experiment conducted by Islam et al. (2017), the tests for polyphenols used different techniques like the procedures compiled by Benchonnouf et al. (2017). Due to the multiple categories created for testing, Islam et al. (2017) used various types of chemicals and reagents like Benchonnouf et al. (2017). Despite these similarities in the methodologies, the researchers used different guidelines for making conclusions. For instance, the experiment conducted by Benchennouf et al. (2017) majored on the polyphenolic contents of Lycium barbarum cultivated in Greece so that the findings could be used to encourage consumption of the fruits. On the other hand, the experiment of Islam et al. (2017) focused on the polyphenolic contents of black and goji berries in a bid to identify the sample with higher concentration. Islam et al. (2017) used Folin-Ciocalteu reagent which was common in these all experiments alongside other reagents like potassium persulphate, sodium acetate, aluminium chloride hexahydrate, phosphate buffer saline, and methanol. The procedure involved using ground goji berry mixed with a solvent and placed in a centrifuge. The researchers also applied the colorimetric method with UV-spectrophotometer at 765nm to determine total phenolic contents as well as the concentration of flavonoid content, condensed tannin, and monomeric anthocyanin. The composition under each phenolic test was expressed as an equivalent of gallic acid in the range between 50 to 1000µg/ml and represented in a standard calibration curve. Therefore, this procedure reveals significant differences when compared to the experiment conducted in this project or the methodology