Welcome to our new website!

QuEChERS Extraction Bags, 4.0g MgSO4 , 50pcs/pk

SKU: 005PM-018-50

QuEChERS Extraction Bags, 4.0g MgSO4 , 50pcs/pk

Welch Materials, Inc.
$40.00 USD
$40.00 USD
Sale Sold out
/
This is a pre order item. We will ship it when it comes in stock.

QuEChERS (pronounced “catchers”) stands for Quick, Easy, Cheap, Effective, Rugged and Safe - the qualities that describe this sample preparation method for food substances. The technique is quite simple, involving a minimum of steps, and is effective for the cleanup of complex samples. QuEChERS is an upgraded version of SPE. They have similar functions, but the preparation method of QuEChERS is much easier. With QuEChERS, you can prepare your samples for multi-class, multi-residue analysis while saving time and money. In the United States, the Association of Official Analytical Chemists (AOAC) has published its 2007 .01 Method while the European equivalent, the EN 15662 2007, uses similar methodology .

Pairs well with

QuEChERS(sounds like "Catchers") is the abbreviation describing its features of quick, easy, cheap, effective, rugged and safe.
This method was first developed by Department of Agriculture M. Anastassisdes et al. (2003) in U.S. Finally, QuEChERS method was formally proposed after multiple verification and improvement.
The QuEChERS method is a residue detection method for multiple target objects in the analysis of pesticide residues in the matrix with high water content (80-95%). It is the fast version of SPE with the similar cleaning effect, but its treatment steps are more concise. QuEChERS method has the characteristics of time saving, high efficiency and economical. There may be a large number of chlorophyll, lipid, steroid and other compounds in sample matrix of food, animal products and so on. These extracts can seriously interfere with the analysis of target substance, while QuEChERS method can effectively reduce these problems. With a few simple steps. it can complete the preparation of pesticide residues and other samples. Nowadays, this method has been widely accepted worldwide, if it is applied to your project, you will find that it can significantly reduce the time required for method development and pretreatment.

Comparative Advantage

Reasons for Choosing Welchrom QuEChERS Products

  • Time saving: Pre-packed products save valuable time for pretreatment, enabling smooth high-throughput analysis.
  • Economical: As the professional chromatographic packing materials manufacturer, we offer preferential price by bulk purchasing of our reagents.
  • Durable: ultra-clean SPE adsorbent and strict quality control to ensure reproducibility of results. Anhydrous magnesium sulfate is treated by muff furnace at high temperature to improve the dehydrating effect and remove contaminants that may be introduced in the self-made process.
  • Customized: We provide customized service according to the needs of users, and professional technical services of our technical team.
  • Humanized packaging: The extraction bag is packaged by coffee bag, and the clean-up tube is packaged by vertical pipe rack, which is very convenient to use.

Development Course of QuEChERS Method

Step 1 --- Extraction

Step 2 --- Clean up
AOAC, EN methods add buffer salts in the original OR method to ensure effective extraction of pH-sensitive compounds, to reduce degradation of sensitive compounds (such as pesticides that are not stable to alkali or acid), and to expand the application range of broad spectrum of this method for food matrices. In the first step of extraction, citrate is used as a buffer to adjust pH to 5-5.5, allowing most pesticides that are not stable to acid or alkali to remain stable. For alkali-sensitive compounds, the stability can be improved by adding a small amount of formic acid after cleanup. For target compounds containing acidic pesticides (phenoxy alcohols), sample injection analysis can be performed directly (skipping the SPE dispersion step), as the acidic group binds to the PSA adsorbent, resulting in reduced recovery rate. For dry samples such as cereals, dried fruits, tobacco, or tea, water should be added before the extraction to reduce the interaction between pesticide and matrices to ensure adequate phase separation. Even high-fat samples such as avocados or olive oil can be analyzed this way. However, for strong nonpolar pesticides, the recovery rate can only reach 70% due to phase separation entered lipid phase. Those lipids extracted together can be removed by freezing or adding a C18E adsorbent.
Nowadays, QuEChERS method has been applied in more and more fields, such as detection of PAHs in meat products, detection of various veterinary drug residues, detection of dicyandiamide, etc. The development of these applications has greatly reduced the pretreatment workload of chromatographers.

Common Questions for QuEChERS Method

Q: How to improve recovery rate of method?
  • Using high-quality homogeneous device can obtain smaller sample particles and improve the precision of the method.
  • Using matrix solution to prepare standard solution can reduce matrix effect and obtain higher accuracy.
  • The addition of isotopic internal standard can effectively monitor the recovery rate.
  • Making the water content of the sample to be tested reach 80% can effectively improve the extraction efficiency.
  • Alkali sensitive pesticides can be added with buffer salt, extraction and extraction bags to prevent loss.
  • According to the thermal stability of pesticides, appropriate analytical means should be adopted. GC or GC/MS can be used for general pesticides, while LC/MS/MS can be used for thermal unstable pesticides.
  • Toluene is added to the final sample solution to prevent thermal instability in the GC liner.
  • Adding 1% formic acid to the final sample solution can reduce the degradation loss of alkali sensitive compounds.

Q: Questions of chromatography

  • Adding acetic acid will affect the cleaning effect of PSA adsorbent and leading peak, tailing peak may occur in GC chromatogram. If this happens, a QuEChERS method without acetic acid can be used instead.
  • For some samples of complex matrices, if the QuEChERS method cannot effectively purify the samples, multiple methods such as SPE-QuEChERS and QuEChERS-GPC can be used.

      Brand: Welchrom

      Barrel Size:

      MgSO4 Weight: 4g

      Na Acetate Weight:

      Na Citrate Weight:

      Na Citrate Sesquihtdrate Weight:

      NaCl Weight:

      PSA Weight:

      C18E Weight:

      GCB Weight:

      Na2SO4 Weight:

      C18 Weight:

      Product Description

      QuEChERS(sounds like "Catchers") is the abbreviation describing its features of quick, easy, cheap, effective, rugged and safe.
      This method was first developed by Department of Agriculture M. Anastassisdes et al. (2003) in U.S. Finally, QuEChERS method was formally proposed after multiple verification and improvement.
      The QuEChERS method is a residue detection method for multiple target objects in the analysis of pesticide residues in the matrix with high water content (80-95%). It is the fast version of SPE with the similar cleaning effect, but its treatment steps are more concise. QuEChERS method has the characteristics of time saving, high efficiency and economical. There may be a large number of chlorophyll, lipid, steroid and other compounds in sample matrix of food, animal products and so on. These extracts can seriously interfere with the analysis of target substance, while QuEChERS method can effectively reduce these problems. With a few simple steps. it can complete the preparation of pesticide residues and other samples. Nowadays, this method has been widely accepted worldwide, if it is applied to your project, you will find that it can significantly reduce the time required for method development and pretreatment.

      Comparative Advantage

      Reasons for Choosing Welchrom QuEChERS Products

      • Time saving: Pre-packed products save valuable time for pretreatment, enabling smooth high-throughput analysis.
      • Economical: As the professional chromatographic packing materials manufacturer, we offer preferential price by bulk purchasing of our reagents.
      • Durable: ultra-clean SPE adsorbent and strict quality control to ensure reproducibility of results. Anhydrous magnesium sulfate is treated by muff furnace at high temperature to improve the dehydrating effect and remove contaminants that may be introduced in the self-made process.
      • Customized: We provide customized service according to the needs of users, and professional technical services of our technical team.
      • Humanized packaging: The extraction bag is packaged by coffee bag, and the clean-up tube is packaged by vertical pipe rack, which is very convenient to use.

      Development Course of QuEChERS Method

      Step 1 --- Extraction

      Step 2 --- Clean up
      AOAC, EN methods add buffer salts in the original OR method to ensure effective extraction of pH-sensitive compounds, to reduce degradation of sensitive compounds (such as pesticides that are not stable to alkali or acid), and to expand the application range of broad spectrum of this method for food matrices. In the first step of extraction, citrate is used as a buffer to adjust pH to 5-5.5, allowing most pesticides that are not stable to acid or alkali to remain stable. For alkali-sensitive compounds, the stability can be improved by adding a small amount of formic acid after cleanup. For target compounds containing acidic pesticides (phenoxy alcohols), sample injection analysis can be performed directly (skipping the SPE dispersion step), as the acidic group binds to the PSA adsorbent, resulting in reduced recovery rate. For dry samples such as cereals, dried fruits, tobacco, or tea, water should be added before the extraction to reduce the interaction between pesticide and matrices to ensure adequate phase separation. Even high-fat samples such as avocados or olive oil can be analyzed this way. However, for strong nonpolar pesticides, the recovery rate can only reach 70% due to phase separation entered lipid phase. Those lipids extracted together can be removed by freezing or adding a C18E adsorbent.
      Nowadays, QuEChERS method has been applied in more and more fields, such as detection of PAHs in meat products, detection of various veterinary drug residues, detection of dicyandiamide, etc. The development of these applications has greatly reduced the pretreatment workload of chromatographers.

      Common Questions for QuEChERS Method

      Q: How to improve recovery rate of method?
      • Using high-quality homogeneous device can obtain smaller sample particles and improve the precision of the method.
      • Using matrix solution to prepare standard solution can reduce matrix effect and obtain higher accuracy.
      • The addition of isotopic internal standard can effectively monitor the recovery rate.
      • Making the water content of the sample to be tested reach 80% can effectively improve the extraction efficiency.
      • Alkali sensitive pesticides can be added with buffer salt, extraction and extraction bags to prevent loss.
      • According to the thermal stability of pesticides, appropriate analytical means should be adopted. GC or GC/MS can be used for general pesticides, while LC/MS/MS can be used for thermal unstable pesticides.
      • Toluene is added to the final sample solution to prevent thermal instability in the GC liner.
      • Adding 1% formic acid to the final sample solution can reduce the degradation loss of alkali sensitive compounds.

      Q: Questions of chromatography

      • Adding acetic acid will affect the cleaning effect of PSA adsorbent and leading peak, tailing peak may occur in GC chromatogram. If this happens, a QuEChERS method without acetic acid can be used instead.
      • For some samples of complex matrices, if the QuEChERS method cannot effectively purify the samples, multiple methods such as SPE-QuEChERS and QuEChERS-GPC can be used.

          Specification

          Brand: Welchrom

          Barrel Size:

          MgSO4 Weight: 4g

          Na Acetate Weight:

          Na Citrate Weight:

          Na Citrate Sesquihtdrate Weight:

          NaCl Weight:

          PSA Weight:

          C18E Weight:

          GCB Weight:

          Na2SO4 Weight:

          C18 Weight:

          Documents
          Reviews