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Quantification of Fungal Colonization, Sporogenesis, and Production of Mycotoxins Using Kernel Bioassays
Published on: April 23, 2012
MYCOLOGICAL ANALYSIS AND AFLATOXIN B1 CONTAMINANT ESTIMATION OF HERBAL DRUG RAW MATERIALS
Puttaswamy Rajeshwari1, KoteshwarAnandrao Raveesha1
1Centre for Innovative Studies in Herbal Drug Technology, Department of Studies in Botany, University of Mysore, Mysuru-570006 India.
Background:
The present study explores the fungal contamination of important herbal drug raw materials (HDRM), which are widely used in the preparation of many herbal drugs. Understanding of the microbial contamination status of HDRM is one of the important steps to ensure the safety and efficacy of herbal drugs.
Materials And Methods:
Eighteen samples of six herbal drug raw materials (HDRM) viz., Acorus calamus Linn., Cassia angustifolia Vahl., Centella asiatica (Linn.) Urban, Myristica fragrans Houtt., Tinospora cardifolia (Wild) Miers and Withania somnifera (Linn.) Dunal, were screened for fungal contamination, by employing serial dilution method. All the isolates of Aspergillus flavus were screened for their ability to produce aflatoxin B1 (AB1) and highly contaminated samples were subjected to AB1 estimation by using Thin Layer Chromatography (TLC), spectrophotometric method and occurrence of Aflatoxin B1 was confirmed by Liquid Chromatography-Mass Spectrometry analysis (LCMS).
Results:
A total of 302 isolates of 42 fungal species belonging to 17 genera were found in association with test the samples. More than 61% of A. flavus isolates tested positive for production of AB1 and highest yield recorded was 5008.20 ppb from the isolates of T. cordifolia. Amongthesix highly contaminated samples three samples tested positive for AB1. Highest AB1 was recorded from T. cordifolia (104.19 μg/kg), followed by A. calamus (13.73 μg/kg) and M. fragrans (12.02 μg/kg).
Conclusion:
Assessment of fungal and mycotoxin contamination should be a part of the quality check while selecting HDRM for manufacture of herbal products. Safe processing and storage practices are necessary.
Insights
Fungal contamination is prevalent in herbal drug raw materials (HDRM). Aspergillus flavus produces aflatoxin B1 in over 61% of isolates, necessitating quality control for herbal product safety.
Area of Science:
- Microbiology
- Mycology
- Pharmacognosy
Background:
- Herbal drug raw materials (HDRM) are widely used in traditional medicine.
- Understanding microbial contamination is crucial for ensuring the safety and efficacy of herbal drugs.
- Fungal contamination poses a significant risk to the quality of HDRM.
Purpose of the Study:
- To investigate fungal contamination in six key herbal drug raw materials (HDRM).
- To screen for the presence of Aspergillus flavus and its production of aflatoxin B1 (AB1).
- To quantify AB1 levels in contaminated HDRM samples.
Main Methods:
- Screening of 18 HDRM samples for fungal contamination using serial dilution.
- Isolation and identification of fungal species, including Aspergillus flavus.
- Detection and quantification of aflatoxin B1 (AB1) using Thin Layer Chromatography (TLC), spectrophotometry, and Liquid Chromatography-Mass Spectrometry (LCMS).
Main Results:
- A total of 302 fungal isolates from 42 species and 17 genera were identified.
- Over 61% of Aspergillus flavus isolates produced aflatoxin B1 (AB1), with the highest yield from Tinospora cardifolia.
- Three of the six highly contaminated samples tested positive for AB1, with Tinospora cardifolia showing the highest concentration.
Conclusions:
- Fungal and mycotoxin contamination assessment is vital for HDRM quality control.
- Implementing safe processing and storage practices is essential to mitigate risks.
- Ensuring the safety of herbal products requires rigorous quality checks of raw materials.
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