Comparative sensitivity analysis of integrated optical waveguides for near-infrared volatile organic compounds with 1ppb detection

2014 ◽  
Author(s):  
Wei-Cheng Lai ◽  
Yi Zou ◽  
Swapnajit Chakravarty ◽  
Liang Zhu ◽  
Ray T. Chen
Keyword(s):  
Sensitivity Analysis ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Optical Waveguides ◽  
Near Infrared ◽  
Comparative Sensitivity ◽  
Integrated Optical ◽  
Volatile Organic ◽  
Integrated Optical Waveguides

Near infrared chemo-responsive dye intermediaries spectra-based in-situ quantification of volatile organic compounds

2018 ◽  
Vol 254 ◽  
pp. 597-602 ◽  
Author(s):  
Felix Y.H. Kutsanedzie ◽  
Lin Hao ◽  
Song Yan ◽  
Qin Ouyang ◽  
Quansheng Chen
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Near Infrared ◽  
Volatile Organic

scholarly journals Microbial Volatile Organic Compounds from Tempered and Incubated Grain Mediate Attraction by a Primary but Not Secondary Stored Product Insect Pest in Wheat

2021 ◽  
Author(s):  
Taylor Van Winkle ◽  
Marco Ponce ◽  
Hannah Quellhorst ◽  
Alexander Bruce ◽  
Chloe E. Albin ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Near Infrared ◽  
Insect Pest ◽  
Behavioral Effect ◽  
Rhyzopertha Dominica ◽  
Grain Moisture ◽  
Grain Damage ◽  
Volatile Organic ◽  
Microbial Volatile Organic Compounds

AbstractThere has been a dearth of research elucidating the behavioral effect of microbially-produced volatile organic compounds on insects in postharvest agriculture. Demonstrating attraction to MVOC’s by stored product insects would provide an additional source of unique behaviorally-relevant stimuli to protect postharvest commodities at food facilities. Here, we assessed the behavioral response of a primary (Rhyzopertha dominica) and secondary (Tribolium castaneum) grain pest to bouquets of volatiles produced by whole wheat that were untempered, or tempered to 12%, 15%, or 19% grain moisture and incubated for 9, 18, or 27 days. We hypothesized that MVOC’s may be more important for the secondary feeder because they signal that otherwise unusable, intact grains have become susceptible by weakening of the bran. However, contrary to our expectations, we found that the primary feeder, R. dominica, but not T. castaneum was attracted to MVOC’s in a wind tunnel experiment, and in a release-recapture assay using commercial traps baited with grain treatments. Increasing grain moisture resulted in elevated grain damage detected by near-infrared spectroscopy and resulted in small but significant differences in the blend of volatiles emitted by treatments detected by gas chromatography coupled with mass spectrometry (GC–MS). In sequencing the microbial community on the grain, we found a diversity of fungi, suggesting that an assemblage was responsible for emissions. We conclude that R. dominica is attracted to a broader suite of MVOC’s than T. castaneum, and that our work highlights the importance of understanding insect-microbe interactions in the postharvest agricultural supply chain.

Core-Based Intrinsic Fiber-Optic Absorption Sensor for the Detection of Volatile Organic Compounds

1995 ◽  
Vol 49 (3) ◽  
pp. 379-385 ◽  
Author(s):  
Gregory L. Klunder ◽  
Richard E. Russo
Keyword(s):  
Volatile Organic Compounds ◽  
Aqueous Solutions ◽  
Organic Compounds ◽  
Silicone Rubber ◽  
Near Infrared ◽  
Fiber Optic ◽  
Limit Of Detection ◽  
Broad Band ◽  
Near Ir ◽  
Volatile Organic

A core-based intrinsic fiber-optic absorption sensor has been developed and tested for the detection of volatile organic compounds. The distal ends of transmitting and receiving fibers are connected by a small cylindrical section of an optically clear silicone rubber. The silicone rubber acts both as a light pipe and as a selective membrane into which the analyte molecules can diffuse. The sensor has been used to detect volatile organics (trichloroethylene, 1,1-dichloroethylene, and benzene) in both aqueous solutions and in the vapor phase or headspace. Absorption spectra obtained in the near-infrared (near-IR) provide qualitative and quantitative information about the analyte. Water, which has strong broad-band absorption in the near-IR, is excluded from the spectra because of the hydrophobic properties of the silicone rubber. The rate-limiting step is shown to be the diffusion through the Nernstian boundary layer surrounding the sensor and not the diffusion through the silicone polymer. The rate of analyte diffusion into the sensor, as measured by the t90 values (the time required for the sensor to reach 90% of the equilibrium value), is 30 min for measurements in aqueous solutions and approximately 3 min for measurements made in the headspace. The limit of detection obtained with this sensor is approximately 1.1 ppm for trichloroethylene in an aqueous solution.

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