Determination of antioxidant activity of gum arabic: An exudation from two different locations

Abstract

Gum arabic (GA) is the main product of acacia trees. As a raw and commercial samples, GA was extracted with methanol and analysed to measure the antioxidant activity using five methods: 2,2-diphenyl-1-picrylhydrazyl (DPPH), Folin-Ciocalteu indexes (FCI), which indicate total phenolic compounds (TPC), oxygen radical absorbance capacity (ORAC), ferric reducing antioxidant power (FRAP), and cupric reducing antioxidant capacity (CUPRAC). This study used antioxidant assays to detect TPC and selected appropriate and inexpensive methods to determine the antioxidant capacity of GA samples. The results reveal that the FCI, ORAC, and CUPRAC are correlated highly with FRAP. Person's correlation coefficient (r) values are 0.98, 0.93, and 0.99, respectively, based on the sample size of (n = 8). This means that the TPC of GA is highly correlated with their antioxidant activities that are measured by these three methods. Hence the FCI, ORAC, and the CUPRAC methods are more effective and simpler. They had similar predictive power to the FRAP of GA antioxidant activity. Consequently, GA is generally recognized as being slightly acidic which may have been obtained from appropriate methods of the antioxidant capacity detection. This acidity is due to the electronic transfer mechanism based on the selection of the working pH.

Stability of encapsulated and non-encapsulated anthocyanin in yogurt produced with natural dye obtained from Solanum melongena L. Bark

“…The increase in the antioxidant activity can also be related to the use of encapsulating material, since gum arabic also has the capacity of reducing free radicals. However, according to Mirghani et al (2018), the antioxidant activity of gum arabic with DPPH was the one with the lowest result. Bernstein and Noreña (2015) reported that the antioxidant activity of red cabbage extract in acidified water was approximately 34.6% and, in dehydrated products, it decreased to values between 14 and 22.5%, highlighting that this decrease was a consequence of high air temperatures at the atomizer outlet, which caused the degradation of compounds responsible for the antioxidant activity.…”

Comparative Study on Antioxidant Activities, Total Phenolic Compound and Pigment Contents of Tropical Spirulina platensis, Gracilaria arcuata and Ulva lactuca Extracted in Different Solvents Polarity

“…In this research, antioxidant activity of GAE was better than of G. verrucosa from Pok Tunggal water (IC50= 188.53 ppm) [13], while antioxidant activity of ULE was still relatively low compared by U. lactuca extract [43] that have strong antioxidant activity (IC50= 60.975 ppm). The different result occurs because the antioxidant activity are varied, depends on the species of seaweed [44], location [45] and seasons [14], respectively. Antioxidant compound act as a hydrogen atom donor [46].…”

Antioxidant Activities, Total Phenolic Compound And Pigment Contents of Tropical Sargassum sp. Extract, Macerated In Different Solvents Polarity

“…In this present research, The IC50 value was slightly higher (72.95 ±0.22 ppm) than Sedjati et al (2018) (69,274 ppm) and lower than Hidayati et al (2017) (99.166 ppm). The different result occurs because the antioxidant activity are varied, depends on the species of seaweed (Parthiban et al, 2014), location (Mirghani et al, 2018) and seasons (Khairy and El-Sheikh, 2015), respectively. The low IC50 value indicates a strong antioxidant activity.…”