Extraction of light filth from unground marjoram: collaborative study.

Area of Science:

• Food science
• Analytical chemistry
• Agricultural science

Background:

• Current methods for analyzing filth in underground marjoram are laborious and have low recovery rates.
• The existing two-part method for heavy and light filth analysis is sequential, increasing overall processing time.
• Microscopic examination, a critical part of the current method, is time-consuming.

Purpose of the Study:

• To develop an improved method for filth analysis in unground marjoram.
• To enhance the recovery rates of insect fragments and rodent hairs.
• To reduce the time required for microscopic examination in filth analysis.

Main Methods:

• The proposed method involves ethanol defatting followed by a 15-60% ethanol/mineral oil extraction in a Wildman trap flask.
• Tween 80-NaEDTA solution is utilized in the trapping system to minimize the flotation of excess plant material.
• This new approach decouples light filth analysis from the heavy filth determination.

Main Results:

• The proposed method achieved average recoveries of 73% for rodent hairs and 70% for insect fragments.
• This represents a substantial improvement compared to the official method's recoveries of 14% for rodent hairs and 26% for insect fragments.
• Microscopic examination time was reduced compared to the official method (AOAC 13th edition secs 44.142, 44.120(b)).

Conclusions:

• The developed method offers significantly higher recoveries for key filth elements in marjoram.
• The new technique streamlines the analysis process, reducing time and improving efficiency.
• This improved method has been officially adopted for the analysis of filth in unground marjoram.