Citrus Juice DNA Isolation via Solid-Liquid Segmentation
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Solution Overview
Problem
Current methods for isolating DNA from citrus juices are inefficient due to high concentrations of interfering compounds like pectin and secondary metabolites, which hinder the extraction of high-quality and quantity DNA, especially from orange juice, making it difficult to detect microorganisms like Candidatus Liberibacter asiaticus (CLas) effectively.
Innovation Solution
A method involving the separation of solid and liquid components, followed by cell lysis and the use of CTAB and salt to precipitate nucleic acids while keeping polysaccharides dissolved, combined with a series of washing steps to obtain purified DNA, and subsequent PCR to quantify microorganism DNA for quality and safety assessment of juices and ciders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional DNA isolation methods (SDS-KoAC or CTAB) are used on citrus juice, then DNA can be extracted, but the high concentration of interfering compounds (pectin, secondary metabolites) results in low-quality and low-quantity DNA
Solution Approach 1:
The method separates solid components (containing microorganisms) from liquid components (containing interfering compounds like pectin and sugars) before DNA extraction. This segmentation removes the source of interference while concentrating the target DNA in the solid fraction, resolving the contradiction between DNA quality and quantity by eliminating competing substances that would otherwise co-extract and reduce purity
Solution Approach 2:
The method extracts and removes interfering compounds (pectin, secondary metabolites, sugars) from the juice matrix before performing DNA isolation. By taking out these harmful factors that interfere with DNA extraction and quality, the method enables获得高纯度DNA without the quantity loss that would result from multiple purification steps
2Measurement precision
If additional lysis steps (mechanical disruption, sonication, enzymatic digestion) and purification steps (elution column) are used to overcome interfering compounds, then DNA quality improves, but the process complexity and time increase
Solution Approach 1:
The method performs preliminary separation of solid and liquid components before DNA extraction begins. This preliminary action removes interfering compounds upfront, eliminating the need for complex subsequent purification steps like elution columns or multiple extraction rounds, thereby simplifying the overall process while maintaining high DNA quality
Solution Approach 2:
By extracting and removing interfering compounds (pectin, secondary metabolites) in the preliminary separation step, the method eliminates the need for additional purification devices and complex procedures, reducing process complexity while ensuring high DNA quality for downstream applications
3Measurement precision
If traditional DNA isolation methods are used on citrus juice, then DNA extraction can proceed, but the presence of pectin and secondary metabolites results in co-purification and low DNA purity
Solution Approach 1:
The method segments the juice into solid components (containing microorganisms and DNA) and liquid components (containing pectin and secondary metabolites). This physical segmentation prevents co-purification of interfering compounds with DNA, thereby improving DNA purity and ensuring reliable microorganism detection without false positives or inhibition from contaminants
Solution Approach 2:
The method extracts and removes interfering compounds (pectin, secondary metabolites) from the system before DNA isolation. By taking out these harmful factors that would otherwise co-purify with DNA, the method achieves high DNA purity and ensures reliable microorganism detection for quality and safety assessment
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
This method enables the isolation of high-quality DNA from citrus juices, allowing for accurate detection of microorganisms, thereby assessing the quality and safety of juices and ciders, even with low microorganism concentrations, and is applicable to various fruit and vegetable juices.
Implementation Method 1
the use of CTAB and salt to precipitate nucleic acids while keeping polysaccharides dissolved
Implementation Method 2
separating the proteins, lipids, and non-polar material from the nucleic acids and polysaccharides
Implementation Method 3
separating the solid components present in a sample of the liquid from the liquid soluble components
Data Source
AI summary
A novel method for isolating DNA from juices and ciders is described. This method is low cost and yield large quantities of highly purified DNA even though one uses a small quantity of juice or cider. A method for determining if a juice or cider is safe to consume and/or the quality of the juice or cider are also described. For these methods, one can perform qPCR on the DNA which can be obtained using the disclosed method or any other prior art method, and comparing the amount of DNA from microorganisms is present in the juice and/or cider to determine the safety and/or quality of the juice and/or cider. These methods work even if the liquid was pasteurized.