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Agar as a gelling agent: chemical and physical analysis
1Department of Horticulture, Wageningen Agricultural University, Haagsteeg 3, 6708 PM Wageningen, The Netherlands Fax no.: +31-3 17-48 47 09 E-mail: HARRY.SCHOLTEN@USERS.TBPT.WAU.NL, , , , , , NL.
Plant Cell Reports
|February 10, 2019
Summary
Agar quality significantly impacts bioassay performance, with higher gel strength, lower sulfur, and specific trace element profiles indicating superior results. Chlorine content serves as a reliable indicator of agar purity and quality.
Area of Science:
- Plant Science
- Biotechnology
- Materials Science
Background:
- Agar is a crucial gelling agent in biological assays, but variations in its performance are observed.
- Understanding the physical and chemical properties influencing agar performance is essential for optimizing bioassays.
Purpose of the Study:
- To analyze the physical and chemical properties of agars with varying bioassay performance.
- To identify key characteristics correlating with superior agar performance in biological applications.
Main Methods:
- Physical property analysis (gel strength).
- Chemical analysis (sulfur content, salt content, trace elements, chlorine).
- Bioassay performance evaluation.
- Ion diffusion rate assessment.
- Impact of autoclaving time and pH on agar properties and performance.
Main Results:
- Highest gel strength correlated with best agar performance.
- Good performance linked to low pH and low sulfur content.
- Agar impurities, including trace elements and up to 30% of Murashige and Skoog (MS) salts, were immobilized.
- Chlorine content was a reliable marker for agar quality and purity, visualized with silver nitrate (AgNO3).
Conclusions:
- Agar gel strength, sulfur content, and pH are critical factors determining bioassay performance.
- Immobilization of nutrients and impurities within the agar gel affects medium availability.
- Chlorine content serves as a practical indicator for assessing agar quality and purity.
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