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Environmental Laboratory Spectrometer Provides High Acquisition Speed
The latest miniature spectrometer from Ocean Optics offers high-sensitivity CMOS detector performance, an acquisition speed of up to 3,000 scans a second and on- board spectral buffering to ensure data integrity during reaction monitoring. The Ocean FX spectrometer is suitable for high-speed sorting and grading in production environments, measurement of transient events and reaction kinetics monitoring for drug development and similar applications.
Ocean FX is anchored by a high-sensitivity CMOS detector with good response in the UV, and available with interchangeable slits. Its on-board buffer holds up to 50,000 spectra, so users don’t miss a single data point during kinetics measurements. Also, Ocean FX allows users to operate the spectrometer via Gigabit Ethernet, Wi-Fi and USB.
Ocean FX is available in versions optimized for the UV-Vis (200-850 nm), Vis-NIR (350-1000 nm) and extended (200-1025 nm) wavelength ranges. Enhanced- sensitivity, and custom and OEM configurations are also available.
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An improved experience is waiting for customers who use the 50-mL disposable metals digestion cup, from Environmental Express, for their laboratory applications. The redesigned digestion cup, now The Ultimate Cup, boasts many new features for optimal performance.
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Increased wall strength provides more durability for digesting with concentrated acids. Graduation lines have been added to both sides of the cup making it easier to fill. The screw-thread profile has been redesigned with a tighter seal to eliminate leaks and engage the FlipMate® filtration system more securely. The Ultimate Cup is available with a liner-less cap to complement the current polyethylene-faced cap. A larger dimple on the bottom of the cup provides more stability for wobble-free use. A few features on the digestion cup remain the same. Still the industry’s cleanest digestion cup, The Ultimate Cup is molded from the same polypropylene resin that customers have come to trust. The company continues to certify its digestion cups for 68 elements—the most on the market—and an improved Certificate of Analysis for background metals and volume accuracy is included in every box purchased.
The Ultimate Cup is ideal for use with the Environmental Express® HotBlock® and AutoBlock® Digestion Systems.
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Redesigned Metals Digestion Cup is Now “The Ultimate Cup”
Ocean Optics has shown how highly-sensitive, trace-level Raman spectroscopy measurements can detect concentrations of insecticide that are less than a fiftieth of the level judged harmful to honeybees.
Using a real-world example related to the problem of honeybee population decline, the company demonstrated the power of RAM- SERS-SP Surface-Enhanced Raman Spectroscopy substrates’ proprietary gold-silver nanosponge alloy. By comparing the ability of new gold-silver substrates with that of traditional substrates to detect imidacloprid, an insecticide suspected to be dangerous to bee colonies, Ocean Optics scientists were able to demonstrate the enhanced sensitivity that RAM-SERS-SP substrates bring to Raman measurements.
SERS substrates amplify very weak Raman signals by many orders of magnitude, with measurements of SERS-active analytes possible at even parts- per-trillion levels. Silver-only SERS substrates work best with 532 nm Raman excitation, while gold substrates are better suited to 785 nm Raman systems. By combining the silver and gold on one substrate the new SERS nanosponge substrates perform well with either wavelength. When used with 638 nm Raman excitation, the nanosponge substrates are enhanced to an even higher level of sensitivity.
Recent high rates of honeybee loss have been investigated by US government regulators and other researchers. According to ongoing US Environmental Protection Agency (EPA) studies, the insecticide imidacloprid has been identified as a threat to commercial honeybee colonies, with the agency citing traces at concentration levels greater than 25 ppb as likely harmful to honeybees.
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To test the effectiveness of Ocean Optics substrates in detecting imidacloprid at these harmful trace levels, Ocean Optics scientists set up a lab experiment using the company’s gold nanoparticle and gold-silver nanosponge SERS substrates. They made a series of measurements using the gold nanoparticle substrates, in a setup with 785 nm Raman laser excitation, and a series of measurements using the gold-silver nanosponge substrates, in a setup with 638 nm Raman excitation.
In the test, the gold-silver nanosponge SERS substrates delivered the best results, detecting imidacloprid concentrations as low as 0.4 ppb (well within the 25 ppb concentration rate cited by the EPA as harmful to bees). The substrates high sensitivity and low background noise made it easier to discern Raman peaks at these very low- concentration levels.
Raman is a useful technique for fast, non- destructive analysis, with the enhanced sensitivity provided by SERS substrates allowing detection of trace levels of samples such as insecticides. Affordable and easy to use, the Ocean Optics SERS substrates are well suited to deployment in the lab or field. To read the full Honeybee Insecticide Detection application note, visit the Ocean Optics website.
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The Buzz Around Nanosponge SERS and Trace-Level Detection
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