Preparation and Characterization of Agar Polysaccharide from Red Alga Phycocalidia Vietnamensis (Bangiales)
Abstract
In this research, biomass of the red algae Phycocalidia vietnamensis (Bangiales) was investigated for agar production. Agar was prepared by the hot water extraction method with 0, 4, 6, 8, 10% (w/v) NaOH pre-treatments. Samples without NaOH pre-treatment did not form gel. The agar yield of the NaOH pre-treated samples ranged from 7.13 to 12.42% dry weights. The highest gel strength of 596? ?35 g/cm2 was recorded for agar treated with 10% NaOH, followed by 350? ?17 g/cm2 with 8% and 150? ?23 g/cm2 with 6%. In addition, the extracted agar was tested for bacteriological application, and total bacterial counts ranged from 1.2? ?103 to 2.4? ?103 CFU mL??1. This study suggests that the agar extracted with 10% NaOH pre-treatment is suitable for bacteriological applications, while agar obtained with 6% and 8% NaoH pre-treatment could be used in the food industry.
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