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Frequently Asked Questions

Common questions about nucleic acid extraction and product usage

Is the total RNA from your Total RNA Extraction Kit completely DNA-free? How can I obtain DNA-free total RNA? +

Current total RNA extraction methods cannot completely remove DNA. Our total RNA kit uses a double-column method that removes most genomic DNA, but trace amounts may remain.

For purer RNA, we recommend:

  1. Homogenize samples with Trizol or equivalent reagent, add chloroform, mix, and centrifuge.
  2. Transfer the upper aqueous phase, add half volume of anhydrous ethanol, mix, and pass through the column (RNA binds to the column).
  3. Follow our manual for washing and elution steps.

DNase treatment is not recommended as digestion may be incomplete and may cause RNA degradation.

How should I store your products and what is the shelf life? +

Storage conditions vary by product:

  • Proteinase K: Store at 2-8°C for long-term storage
  • Other components: Store at room temperature, protected from light
  • Most products: 12-month shelf life (see product label)
  • Some products (e.g., probe purification kits): Store at -40°C~40°C, protected from light, up to 36 months
How can I place an order? +

Orders can be placed through the following channels:

  • Phone: +86-574-88024646 (Technical Support)
  • Mobile: +86-18868947323 (Sales)
  • Fax: +86-574-88024486
  • Email: zdbiotech@genepure.com

Please include catalog number, product name, quantity, delivery timeline, customer information, payment details, and shipping address with your order.

What is the delivery and acceptance procedure? +

Upon receiving goods, please immediately inspect:

  • Product name, packaging, and quantity
  • Check if packaging is intact

Do not sign for damaged goods. Contact our headquarters or local distributor immediately. Replacement will be arranged after verification.

What DNA fragment size range does the Gel Extraction Kit recover? What is the recovery rate? +

Our Gel Extraction Kit recovers DNA fragments from 100bp to 40kb with a recovery rate > 90%. Maximum binding capacity: 10μg (mini column), 40μg (midi column/96-well plate per well).

Can the DNA/RNA Probe Purification Kit purify small nucleic acid fragments? +

Yes. This kit is specifically designed for purifying nucleic acid probes <100bp and PCR primers. Tested recovery rate > 90% for 30bp DNA fragments. Uses a novel silica matrix and unique buffer system. Maximum binding capacity: 20μg (mini column), 100μg (midi column/96-well plate).

What is the maximum concentration factor of the DNA Enrichment Kit? +

Our DNA Enrichment Kit is designed for DNA solution concentration, achieving up to 50-fold concentration. It also removes oligonucleotides, primer dimers, and salts, providing simultaneous purification.

Do you have medical device registered clinical products? +

Yes, we hold multiple medical device registrations:

  • Nucleic Acid Extraction/Purification Reagent (Registration: Zhejiang Yong Medical Equipment Preparation No. 20150006)
  • Blood Nucleic Acid Extraction Kit (Registration: Zhejiang Yong FDA (Approval) No. 2011-1400128)
  • Nucleic Acid Extraction/Purification Reagent (Registration: Zhejiang Yong Medical Equipment Preparation No. 20150183)

    • These products are suitable for clinical in vitro diagnostic nucleic acid extraction, enrichment, and purification.