Indonesia has many types of plants that have the potential to be used as natural antioxidants. This study aims to characterize natural sources of antioxidants from five plants species: jackfruit leaves, turmeric, black tea, soursop peels, and aloe vera. The method used involved an analysis of phytochemicals in the form of polyphenols, tannins, and flavonoids. As well as analysis of antioxidant activity using the DPPH method. The data obtained were analyzed by ANOVA (Analysis of Variance) and Duncan’s test. Based on these data, the highest yields were found in jackfruit leaves, turmeric, black tea, and aloe vera (P<0.05), while the lowest yields were found in soursop peels. Based on phytochemical data, the highest total phenol was found in jackfruit leaves and soursop skin (P<0.05). While the highest flavonoid content was found in black tea and aloe vera (P<0.05), and the highest tannin content was found in black tea and soursop skin. Based on the method of measuring antioxidant activity, it was found that jackfruit leaves and black tea had the highest antioxidant activity.

https://iopscience.iop.org/article/10.1088/1755-1315/1182/1/012083/pdf

Screening of antioxidant activities and their bioavailability of tropical plants

Pre-Harvest Technologies; Floriculture Sustainability Initiative

Tea (Camellia sinensis L.) is amongst the most popular beverages around the globe. Tea contains polyphenols and flavonoids, which have huge health significance. Hence, polyphenols and flavonoids can be considered as good indicator for tea quality. In the present investigation four different tea varieties i.e., Nilgiri, Darjeeling, Assam and Munnar were analyzed for their moisture content, water activity, total phenol content and total flavonoid content using UV-visible spectrophotometer. The total amounts of phenol content and total flavonoids were determined by Folin-Ciocalteu and Aluminium chloride method respectively. The total phenol was obtained as in the range of 20.76 ± 0.010 to 25.97 ± 0.027 mg gallic acid equivalent (GAE)/g of dry weight and flavonoids were expressed between 45±0.012 to 53.84±0.017 mg/g of catechin equivalents (mg/g of Catechin of extracted compound) for the sample taken. Nilgiri and Assam tea infusion were determined to have the highest phenol and total flavonoid contents i.e., 25.97 ppm and 53.84 ppm respectively. 

/pdf/physical-and-antioxidant-properties-of-selected-tea-1yyh74xl.pdf

Physical and antioxidant properties of selected tea varieties

Virgin coconut oil (VCO) being one of the costly oils is prone to be adulterated with cheaper oils viz ., coconut oil (CO). Attempt were made to develop a new innovative way to detect the adulteration in VCO using Localized surface plasmon resonance (LSPR) system. Optimization of certain process parameters is an prioritize criteria for detection by LSPR system for further development of the calibration curve. The traditional method for optimization involved the study of one variable at a time, which in turn required a large number of experimental runs. The Design of experiments (D.O.E) by Taguchi design employed here for optimization of LSPR system to achieve maximum reliability with a minimum experimental run. The process parameters viz ., flowrate, surfactant and pH were selected for the optimization of the LSPR system to detect the VCO adulteration with CO in PBS buffer. For obtaining a maximum response a large signal to noise ratio was applied. An optimal condition for LSPR system was obtained at a Flowrate (200µl/min), pH (7.0) and surfactant (Tween 20) with a significant difference ( p <0.05). A linear regression model with high significancy was developed and the model was validated. The results suggested that the Taguchi method can be used as an effective optimization method for LSPR system for VCO adulteration detection by further development of the calibration curves.

Design of experiment (D.O.E) by Taguchi model for optimization of different process parameters for LSPR system to detect VCO adulteration

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Physical and antioxidant properties of selected tea varieties

Design of experiment (D.O.E) by Taguchi model for optimization of different process parameters for LSPR system to detect VCO adulteration