scholarly journals A review of microreactors based on slurry Taylor (segmented) flow

2021 ◽  
pp. 117040
Author(s):  
Zhengbiao Peng ◽  
Guichao Wang ◽  
Behdad Moghtaderi ◽  
Elham Doroodchi
Keyword(s):  
Segmented Flow

scholarly journals Compact Miniaturized Bioluminescence Sensor Based on Continuous Air-Segmented Flow for Real-Time Monitoring: Application to Bile Salt Hydrolase (BSH) Activity and ATP Detection in Biological Fluids

Chemosensors ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 122
Author(s):  
Aldo Roda ◽  
Pierpaolo Greco ◽  
Patrizia Simoni ◽  
Valentina Marassi ◽  
Giada Moroni ◽  
...  
Keyword(s):  
Bile Salt ◽  
Light Emission ◽  
Ex Vivo ◽  
Biological Fluids ◽  
Low Cost ◽  
Bile Salt Hydrolase ◽  
Segmented Flow ◽  
Active Substrate ◽  
Flat Spiral ◽  
Bsh Activity

A simple and versatile continuous air-segmented flow sensor using immobilized luciferase was designed as a general miniaturized platform based on sensitive biochemiluminescence detection. The device uses miniaturized microperistaltic pumps to deliver flows and compact sensitive light imaging detectors based on BI-CMOS (smartphone camera) or CCD technology. The low-cost components and power supply make it suitable as out-lab device at point of need to monitor kinetic-related processes or ex vivo dynamic events. A nylon6 flat spiral carrying immobilized luciferase was placed in front of the detector in lensless mode using a fiber optic tapered faceplate. ATP was measured in samples collected by microdialysis from rat brain with detecting levels as low as 0.4 fmoles. The same immobilized luciferase was also used for the evaluation of bile salt hydrolase (BSH) activity in intestinal microbiota. An aminoluciferin was conjugatated with chenodeoxycholic acid forming the amide derivative aLuc-CDCA. The hydrolysis of the aLuc-CDCA probe by BSH releases free uncaged aminoluciferin which is the active substrate for luciferase leading to light emission. This method can detect as low as 0.5 mM of aLuc-CDCA, so it can be used on real faecal human samples to study BSH activity and its modulation by diseases and drugs.

Characterization of slug formation towards the performance of air-liquid segmented flow

2019 ◽  
Vol 207 ◽  
pp. 1288-1298 ◽  
Author(s):  
Maren Termühlen ◽  
Benedikt Strakeljahn ◽  
Gerhard Schembecker ◽  
Kerstin Wohlgemuth
Keyword(s):  
Segmented Flow

Synthesis of quantum dot nanocrystals and plasmonic nanoparticles using a segmented flow reactor

2017 ◽  
Vol 122 (1) ◽  
pp. 48-51 ◽  
Author(s):  
R. C. Mbwahnche ◽  
L. B. Matyushkin ◽  
O. A. Ryzhov ◽  
O. A. Aleksandrova ◽  
V. A. Moshnikov
Keyword(s):  
Quantum Dot ◽  
Flow Reactor ◽  
Plasmonic Nanoparticles ◽  
Segmented Flow

Liquid–Solid Mass Transfer for Microchannel Suspension Catalysis in Gas–Liquid and Liquid–Liquid Segmented Flow

2015 ◽  
Vol 54 (17) ◽  
pp. 4699-4708 ◽  
Author(s):  
Anne-Kathrin Liedtke ◽  
Frederik Scheiff ◽  
Frédéric Bornette ◽  
Régis Philippe ◽  
David W. Agar ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Solid Mass ◽  
Segmented Flow

scholarly journals Evaluation of the nitrate and nitrite content of vegetables commonly grown in Slovenia

2017 ◽  
Vol 12 (2) ◽  
Author(s):  
Veronika Kmecl ◽  
Tea Knap ◽  
Dragan Žnidarčič
Keyword(s):  
European Union ◽  
Human Body ◽  
Daily Intake ◽  
Agricultural Area ◽  
Segmented Flow ◽  
Maximum Permissible Level ◽  
Eu Legislation ◽  
Permissible Level ◽  
Nitrate And Nitrite ◽  
Nitrite Content

Nitrate (NO<sub>3</sub><sup>–</sup>) and nitrite (NO<sub>2</sub><sup>–</sup>) levels of a total 1195 samples of nine different vegetables (lettuce, potato, cabbage, carrot, string beans, tomato, cucumber, cauliflower and pepper) collected at several locations of an intensive agricultural area in Slovenia were analysed during a period of 13 years. The content of NO<sub>2</sub><sup>–</sup> and NO<sub>3</sub><sup>–</sup> ions in commercial mature samples was determined using a segmented flow analyser. The average NO<sub>3</sub><sup>–</sup> content was the highest in lettuce (962 mg/kg), cabbage (795 mg/kg), string beans (298 mg/kg), carrot (264 mg/kg), cauliflower (231 mg/kg), potato (169 mg/kg) and was moderately high in cucumber (93 mg/kg) and pepper (69 mg/kg). A low NO<sub>3</sub><sup>–</sup> content was found in tomato (2<sup>–</sup> did not exceed 0.5 mg/kg, with the exception of potato (1.08 mg/kg). Six samples of lettuce exceeded the maximum permissible level of NO<sub>3</sub><sup>–</sup> according to current European Union (EU) legislation. Based on the results of our investigation, we assessed the approximate daily intake (DI) of NO<sub>3</sub>– and NO<sub>2</sub><sup>–</sup> to human body. The results indicated that with the consumption of potato, the daily intake per inhabitant is close to the acceptable DI permitted in EU.

Digital reaction technology by micro segmented flow—components, concepts and applications

2004 ◽  
Vol 101 (1-3) ◽  
pp. 201-216 ◽  
Author(s):  
J.M Köhler ◽  
Th Henkel ◽  
A Grodrian ◽  
Th Kirner ◽  
M Roth ◽  
...  
Keyword(s):  
Segmented Flow ◽  
Flow Components

scholarly journals Segmented flow coil equilibrator coupled to a proton-transfer-reaction mass spectrometer for measurements of a broad range of volatile organic compounds in seawater

Ocean Science ◽  
2019 ◽  
Vol 15 (4) ◽  
pp. 925-940 ◽  
Author(s):  
Charel Wohl ◽  
David Capelle ◽  
Anna Jones ◽  
William T. Sturges ◽  
Philip D. Nightingale ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Gas Exchange ◽  
Proton Transfer ◽  
Organic Compounds ◽  
Mass Spectrometer ◽  
Transfer Reaction ◽  
Proton Transfer Reaction ◽  
Reaction Mass ◽  
Segmented Flow ◽  
Volatile Organic

Abstract. We present a technique that utilises a segmented flow coil equilibrator coupled to a proton-transfer-reaction mass spectrometer to measure a broad range of dissolved volatile organic compounds. Thanks to its relatively large surface area for gas exchange, small internal volume, and smooth headspace–water separation, the equilibrator is highly efficient for gas exchange and has a fast response time (under 1 min). The system allows for both continuous and discrete measurements of volatile organic compounds in seawater due to its low sample water flow (100 cm3 min−1) and the ease of changing sample intake. The equilibrator setup is both relatively inexpensive and compact. Hence, it can be easily reproduced and installed on a variety of oceanic platforms, particularly where space is limited. The internal area of the equilibrator is smooth and unreactive. Thus, the segmented flow coil equilibrator is expected to be less sensitive to biofouling and easier to clean than membrane-based equilibration systems. The equilibrator described here fully equilibrates for gases that are similarly soluble or more soluble than toluene and can easily be modified to fully equilibrate for even less soluble gases. The method has been successfully deployed in the Canadian Arctic. Some example data from underway surface water and Niskin bottle measurements in the sea ice zone are presented to illustrate the efficacy of this measurement system.

Sign in / Sign up

Export Citation Format

Share Document