50 prep

Introduction and Overview

E.Z.N.A.® Blood RNA Kits are designed for isolation of total intracellular RNA from up to 1 mL of fresh, whole blood treated with any common anticoagulant such as heparin, EDTA, or acid-citrate-dextrose. Total RNA yield from 1 mL of blood ranges from 1–5 μg. The Blood RNA Kit procedure efficiently removes contaminants and enzyme inhibitors making total RNA isolation fast, convenient, and reliable. There is no need for phenol/chloroform extractions, and time-consuming steps, such as CsCl gradient ultracentrifugation and precipitation with isopropanol or LiCl, are eliminated. This kit also is suitable for isolation of total RNA from cultured cells, tissues, bacteria, and RNA viruses. RNA purified using the E.Z.N.A.® Blood RNA method is ready for applications such as RT-PCR.

Overview

The E.Z.N.A.® Blood RNA Kits use the reversible binding properties of HiBind® matrix, a new silica-based material. This is combined with the speed of mini spin column technology. Red blood cells are selectively lysed and white cells collected by centrifugation. After lysis of white blood cells under denaturing conditions that inactivate RNases, total RNA is purified with the HiBind® RNA Mini Column. A specially formulated high salt buffer system allows RNA molecules greater than 200 bases to bind to the matrix. Cellular debris and other contaminants (such as hemoglobin) are effectively washed away and high-quality RNA is eluted in Nuclease-free Water.

New in this Edition:

November 2018:

• DEPC Water has been replaced with Nuclease-free Water. DEPC Water is no longer provided in this kit.

• PR032 (DEPC Water, 100 mL) has been discontinued and is no longer available to purchase.

June 2013:

• This manual has been edited for content and redesigned to enhance user readability

Product	R6950-00	R6950-01
Purifications	5 preps	50 preps
HiBind® RNA Mini Columns	5	50
Homogenizer Mini Columns	5	50
2 mL Collection Tubes	15	150
ERL Buffer (10X)	5 mL	50 mL
NTL Lysis Buffer	5 mL	40 mL
RWF Wash Buffer	5 mL	45 mL
RNA Wash Buffer II	5 mL	25 mL
Nuclease-free Water	2 mL	15 mL
User Manual

Storage and Stability

E.Z.N.A.® Blood RNA Kits should be stored at room temperature. During shipment, crystals may form in the NTL Lysis Buffer. Warm to 37°C to dissolve. All kit components are guaranteed for 12 months from the date of purchase.

 

Modified Protocols

E.Z.N.A.® Blood RNA Kits may also be used for isolation of total RNA from cultured cells, tissues, bacteria, and from acellular body fluids. In addition, RNA from enzymatic reactions, such as in vitro transcription, can be purified with this product. For other modified protocols, please contact our technical support or customer service.

1. Dilute ERL Buffer with sterile deionized water as follows and store at room temperature.

Kit	Sterile Deionized Water to be Added
R6814-00	45 mL
R6814-01	450 mL

2. Dilute RNA Wash Buffer II with 100% ethanol as follows and store at room temperature.

Kit	100% Ethanol to be Added
R6814-00	20 mL
R6814-01	100 mL

 

Before Beginning

Important Notes

Please take a few minutes to read this booklet in its entirety to become familiar with the procedures.

• Whenever working with RNA, always wear gloves to minimize RNase contamination. Use only clean RNase-free disposable plastic pipette tips when using the supplied reagents.

• Equilibrate samples and reagents to room temperature before beginning this protocol. All steps should be carried out at room temperature unless otherwise noted. Work quickly, but carefully.

• Prepare all materials required before starting the procedure to minimize RNA degradation.

• Carefully apply the sample or solution to the center of the HiBind® RNA Mini Columns. Avoid touching the membrane with pipet tips.

• 2-mercaptoethanol is key in denaturing RNases and must be added to an aliquot of NTL Lysis Buffer before use. Add 20 μL 2-mercaptoethanol per 1 mL NTL Lysis Buffer. This mixture can be stored for 4 weeks at room temperature.

Starting Materials

E.Z.N.A.® Blood RNA Kits are designed for purification of total RNA from up to 1 mL fresh whole blood. Although the binding capacity for the HiBind® RNA Mini Column is approximately 100 μg, the maximum amount of starting material depends on the lysis volume. Due to the abundance of erythrocytes and proteins, greater than 1 mL whole blood will significantly lower RNA quality. Leukocytes have relatively low RNA content; therefore, the maximum binding capacity of HiBind® RNA Mini Columns cannot be reached.

Samples should be collected in the presence of an anticoagulant (preferably acid-citratedextrose) and processed within a few hours. Minimize storage time prior to RNA isolation as leukocyte transcripts generally have variable stabilities and avoid freezing the blood samples. The E.Z.N.A.® Blood RNA procedure involves erythrocyte lysis and removal which cannot be accomplished with frozen blood.

Quantification and Storage of RNA

To determine the concentration and purity of RNA, measure absorbance at 260 nm and 280 nm with a spectrophotometer. One OD unit measured at 260 nm corresponds to 40 μg/mL RNA. Nuclease-free Water is slightly acidic and can lower A260/A280 ratios. Use TE buffer to dilute RNA prior to spectrophotometric analysis. The A260/A280 ratio of pure nucleic acids is 2.0, while an A260/A280 ratio of 0.6 denotes pure protein. A ratio of 1.8-2.0 corresponds to 90%-100% pure nucleic acid. Phenol has a maximum absorbance at 270 nm and can interfere with spectrophotometric analysis of DNA or RNA. Store RNA samples at -70°C in water. Under these conditions, RNA is stable for more than a year.

Integrity of RNA

It is highly recommended that RNA quality be determined prior to beginning all downstream applications. The quality of RNA can be best assessed by denaturing agarose gel electrophoresis with ethidium bromide staining. The ribosomal RNA bands should appear as sharp, clear bands on the gel. The 28S band should appear to be double that of the 18S RNA band (23S and 16S if using bacteria). If the ribosomal RNA bands in any given lane are not sharp and appear to be smeared towards the smaller sized RNA, it is very likely that the RNA undergone degradation during the isolation, handling, or storage procedure. Although RNA molecules less than 200 bases in length do not efficiently bind to the HiBind® matrix, a third RNA band, the tRNA band, may be visible when a large number of cells are used.

E.Z.N.A.® Blood RNA Kit - Isolation of Total RNA from Blood

Equipment and Reagents to be Supplied by User:

• 2-mercaptoethanol

• 100% ethanol

• 70% ethanol

• Sterile deionized water

• RNase-free pipette tips

• RNase-free 1.5 mL microcentrifuge tubes

• RNase-free 15 mL conical tubes (depending on sample size)

• Microcentrifuge capable of 13, 000 x g

• Refrigerated microcentrifuge (if available)

• Centrifuge with swinging-bucket rotor for 15 mL centrifuge tubes

Before Starting:

• Refrigerated microcentrifuge should be set to 4°C

• Prepare an ice bucket

• Prepare the following buffers:

1. ERL Buffer and the RNA Wash Buffer II according to the instructions on Page 4

2. NTL Lysis Buffer according to the instructions on Page 5

Note: After red blood lysis and removal, all remaining steps must be carried out at room temperature. Work quickly, but carefully.

1. Add 5 volumes ERL Buffer in an appropriately sized tube (not provided). Vortex to mix thoroughly. For example, add 5 mL ERL Buffer to 1 mL blood in a 15 mL conical tube or add 500 μL ERL Buffer to 100 μL blood in a 1.5 mL microcentrifuge tube.

Note: ERL Buffer is supplied as a 10X concentrate and must be diluted with sterile deionized water before use. Refer to Page 4 or the label on the bottle for directions.

2. Let sit on ice for 15 minutes. Vortex twice during incubation.

Note: Lysis of red blood cells is indicated when the solution becomes translucent. For blood samples from individuals with an elevated hematocrit or elevated erythrocyte sedimentation rate (ESR), extend the incubation time to 20 minutes.

3. Centrifuge at 400 x g at 4°C for 10 minutes to pellet leukocytes. Completely remove and discard the supernatant. If a refrigerated centrifuge is not available, centrifuge at room temperature, but quickly complete Step 4 below.

4. Add 2 volumes of ERL Buffer per volume of whole blood used in Step 1. Vortex to resuspend cells.

Note: For example, if you began the protocol with 1 mL whole blood, wash the leukocyte pellet with 2 mL ERL Buffer.

5. Centrifuge at 400 x g at 4°C for 10 minutes. Completely remove and discard the supernatant. If a refrigerated centrifuge is not available, centrifuge at room temperature, but quickly complete Step 6 below.

6. Add NTL Lysis Buffer to the pelleted white blood cells. For <500 μL whole blood, add 400 μL NTL Lysis Buffer. For 0.5-1.0 mL whole blood, add 700 μL NTL Lysis Buffer. Vortex to mix thoroughly. Samples may be safely stored at -70°C after addition of NTL Lysis Buffer.

Note: 2-mercaptoethanol is crucial for inactivating endogenous RNases and must be added to an aliquot of NTL Lysis Buffer. Add 20 μL 2-mercaptoethanol per 1 mL NTL Lysis Buffer. This mixture is stable at room temperature for 4 weeks.

7. Insert a Homogenizer Mini Column into a 2 mL Collection Tube provided with this kit.

8. Transfer the cell lysate directly to the Homogenizer Mini Column.

Note: If too many cells have been used, the cell lysate will be too viscous to pipet. In this case, divide the sample into two aliquots and adjust the volume of each aliquot to 700 μL with NTL Lysis Buffer. Continue the protocol from Step 7 with two Homogenizer Mini Columns and two HiBind® RNA Mini Columns.

9. Centrifuge at maximum speed for 2 minutes.

10. Save the filtrate and discard the Homogenizer Mini Column.

11. Add an equal volume of 70% ethanol. Vortex to mix. A precipitate may form after the addition of ethanol. This will not interfere with RNA isolation.

12. Insert a HiBind® RNA Mini Column into a 2 mL Collection Tube provided with this kit.

13. Transfer 700 μL (including any precipitate) to the HiBind® RNA Mini Column.

14. Centrifuge at >10,000 x g for 30 seconds.

15. Discard the filtrate and reuse the Collection Tube.

16. Repeat Steps 13-15 until all of the sample has been transferred to the column.

Optional: This the starting point of the optional on-membrane DNase I Digestion Protocol. Since the HiBind® matrix of the RNA Mini Column eliminates most DNA, DNase I digestion generally is not necessary for most downstream applications. However, certain sensitive RNA applications may require further DNA removal. If an additional RNA removal step is required, please continue to the DNase I Digestion Protocol found on Page

17. (See DNase I Digestion Set, Cat # E1091 for further information). If DNase I digestion is not required, proceed to Step 17. 17. Add 500 μL RWF Wash Buffer to the HiBind® RNA Mini Column.

18. Centrifuge at >10,000 x g for 30 seconds.

19. Discard the filtrate and the Collection Tube.

20. Transfer the HiBind® RNA Mini Column into a 2 mL Collection Tube provided with this kit.

21. Add 700 μL RNA Wash Buffer II.

Note: RNA Wash Buffer II must be diluted with 100% ethanol before use. Please see Page 4 for instructions.

22. Centrifuge at >10,000 x g for 30 seconds.

23. Discard the filtrate and reuse the Collection Tube.

24. Repeat Steps 21-23 for a second RNA Wash Buffer II wash step.

25. Centrifuge at maximum speed for 2 minutes to completely dry the HiBind® RNA Mini Column matrix.

Note: It is important to dry the HiBind® RNA Mini Column matrix before elution. Residual ethanol may interfere with downstream applications.

26. Transfer the HiBind® RNA Mini Column to a clean 1.5 mL microcentrifuge tube (not provided).

27. Add 50-100 μL Nuclease-free Water.

Note: Make sure to add water directly onto the HiBind® RNA Mini Column matrix.

28. Centrifuge at maximum speed for 2 minutes and store eluted RNA at -70°C.

Note: Any combination of the following steps can be used to help increase RNA yield.

• Preheat the Nuclease-free Water to 70°C before adding to the column.

• After adding the Nuclease-free Water, incubate the column for 5 minutes.

• Increase the elution volume.

• Repeat the elution step with fresh Nuclease-free Water (this may increase the yield, but decrease the concentration).

• Repeat the elution step using the eluate from the first elution (this may increase yield while maintaining elution volume).

Note: No RNA extraction procedure can completely remove genomic DNA. For very sensitive work we suggest that you treat the eluted RNA with RNase-free DNase. Also for RT-PCR, use intron-spanning primers that allow easy identification of DNA-contamination. A control PCR reaction containing the RNA as template will also allow detection of DNA contamination.

E.Z.N.A.® Blood RNA Kit - Isolation of Total RNA from Animal Tissue

Materials and Reagents to be Supplied by User:

• 2-mercaptoethanol

• 100% ethanol

• 70% ethanol

• Sterile deionized water

• RNase-free pipette tips

• RNase-free 1.5 mL microcentrifuge tubes

• RNase-free 15 mL conical tubes (depending on sample size)

• Microcentrifuge capable of 13,000 x g • Refrigerated microcentrifuge (if available) • Centrifuge with swinging-bucket rotor for 15 mL centrifuge tubes

Before Starting:

• Refrigerated microcentrifuge should be set to 4°C

• Prepare an ice bucket

• Prepare the following buffers:

1. ERL Buffer and the RNA Wash Buffer II according to the instructions on Page 4

2. NTL Lysis Buffer according to the instructions on Page 5

Sample Disruption and Homogenization Equipment:

• Liquid nitrogen

• Homogenizer Mini Columns (Cat# HCR001, HCR003)

• Capless 2.0 mL Collection Tubes (Cat# SSI-1370-00)

• Needle and syringe

• Mortar and pestle

• Glass beads

• Rotor-stator homogenizer

Disruption and Homogenization of Samples:

Efficient sample disruption and homogenization is essential for successful total RNA isolation. Cell wall and plasma membrane disruption is necessary for the release of RNA from the sample and homogenization is necessary to reduce the viscosity of the lysates. Homogenization shears genomic DNA and other high-molecular-weight cell components creating a homogenous lysate. Incomplete homogenization can cause the HiBind® RNA Mini Column to clog resulting in low or no yield.

Liquid Nitrogen Method

1. Wear appropriate gloves and take great care when working with liquid nitrogen.

2. Excise tissue and promptly freeze in a small volume of liquid nitrogen.

3. Grind tissue with a ceramic mortar and pestle under approximately 10 mL liquid nitrogen.

4. Pour the suspension into a pre-cooled 15 mL polypropylene tube.

Note: Unless the tube is pre-cooled in liquid nitrogen, the suspension will boil vigorously and may cause loss of tissue.

5. Allow the liquid nitrogen to completely evaporate and add NTL Lysis Buffer.

6. Proceed to one of the homogenization steps below.

Homogenization - Choose one method below • Homogenizer Mini Columns and 2 mL Collection Tubes (Cat# HCR001, HCR003 and SSI-1370-00)

1. Load the lysate into a homogenizer spin column pre-inserted into a 2 mL Collection Tube.

2. Centrifuge at maximum speed for 2 minutes in a microcentrifuge and save the filtrate.

3. Proceed to Step 1 of the “Protocol for Isolation of Total RNA from Animal Tissue” on Page 13.

• Syringe and needle

1. Shear high-molecular-weight DNA by passing the lysate through a narrow needle (19-21 gauge) 5-10 times.

2. Proceed to Step 1 of the “Protocol for Isolation of Total RNA from Animal Tissue” on Page 13.

Rotor-Stator Homogenizer: Sample Disruption and Homogenization

Using a rotor-stator homogenizer for sample disruption and homogenization can simultaneously disrupt and homogenize most samples. The process usually takes less than a minute depending on sample type. Many rotor-stator homogenizers operate with differently sized probes or generators that allow sample processing in 50 mL tubes.

Bead Milling: Sample Disruption and Homogenization

By using bead milling, cells and tissue can be disrupted and homogenized by rapid agitation in the presence of glass beads and a lysis buffer. The optimal size of glass beads to use for RNA isolation are 0.5 mm for yeast/unicellular cells and 4-8 mm for animal tissue samples.

Protocol for Isolation of Total RNA from Animal Tissue:

1. Determine the proper amount of starting material.

Note: It is critical to use the correct amount of starting tissue to obtain optimal yield and purity with the HiBind® RNA Mini Column. The maximum amount of tissue that can be processed is dependent on the type of tissue and its RNA content. The maximum binding capacity of the HiBind® RNA Mini Column is 100 µg. The maximum amount of tissue that can be used with 700 μL NTL Lysis Buffer is 30 mg. Use the following table as a guide to select the correct amount of starting material. If information regarding the RNA content of your starting material is not available, use 10 mg tissue. Based on yield and quality of RNA obtained, the starting amount can be adjusted up or down for the next purification.

Average Yield of Total Cellular RNA From Mouse Tissue

Source	Amount of Tissue (mg)	RNA Yield (μg)
Brain	10	10
Kidney	10	30
Liver	10	45
Heart	10	5
Spleen	10	33
Lung	10	12
Pancreas	10	40
Thymus	10	20

2. Add the appropriate amount of NTL Lysis Buffer based on the table below.

Amount of Tissue (mg)	Amount of NTL Lysis Buffer (μL)
≤15	350
15-30	700

 

Note: 2-mercaptoethanol is crucial for inactivating endogenous RNases and must be added to an aliquot of NTL Lysis Buffer. Add 20 μL 2-mercaptoethanol per 1 mL NTL Lysis Buffer. This mixture is stable at room temperature for 4 weeks.

3. Disrupt and homogenize the tissue sample with NTL Lysis Buffer. (Do not use more than 30 mg of tissue).

4. Homogenize cells with a rotor-stator homogenizer or until the sample is uniformly homogenized. Alternatively, sample can be homogenized by other methods as described on Page 11.

Note: Incomplete homogenization of the sample will cause lower yields and clogging of the column. It is recommended to homogenize the sample with rotor-stator homogenizers since it normally produces better yields.

5. Centrifuge at 13,000 x g for 5 minutes.

6. Transfer the cleared supernatant to a clean 1.5 ml centrifuge tube (not supplied).

Note: In some preparations, a fatty upper layer will form after centrifugation. Transferring any of the fatty upper layer may reduce RNA yields or clog the column.

7. Add an equal volume of 70% ethanol to the lysate. Vortex to mix thoroughly. Do not centrifuge. If any sample has lost its volume during homogenization, adjust the volume of ethanol accordingly.

Note: A precipitate may form after the addition of ethanol in certain preparations. This does not affect the procedure.

8. Insert a HiBind® RNA Mini Column into a 2 mL Collection Tube provided with this kit.

9. Transfer 700 μL of the sample (including any precipitate that may have formed) to the HiBind® RNA Mini Column.

10. Centrifuge at >10,000 x g for 30 seconds.

11. Discard the filtrate and reuse the Collection Tube.

12. Repeat Steps 9-11 until all of the sample has been transferred to the column.

Optional: This the starting point of the optional on-membrane DNase I Digestion Protocol. Since the HiBind® matrix of the RNA Mini Column eliminates most DNA, DNase I digestion generally is not necessary for most downstream applications. However, certain sensitive RNA applications may require further DNA removal. If an additional RNA removal step is required, please continue to the DNase I Digestion Protocol found on Page 17. (See DNase I Digestion Set, Cat # E1091 for further information). If DNase I digestion is not required, proceed to Step 13.

13. Add 500 μL RWF Wash Buffer to the HiBind® RNA Mini Column.

14. Centrifuge at 10,000 x g for 30 seconds.

15. Discard the filtrate and reuse the Collection Tube.

16. Add 700 μL RNA Wash Buffer II to the HiBind® RNA Mini Column.

Note: RNA Wash Buffer II must be diluted with 100% ethanol before use. Please see Page 4 for instructions.

17. Centrifuge at 10,000 x g for 30 seconds.

18. Discard the filtrate and reuse the Collection Tube

19. Repeat Steps 16-18 for a second RNA Wash Buffer II wash step.

20. Centrifuge at maximum speed (≥12,000 x g) for 2 minutes to completely dry the HiBind® RNA Mini Column matrix.

Note: It is important to dry the HiBind® RNA Mini Column matrix before elution. Residual ethanol may interfere with downstream applications.

21. Transfer the HiBind® RNA Mini Column to a clean 1.5 mL microcentrifuge tube (not provided).

22. Add 40-70 μL Nuclease-free Water.

Note: Make sure to add water directly onto the HiBind® RNA Mini Column matrix.

23. Centrifuge at maximum speed for 2 minutes and store eluted RNA at -70°C.

Note: Any combination of the following steps can be used to help increase RNA yield.

• Preheat the Nuclease-free Water to 70°C before adding to the column.

• After adding the Nuclease-free Water, incubate the column for 5 minutes.

• Increase the elution volume.

• Repeat the elution step with fresh Nuclease-free Water (this may increase the yield, but decrease the concentration).

• Repeat the elution step using the eluate from the first elution (this may increase yield while maintaining elution volume).

E.Z.N.A.® Blood RNA Kit - DNase I Digestion Protocol

Since the HiBind® matrix of the RNA Column eliminates most DNA, DNase I digestion generally is not necessary for most downstream applications. However, certain sensitive RNA applications may require further DNA removal. (See DNase I Digestion Set, Cat # E1091 for further information).

After completing Steps 1-16 of the Blood Protocol (Pages 7-9) or Steps 1-12 of the Animal Tissue Protocol (Pages 11-15), proceed with the following protocol.

User Supplied Material:

• DNase I Digestion Set (Cat# E1091)

1. For each HiBind® RNA Mini Column, prepare the DNase I stock solution as follows:

Buffer	Volume per Prep
E.Z.N.A.® DNase I Digestion Buffer	73.5 μL
RNase-free DNase I (20 Kunitz/µL)	1.5 μL
Total Volume	75 μL

Important Notes:

• DNase I is very sensitive and prone to physical denaturing. Do not vortex the DNase I mixture. Mix gently by inverting the tube.

• Freshly prepare DNase I stock solution right before RNA isolation.

• Standard DNase buffers are not compatible with on-membrane DNase I digestion. The use of other buffers may affect the binding of RNA to the HiBind® matrix and may reduce RNA yields and purity.

• All steps must be carried out at room temperature. Work quickly, but carefully.

2. Insert the HiBind® RNA Mini Column containing the sample into a 2 mL Collection Tube provided with this kit.

3. Add 250 µL RWF Wash Buffer to the HiBind® RNA Mini Column.

4. Centrifuge at 10,000 x g for 60 seconds.

5. Discard the filtrate and reuse the Collection Tube.

6. Add 75 μL DNase I digestion mixture directly onto the surface of the membrane of the HiBind® RNA Mini Column.

Note: Pipet the DNase I directly onto the membrane. DNA digestion will not be complete if some of the mixture is retained on the wall of the HiBind® RNA Mini Column.

7. Let sit at room temperature for 15 minutes.

8. Add 250 μL RWF Wash Buffer to the HiBind® RNA Mini Column.

9. Let sit at room temperature for 2 minutes.

10. Centrifuge at 10,000 x g for 60 seconds.

11. Discard the filtrate and reuse the Collection Tube.

12. Add 700 μL RNA Wash Buffer II.

Note: RNA Wash Buffer II must be diluted with 100% ethanol before use. Please see Page 4 for instructions.

13. Centrifuge at 10,000 x g for 60 seconds.

14. Discard the filtrate and reuse the Collection Tube.

15. Repeat Steps 12-14 for a second RNA Wash Buffer II wash step

16. Centrifuge at maximum speed for 2 minutes to completely dry the HiBind® RNA Mini Column matrix.

Note: It is important to dry the HiBind® RNA Mini Column matrix before elution. Residual ethanol may interfere with downstream applications.

17. Place the column in a clean 1.5 mL microcentrifuge tube (not supplied).

18. Add 40-70 μL Nuclease-free Water.

Note: Make sure to add water directly onto the HiBind® RNA Mini Column matrix.

19. Let sit at room temperature for 1 minute.

20. Centrifuge at maximum speed for 2 minute and store eluted RNA at -70°C.

Note: Any combination of the following steps can be used to help increase RNA yield.

• Preheat the Nuclease-free Water to 70°C before adding to the column.

• After adding the Nuclease-free Water, incubate the column for 5 minutes.

• Increase the elution volume.

• Repeat the elution step with fresh Nuclease-free Water (this may increase the yield, but decrease the concentration).

• Repeat the elution step using the eluate from the first elution (this may increase yield while maintaining elution volume).

Troubleshooting Guide

Please use this guide to troubleshoot any problems that may arise. For further assistance, please contact the technical support staff, toll free, at 1-800-832-8896.

Problem	Cause	Solution
Little or no RNA eluted	RNA remains on the column	• Repeat elution. • Pre-heat Nuclease-free Water to 70°C prior to elution. • Incubate column for 10 minutes with water prior to centrifugation.
	Column is overloaded	• Reduce the quantity of the starting material.
Clogged column	Incomplete homogenization	• Completely homogenize sample. • Increase centrifugation time. • Reduce the amount of starting material.
Degraded RNA	Source	• Freeze starting material quickly in liquid nitrogen. • Do not store cultured cells prior to extraction unless they are lysed first. • Follow protocol closely, and work quickly.
	RNase contamination	• Ensure not to introduce RNase during the procedure. • Check buffers for RNase contamination.
Problem in downstream applications	Salt carry-over during elution	• Ensure RNA Wash Buffer II been diluted with 4 volumes of 96-100% ethanol as indicated on bottle. • RNA Wash Buffer II must be stored and used at room temperature. • Repeat wash with RNA Wash Buffer II.
DNA contamination	HiBind® RNA Mini Column is overloaded	• Reduce the amount of starting material. • Digest with RNase-free DNase and inactivate at 75°C for 5 minutes
Low Abs ratios	RNA diluted in acidic buffer or water	• Nuclease-free Water is slightly acidic and can lower A260/A280 ratios. Use TE buffer to dilute RNA prior to spectrophotometric analysis.

The following components are available for purchase separately.

(Call Toll Free at 1-800-832-8896)

Product (Size)	Part Number
DNase I Digestion Kit (1500 Units, 50 preps)	E1091
ERL Buffer (250 mL)	PR023
RNA Wash Buffer II (50 mL)	PR031
Nuclease-free Water (1000 mL)	PD092
DNase/RNase-free Microcentrifuge Tubes (500/pk, 10 pk/cs)	SSI-1210-00

  

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