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Related Concept Videos

Sample Preparation for Analysis: Overview01:21

Sample Preparation for Analysis: Overview

Sample preparation is an essential step in the analytical process. It involves preparing a sample so that it can be analyzed accurately. The goal is to extract the analyte, the substance you want to measure, from the sample while removing any components that may interfere with the analysis. Sample preparation techniques vary depending on the physical state of the sample.
Bulk or large solid samples are typically reduced in size using grinding, crushing, or milling techniques to increase the...
Contaminants and Errors01:16

Contaminants and Errors

Effective sample preparation is crucial for accurate and reliable laboratory analysis. During this process, two significant sources of error can arise: concentration bias from improper sample splitting and contamination caused by methods used to reduce particle size, such as grinding or homogenization. Identifying and minimizing these potential errors is crucial to ensuring the validity of the analysis.
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Atomic Absorption Spectroscopy: Lab01:21

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For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
 Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing nebulizer...

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Updated: Jun 25, 2026

Quantification of Fungal Colonization, Sporogenesis, and Production of Mycotoxins Using Kernel Bioassays
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Published on: April 23, 2012

Sampling hazelnuts for aflatoxin: uncertainty associated with sampling, sample preparation, and analysis.

Guner Ozay1, Ferda Seyhan, Aysun Yilmaz

  • 1TUBITAK Marmara Research Center, Food Institute, PO Box 21 41470 Gebze, Kocaeli, Turkey.

Journal of AOAC International
|August 19, 2006
PubMed
Summary
This summary is machine-generated.

Variability in aflatoxin testing for hazelnuts is primarily due to sampling, increasing with contamination levels. Mathematical models predict this variability for accurate risk assessment in bulk shipments.

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Area of Science:

  • Food Science
  • Analytical Chemistry
  • Agricultural Science

Background:

  • Aflatoxins are toxic fungal metabolites posing significant risks to food safety, particularly in commodities like hazelnuts.
  • Accurate estimation of aflatoxin levels in bulk shipments is crucial for regulatory compliance and consumer protection.

Purpose of the Study:

  • To investigate and quantify the sources of variability in the aflatoxin testing procedure for shelled hazelnuts.
  • To develop mathematical models for predicting testing variability based on aflatoxin concentration and testing parameters.

Main Methods:

  • Investigated variability by analyzing 160 samples (16 per lot) from 20 suspected aflatoxin-contaminated hazelnut lots.
  • Partitioned total variance into sampling, sample preparation, and analytical components.
  • Utilized regression analysis to model the relationship between aflatoxin concentration and variance components.

Main Results:

  • Each variance component (sampling, sample preparation, analytical) increased with rising aflatoxin concentration (B1 or total).
  • Developed mathematical expressions to model these relationships, enabling variance estimation for various testing parameters.
  • At 10 ng/g total aflatoxin, sampling variance (174.40) dominated, followed by sample preparation (0.74) and analytical (0.27) variances.

Conclusions:

  • Sampling is the predominant source of variability (99.4%) in aflatoxin testing of hazelnuts, significantly outweighing sample preparation (0.4%) and analytical (0.2%) steps.
  • The developed models provide a tool to optimize testing strategies and manage risks associated with aflatoxin contamination in hazelnut lots.