Identification of Ophiocordyceps sinensis and its adulterants based on portable and CFX96 real-time fluorescent PCR systems
10.16438/j.0513-4870.2019-0078
- VernacularTitle:基于便携式和CFX96实时荧光PCR仪的冬虫夏草及其混伪品鉴定研究
- Author:
Kai-yi YUN
1
,
2
;
Li XIANG
3
;
Xiao-yue WANG
1
,
2
;
Yang LIU
1
,
2
;
Hui YAO
1
,
2
;
Jing-yuan SONG
1
,
2
Author Information
1. Key Lab of Chinese Medicine Resources Conservation, State Administration of Traditional Chinese Medicine of the People's Republic of China, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100193, China
2. Engineering Research Center of Chinese Medicine Resources, Ministry of Education, Beijing 100193, China
3. Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China
- Publication Type:Research Article
- Keywords:
italic>Ophiocordyceps sinensis;
TaqMan probe;
real-time fluorescent PCR;
molecular identification
- From:
Acta Pharmaceutica Sinica
2019;54(4):746-752
- CountryChina
- Language:Chinese
-
Abstract:
The molecular identification of Ophiocordyceps sinensis and its adulterants was carried out by real-time fluorescent PCR with TaqMan probe. Genomic DNA was extracted from 100 samples of Ophiocordyceps sinensis and its adulterants. MEGA 7.0 software was used for comparative analysis to define the variable sites between Ophiocordyceps sinensis and its adulterants according to the internal transcribed spacer (ITS) region of ribosomal DNA (rDNA). A set of specific primers and TaqMan probe were designed using Primer Premier 6.0 software, and sensitivity and specificity studies were performed on two different real-time fluorescent PCR systems (Genesig q16 and Bio-Rad CFX96). The sensitivity study showed that the detectable DNA template concentration of Ophiocordyceps sinensis for the real-time fluorescent PCR was 0.016 ng·μL-1 in the Bio-Rad CFX96 system and 15.527 ng·μL-1 in the Genesig q16 system, respectively. Meanwhile, this method had good specificity for Ophiocordyceps sinensis on Genesig q16 and Bio-Rad CFX96 systems, so Ophiocordyceps sinensis could be clearly distinguished from Ophiocordyceps nutans, Cordyceps gunnii, Cordyceps militaris, Cordyceps cicadae, Cordyceps liangshanensis, Cordyceps gracilis. Our results indicate that real-time fluorescent PCR with TaqMan probe can be used to accurately identify Ophiocordyceps sinensis from its adulterants. This provides a technical method that has wide applications for market management and quality control of Chinese materia medica.
