Fast arsenic speciation analysis of wines and rice with LC-ICP-QQQ
Poster Dec 05, 2017
Patrick Gray, Courtney Tanabe, Susan E. Ebeler, Jenny Nelson.
This fit-for-purpose method was designed in response to recent and proposed food standards, both international and national, that limit inorganic arsenic rather than total, organic, or individual arsenic species such as arsenite (AsIII) and arsenate (AsV). In this method, AsIII is intentionally oxidized to AsV with H2O2 during sample preparation, converting all inorganic arsenic (the sum of AsIII and AsV) to the AsV form. Arsenic species were separated in less than 2 minutes using a short, narrow bore, 5 um chromatography column. This analysis time is 10x faster than the current FDA regulatory method. The use of O2 reaction gas with inductively coupled plasma triple quadrupole mass spectrometry (ICP-QQQ with MS/MS capability) avoided spectral interferences and dramatically increased sensitivity, allowing for low volume injections. The small injection volume and modified mobile phase composition mitigate non-spectral interferences such as carbon enhanced ionization. Furthermore, the shortened analysis time significantly increases sample throughput. Validation data from two laboratories demonstrate the method’s accuracy and reproducibility of both wine and rice matrices in a single analytical batch.
Results are presented that demonstrate the accuracy and reproducibility of the new method. The method was further validated using a wine matrix that was analyzed by two participating laboratories.
The method presented here has been shown to work for both wine and rice matrices. Runtime has been decreased to 2 minutes, which is a factor of 10x faster than previous methods. The method also showed improved sensitivity and limits of detection and quantification compared to the current FDA method. Small injection volumes and addition of methanol in the mobile phase increased robustness to non-spectral interferences and makes this method more suitable for wine speciation. If needed, analysis time and resolution could be further improved by decreasing injection volume, increasing mobile phase flow rate and using a small volume,fast-washout spray chamber.
IntelliXtract 2.0: Simplified Intelligent Component Extraction and DetectionPoster
*Simplified detection and Component Extraction algorithm from LC-MS and GC-MS datasets
*New improved algorithm based on ion threads
*Reduced number of parameters to select for analysis
*Reduced false positives leading to reduced analysis time
Analysis of Extract Drying Criteria for Oil & Grease Method 1664A/BPoster
Analysis of Extract Drying Criteria for Oil & Grease Method 1664A/BREAD MORE
Role of Elevated Airway Glucose (and Other Biochemicals) in Bacterial InfectionsPoster
Bacteria that live in the airways need something to eat: they mainly use host derived biochemicals, for example glucose. When levels of airway biochemicals are dysregulated, bacterial colonisation increases, enabling infection. We investigated how changes in airway glucose effect bacterial infection.READ MORE
Comments | 1 ADD COMMENT
bella weny | Mar 15, 2018
Do anyone still doubt natural herbs? I've seen the great importance of natural herbs and the wonderful work they have done in people's lives. I wonder why people still spend their money on surgery, injections and drugs each time they are sick. Natural herbs can cure all kinds of illness including herpes, diabetics, asthma, HIV, hepatitis, etc. I've seen it with my own eyes. I was cured of HIV and my aunt and her husband were cured of herpes by Dr. Abaka who uses natural herbs to cure different kind of illness.Dr. Abaka has prove to the world that natural herbs can cure all illness and he cured countless people using natural herbs. I know is hard to believe but am a living testimony. There is no harm trying herbs. He is also a spell caster, he cast spell to restore marriages back to normal, a good luck spell to prosper and excel in life. Contact Dr. Abaka email: email@example.com (phone/whatsap no): +2349063230051 https://drabakaspelltemple.wordpress.com.