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Featured Application: 19 Cannabinoids on Raptor ARC-18

Suitable for high-throughput cannabis testing labs, this LC-UV method reliably separates 19 cannabinoids in a quick, 10-minute analysis. Using only 3 mL of acetonitrile per run, labs can significantly decrease solvent use and the associated costs by adopting this procedure.

Featured Application: Rxi-17Sil MSによる3-MCPDとグリシジルエステルの分析

AOCS Cd 29c-13を使用した3-MCPDとグリシジルエステルの分析は時間がかかる上、カラム寿命を短くし、メンテナンスコストを増加させる可能性のある強い誘導体化試薬にGC-MSシステムをさらします。ここでは、スプリット注入を用いてメソッドの最適化をおこない、8分の時間短縮と誘導体化試薬によるダメージの低減、そしてPTVまたはスプリット/スプリットレス注入口の使用を可能とする柔軟性を実現しました。

Featured Application: Analysis of Melamine and Related Compounds on Raptor HILIC-Si

The analysis of melamine and related compounds is critical in protecting consumers from adulterated food products. While these highly polar analytes are difficult to retain and accurately quantify on many columns, the Raptor HILIC-Si column and LC-MS/MS method shown here allow quick and complete separations, so melamine and related compounds can be accurately identified and quantified even at residual levels.

Featured Application: Bisphenols on Raptor Biphenyl

The analysis of bisphenolic compounds that are used as alternatives to bisphenol A (BPA) is essential for monitoring exposure to and evaluating the safety of these emerging industrial chemicals. The LC-MS/MS method presented here provides excellent chromatographic peak shape and separation for an extensive list of BPA analogues in a fast, 8-minute analysis.

Featured Application: Raptor ARC-18によるカンナビノイドのプロファイル

カンナビノイドのこのUVを用いたシンプルなイソクラティック分析条件は、16種類のカンナビノイドを完全に分離します。これにより正確な効能試験を可能となり、プロファイルデータを報告できます。すべての化合物は9分という短時間でベースライン分離でき、ハイスループットカンナビ試験を必要とするラボに適しています。

Featured Application:Rxi-65TGによる食用油中のグリセリド(アシルグリセロール)分析

食用油中のグリセリドのより信頼性の高いGC分析は、Rxi-65TGカラムを使用すると得られます。これは、一般的な65タイプのカラムよりも熱安定性が高く、ブリードが少ないためです。

Featured Application: LC Analysis of 4-MEI on Raptor FluoroPhenyl Columns

Raptor FluoroPhenyl columns perform well in both HILIC and reversed phase modes, giving method developers the flexibility to select the mode that performs best for their specific compounds of interest. Here we use a Raptor Fluorophenyl column in HILIC mode for LC analysis of 4-methylimidazole (4-MEI). This approach provides more retention than reversed phase mode and can be applied to determining 4-MEI levels in caramel colorings to monitor formulations and also in foods and beverages to assess potential exposure.

Featured Application:LC-MS/MSによるRaptor C18 を用いたマルチクラス動物用医薬品分析

食用動物への抗生物質の使用は、薬剤耐性菌を増加させる可能性があるため、公衆衛生上および安全上の懸念事項です。動物組織や食品における最大残留濃度(MRL)の規制を満たすためには、様々な抗生物質に対して高感度かつ効率的で信頼性の高い分析法が必要です。Raptor C18は残留抗生物質分析に理想的です。

Featured Application: QuEChERS(抽出とクリーンアップ)を使用して玄米粉から抽出された多成分農薬混合物

残留農薬の多成分一斉分析には、化学的に多様な分析対象の幅広いリストから複雑なマトリックス成分の悪影響にいたるまで、多くの課題があります。ここで紹介する クロマトグラフィー法の最適化では、わずか7.5分で数百の化合物の分析が可能となります。トータルのサイクルタイムでも10分未満となり、高速かつ正確なサンプルのスクリーニングとラボの生産性の向上を保証します。

Featured Application: Raptor BiphenylによるカンナビスCBDオイル中マイコトキシン分析

マイコトキシン分析における煩雑で時間のかかるイムノアフィニティカラムサンプルによる前処理は、簡単なパススルーSPEサンプル精製に置き換えることができます。 Raptor Biphenylカラムを使用したLC-MS / MS分析と組み合わせることで、2 ng / gのアフラトキシンとオクラトキシンの優れたクロマトグラフィー結果が得られ、カンナビス中マイコトキシンのハイスループット分析が可能です。

Featured Application: Raptor Biphenylによるピーナッツパウダー中のマイコトキシン分析

ここで紹介するメソッドは、ピーナッツパウダー中のマイコトキシンの高速分析を可能にします。 FDAとEUで規制されている12のマイコトキシンのベースライン分離が、分析時間5.5分(サイクルタイム7分)で達成できます。このメソッドは、マトリックスマッチ検量線または安定同位体希釈法のいずれかを使用することで、さまざまなマトリックスに適用できます。 サンプルスループットは、分析毎の短いサイクルタイムによって大幅に改善されます。

Featured Application:Raptor FluoroPhenylによるマイコトキシン分析

作物のマイコトキシン汚染は公衆衛生上の懸念だけでなく、世界経済にも大きな影響を及ぼします。わずか9分間で20種類のマイコトキシンを分離できる選択性の高いカラムを使用したLC-MS/MS分析により、毒素を正確に特定し、食品の汚染を監視し、さらに経済的損失を防ぐ管理戦略をサポートできます。

Featured Application: LC‐MS/MSを用いたRaptor Polar Xによるホウレンソウ中の極性農薬

ホウレンソウ中の極性農薬を直接分析するためのこの高速でシンプルなLC-MS / MSワークフローは、Raptor Polar Xカラムにより何百回ものマトリックス注入を経ても良好な保持とピーク形状を実現します。

Featured Application:Raptor ARC-18によるピロリジジンアルカロイドの分析

ピロリジジンアルカロイドの分析には時間がかかります。一般的な分析時間は15分かかる上、酸分解過程があるため分析カラムの寿命が短くなる可能性があります。これに対し、耐酸性のRaptor ARC-18カラムを使用したこの分析では、わずか3.2分で一番遅い化合物が溶出し、良好なピーク形状と分離も得られます。
PDF Document

Accurate, Reliable GC Analysis of Triglycerides in Edible Oils Fight Food Fraud with Rxi-65TG Columns

Restek’s new Rxi-65TG column offers best-in-class thermal stability up to 370 ˚C, making it the top choice for the analysis of triglycerides in edible oils. With the lowest bleed on the market for 65-type columns, Rxi-65TG columns consistently produce quality separations with less interference from bleed and fewer column changes. (PDF - 3195kB)

Analysis of Nicotine and Impurities in Electronic Cigarette Solutions and Vapor

Despite the growing popularity of electronic cigarettes, relatively little work has been done to characterize their vapor. In this study, we developed a quick, simple thermal desorption device for sampling vapor, as well as methods for analyzing vapor and solutions to determine nicotine content (GC-FID) and impurity profiles (GC-MS). This novel approach, which utilizes an Rtx-VMS column, provides detectable levels of volatile organic compounds (VOCs) and semivolatile organic compounds (SVOCs) from a single 40 mL puff.

Analysis of Pesticides and Mycotoxins in Cannabis Brownies

Government regulations in California require the cannabis industry to test edible products for an extensive list of pesticides and mycotoxins. Here, an effective workflow for this complex analysis was developed in brownies, and optimization strategies are detailed in order to provide a starting point for similar matrices. Both LC-MS/MS and GC-MS/MS were employed and excellent results for LOQ, linearity, accuracy, and precision were attained for all the target compounds.

QuEChERS法とSPEによる前処理を用いた GC-TOFMS および GC-MS/MSによるマテ茶中の多環芳香族炭化水素(PAHs)の分析

迅速かつ正確なマテ茶中のPAH分析手法について検討しました。試料前処理には、QuEChERS法を改良し、固相抽出による精製をおこないました。GC-TOFおよびGC-MS/MSの両方を使用し、現実的な分析時間の維持と同重体の分離を最適化した分析をおこないました。

異なるマイコトキシンの安定同位体を 内部標準に用いた同位体希釈分析法は可能か?

安定同位体希釈分析法(SIDA)は、マトリックス効果を相殺して定量をおこなう技術です。ただし、適切な内部標準の選択が必要とされます。ここでは、SIDAを用いたマイコトキシン分析において、ターゲット化合物と同じラベル化内部標準を使用することの重要性について説明します。

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.

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

We compared the efficacy of dSPE and cSPE cleanup methods for multiresidue pesticide analysis of QuEChERS extracts of finished tobacco products using GCxGC-TOFMS. Cleanup with dSPE tubes containing 7.5 mg of GCB and 25 mg of PSA produced better results than other methods, with average recoveries of 92% and 91% for 500 ppb and 50 ppb fortifications respectively.

Fast, Simple Sample Cleanup

Quick, Easy, Cheap, Effective, Rugged, and Safe, the QuEChERS ("catchers") method for extracting pesticides from food is based on USDA research and employs a novel dispersive solid phase extraction cleanup (dSPE). QuEChERS methods are convenient, rugged methods that 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.

GC/MS Analysis of Melamine and Cyanuric Acid Below
1 μg/g in Infant Formula

The establishment of a 1 µg/g safety threshold for melamine in infant foods has led to a need for sensitive methods. Here we established GC/MS conditions for highly reproducible analyses and evaluated the effectiveness of both solvent-based and matrix-matched standards. Using this method, melamine and cyanuric acid were reliably detected at and below 1 µg/g in infant formula.

Growing Analytical Solutions For Cannabis Testing

Restek has been helping cannabis labs establish innovative, cost-effective analytical solutions from the very beginning. We have the GC and LC products and expertise you need today for analyzing potency, terpenes, residual solvents, and pesticide residues. And we are developing the products you’ll need tomorrow for emerging cannabis applications in this fast-growing industry.

High Sensitivity Melamine GC/MS Analysis of Cat Food

Melamine contamination was implicated in a large pet food recall that occurred in 2007 when animals died after eating contaminated pet food. Here, a modified GC/MS method, based on an FDA method, was used to analyze for melamine & related compounds cyanuric acid, ammelide, and ammeline in dry cat food. Analytes were easily identified by retention time matching and mass spectra.

High-Quality Analysis of Pesticides in Cannabis Using QuEChERS, Cartridge SPE Cleanup, and GCxGC-TOFMS

As medical marijuana is more frequently prescribed, patient safety must be ensured. Pesticide residue testing is an important part of assuring safe product is dispensed, but analysis can be extremely challenging due to matrix complexity. The use of QuEChERS, cartridge SPE cleanup, and GCxGC-TOFMS as presented here, produces high-quality quantitative data for this difficult analysis.

脂肪酸メチルエステル (FAMEs)の高分離GC分析

キャピラリーGCは、食品中の総脂質含有量、トランス脂肪酸含有量および総オメガ-3多価不飽和脂肪酸含有量の測定にとても便利です。キャピラリーカラムの選択は、どのような情報を必要とするかによって異なります。ここで紹介しているように、必要とする脂肪酸分析がどのようなものであれ、Restekは正確な測定のサポートする安定した性能の分析カラムと混合標準物質を提供いたします。

Highly Reproducible Detailed cis/trans FAMEs Analysis Ensured by New Optimized Rt-2560 Column Manufacturing and Application-Specific QC Test

Even minor variations in manufacturing processes can potentially have detrimental effects on column-to-column reproducibility. As shown here, Rt-2560 GC columns produced using a newly updated and optimized manufacturing process exhibit high reproducibility and provide consistent performance for detailed cis/trans FAMEs analysis.
PDF Document

HPLC Analysis of Glucosinolates in Vegetable Extracts without Ion Pairing Using an Ultra Aqueous C18 Column

Glucosinolates with hydrophilic functional groups are very difficult to retain by conventional reversed phase HPLC, and when the functional groups in a sample are diverse, polarity can differ widely, complicating the problem. Until now, reversed phase HPLC with an ion pairing reagent has been the inconvenient, but necessary, approach to these analyses. This 2-page note describes a column and conditions for analyses of glucosinolates, without ion pairing. (PDF - 0kB)

耐久性に優れたLCカラムと 費用対効果の高い内部標準による アクリルアミド分析の改善

メソッドEN 16618.2015によるアクリルアミド分析に通常使用される多孔質グラファイトカーボン(PGC)カラムは、アクリルアミドの適切な保持とマトリックス成分からの十分な分離をもたらしますが、カラムの寿命が短く、煩雑なサンプル前処理が必要になります。 ここでは、Allure Acrylamide LCカラムと重水素化内部標準を使用して、トータル分析時間を短縮し、システムの適合性要件をより長く満たすことで、ラボのサンプルのスループットを大幅に向上させるアプローチを紹介します。

Malachite Green and Leucomalachite Green Analysis

Illegal use of malachite green (MG), an inexpensive fungicide, can allow MG to enter water cycles, where it is easily absorbed by fish tissue, and thus enters the human food supply. Reversed phase HPLC often is used to analyze for MG and its stored metabolite, leucomalachite green. Methods that facilitate detection of both compounds are discussed.
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 - 0kB)

Optimizing GC-MS and GC-MS/MS Analysis of 3-MCPD and Glycidyl Esters in Edible Oils

In this work, we developed an improved, indirect GC-MS method for the analysis of 3-MCPD and glycidyl esters by evaluating different inlets (PTV and split/splitless) and injection modes (split vs. splitless).

Quantitative LC-UV Method for CBD in Topicals with Simplified Extraction of Lotions, Balms, and Creams

This LC-UV method for CBD in topicals uses a single sample extraction procedure for lotions, balms, and creams paired with a simple isocratic analysis to produce a fast, efficient workflow for high-throughput labs.

Rapid Characterization of Garlic Volatiles—No Sample Prep Required!

Chromatographic methods for garlic and garlic powder are used by the food and dietary supplement industries to monitor product quality. Here we present a headspace gas chromatography mass spectrometry (HS GC/MS) method for garlic flavor and odor components using an Rxi-5ms column. This method eliminates sample preparation making the bench work simple and fast. The experimental set-up is ideal for both screening analysis and low-level trace analysis.

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

Dietary supplements, which are consumed worldwide, are made from various botanical ingredients. To be safe from pesticides exposure, residual pesticides must be monitored by chromatographic instrumentation. Issues arise, however, due to the fact these botanical samples are dried and cause large interferences in the chromatography. This study shows that the modified QuEChERS method combined with GC-MS/MS achieves consistent pesticides monitoring in botanical ingredients.

Robust 9-Minute GC Analysis of Cholesterol

Conditions are established for analyzing both derivatized and underivatized cholesterol on a highly inert Rxi-5ms column. Methods described include both an isothermal analysis for use when interferences are minimal, but sample throughput is critical, and a temperature program for use when separation of analytes from contaminants or interfering compounds is the primary concern. Results for both derivatized and underivatized samples were highly reproducible.

Rt-2560による牛乳中脂肪酸の頑健な分析:
ユーザーによるカラムの耐久性評価

乳脂肪中の脂肪酸の分析は重要なテストです。Eurofins Analytik GmbHはこの難しいマトリクスを使用してRt-2560カラムの安定性を評価しました。 225回の注入後も一貫した保持時間と分離が達成され、カラムの頑健性が実証されました。

Rt-2560 Columns Ensure Accurate, Reliable AOAC 996.06 and AOCS Ce 1j-07 FAMEs Analysis

Restek has optimized the manufacturing process and implemented a new, application-specific QC testing procedure for all new Rt-2560 columns (cat.# 13198). Here we demonstrate that, Rt-2560 columns produced using the optimized process exhibit excellent performance for both AOAC 996.06 and AOCS Ce 1j-07 FAMEs analysis and meet all method requirements.
PDF Document

Stabilwax-MS Columns—Thermally Stable, High Polarity GC Columns for Flavor, Food, Fragrance, Industrial Chemical, and Solvent Analyses

Low-bleed Stabilwax-MS columns produce excellent results for the analysis of trace levels of polar compounds by GC-MS. These columns are ideal for a wide range of polar analytes including FAMEs, flavor compounds, essential oils, solvents, aromatics, acrolein/acrylonitrile, and oxygenated compounds. (PDF - 0kB)
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 - 0kB)

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