Rapid molecular identification of saffron (Crocus sativus L.) based on specific PCR / 中国药学杂志

ABSTRACT

OBJECTIVE: To establish a rapid molecular method for identifying saffron (Crocus sativus L.) and its adulterants by PCR: amplification using specific primers and fluorescent dyes detection. METHODS: The chloroplast barcode was sequenced and analyzed to find the SNPs between saffron and its adulterants. Specific primers were designed for the SNPs, the PCR reaction systems were built and optimized, and fluorescent dyes method was used to identify PCR products. RESULTS: A 421 bp saffron identification band based on the psbA-trnH barcode sequence was screened when 100 × SYBR Green I was added into the optimized PCR product under the following condition; initial denaturation at 90℃ for 1 min, denaturation at 90℃ for 5 s, annealing at 58℃ for 5 s, 26 cycles; the saffron (Crocus sativus L.) showed strong green fluorescence under 365 nm UV lamp whereas adulterants did not. CONCLUSION: Fast site-specific PCR can rapidly identify saffron and its adulteration.