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    Highly efficient purification of miRNA and total RNA by combining the stringency of guanidinium thiocyanate lysis with the speed and purity of silica-membrane column purification.

    Product Highlights

    • Fast – streamlined protocol for reliable extraction of all miRNA species in as little as 30 minutes from a wide variety of plant samples
    • Specific – buffering conditions and column matrix specially developed for extraction of the miRNA population  
    • Efficient – excellent recovery of all small RNA species (<200 nt) from even very limiting amounts of sample
    • Unbiased – column-based purification eliminates bias in the small RNA molecule population that can occur with organic solvents
    • Flexible - optional protocol for parallel extraction of all larger RNA species thereby enabling extraction of total RNA
    • Convenient - all necessary components, including filters (shredders) and DNase I are included in the kit

    Product Description

    The ISOLATE II Plant miRNA Kit provides a simple, efficient column-based method for the isolation of miRNA and total RNA from a wide variety of starting materials, without the need for hazardous reagents such as phenol, which has been reported to introduce significant bias in recovery of selected small RNAs.

    By combining the stringency of guanidinium-thiocyanate lysis with the speed and ease-of-use of two silica-membrane purification columns, the ISOLATE II Plant miRNA Kit provides a fast method for the purification of high-quality total RNA on the first column and miRNA on the second column, from fresh, frozen and lyophilized plant cells and tissues.

    For applications that are sensitive to very small amounts of DNA, residual amounts of contaminating DNA can be removed using a convenient on-column DNase treatment with RNase-free DNase I that is supplied with the kit.

    The ISOLATE II Plant miRNA Kit has been designed to deliver optimal performance in RT-qPCR in conjunction with either the SensiFAST cDNA Synthesis Kit and SensiFAST Real-Time PCR Kits, or the SensiFAST One-Step Real-Time RT-PCR Kits. Additionally, the ISOLATE II Plant miRNA Kit can be used to purify samples for PCR and RT-PCR amplification using the Tetro cDNA Synthesis Kit and any enzyme from the Bioline PCR portfolio, including MyTaq DNA Polymerase. This kit is also ideal for purification of miRNAs prior to small RNA library construction for small RNA-Seq, single cell assays and microarray analysis.


    • RT-qPCR
    • miRNA profiling
    • Array analysis
    • End-point RT-PCR
    • Northern blotting
    • Tissue expression profiling
    • Biomarker discovery
    • Microarray analysis
    • RNA-Seq
    Fast purification of high-quality miRNA and total RNA from a wide variety plant species.

    Nucleic Acid Isolation Guide

    Download the ISOLATE II Guide with detailed product descriptions and performance data to help you choose the best product for your research

    We’ve started building a collection of short written and video reviews that we share online with the research community. Would you like to share your experience of the ISOLATE II Plant miRNA Kit as part of our new customer review program? To watch or read our reviews, to learn more about the rewards being offered, or to post your own review, please click here

    Product Selection

    Please refer to the ISOLATE II Selection Chart to confirm the applications for which ISOLATE II Plant miRNA Kit is the most recommended kit for your application.


    Certification of Analysis (COAs)



    Reagent 25 Preps
    ISOLATE II BioFilters 25
    ISOLATE II Large RNA Removal Columns 25
    ISOLATE II miRNA Columns 25
    Collection Tubes (2 mL) 50
    Collection Tubes (2 mL) 25
    Elution Tubes (1.7 mL) 50
    Lysis Buffer RPX 30 mL
    Wash Buffer W1 38 mL
    DNase I Solution (RNase-free) 0.8 mL
    DNase I Reaction Buffer DRB 6 mL
    RNA Elution Buffer 6 mL
    Product Manual 1
    Bench Protocol Sheet 1

    Storage & Stability

    The DNase I Solution should be stored at -20°C upon arrival. All other components should be stored dry and at room temperature.

    When stored under the recommended conditions and handled correctly, full activity of reagents is retained until the expiry date indicated on the outer box label.

    Shipping conditions

    Ambient temperature


    The columns supplied with the ISOLATE II kits may appear similar, but each type has been optimized to work within the buffer system supplied with the corresponding kit. The swapping of columns (or buffers) between kits may lead to no recovery of nucleic acid whatsoever, or at the very least severely impaired purification.

    Interruption of the DNA/RNA extraction process is possible after the sample lysis only. It is possible to homogenize and lyse the samples and to store them in the freezer until use for RNA extraction. RNA clean up with a column cannot be interrupted and we recommend to avoid delays during the column purification process. If a delay is unavoidable the columns should be stored on ice.

    An increase of A230 values may be caused by different substances, like carbohydrates, peptides and phenol. A bad A230/A260 ratio in RNA samples is mostly due to a contamination with guanidinium thiocyanate which is present in several reagents used for RNA extraction, for instance in the lysis buffer. In contrast to a bad A280/A260 ratio it does not automatically reflect a bad RNA quality. Currently there is no consensus about a lower limit of this ratio and mostly a carry-over of guanidinium thiocyanate does not affect the reliability of downstream applications. Nevertheless, an extra washing step with RW2 would be helpful to avoid this problem. And it would be helpful to pipet the flow-through out of the collection tube, instead of pouring it off. 

    It is possible to use the ISOLATE II Plant DNA and RNA kits. The optimized lysis of these kits may be also useful for processing difficult to lyse bacteria and fungi in soil samples

    These samples are treated as usual, just remove the RNAlater solution.

    We recommend the ISOLATE II Biofluids RNA kit for the extraction of cell free RNA. The kit isolates all sizes of RNA and is compatible with very limited, or challenging sample sources containing low RNA content.

    We recommend our ISOLATE II Biofluids RNA, miRNA and Plant miRNA kits. The miRNA kits are able to capture all small RNA species (<200 nt) from plant cells and tissues and to purify high quality large RNA (>200 nt) from the same sample in parallel. The ISOLATE II miRNA Kits have been developed to overcome the bias observed with small RNA isolation using phenol-based techniques, due to its proprietary small RNA separation and enrichment technology, as well as highly optimized chemistry. The Biofluids RNA kit isolates all sizes of RNA from large mRNA, viral RNA and ribosomal RNA down to small RNAs such as miRNA and siRNA. The ISOLATE II Biofluids RNA Kit is compatible with very limited, or challenging sample sources containing low RNA content.

    Agarose gel analysis of RNA samples can be both valuable and misleading. The pattern of bands on the gel can not only be indicative of the quality of the sample, but equally it can also only indicate that the gel tank, buffer or agarose is contaminated with RNase. A safer measure is to use a Bioanalyzer and look at the RIN value (RNA Integrity Number), which should be as close to 10 as possible, indicating that the RNA is not degraded. A spectrophotometer (ideally a microfluidic one) can also be used to determine the ratio of A260 to A280 for purity determination.

    All these methods give an idea of the quality of total RNA which tends to be dominated with rRNA and tRNA. It is not uncommon for an agarose gel to show an abundance of 18S and 23S rRNA but on analysis for there to be little of the transcript of interest. Ideally RNA quality control should include an assessment of the presence of common transcripts (from reference genes, such as GAPDH) using RT-PCR or RT-qPCR.

    If the yield of RNA is low, it is best to first check that all the solutions used and the equipment employed is largely free of RNase. Solutions should be prepared with the highest quality reagents available, preferably ones that have a certificate of analysis to show that they are free of DNase and RNase. If there is confidence that RNase contamination is at a minimum, then it may be worth ensuring that the sample is properly homogenised before lysis and to check a sample of the lysed material under a light microscope to ensure that all the cells are disrupted.

    RNA samples that have been contaminated with RNase (either during processing or those that have been sent from another lab) can be purified using the ISOLATE II RNA Micro Kit.


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