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Sample Handling

Sample Handling

Transportation of samples from the collection point to the laboratory, as well as storage and preservation techniques, are crucial for maintaining sample integrity and ensuring accurate and reliable test results.
Samples should be transported carefully from collection points to the laboratory. They should be properly sealed and clearly labeled to prevent cross-contamination. To preserve the sample integrity, optimal temperature conditions during transport are essential. This could involve using...

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Updated: Jun 10, 2025

In Situ Soil Moisture Sensors in Undisturbed Soils

In Situ Soil Moisture Sensors in Undisturbed Soils

Published on: November 18, 2022

Quality Control: Water Activity Considerations for Beyond-use Dates.

¹International Journal of Pharmaceutical Compounding. lallen@ijpc.com.

International Journal of Pharmaceutical Compounding

|October 15, 2024

Summary

This summary is machine-generated.

Water activity (aw) is crucial for microbial growth, with bacteria needing at least 0.91 and fungi 0.6. Lowering aw by adding solutes like salt or sugar can preserve products and inhibit microbial proliferation.

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Area of Science:

Food Science
Microbiology
Chemistry

Background:

Microbial growth is influenced by the availability of water.
Water activity (aw) quantifies the water available for microbial metabolism.
Different microorganisms have specific minimum aw requirements for growth.

Purpose of the Study:

To explain the concept of water activity.
To define the relationship between water activity and microbial growth.
To outline methods for controlling water activity in food products.

Main Methods:

Definition of water activity as the ratio of water vapor pressure.
Explanation of free vs. bound water.
Identification of minimum aw for bacterial and fungal growth.

Main Results:

Bacteria require aw ≥ 0.91; fungi require aw ≥ 0.6.
Lowering aw by adding solutes (e.g., NaCl, sucrose, alcohol) inhibits microbial growth.
Nonaqueous liquids and dry solids have low aw and do not support microbial growth.

Conclusions:

Water activity is a critical factor in food preservation.
Controlling water activity is an effective strategy to prevent microbial spoilage.
Understanding aw levels is essential for ensuring product safety and shelf-life.