استخراج الحمض النووي بطريقة الخرزة المغناطيسية: دقيقة وفعالة “صائد الجينات”

في مجال البيولوجيا الجزيئية والتشخيص الطبي, يعد استخراج الحمض النووي الخطوة الأولى في فك الشفرة الوراثية. From the detection of novel coronavirus nucleic acid to cancer gene analysis, the purity and yield of nucleic acid directly affect the accuracy of the results. في السنوات الأخيرة, the magnetic bead nucleic acid extraction technology, with its efficient, flexible and automatic characteristics, has gradually replaced the traditional phenol chlorine method and centrifugal column method, and become the “star tool” of the laboratory.

1. Principles and procedure of nucleic acid extraction by magnetic bead method

The core of the magnetic bead method is the use of surface-modified magnetic nanoparticles (عن 50-500 nm in diameter) to bind to nucleic acids by electrostatic adsorption, hydrophobic interaction, or specific ligands (such as silicon hydroxyl and carboxyl groups). Its operation process includes the following steps:

Sample lysis: The lysate destroys the cell membrane / viral capsid and releases the nucleic acid;

Magnetic bead binding: magnetic beads specifically bind with nucleic acids to form a “nucleic acid-magnetic bead complex”;

الفصل المغناطيسي: an external magnetic field to adsorb magnetic beads, discard the impurity liquid;

غسل: buffer to remove proteins, polysaccharides and other contaminants;

شطف: The low-salt solution separates the nucleic acid from the magnetic beads to obtain a high-purity nucleic acid.

This process does not require centrifugal column or organic solvent, only magnetic frame, تبسيط خطوات العملية إلى حد كبير.

2. Comparison of the magnetic bead method with the conventional method

أ. Traditional phenol-chlorine method: tedious and dangerous

مبدأ: Nucleic acid is extracted by organic solvents such as phenol and chloroform, and separated by centrifugation;

العيوب: complex steps (need multiple centrifugation), the use of toxic reagents (harm to health), low recovery rate (easy to cause nucleic acid fracture or loss), and difficult to automate.

ب. Centrifugal column method: a compromise choice

مبدأ: Nucleic acid combined with silica gel membrane centrifuge column, purified by centrifugal force;

المزايا: درجة نقاء عالية, suitable for conventional samples;

العيوب: relying on centrifuge, cumbersome steps (multiple liquid transfer), the effect is unstable, and the cost of centrifugal column consumables is high.

ج. طريقة الخرزة المغناطيسية: a comprehensively upgraded technology

كفاءة: high degree of automation, can process hundreds of samples at the same time, time-consuming shortened by more than 30%;

حساسية: the recovery of trace samples (such as plasma free DNA) يكون 20% -30% higher than the centrifugal column method;

Adaptability: can handle complex samples (such as feces, تربة, FFPE tissue), with strong anti-interference ability;

Environmental protection and safety: reduce the use of organic solvents and reduce the pollution risk.

3. Core advantages of the magnetic bead method

High throughput and automation: adaptive automatic nucleic acid extraction instrument, suitable for large-scale screening (such as COVID-19 detection);

High purity and high yield: the magnetic bead surface functional group selective adsorption of nucleic acid, the impurity residue rate is lower than the traditional method;

Flexible customization: magnetic beads can modify different functional groups, adapt to DNA, RNA or specific fragment extraction requirements;

Quick response: فقط 30 minutes from sample to result, helping with emergency scenarios such as the epidemic.

4. Application scenarios and future prospects

التشخيص الطبي: the core steps of COVID-19, HPV and tumor marker detection;

Scientific research fields: تسلسل الخلية الواحدة, environmental microbiome analysis;

Food safety: to detect pathogenic bacteria or genetically modified ingredients in food.

في المستقبل, the magnetic bead method will further develop towards miniaturization (such as microfluidic chip integration) and intelligence (AI control process), and promote the popularization of precision medicine and point-in-time detection(نقطة الرعاية).

5. Notes and common misunderstandings

Myth 1: The more magnetic beads, the better? Excessive magnetic beads will adsorb impurities, but reduce the purity;

Myth 2: The more washing, the better? Excessive washing may lead to nucleic acid loss;

Key point: the appropriate magnetic bead and reagent system should be selected according to the sample type to avoid blind replacement.

مزود

شركة شنغهاي لينغجون للتكنولوجيا الحيوية, المحدودة.تأسست في 2016 وهي شركة متخصصة في تصنيع المواد المغناطيسية الحيوية وكواشف استخلاص الحمض النووي.

لدينا خبرة غنية في استخراج وتنقية الحمض النووي, تنقية البروتين, فصل الخلايا, التألق الكيميائي, وغيرها من المجالات التقنية.

منتجاتنا تستخدم على نطاق واسع في العديد من المجالات, مثل الفحوصات الطبية, الاختبارات الجينية, البحوث الجامعية, التكاثر الوراثي, وهكذا. نحن لا نقدم المنتجات فحسب، بل يمكننا أيضًا إجراء تصنيع المعدات الأصلية, أوديإم, وغيرها من الاحتياجات. إذا كان لديك حاجة ذات صلة, لا تتردد في الاتصال بنا .