share:

GC Multiresidue Pesticide Standard #9 (8 components)

Organophosphorus Compounds

..., botanicals, and herbals such as tea, ginseng, ginger, echinacea, and dietary supplements.Formulated ... , botanicals, and herbals such as tea, ginseng, ginger, echinacea, and dietary supplements.Ampul 9...

Pesticide Residue Cleanup SPE Cartridges

... in multiresidue pesticide analysis to remove matrix interferences.Excellent for cleanup of dietary supplement extracts....

GC Multiresidue Pesticide Standard #1 (16 components)

Organophosphorus Compounds

..., botanicals, and herbals such as tea, ginseng, ginger, echinacea, and dietary supplements.Formulated ... , botanicals, and herbals such as tea, ginseng, ginger, echinacea, and dietary supplements.Ampul 1...

GC Multiresidue Pesticide Standard #3 (25 components)

Organonitrogen Compounds

..., botanicals, and herbals such as tea, ginseng, ginger, echinacea, and dietary supplements.Formulated ... , botanicals, and herbals such as tea, ginseng, ginger, echinacea, and dietary supplements.Ampul 3...

GC Multiresidue Pesticide Standard #4 (28 components)

Organonitrogen Compounds

..., botanicals, and herbals such as tea, ginseng, ginger, echinacea, and dietary supplements.Formulated ... , botanicals, and herbals such as tea, ginseng, ginger, echinacea, and dietary supplements.Ampul 4...

GC Multiresidue Pesticide Standard #5 (34 components)

Organonitrogen Compounds

..., botanicals, and herbals such as tea, ginseng, ginger, echinacea, and dietary supplements.Formulated ... , botanicals, and herbals such as tea, ginseng, ginger, echinacea, and dietary supplements.Ampul 5...

GC Multiresidue Pesticide Standard #6 (18 components)

Synthetic Pyrethroid Compounds

..., botanicals, and herbals such as tea, ginseng, ginger, echinacea, and dietary supplements.Formulated ... , botanicals, and herbals such as tea, ginseng, ginger, echinacea, and dietary supplements.Ampul 6...

GC Multiresidue Pesticide Standard #7 (10 components)

Herbicide Methyl Esters

..., botanicals, and herbals such as tea, ginseng, ginger, echinacea, and dietary supplements.Formulated ... , botanicals, and herbals such as tea, ginseng, ginger, echinacea, and dietary supplements.Ampul 7...

GC Multiresidue Pesticide Standard #8 (24 components)

Organophosphorus Compounds

..., botanicals, and herbals such as tea, ginseng, ginger, echinacea, and dietary supplements.Formulated ... , botanicals, and herbals such as tea, ginseng, ginger, echinacea, and dietary supplements.Ampul 8...

GC Multiresidue Pesticide Standard #2 (40 components)

Organochlorine Compounds

..., botanicals, and herbals such as tea, ginseng, ginger, echinacea, and dietary supplements.Formulated ... , botanicals, and herbals such as tea, ginseng, ginger, echinacea, and dietary supplements.Ampul 2...

GC Multiresidue Pesticide Kit

..., botanicals, and herbals such as tea, ginseng, ginger, echinacea, and dietary supplements...

Developing New Methods for Pesticides in Dietary Supplements (PDF 4634kB)

...New requirements for dietary supplements to be manufactured under cGMP regulations have created . Introduction Recently the FDA announced that makers of dietary supplements (e.g. vitamins, herbal ... dietary supplements, quechers, cSPE, GMP, PAM 303, pesticides, multiresidue, sample prep...

ChromaBLOGraphy: Pesticides in Dietary Supplements

I was at the Recent Advances in Food Analysis conference in Prague last week and presented work on analyzing pesticides in dietary supplements, a very important subject given that FDA is moving to regulate these products. They are very complex herbal, botanical, etc. materials, which makes looking for trace level components very tricky. My colleagues, [...]

Restek GCxGC Columns for Comprehensive Two-Dimensional Gas Chromatography

Restek is your one source for 2D gas chromatography! Also known as GCxGC, comprehensive two-dimensional gas chromatography is a powerful technique th...

News: Developing New Methods for Pesticides in Dietary Supplements

Author(s): Julie Kowalski, Michelle Misselwitz, Jason Thomas,  Jack Cochran Published By: Food Safety Magazine Issue: February/March 2012 Year of Publication: 2012 Link: http://www.foodsafetymagazine.com/article.asp?id=3876&sub=sub1 Abstract: New requirements for dietary supplements to be manufactured under current Good Manufacturing Practices (cGMP) regulations have created a … Continue reading

ChromaBLOGraphy: Michelle Misselwitz Does Dietary Supplements at Florida Pesticide Residue Workshop

No, I’m not revealing any of Michelle’s personal habits here. But I do want to say what a great job she did talking about QuEChERS, cartridge SPE, and GCxGC-TOFMS for the analysis of pesticides in dietary supplements at the Restek vendor seminar at FPRW last night (Sunday). Her talk was visually stimulating, great graphics, and [...]

Evaluation of Dispersive and Cartridge Solid Phase Extraction (SPE) Cleanups for Multiresidue Pesticides in QuEChERS Extracts of Finished Tobacco Using GCxGC-TOFMS (PDF 4409kB)

... for dry commodities, such as dietary supplements [4]. This approach utilized a modified Qu for enhanced cleanup capacity for complex matrices like dietary supplements and tobacco, but it requires...

ChromaBLOGraphy: Is There Vitamin P in your Dietary Supplement? Use QuEChERS and find out.

My colleagues Jason Thomas, Michelle Misselwitz, Julie Kowalski and I recently developed a QuEChERS extraction approach for pesticides (Vitamin P) in dietary supplements, including dandelion, ginseng, barberry, sage, yellow dock, green tea, and finished products (blends of individual botanicals). We found that dispersive solid phase extraction (dSPE) did not have the capacity to clean up [...]

News: Evaluation of QuECheRS, Cartridge SPE Cleanup, and Gas Chromatography Time-of-Flight Mass Spectrometry for the Analysis of Pesticides in Dietary Supplements

Author(s): Julie Kowalski, Michelle Misselwitz, Jason Thomas, Jack Cochran Published By: LCGC North America Year of Publication: 2010 Link: http://www.chromatographyonline.com/lcgc/Articles/Analysis-of-Pesticides-in-Dietary-Supplements/ArticleStandard/Article/detail/697436 Abstract: The FDA is responsible for regulation of dietary supplements as foodstuffs through the 1994 Dietary Supplement Health and Education … Continue reading

Restek GCxGC Columns: Your One Source for 2D Gas Chromatography (PDF 9170kB)

..., fragrance, natural products, tobacco, metabolomics, and dietary supplements. Restek’s GCxGC secondary GC with orthogonal Restek columns is a powerful way to handle complex samples like dietary supplement extracts. Note...

ChromaBLOGraphy: Restek Vendor Seminar at Florida Pesticide Residue Workshop – Dietary Supplements and Flavor Tripping, aka Innovation and Fun

I’ve only worked at Restek just over 3 years, but I was a customer since the late 80s when I first met Paul Silvis, Joe Walsh, and Dave Shelow at the International Symposium on Capillary Chromatography.  As I interacted with Restek during my career, I noticed two important things about the company.  They liked to [...]

News: Analysis of Pesticides in Dietary Supplements: Evaluation of QuEChERS, Cartridge SPE Clean-Up, and Gas Chromatography Time-of-Flight Mass Spectrometry

Author(s): Julie Kowalski, Michelle Misselwitz, Jason Thomas, Jack Cochran Published By: Agro FOOD INDUSTRY Hi-tech today Issue: Sept./Oct. Focus on Food Analysis supplement, vol. 22, no. 5 Year of Publication: 2011 Link: http://agro-food-industry.teknoscienze.com/testata.asp?id_testata=244&folder=supplements Abstract: New requirements for dietary supplements to … Continue reading

Rapid Characterization of Garlic Volatiles—No Sample Prep Required! Using Headspace GC/MS and an Rxi-5ms Capillary Column

... by the dietary supplements industry to detect garlic volatiles that may affect the acceptability of supplements , garlic supplements have gained popularity for boosting immune and cardiovascular health. Determining ... Chromatographic methods for garlic and garlic powder are used by the food and dietary supplement...

Residual Pesticides Analysis of Botanical Ingredients Using Gas Chromatography Triple Quadrupole Mass Spectrometry

...oration. Introduction The use of dietary supplements is increasing in the United States. These dietary supplements are made from various dried botanicals, which may contain residual pesticides from agric ... Dietary supplements, which are consumed worldwide, are made from various botanical ingredients...

Residual Pesticides Analysis of Botanical Ingredients Using Gas Chromatography Triple Quadrupole Mass Spectrometry (PDF 2566kB)

...Introduction The use of dietary supplements is increasing in the United States. These dietary analysis to remove matrix interferences. • Excellent for cleanup of dietary supplement extracts. Rxi-5ms...

ChromaBLOGraphy: Julie Kowalski on the Front Lines at the European Pesticide Residue Workshop

The photo shows Restek’s own Julie Kowalski, Food Innovations Chemist, discussing her European Pesticide Residue Workshop Poster, “Evaluation of the QuEChERS Sample Preparation Method and Comprehensive Two-Dimensional Gas Chromatography for the Analysis of Pesticides in Dietary Supplements”, with an interested workshop attendee.  Both QuEChERS and GCxGC (comprehensive two-dimensional GC) are popular techniques at the conference, [...]

News: Residual Pesticides Analysis of Botanical Ingredients Using Gas Chromatography Triple Quadrupole Mass Spectrometry

Author(s): Riki Kitano1, Tairo Ogura1, Nicole Lock1, Robert Clifford1, Julie Kowalski2, Jack Cochran2, Dan Li2 1. Shimadzu Scientific Instruments, Inc. 2. Restek Corporation Published By: Restek Corporation Year of Publication: 2019 Link: www.restek.com/Technical-Resources/Technical-Library/Foods-Flavors-Fragrances/fff_FSAR3080-UNV Abstract: Dietary supplements, which are consumed worldwide, … Continue reading

News: Fortify or Calibrate for 203 Pesticides by GC-MS/MS With This Single Restek® CRM Kit

GC-MS/MS is the technique of choice for analyzing pesticide residues in many fruits, vegetables, botanicals, and herbals like tea, ginseng, ginger, Echinacea, and dietary supplements. And Restek’s new GC-MS/MS pesticide reference standards kit contains over two hundred compounds pulled from … Continue reading

ChromaBLOGraphy: High Quality Analysis of Pesticides in Marijuana using QuEChERS, Cartridge SPE Cleanup, and GCxGC-TOFMS

Recently we reported on what we believe is the first application of QuEChERS for marijuana, using it for potency analysis with GCxGC-TOFMS.  Ultimately, the plan was to determine pesticides via the QuEChERS approach, combining it with cartridge SPE cleanup as we did for dietary supplements, since sample complexity would defeat the typical dispersive SPE cleanup [...]

Rxi GC Columns Sales Sheet (PDF 3173kB)

..., fragrance, natural products, tobacco, metabolomics, and dietary supplements. Restek’s GCxGC secondary...

Growing Analytical Solutions for Cannabis Testing: Innovative Products and Expertise for Fast, Accurate, Reliable Results (PDF 8494kB)

... matrix interferences. • Excellent for cleanup of dietary supplement extracts. PSA–primary and secondary...

ChromaBLOGraphy: Florida Pesticide Residue Workshop – July 18-21

If you are a pesticide residue chemist, or you have a hankering to learn about veterinary drug analyses, then this meeting could be for you.  In addition, FPRW is sponsoring a special session on Sun, July 18, for discussion of analytical issues surrounding the recent BP Gulf oil spill.  For that, we are pleased to have [...]

ChromaBLOGraphy: Read This Before You Go to PittCon 2010 in Orlando!

The title is akin to “Free Beer” to get you to click in, but I invite my colleagues to visit me and Restek at PittCon. Due to space limitations, I only tout my presentations here (yeah right Jack, it’s because of space limitations…). I’m heavily invested in QuEChERS. Poster 660-2 P, Mon, comparing GPC to [...]

ChromaBLOGraphy: Large volume splitless injection WITHOUT a PTV!

Recently while trying to create backflash in an Agilent splitless injector, I noted linear compound responses as I injected up to 25µL for PAHs from naphthalene to benzo(ghi)perylene! I went to the literature (note to self: start with the literature) and found papers from Magni and Porzano, and Grob’s group, where they termed the technique [...]

ChromaBLOGraphy: Potions, Lotions and Labels…Oh my!

Like a lot of women, I have a bathroom full of lotions, perfumes and other potions. Many of these products contain natural ingredients like botanicals and essential oils. Not all things from Mother Nature are safe (I guess she can have a temper!) and consumers are becoming wise to this. The FDA is cracking down [...]

ChromaBLOGraphy: Analyzing pesticides in herbal tea using QuEChERS and GCxGC-TOFMS of course!

Herbal tea, a non-caffeinated drink made from plants, herbs, or spices has been used throughout history for its potential medicinal benefit.   Various herbal material is mixed depending on the desired medicinal or flavor properties for the tea.   As with any plant based commodity, there is the potential for pesticide residues to remain in the final […]

Evaluation of Dispersive and Cartridge Solid Phase Extraction (SPE) Cleanups for Multiresidue Pesticides in QuEChERS Extracts of Finished Tobacco Using GCxGC-TOFMS

... for dry commodities, such as dietary supplements [4]. This approach utilized a modified Qu for enhanced cleanup capacity for complex matrices like dietary supplements and tobacco, but it requires...

ChromaBLOGraphy: Restek at the Florida Pesticide Residue Workshop Starting July 18

  Join me and my colleagues Michelle Misselwitz, Julie Kowalski, and Jonathan Keim at the Florida Pesticide Residue Workshop next week for some fun science.  In addition to the offerings below, we’ll also be handing out some sweet treats (hint: one of my co-workers has the same initials) at our exhibition booth.  Restek Seminar   Sunday, July 18, [...]

ChromaBLOGraphy: No Prescription Needed: Pharmaceuticals in Your Supplements

There are many fake products out there including foods like “virgin” olive oil, honey and branded liquor. I hear a lot about these because my work focuses on food and food safety. Food fraud seems to be on the rise…at the very least governments and researchers are devoting more resources to finding and tracking incidents. [...]

ChromaBLOGraphy: Are fatty acids overwhelming your QuEChERS dSPE PSA cleanup and causing issues in your GC analysis? Get more cleanup capacity with cartridge SPE cleanup!

Fatty acids are important molecules in the human body because they are used as a source of fuel.  There are many food sources of both “healthy” and “unhealthy” fatty acids.  Many sources of dietary fatty acids come from fruits, vegetables, seeds, nuts, and animal fats.  The QuEChERS methodology was developed to analyze pesticides in fruits […]

ChromaBLOGraphy: 3rd Multidimensional Chromatography and GCxGC Workshop at Ontario Ministry of Environment in Toronto

The 3rd Multidimensional Chromatography and GCxGC Workshop took place at the Ontario Ministry of the Environment (MOE) in Toronto, Ontario, Canada on January 10, 2012.  The excellent lecture program was enjoyed by over 150 attendees and is listed below.  Restek helped sponsor the workshop, and contributed three speakers this year due to our extensive work with [...]

ChromaBLOGraphy: First QuEChERS Extraction of Marijuana with GCxGC-TOFMS Analysis, dudes…

My Restek colleagues Julie Kowalski, Michelle Misselwitz, and Amanda Rigdon, along with Professor Frank Dorman from The Pennsylvania State University (PSU), report here what we believe is the first QuEChERS extraction of marijuana, with subsequent analysis using GCxGC-TOFMS.  We were assisted in this task by Randy Hoffman, a Police Officer Specialist/Evidence Technician at PSU, who [...]

ChromaBLOGraphy: Modifying QuEChERS for complicated matrices- Dry Samples

Before getting in to this discussion, I recommend reading my previous blog post first regarding classical applications for methods based on Quechers. https://blog.restek.com/quechers-dspe-selection-which-one-is-best/ QuEChERS methods were originally written to analyze pesticides in fruit and vegetable matrices, most of which have high water content and low fat content. More recently, the technique has been used for […]

For advanced chromatogram searching, please check out our Chromatogram Library Search Tool.

Pesticides in Dietary Supplements (Zoom of GCxGC-TOFMS Contour Plot)

GC_FF1188

Column: Rxi-5Sil MS 30 m, 0.25 mm ID, 0.25 µm (cat.# 13623)Rtx-200 1.5 m, 0.18 mm ID, 0.20 µm (cat.# 45001)
Injector: Splitless
Detector: TOFMS

Pesticides in Dietary Supplements (GCxGC-TOFMS Contour Plot)

GC_FF1187

Column: Rxi-5Sil MS 30 m, 0.25 mm ID, 0.25 µm (cat.# 13623)Rtx-200 1.5 m, 0.18 mm ID, 0.20 µm (cat.# 45001)
Injector: Splitless
Detector: TOFMS

Dandelion Root QuEChERS Extract Cleaned with Cartridge SPE (GCxGC-TOFMS Contour Plot)

GC_FF1189

Column: Rxi-5Sil MS 30 m, 0.25 mm ID, 0.25 µm (cat.# 13623)Rtx-200 1.5 m, 0.18 mm ID, 0.20 µm (cat.# 45001)
Injector: Splitless
Detector: TOFMS

Sage QuEChERS Extract Cleaned with Cartridge SPE (GCxGC-TOFMS Contour Plot)

GC_FF1190

Column: Rxi-5Sil MS 30 m, 0.25 mm ID, 0.25 µm (cat.# 13623)Rtx-200 1.5 m, 0.18 mm ID, 0.20 µm (cat.# 45001)
Injector: Splitless
Detector: TOFMS

Dietary Supplement (Finished Product) QuEChERS Extract Cleaned with Cartridge SPE (GCxGC-TOFMS Contour Plot)

GC_FF1191

Column: Rxi-5Sil MS 30 m, 0.25 mm ID, 0.25 µm (cat.# 13623)Rtx-200 1.5 m, 0.18 mm ID, 0.20 µm (cat.# 45001)
Injector: Splitless
Detector: TOFMS

Sage QuEChERS Extract Cleaned with Cartridge SPE (Zoom of GCxGC-TOFMS Contour Plot)

GC_FF1192

Column: Rxi-5Sil MS 30 m, 0.25 mm ID, 0.25 µm (cat.# 13623)Rtx-200 1.5 m, 0.18 mm ID, 0.20 µm (cat.# 45001)
Injector: Splitless
Detector: TOFMS

Hexachlorocyclohexanes in Sage QuEChERS Extract (Zoom of GCxGC-TOFMS Contour Plot)

GC_FF1194

Column: Rxi-5Sil MS 30 m, 0.25 mm ID, 0.25 µm (cat.# 13623)Rtx-200 1.5 m, 0.18 mm ID, 0.20 µm (cat.# 45001)
Injector: Splitless
Detector: TOFMS

Restek Domestic Customer Service

Subject

Message

Your Full Name

Your Email

Company Name

Address

Spam Block (Please leave this blank)

all fields required

Thank you

Your message has been sent. We will be in touch shortly.

Message not sent

Sorry, your message could not be sent at this time. Please try again later, or contact Restek or your local Restek representative via phone.

www.restek.com/Contact-Us