delim
Foods, Flavors & Fragrances Solutions

Foods, Flavors & Fragrances Solutions

Labeled Pesticide Residue Internal Standards for Food Analysis

  • Isotopically labeled to provide the best approach for pesticide residue quantification.
  • Multiple options let you choose internal and surrogate standards that will mitigate matrix effects.
  • Economically priced and compatible with both LC-MS and GC-MS applications; even helpful for optimizing LC-MS/MS system performance.
  • Certified reference material (CRM) manufactured and QC-tested in Restek’s ISO-accredited labs—satisfy your ISO requirements.
  • Restek is your complete supplier for world-class food safety analysis: pesticide reference standard mixes and internal/surrogate standards, GC and LC columns, QuEChERS, and more!

MOSH/MOAH Standard (9 components)

  • Developed specifically for using LC coupled with GC-FID to accurately determine hydrocarbons found in mineral oils, which can migrate from packaging into food.
  • 9-component mix contains non-interfering internal standards as well as both mineral oil saturated hydrocarbon (MOSH) and mineral oil aromatic hydrocarbon (MOAH) markers to correctly cut fractions.
  • Certified reference material (CRM) manufactured and QC-tested in Restek’s ISO-accredited labs satisfies your ISO requirements.
  • Restek is your complete supplier for world-class MOSH/MOAH analysis: reference standards, Allure® silica LC columns, Rxi®-5Sil MS GC columns, accessories, and more!

Everything you need for QuEChERS!

  • Fast, simple sample extraction and cleanup using dSPE—Fourfold increases in sample throughput.
  • Complete offering for AOAC and European Methods.
  • Single and multiple component standards as specified in EN Method 15662.

Rxi®-5Sil MS Columns (fused silica)

(low polarity phase; Crossbond® 1,4-bis(dimethylsiloxy)phenylene dimethyl polysiloxane)

  • Engineered to be a low-bleed GC-MS column.
  • Excellent inertness for active compounds.
  • General-purpose columns—ideal for GC-MS analysis of semivolatiles, polycyclic aromatic compounds, chlorinated hydrocarbons, phthalates, phenols, amines, organochlorine pesticides, organophosphorus pesticides, drugs, solvent impurities, and hydrocarbons.
  • Temperature range: -60 °C to 350 °C.

    Click here for more information on our Rxi® columns.

Flip Seal® Dual Vespel® Ring Inlet Seals

Restek Innovation! Patented.
Reversible Flip Seal® Inlet Seal—Same Cost, Extended Lifetime

  • Reversible, two-sided design allows significantly more analyses than other seals, at the same price—simply use, flip, then use again!
  • Vespel® ring embedded in top and bottom surface eliminates need for a washer.
  • Highly inert gold or Siltek®-deactivated seals reduce breakdown and adsorption of active compounds, maximizing component transfer to GC column.
  • Very little torque required to make seal—reduces operator variability.

    For frequently asked questions about our Flip Seal® inlet seals, click here.

    Note: The Flip Seal® inlet seal requires a special reducing nut adaptor fitting, which is included in the kit.

Thermal Desorption Unit Tubes

  • Variety of sorbents to collect a wide range of VOCs.
  • Available unconditioned or preconditioned and ready to sample.

Ultra Aqueous C18 Columns (USP L1)

particle size: 3 µm or 5 µm, spherical
pore size: 100 Å
carbon load: 15%
end-cap: no
pH range: 2.5 to 8
temperature limit: 80 °C
USP phase code: L1
phase category: modified C18
ligand type: proprietary polar modified and functionally bonded C18

Lamps

for Agilent HPLC Systems

Xenon Lamps

for Waters Detectors

Deuterium Lamps

for Waters Detectors

Introduction to QuEChERS Flash Player required

Jack Cochran, Director of New Business and Technology at Restek, gives a brief overview of the QuEChERS process, and how it can simplify your sample preparation workflow.

Analysis of Veterinary Drug Residues using a Unique HPLC Biphenyl Stationary Phase

Analysis of veterinary drug residues in milk using a QuEChERS approach and Biphenyl column is discussed. Better retention is achieved, compared to C18 or phenyl phases, improving separation of analytes and matrix components.

Narrated by Julie Kowalski, Foods, Flavors & Fragrances Applications Chemist. Length: 24 minutes

Technical Articles

Foods, Flavors & Fragrances

A Comprehensive Approach to Pesticide Residue Testing, Including Non-Target Analysis, for Fruits, Vegetables, and Nuts, Using QuEChERS, LC-MS/MS, and GCxGC-TOFMS

Food commodities that varied in water, fat, and pigment content were fortified with pesticides and processed using a QuEChERS sample preparation technique. Samples were analyzed by both GCxGC-TOFMS and LC-MS/MS, and good recoveries were obtained for most pesticides in most commodities.

Foods, Flavors & Fragrances

Increase Data Quality for Sulfonamide Residue Analysis by HPLC and UHPLC Using Unique Biphenyl Column Selectivity

The unique selectivity and high retention of Biphenyl columns produce complete separation of sulfonamide residues and benefit both UV and MS detection. In addition, Biphenyl columns in a UHPLC format allow faster sample throughput when testing for these antibiotics.

Editorial

Matrix Effects in Multi-Residue Pesticide Analysis When Using Liquid Chromatography-Tandem Mass Spectrometry

Matrix effects present a significant challenge to multi-residue pesticide analysis of food samples using LC/MS/MS. In this editorial, Dr. Kai Zhang, of the FDA Center for Food Safety and Applied Nutrition, discusses approaches that minimize matrix effects.

Foods, Flavors & Fragrances

Comparing Pesticide Residues in Amish and Commercially Grown Strawberries and Spinach Using QuEChERS, Various dSPE Sorbents, and GC-TOFMS

QuEChERS extraction, dSPE cleanup, and GC-TOFMS analysis were used to assess pesticide residue levels in strawberry and spinach from both commercial and Amish growers. Various dSPE sorbent products were compared to determine which were most effective.

General Interest

Pesticides in Dietary Supplements: Advantages of QuEChERS vs. PAM 303

Restek has developed the first QuEChERS-based method for determining pesticide residues in dietary supplements. This simple, cost-effective procedure reduces matrix interferences as well as sample prep variation among technicians.

Foods, Flavors & Fragrances

Comprehensive Pesticide Residue Analysis by LC/MS/MS Using an Ultra Aqueous C18 Column

Analysis of pesticide residues in foods is complicated by the large number of target compounds. LC/MS/MS analysis using an Aqueous C18 column provides more comprehensive results than GC alone.

Foods, Flavors & Fragrances

Simple, Reliable HPLC Analyses of Organic Acids Using Water-Compatible Allure® or Ultra C18 Columns

Commonly used organic acid methods (e.g. AOAC method 986.13) depend on reversed phase HPLC and C18 columns, however these columns are vulnerable to phase collapse when used with the aqueous mobile phases necessary for optimal organic acid analysis. Restek’s Ultra Aqueous C18, Allure® Aqueous C18, and Allure® Organic Acids columns all withstand phase collapse and resolve organic acids in a 100% aqueous mobile phase, compared to a conventional C18 column which shows a complete loss of retention.

Foods, Flavors & Fragrances

Using Thermal Desorption to Enhance Aroma Profiling by GC/MS Lower Detection Limits with Latest Technology

Thermal desorption offers an automatic, high-sensitivity alternative to conventional liquid extraction methods for aroma profiling by GC/MS. It allows vapor profile constituents to be cleanly separated from the sample matrix and often facilitates selective purging of volatile interferences. This ensures that the vapor profile analyzed is most representative of the aroma perceived by consumers and that key compounds can be identified and measured at the lowest levels possible.

General Interest

Dual Vespel® Ring Inlet Seals Washerless, Leak-Tight Seals for Agilent GCs

Restek's Dual Vespel® Ring inlet seal gives you a better seal with fewer parts. Data show that the soft Vespel® material has a much lower leak rate than a metal seal. Also, since less torque is required for installation, user variability is reduced.

Clinical, Forensic & Toxicology

5 Minute Analysis of Vitamin D in Serum by LC/MS/MS

Conventional techniques for vitamin D analysis often lack adequate sensitivity, specificity, and speed. This LC/MS/MS assay results in highly symmetric peaks that elute in just 5 minutes.

PDF Document

Determining Pesticides in Dietary Supplements with QuEChERS Extraction, Cartridge SPE, and GCxGC-TOFMS

The novel approach used here combines QuEChERS extraction, cartridge SPE cleanup, and GCxGC-TOFMS analysis, resulting in good recoveries for a wide range of pesticides in dietary supplements. Matrices include dandelion root, sage, and a multi-herb finished product. (PDF - 394kB)

PDF Document

New Rxi®-PAH GC Column; Resolve Important Isobaric Polycyclic Aromatic Hydrocarbons for Food Safety and Environmental Methods

Separate isobaric polycyclic aromatic hydrocarbons, including priority EFSA PAH4 compounds benz[a]anthracene, chrysene, benzo[b]fluoranthene, and benzo[a]pyrene, easily and accurately on an Rxi®-PAH column. Whether you need more resolution or faster analysis, these new GC columns offer the selectivity and efficiency you need for food safety and environmental PAH analysis. (PDF - 826kB)

PDF Document

Thermal Desorption: A Practical Applications Guide: IV. Food, Flavour, Fragrance & Odour Profiling

Thermal desorption is used extensively for measuring volatile and semivolatile components in foods, flavors, fragrances, and odors. This 28-page publication from Markes International Ltd. presents several key applications. (PDF - 1952kB)

PDF Document

Fast, Simple QuEChERS Extraction and Cleanup of Pesticide Residue Samples

QuEChERS dSPE methods simplify extract cleanup, reduce material costs, and improve sample throughput. Here we demonstrate the effectiveness of QuEChERS sample cleanup using a multiresidue analysis of pesticides on strawberries. (PDF - 158kB)