Scented Rice Detection Primer Set Using Fluorescence PCR
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Solution Overview
Problem
The existing methods for identifying scented rice, such as the chewing method and KOH method, lack accuracy in distinguishing between naturally scented rice and artificially flavored rice, and fail to provide a reliable quantitative detection, leading to potential adulteration and fraud in the market.
Innovation Solution
A qualitative and quantitative detection primer set is developed, including specific primers targeting the fgr gene, which uses fluorescence quantitative PCR to accurately identify scented rice by amplifying DNA sequences associated with the 2-AP production, enabling precise detection of scented rice varieties like Daohuaxiang and Thai Jasmine rice.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional chewing method or KOH method is used for scented rice identification, then the detection process is simple and quick, but the measurement precision and reliability are poor due to reliance on sensory evaluation
Solution Approach 1:
The patent replaces the mechanical/sensory evaluation system (chewing method, KOH method) with a molecular biological detection system (fluorescence quantitative PCR). This substitution eliminates reliance on human sensory evaluation and replaces it with objective DNA-level detection, thereby dramatically improving measurement precision while maintaining operational feasibility through standardized laboratory procedures
Solution Approach 2:
The patent introduces DNA as an intermediary substance to detect scented rice characteristics. Instead of directly evaluating aromatic properties through sensory methods, the detection is mediated through DNA extraction, PCR amplification of specific genes (fgr, BADH2, 2-AP synthase), and fluorescence quantification. This intermediary approach enables precise, objective, and quantifiable detection of scented rice authenticity
2Measurement precision
If fluorescence quantitative PCR gene technology is used for scented rice detection, then the measurement precision and reliability are significantly improved, but the device complexity and detection time increase
Solution Approach 1:
The patent segments the detection process into distinct, modular stages: DNA extraction, PCR amplification with specific primers, and fluorescence quantification. Each stage uses targeted primers for specific genes (fgr, BADH2, 2-AP synthase), allowing the complex detection to be broken down into manageable steps that can be performed with standardized protocols and equipment
Solution Approach 2:
The patent utilizes parameter changes in the form of fluorescence signal intensity to detect and quantify scented rice. By monitoring the fluorescence parameters during PCR amplification, the system can precisely determine the presence and concentration of scented rice DNA, transforming a complex biological detection into a measurable physical parameter that can be accurately quantified
3Reliability
If fluorescence quantitative PCR is used for quantitative detection of scented rice, then the reliability and accuracy are improved, but the loss of time increases compared to traditional rapid methods
Solution Approach 1:
The patent employs preliminary action by designing and optimizing specific primers in advance for the key genes associated with scented rice characteristics (fgr, BADH2, 2-AP synthase). These pre-designed primers are ready for immediate use in PCR amplification, eliminating the need for time-consuming primer design and optimization during actual detection, thereby reducing overall detection time while maintaining high reliability
Solution Approach 2:
The patent implements continuous useful action through the fluorescence quantitative PCR process, where amplification and detection occur simultaneously in real-time. The fluorescence signal is continuously monitored during each PCR cycle, allowing quantitative analysis to be performed without interrupting the amplification process. This continuous detection approach maximizes efficiency by eliminating separate detection steps and reducing total analysis time
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The primer set achieves accurate qualitative and quantitative detection of scented rice, reducing adulteration identification errors to within 10% deviation and significantly reducing reaction costs, with the entire process completed within 2 hours, compared to traditional methods.
Implementation Method 1
the identification of scented rice at the gene level could be realized by using fluorescence quantitative polymerase chain reaction (PCR) gene technology
Data Source
AI summary
A qualitative and quantitative detection primer set, a kit and a detection method for scented rice are provided. The scented rice and non-scented rice are qualitatively analyzed by fluorescence quantitative polymerase chain reaction (PCR), and the scented rice with different adulteration ratios is calculated by a 2-ΔΔCT method, so that the scented rice and the non-scented rice of different varieties can be accurately identified. Primers are designed for specific fragments of the scented rice and the non-scented rice respectively based on the principle of amplification-refractory mutation system (ARMS)-PCR, and qualitative identification of the scented rice can be achieved by agarose gel electrophoresis or fluorescence quantitative PCR according to different laboratory conditions. Combined with internal reference primers for the calculation of gene level by fluorescence quantitative PCR method of scented rice and/or non-scented rice can achieve the adulteration detection of the scented rice quantitatively.