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Microorganisms and their fermentative activities have had a distinctive role in human being as old as civilization (Erten et al., 2014;Mith et al., 2014). A broad variety of foods and beverages have been produced by fermentative activities of microorganisms, which finally led to desirable biochemical changes in different foods (Blandino et al., 2003;Ferreira et al., 2000). Decreasing the volume of material to be transported, increasing the nutritive value, degrading undesirable component, reducing the cooking time, energy consumption, and making safer products are other benefits of fermentation ac-

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The second main reason of Cancer mortality all around the world is Gastric cancer. One of the circulatory oncogenic microRNAs which has an overexpression in diverse malignancies, specifically in Gastric cancer, is MicroRNA-106a.In this paper novel supersensitive electrochemical biosensor for the microRNA-106a detection was studied using a duplex-specific nuclease-assisted target recycling incorporated with enzymatic signal amplification, and Fe 3 O 4 nanoparticles. Specific and selective microRNA-106a detection with a low limit of detection (0.8 fM) over a vast concentration range from 1 fM to 5 μM has been achieved using the biosensor. Meantime, the biosensor has dedicated high discrimination of analogue microRNA because of intrinsic selectivity of the term hairpin capture probe. Analyzing microRNA-106a in human serum affirmed the high possibility of the mentioned method for clinical detection of microRNA-106a and its optimistic potential in biomedical investigation.

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