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Research articles

ScienceAsia 43 (2017): 88-95 |doi: 10.2306/scienceasia1513-1874.2017.43.088

Antibacterial and antioxidant activities of differential solvent extractions from the green seaweed Ulva˙intestinalis

Watee˙Srikonga, Nuttapong˙Bovornreungrojb, Pimonsri˙Mittraparparthorna, Preeyanuch˙Bovornreungroja,*

ABSTRACT:     The green algae (Enteromorpha spp.) is widely distributed in the southern coast of Thailand. Antibacterial, total phenolic, and antioxidant activities of crude extracts from Ulva intestinalis (E.˙intestinalis) with differential solvent extractions were investigated. Alga extracts were prepared by maceration with methanol, ethanol, dichloromethane, and hexane. Only the hexane extract had significant antibacterial activities for Gram-positive bacteria but not Gram-negative bacteria. The lowest minimal inhibitory concentrations of the hexane extract against Bacillus cereus TISTR 687, Staphylococcus aureus ATCC 29213, and methicillin- resistant Staphylococcus aureus 001 R (MRSA) were 256˙µg/ml. Pore formation was observed on the cell surface of B.˙cereus treated with the hexane extract. Among these extracts, the highest inhibition radical scavenging effects on 2,2-diphenyl- 2- picrylhydrazyl (DPPH) and 2,2′-azino- bis(3- ethylbenzothiazoline- 6- sulphonic acid) (ABTS) activities were observed in the dichloromethane extract with IC50=0.92˙mg/ml and 1.50˙mg/ml, respectively. The highest phenolic content index was observed with the dichloromethane extract as 197±16˙mg gallic acid equivalents/g extract and was significantly higher than those of other extracts (p<0.05). The results indicated that this edible seaweed possesses bioactive compounds that could be further explored for future applications in medicine, dietary supplements, cosmetics, and food industries.

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a Department˙of˙Microbiology, Faculty˙of˙Science, Prince˙of˙Songkla˙University, Hat˙Yai, Songkhla˙90110˙Thailand
b Department˙of˙Technology˙and˙Industry, Faculty˙of˙Science˙and˙Technology, Prince˙of˙Songkla˙University, Muang, Pattani˙94000˙Thailand

* Corresponding author, E-mail: preeyanuch.b@psu.ac.th

Received 12 Jan 2016, Accepted 27 Jun 2017