Comparative Study on the Effect of Phenolics and Their Antioxidant Potential of Freeze-Dried Australian Beach-Cast Seaweed Species upon Different Extraction Methodologies.
Vigasini SubbiahFaezeh EbrahimiOsman Tuncay AgarFrank Rowland DunsheaColin James BarrowHafiz Ansar Rasul SuleriaPublished in: Pharmaceuticals (Basel, Switzerland) (2023)
Brown seaweed is rich in phenolic compounds and has established health benefits. However, the phenolics present in Australian beach-cast seaweed are still unclear. This study investigated the effect of ultrasonication and conventional methodologies using four different solvents on free and bound phenolics of freeze-dried brown seaweed species obtained from the southeast Australian shoreline. The phenolic content and their antioxidant potential were determined using in vitro assays followed by identification and characterization by LC-ESI-QTOF-MS/MS and quantified by HPLC-PDA. The Cystophora sp. displayed high total phenolic content (TPC) and phlorotannin content (FDA) when extracted using 70% ethanol (ultrasonication method). Cystophora sp., also exhibited strong antioxidant potential in various assays, such as DPPH, ABTS, and FRAP in 70% acetone through ultrasonication. TAC is highly correlated to FRAP, ABTS, and RPA ( p < 0.05) in both extraction methodologies. LC-ESI-QTOF-MS/MS analysis identified 94 and 104 compounds in ultrasound and conventional methodologies, respectively. HPLC-PDA quantification showed phenolic acids to be higher for samples extracted using the ultrasonication methodology. Our findings could facilitate the development of nutraceuticals, pharmaceuticals, and functional foods from beach-cast seaweed.
Keyphrases
- ms ms
- liquid chromatography tandem mass spectrometry
- oxidative stress
- anti inflammatory
- human health
- simultaneous determination
- high throughput
- public health
- healthcare
- high performance liquid chromatography
- ultra high performance liquid chromatography
- computed tomography
- mass spectrometry
- liquid chromatography
- tandem mass spectrometry
- single cell
- single molecule
- contrast enhanced ultrasound