A simple optical pH sensor using the active compound anthocyanin (ACN), derived Ruellia tuberosa L. flower immobilized in a pectin membrane matrix, was been fabricated and employed to monitor the freshness of tilapia fish at room temperature and 4oC storage. The optimum pectin weight and ACN concentrations were 0.1% and 0.025 mg/L. The sensor showed good sensitivity at 0.03 M phosphate buffer solution. The sensor’s reproducibility was evaluated using 10 replicate sensors where a standard deviation of 0.045 or relative standard deviation of 9.15 was achieved. The sensor displayed an excellent response after 10 minutes of exposure, possessing a response stability for 10 consecutive days. The decrease in pH value of the Tilapia fish from 7.3 to 5 was observed in a 48 hour test, which can be used as the parameter when monitoring fish freshness.
In plants, a group of non-coding small RNA (sRNA) has been provento be an important player in regulating gene expression that can govern network of genetic systems. The two major classes of sRNA which are very extensively studied through deep sequencing, microRNA (miRNA) and small-interfering RNA (siRNA) classes, are well documented. However, the isolation method of sRNA differs depending on the type of sample. Here, we demonstrate the miRNA library preparation using two different Small RNA Library preparation kit, Illumina®TruSeq® Small RNA Preparation and NEBNext® Multiplex Small RNA Library Preparation kit on a plant rich in secondary metabolite Persicaria minor using recommended protocol. The result show NEBNext® Multiplex Small RNA Library Preparation kit can recover small RNA better than Illumina®TruSeq® Small RNA Preparation kit. Thus, this study recommended NEBNext® Multiplex Small RNA Library Preparation kit for miRNA library preparation on Persicaria minor.
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