Antioxidant Activities of Eucheuma sp. (Rhodophyceae) and Laminaria sp. (Phaeophyceae)

Abstract

In this study, antioxidant activities of two macroalgae, Eucheuma sp. J.Agardh and Laminaria sp., J.V.Lamouroux used as food supplements were investigated. The antioxidant activity, free radical scavenging activity, the total content of phenolics, flavonoids and condensed tannins in extracts were determined. The IC50 values of the extracts of Eucheuma sp. and Laminaria sp. on DPPH scavenging activity was 2.26±0.03 mg/g and 2.63±0.03 mg/g of extract, respectively. The maximum total phenolic (5.31±0.04 mg GAE/g Ext.) were determined. According to our results, all extracts exhibited low radical scavenging activity when compared to the standards used, i.e. -tocopherol and butylated hydroxytoluene (BHT) with the inhibition percentage in the range of 48.45±0.06% (Eucheuma sp.) – 58.49±0.03% (Laminaria sp.). The highest flavonoid content was measured as 18.78±0.10 mg rutin/g of extract in Laminaria sp. The condensed tannins were not detected in Eucheuma sp. However, this value was measured as 6.24±0.60 mg CE/g of extract for Laminaria sp. According to our results, Eucheuma sp. and Laminaria sp., which are commercially sold in medicinal herb stores, are good sources of antioxidant components because of their phenolic and flavonoid contents.

ANTIOXIDANT AND ANTI-INFLAMMATORY ACTIVITIES FROM ETHANOL EXTRACT OF Eucheuma cottonii FROM LEMUKUTAN ISLAND WATERS WEST KALIMANTAN

“…Antioxidant activity in macroalgae is closely associated with the content of total phenolic compounds (Fernando et al, 2018;Ak and Türker, 2019;Arunkumar et al, 2020). It is in accordance with previous studies that phenolic is presently dominantly in macroalga and this compound extracts exhibited a wide range of biological activities, including antiinflammatory activity (Catarino et al, 2017;Neto et al, 2018) and as the most antioxidant potential source (Cox et al, 2010;Machu et al, 2015).…”

“…In addition, this species is able to synthesize significant amount of bioactive compounds which are potential to be developed. Previous studies have reported the valuable constituents of E. cottonii with a wide range of biological activities, such as antidiabetic (Prasasty et al, 2019), antibacterial (Bhuyar et al, 2020;Sukmawati, 2021), antioxidant to protect various diseases and stress (Muawanah et al, 2016;Yanuarti et al, 2017;Wulandari et al, 2018;Bangngalino and Badai, 2018;Sambodo, 2019;Ak and Türker, 2019). Moreover, macroalgae with phlorotannin content have been discovered to possess anti-inflammatory properties (Brown et al, 2014;Sudirman et al, 2018;Gutiérrez-Rodríguez et al, 2018).…”

The Effect of Different Solvents on Antioxidant Properties of Gongolaria barbata (Phaeophyceae)

“…Our results showed a negative correlation between DPPH scavenging activities and both flavonoids and phenolic values. In previous studies, the total phenolic and flavonoid were significantly correlated to IC50 inhibition values, and results show significant negative relationships (Ismail, 2017;Ak and Türker, 2019).…”

“…Flavonoids are polyphenolic compounds and are known as safe and non-toxic antioxidants. Seaweeds' phenolic and flavonoid compounds change according to species, environmental conditions, and extraction solvents (Ak and Türker, 2019;Koru et al, 2021).…”

Determination of Yield and Quality Parameters in Pickling Hot Peppers Grown under Different Water Stress Conditions

“…The antioxidant activity was determined using the DPPH (2,2-diphenyl-1-picrylhydrazyl) free radical scavenging method as described by Brand-Williams et al (1995) and Ak and Türker (2018). Different concentrations of methanol-diluted pepper extracts were mixed with DPPH solution after being allowed to stand at room temperature for 30 minutes.…”