| Description | The content of this cell is too long for an XLSX file (more than 32767 characters). Please use the CSV format for this export | Inquire | The miRNA extraction kit is specifically designed to isolate and purify miRNAs from various animal tissues, plant tissues, cells, serum, plasma and other samples. It can also extract small molecule RNAs such as siRNA and snRNA that are less than 200 nt, and can also be used for the extraction of The miRNA extraction kit is specifically designed to isolate and purify miRNAs from various animal tissues, plant tissues, cells, serum, plasma and other samples. It can also extract small molecule RNAs such as siRNA and snRNA that are less than 200 nt, and can also be used for the extraction of total RNA. This product combines phenol/guanidine lysis technology and silicon matrix membrane purification technology. The unique lysis solution can effectively inhibit RNases while removing most of DNA and proteins from cell or tissue samples through organic extraction. For some sensitive downstream experiments, if miRNA enrichment is required, this kit can be used to enrich miRNA separately. This product is suitable for a wide range of samples, with high purity of prepared RNA, and can be directly used for sensitive downstream applications, such as Northern Blot analysis, Real Time PCR, Microarray Analysis, etc. M665531Component50 TStorageM665531ATRIzon Reagent60 mL2-8℃. Protect from ligt.M665531BBuffer RWT (concentrate)15 mLRTM665531CBuffer RW2 (concentrate)11 mLRTM665531DRNase-Free Water10 mLRTM665531ESpin Columns RM with Collection Tubes50 setsRTM665531FSpin Columns RS with Collection Tubes50 setsRTM665531GRNase-Free Centrifuge Tubes (1.5 mL)50 EART Self prepared reagents: chloroform, anhydrous ethanol (newly opened or dedicated for RNA extraction).Preparation and important precautions before the experiment:To prevent RNase pollution, attention should be paid to the following aspects:1) Use RNase free plastic products and gun heads to avoid cross contamination.2) Glassware should be dry baked at a high temperature of 180 ℃ for 4 hours before use, while plastic containers can be soaked in 0.5 M NaOH for 10 minutes, thoroughly rinsed with water, and then sterilized under high pressure.3) Prepare the solution using water without RNase.4) Operators should wear disposable masks and gloves, and change gloves frequently during the experiment.2. The extracted samples should avoid repeated freeze-thaw cycles, otherwise it will affect the quantity and quality of miRNA extraction.Before the first use, anhydrous ethanol should be added to Buffer RWT and Buffer RW2 according to the instructions on the reagent bottle label.4. All centrifugation steps should be carried out at room temperature unless otherwise specified, and all operation steps should be carried out quickly.Operation steps:Protocol A: miRNA enrichment (can be directly used for sensitive downstream experiments)1. Sample processing1a Organization: Grind the organization in liquid nitrogen. Add 1 ml of TRIzon Reagent to every 30-50 mg of tissue, shake and mix well. The sample volume shall not exceed one tenth of the volume of TRIzon Reagent.1b Single layer culture of cells: Remove the culture medium, add TRIzon Reagent, and add 1 ml of TRIzon Reagent every 10 cm2 (the amount of lysis solution depends on the area of the culture bottle).1c Cell suspension: Centrifuge to obtain cell precipitate, discard supernatant. Add 1 ml of TRIzon Reagent to every 5 x 106-1 x 107 cells (cells do not require washing).1d Plasma or serum: Take 200 µ Add 5 times the volume of TRIzon Reagent to plasma or serum samples, shake and mix well for 30 seconds.2. After adding TRIzon Reagent to the sample, blow it repeatedly several times to fully crack it. Leave at room temperature for 5 minutes to completely separate the protein nucleic acid complex.3. Optional steps: Centrifuge at 4 ℃ 12000 rpm (~13400 × g) for 5 minutes, take the supernatant, and transfer it to a new centrifuge tube (provided by oneself) (if the sample contains more proteins, fats, polysaccharides, etc., this step can be performed).4. Add chloroform to the supernatant and add 200 to every 1 ml of TRIzon Reagent used µ Chloroform, cover the tube, vigorously shake for 15 seconds, and let it sit at room temperature for 5 minutes.Centrifuge at 5.4 ℃ and 12000 rpm for 15 minutes. The sample is divided into three layers: red organic phase, middle layer, and colorless aqueous phase. Transfer the upper colorless aqueous phase to a new centrifuge tube (self prepared).6. Add 1/3 volume of anhydrous ethanol to the solution obtained in step 5, mix well, and transfer the obtained solution and precipitate together into the adsorption column RM (Spin Columns RM) that has been loaded into the collection tube. If you cannot add all the solution to the adsorption column at once, please transfer it multiple times. Centrifuge at 12000 rpm for 30 seconds, discard the adsorption column RM after centrifugation, and retain the effluent.7. Add 2/3 times the volume of anhydrous ethanol to the solution obtained in step 6 and mix well.8. Transfer the solution and precipitate obtained from the previous step into the adsorption column RS (Spin Columns RS) that has been loaded into the collection tube. If you cannot add all the solution to the adsorption column at once, please transfer it multiple times. Centrifuge at 12000 rpm for 30 seconds, discard the waste liquid in the collection tube, and place the adsorption column RS back into the collection tube.9. Add 700 to the adsorption column RS µ L Buffer RWT (check if anhydrous ethanol is added before use), centrifuge at 12000 rpm for 30 seconds, discard the waste liquid in the collection tube, and place the adsorption column RS back into the collection tube.10. Add 500 to the adsorption column RS µ Buffer RW2 (check if anhydrous ethanol is added before use), centrifuge at 12000 rpm for 30 seconds, discard the waste liquid in the collection tube, and place the adsorption column RS back into the collection tube.11. Repeat step 10.12. Centrifuge at 12000 rpm for 1 minute and discard the waste liquid from the collection tube. Place the adsorption column RS at room temperature for a few minutes to thoroughly air dry. Note: The purpose of this step is to remove residual ethanol from the adsorption column RS, which can affect subsequent enzymatic reactions (such as enzyme digestion, PCR, etc.).13. Place the adsorption column RS in a new RNase free centrifuge tube and add 30-50 to the middle of the adsorption column µ Place RNase Free Water at room temperature for 1 minute, centrifuge at 12000 rpm for 1 minute, collect RNA solution, and store the obtained RNA solution at -70 ℃ to prevent degradation.Attention:1) The volume of RNase Free Water should not be less than 30 µ l. Small volume affects the recovery rate.2) If you want to increase RNA production, you can use 30-50 µ Repeat step 13 for the new RNase Free Water.3) If you want to increase the RNA concentration, you can add the obtained solution back to the adsorption column RS and repeat step 13Protocol B: Extraction of total RNA (including miRNA and other small molecule RNAs<200 nt), steps 1-5 are the same as protocol A.6. Add 1.25 times the volume of anhydrous ethanol to the solution obtained in step 5 and mix well.7. Transfer the solution and precipitate obtained from the previous step into the spin columns RM that have been loaded into the collection tube. If you cannot add all the solution to the adsorption column RM at once, please transfer it multiple times. Centrifuge at 12000 rpm for 30 seconds, discard the waste liquid in the collection tube, and place the adsorption column RM back into the collection tube.8. Add 700 to the adsorption column RM µ L Buffer RWT (check if anhydrous ethanol is added before use), centrifuge at 12000 rpm for 30 seconds, discard the waste liquid in the collection tube, and place the adsorption column RM back into the collection tube.9. Add 500 to the adsorption column RM µ Buffer RW2 (check if anhydrous ethanol is added before use), centrifuge at 12000 rpm for 30 seconds, discard the waste liquid in the collection tube, and place the adsorption column RM back into the collection tube.10. Repeat step 9.11. Centrifuge at 12000 rpm for 1 minute and discard the waste liquid from the collection tube. Place the adsorption column RM at room temperature for a few minutes to thoroughly air dry. Attention: The purpose of this step is to remove residual ethanol from the adsorption column RM, which can affect subsequent enzymatic reactions (such as enzyme digestion, PCR, etc.).12. Transfer the adsorption column RM into a new RNase free centrifuge tube and add 30-50 to the middle of the adsorption column µ Place RNase Free Water at room temperature for 1 minute, centrifuge at 12000 rpm for 1 minute, collect RNA solution, and store the obtained RNA solution at -70 ℃ to prevent degradation. Attention: 1) The volume of RNase Free Water should not be less than 30 µ l. Small volume affects the recovery rate.2) If you want to increase RNA production, you can use 30-50 µ Repeat step 12 for the new RNase Free Water.3) If you want to increase the RNA concentration, you can add the obtained solution back to the adsorption column RM and repeat step 12... Read More | Inquire | Product introduction：PMA qPCR live bacteria detection kit provides an effective means to detect bacterial activity. This kit provides a mixture of PMA dye and SYBR green dye based qPCR. The optimal amount of dye and the number of samples that can be processed may vary depending on the type ofProduct introduction：PMA qPCR live bacteria detection kit provides an effective means to detect bacterial activity. This kit provides a mixture of PMA dye and SYBR green dye based qPCR. The optimal amount of dye and the number of samples that can be processed may vary depending on the type of sample. PMA is a DNA binding dye with high affinity, especially with double stranded DNA. The dye itself has weak fluorescence, but it can emit brighter fluorescence after binding with nucleic acids. PMA is impermeable to the cell membrane, so it can selectively modify the DNA of dead cells with damaged membrane. After bllight (~464 nm) photolysis of PMA modified DNA, the photoreactive azido group on PMA is converted into highly reactive azene radical, which reacts with any hydrocarbon moiety near the DNA binding site to form a stable covalent nitrogen carbon bond, resulting in permanent DNA modification. This modification process will make the DNA insoluble, and it will be lost together with cell debris in the later genomic DNA extraction process. The unbound PMA remaining in the solution reacts with water molecules under strong light irradiation and decomposes into hydroxylamine compounds without cross-linking activity, so that it can no longer covalently bind DNA. Based on this characteristic of PMA, our company combines PMA and qPCR technology to form a new detection method - PMA qPCR, which is used for the screening of live bacteria. At present, the method has been validated in a variety of bacterial strains as well as yeast, fungi, viruses and parasites. The treatment of complex samples, such as feces or soil, may require optimization of sample dilution, dye concentration, and light treatment time. Treatment of diluted samples, such as water testing, may require filtration or concentration prior to dye treatment. Component： Instruction： Precautions before use：1.This live bacteria detection kit distinguishes dead bacteria and live bacteria according to cell membrane permeability. Many methods of killing bacteria cause damage to the cell membrane and are therefore compatible with this kit. But some methods, such as ultraviolet irradiation, may not immediately cause cell membrane rupture. Therefore, before selecting this kit, it is necessary to carry out literature search and pre-experiment to determine whether the kit is suitable for the bacterial type and killing method you choose. 2.After PMA treatment, the bacteria need to be photolyzed to covalently bind the dye to dead cell DNA. Photolysis operations can use blue or white light sources. Generally speaking, the brighter the lamp, the higher the efficiency of the photolysis step. Non-LED lamps ( such as halogen lamps ) may heat your sample and have a negative impact on the analysis. Ice is required to cool the sample during irradiation. 3.Sample can be cryopreservation after photolysis. Frozen samples before PMA treatment photolysis may damage the cell membrane and produce false negative results. If the sample needs to be frozen before detection, it is recommended to perform a pre-experiment first. 4.Part of the mechanism of PMA is to remove PMA covalently modified DNA from the sample by precipitation ; therefore, when extracting genomic DNA, it is necessary to use the same volume of genomic DNA eluent for volume normalization. The positive control can use the genomic DNA of living cells. 5.In order to verify the effectiveness of PMA in the test sample, the Ct ( dCt ) changes between- / + PMA can be compared. Experimental materials ( self-provided )：①Light source ( used for the photolysis step after PMA modified DNA ) ;② Bacterial genomic DNA extraction kit ; Experimental procedure： 1.Suck 10 µL of E.coli bacterial solution in liquid LB medium, and culture E.coli in the bacterial incubator overnight or longer to the logarithmic growth phase ( OD600 ≈ 1.0 ) ; Note : The culture time is adjusted according to the experiment. 2.Two portions of live E.coli, 400 µL each, were placed in a clean centrifuge tube ; 3. ( Recommended ) Preparation of dead E.coli. If the dead E.coli is needed as a control, the dead E.coli can be obtained by heating the living E.coli in a water bath at 95 °C for 5 min, or at 58 °C for 3 h. the subsequent operation of the dead E. coli is the same as that of the living E. coli ; 4.Two copies of live E.coli, one without PMA treatment, and one with 25 µM PMA treatment ( the optimal PMA concentration for treating different types or different sources of bacteria needs to be consulted in the relevant literature ) ; 5.The PMA-treated samples were placed on a shaker at room temperature and incubated in the dark for 10 min to fully mix the dye with the sample ; 6.Exposure of the sample, you can use blue or white light source, irradiation time to explore their own. For example, a 60 W blue light can be used for 15 min. Note : 1 If a halogen lamp is used, we recommend that the PMA-treated sample tube be placed on an ice block 20 cm away from the light source. Ice should be placed in a transparent tray. Adjust the light source to point directly to the sample, photolysis for 5-15 min ; if the bacteria obtained from the environment are directly used for experiments, due to the complexity or turbidity of the environmental samples, the photolysis time needs to be prolonged appropriately. 7.Treated and untreated live E.coli 5000 × g, centrifuged for 10 min, remove the supernatant ; 8.Select the appropriate genomic DNA extraction kit according to the sample type, and use the same elution volume for each group of samples when elution DNA. Note : DNA extraction steps refer to the instructions of the kit used. Part of the mechanism of action of PMA is to remove PMA-bound DNA from the sample by precipitation ; therefore, when extracting genomic DNA, each group should use the same volume of genomic DNA eluent for volume normalization ( the amount of genomic DNA extracted from dead bacteria and live bacteria is inconsistent, so the concentration of the two is significantly different ). 9.Preparation of reaction mixture according to the following system : Note : 1 For the DNA extracted by commercial DNA extraction kit, the qPCR template was optimized with 2 µL as the initial volume ; 2 The template volume should not exceed 10 % of the final reaction volume ; 3 Template concentration : gDNA as template, usually 1-10 ng ; the final concentration of PCR primers is usually 0.4µM, which can get better results. When the reaction performance is poor, the primer concentration can be adjusted in the range of 0.2-1µM. 10.Slightly vortex the reaction mixture, transfer the fixed volume to the PCR tube. 11. Test procedureNote : 1 The extension time is adjusted according to the instrument ; the Taq enzyme in mix can be activated within 2 min, but the genomic DNA may require longer denaturation time, which can be increased at this time, and the specific denaturation time can be adjusted according to the sample type. 12. ( Optional ) Data analysis Using live bacteria and dead bacteria as controls, the number of live cells in the sample was analyzed and calculated. It is recommended to verify the suitability of primers and PCR procedures before starting PMA qPCR detection of live bacteria. Calculation of dead and living bacteria control dCt ( 1 ) After the end of qPCR, the Ct value of each sample was calculated by instrument software ; ( 2 ) By calculating the dCt of each control bacteria, it was judged whether PMA successfully inhibited the amplification of dead bacterial DNA. The calculation is as follows : dCt live = Ct ( live, PMA treated ) -Ct ( live, PMA untreated ) dCt die = Ct ( die, PMA treated ) -Ct ( die, PMA untreated ) ( 3 ) The dCt expectation of living bacteria is close to 0 ± 1, which indicates that PMA does not affect the amplification of living cell DNA ; ( 4 ) The expected value of dCt of dead bacteria is greater than 4 ( dCt is 4 means that it is reduced by about 16 times, that is, 94 % of dead bacterial DNA is removed ; a dCt of 8 indicated a decrease of about 250 times, that is, 99.6 % of the dead bacterial DNA was removed ).( 5 ) The dCt of dead bacteria depends on many factors, including : strain / cell type ; the way bacteria are killed ; the concentration of PMA used ; amplified sequence length. 3. Calculation of the proportion of viable ( optional ) bacteria If the control results of dead and live bacteria are normal, the proportion of live bacteria in the sample can be calculated.( 1 ) Calculate the dCt value of the sample : dCt sample = Ct ( sample, PMA treated ) -Ct ( sample, PMA untreated ) ( 2 ) Conversion of dCt value to live bacteria ratio : PMA inhibition multiple = 2 ( sample dCt ) Viable bacteria % = 100 / PMA inhibition multiple 14. ( Optional ) Calculate the absolute number of live bacteria If you want to calculate the absolute number of viable bacteria in the sample, you need to use a known number of target bacteria genomic DNA to make a standard curve. It is recommended that the diluted concentrations of several groups of genomes are within the range of the qPCR analysis system. ( 1 ) qPCR was performed with the appropriate genome, and the Ct value was used as the ordinate, and the number of cells was used as the abscissa. The R2 value is calculated to determine the linearity, and the slope and y-axis intercept are displayed.( 2 ) Calculate the copy number of the experimental samples : Ct = slope * cell number + y axis intercept ( y = mx + b ) Bacterial count sample = ( Ct-y axis intercept ) / slope Note : The live bacterial DNA was not lost during the purification process. Examples : Product parameters：Pma: ex = 464 nm; Ex/em = 510/610 nm (following photolysis and reaction with dna/rna)Scope of application：Live bacteria detection Matters needing attention：1.Please instantaneously centrifuge the product to the bottom of the tube before use, and then carry out subsequent experiments ; 2.the kit components contain fluorescent dyes, and attention should be paid to avoiding light during use and preservation ; 3.For your safety and health, please wear experimental clothes and disposable gloves... Read More |