Como melhorar os resultados do 260/230 cálculo usando o método de esfera magnética para extração de reagentes？

Ao extrair ácidos nucleicos usando o método de esfera magnética, um baixo 260/230 razão (geralmente < 1.8) indica a presença de compostos orgânicos(como sais de guanidina, fenol, etanol, EDTA) or residual salts in the sample, which can affect downstream experiments (como PCR, sequenciamento).

 Here is a systematic optimization plan:

1. Optimization of Extraction Steps

um. Complete sample lysis

Problem: Incomplete lysis leads to incomplete release of impurities.

Improvement: Increase the lysis time (por exemplo, extend to 30 minutos) or temperature (56℃).

Add a grinding step or additional proteinase K digestion for complex samples (such as plants, fezes).

b. Thoroughly wash the magnetic beads

Key step: Incomplete washing is the main cause of 260/230 baixo.

Improvement: Increase the number of washes: 2 times → 3 vezes (especially for samples with high impurities).

Washing solution formula: Ensure to use freshly prepared 80% etanol (avoid excessive water content or contamination).

Washing operation: Vortex or shake to mix the magnetic beads each time, avoiding the formation of beads clumps.

Thoroughly aspirate the supernatant (can briefly centrifuge to remove residual liquid).

c. Complete drying of magnetic beads

Problem: Residual ethanol can significantly reduce 260/230.

Improvement: Open the cap and let it dry for 5-10 minutos (at room temperature or 37°C), until there is no ethanol smell. Avoid excessive drying (otherwise, it will reduce the efficiency of nucleic acid elution).

 d. Optimize elution conditions

Use preheated elution buffer (such as 65°C TE buffer or sterile water), and let it stand for 5 minutes before collection.

Avoid using too small elution volume (recommend ≥ 50 μL to reduce salt concentration).

Ⅱ.Controle de qualidade of Reagents and Consumables

um. Replace with fresh reagents:

Check if ethanol and washing solution have been contaminated (if stored for a long time without sealing).

Avoid using expired magnetic bead reagents (magnetic bead degradation may adsorb impurities).

b. Consumables selection:

Use centrifuge tubes and pipettes without nuclease or pyrogen (to avoid interference from plastic additives).

Ⅲ.Sample preprocessing

1. Complex samples (such as soil and plants):

Increase the CTAB or SDS pretreatment to remove polysaccharides and polyphenols.

• For blood samples:

 First remove hemoglobin using erythrocyte lysis solution.

• Inhibitor-enriched samples (such as feces and body fluids):

Dilute the samples or use dedicated lysis buffers (such as those containing Carrier RNA).

Ⅳ.Verification and remedial measures

um. Electrophoresis or Qubit verification:

Check for degradation (tailing phenomenon) using agarose gel electrophoresis.

Compare the results with those from Nanodrop using a fluorescence meter (Qubit) to eliminate interference from impurity absorbance.

b. Purification remediation:

If the ratio of 260/230 remains low, purify the nucleic acid using a silica column or by ethanol precipitation again.

V. Control Experiment

For each extraction, a known standard sample (such as λDNA or cultured cells) is set up to confirm the stability of the reagents.

If the 260/230 ratio of the control sample is normal, the problem may lie in the sample being tested itself.

Common Problem Troubleshooting Checklist

Phenomenon	Possible Cause	Solução
260/230 is low but 260/280 is normal	Protein or phenol contamination	Strengthen the washing and drying steps
Both 260/230 e 260/280 are low	Protein or phenol contamination	Optimize the lysis, replace the lysis solution
Only the 230 peak is high	Organic solvent contamination	Check the purity of ethanol or buffer

By following these steps, the ratio of 260/230 can be significantly increased (target > 1.8). If the problem persists, please feel free to contact Shanghai Lingjun Biotechnology at 18103799069.

Fornecedor

Xangai Lingjun Biotecnologia Co., Ltda.foi estabelecido em 2016 que é um fabricante profissional de materiais biomagnéticos e reagentes de extração de ácido nucleico.

Temos vasta experiência em extração e purificação de ácidos nucleicos, purificação de proteínas, separação celular, quimioluminescência, e outras áreas técnicas.

Nossos produtos são amplamente utilizados em muitos campos, como exames médicos, testes genéticos, pesquisa universitária, melhoramento genético, e assim por diante. Nós não apenas fornecemos produtos, mas também podemos realizar OEM, ODM, e outras necessidades. Se você tiver uma necessidade relacionada, não hesite em contactar-nos .