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Rapid, specific, and sensitive detection of spoilage molds in orange juice using a real-time Taqman PCR assay
Kai Wan1, Ahmed E Yousef, Steve J Schwartz
1Department of Food Science and Technology, Ohio State University, Columbus 43210, USA.
Abstract:
The outgrowth of spoilage organisms, including molds and yeasts, results in significant financial loss to the food industry and wastes natural resources. The objective of this study was to develop a rapid, specific, and sensitive real-time PCR method for detecting spoilage molds during screening of raw materials and final product quality control analysis. The 18S rRNA gene was used to develop PCR primers and probe. With this set of primers and probe, less than 1,000 mold cells per milliliter of orange juice (10 cells per reaction) were detected with the real-time PCR system within 6 to 7 h. No cross-reactivity was found with other common foodborne bacteria, yeasts, or food ingredients. This technique is significantly faster than current detection and identification procedures, which take from days to weeks.
Insights
A new real-time PCR method rapidly detects spoilage molds in food. This advanced technique offers a faster, more specific alternative for quality control, reducing industry losses.
Area of Science:
- Food Microbiology
- Molecular Biology
- Analytical Chemistry
Background:
- Spoilage organisms like molds and yeasts cause significant financial losses and resource waste in the food industry.
- Current methods for detecting spoilage molds are time-consuming, taking days to weeks for identification.
Purpose of the Study:
- To develop a rapid, specific, and sensitive real-time PCR method for detecting spoilage molds.
- To enable efficient screening of raw materials and final product quality control.
Main Methods:
- Utilized the 18S rRNA gene to design specific PCR primers and a probe.
- Employed a real-time PCR system for sensitive mold detection.
Main Results:
- Detected less than 1,000 mold cells/mL in orange juice (10 cells/reaction) within 6-7 hours.
- Demonstrated no cross-reactivity with common foodborne bacteria, yeasts, or food ingredients.
Conclusions:
- The developed real-time PCR method is significantly faster than traditional techniques.
- This method provides a rapid, specific, and sensitive tool for spoilage mold detection in food quality control.
