性が低い化合物に対する感度が欠けていることが多い.
  • カロリメトリックセンサー配列は,VOCモニタリングの可能性を秘めていますが,性能を改善する必要があります.

研究 の 目的:

  • コロリメトリックセンサ配列によるVOC検出を強化するために,使い捨てのプレ酸化技術を開発し,評価する.
  • 感度を改善し,室内のVOCの範囲の検出限界 (LODs) を低下させる.
  • 関連する曝露レベルでの一般的な室内のVOCの識別と差別を可能にします.

主な方法:

  • シリカ上にクロム酸を詰めたプレ酸化チューブを使用した.
  • VOCを含む蒸気流は,色測定センサ配列に到達する前に,前酸化チューブを通過しました.
  • プレオキシデーションの有無と有無のセンサー配列の性能を比較した.

主要な成果:

  • 前酸化技術は,より反応性が低いVOCに対する感受性を大幅に高めました.
  • 検出限界 (LODs) は平均で約300倍改善されました.

さらに関連する動画

Analyzing the Photo-oxidation of 2-propanol at Indoor Air Level Concentrations Using Field Asymmetric Ion Mobility Spectrometry
08:23

Analyzing the Photo-oxidation of 2-propanol at Indoor Air Level Concentrations Using Field Asymmetric Ion Mobility Spectrometry

Published on: June 14, 2018

関連する実験動画

Last Updated: May 28, 2026

Real-time In Vitro Monitoring of Odorant Receptor Activation by an Odorant in the Vapor Phase
09:53

Real-time In Vitro Monitoring of Odorant Receptor Activation by an Odorant in the Vapor Phase

Published on: April 23, 2019

Analyzing the Photo-oxidation of 2-propanol at Indoor Air Level Concentrations Using Field Asymmetric Ion Mobility Spectrometry
08:23

Analyzing the Photo-oxidation of 2-propanol at Indoor Air Level Concentrations Using Field Asymmetric Ion Mobility Spectrometry

Published on: June 14, 2018

  • このシステムは,IDLHとPELの濃度で,室内の20の一般的なVOCを成功裏に検出し,識別し,差別しました.
  • 平均LODは,それぞれのPELの1.4%でした.

    • 結論:

    • 使い捨てプリ酸化は,色測定センサーによるVOC検出を強化するための非常に効果的な方法です.
    • この技術は,室内のVOCを安全で危険なレベルにモニタリングする能力を大幅に改善します.
    • 強化されたセンサーシステムは,室内の空気の質の評価に敏感で差別的なツールを提供します.