Research on ulvan and pigments from Ulva reticulata aims to obtain, purify, and evaluate the bioactive potential of its sulfated polysaccharides (ulvan) along with natural pigments such as chlorophyll and carotenoids. The study involves sample preparation, extraction, and separation of ulvan and pigments, followed by chemical characterization and biological activity assessments, such as antioxidant or antimicrobial tests. The outcomes are expected to provide scientific insight into the potential of Ulva reticulata as a valuable source of natural bioactive compounds for applications in health, pharmaceutical, and nutraceutical industries.
Research on the phycoerythrin pigment from red algae aims to obtain, purify, and evaluate the antioxidant potential of this natural pigment. The research stages include sample preparation, extraction using an appropriate buffer or solvent system, separation and purification of phycoerythrin through processes such as precipitation or chromatography, and spectral characterization to confirm pigment purity. Furthermore, the antioxidant activity of phycoerythrin is assessed using bioactivity assays such as DPPH, ABTS, or FRAP. The results of this study are expected to provide scientific information regarding the potential of phycoerythrin as a stable natural pigment and a valuable antioxidant compound for applications in food, cosmetics, pharmaceuticals, and other biotechnological industries.
 
The study on the effectiveness of brown algae Padina australis extract aims to obtain, identify, and evaluate the bioactive potential of its active compounds, particularly as natural antibacterial and antioxidant agents. The research stages include the extraction process using solvents with different polarity levels (n-hexane, chloroform, and methanol), antibacterial activity testing against pathogenic bacteria, and antioxidant activity analysis through free radical scavenging assays. In addition, the detection of bioactive compound groups was carried out using phytochemical screening and Thin Layer Chromatography (TLC) to determine the dominant secondary metabolite profiles. The results of this study are expected to provide scientific information regarding the potential of Padina australis as a natural source of bioactive compounds, which play an important role in the development of antibacterial and antioxidant materials for applications in health, pharmaceutical, and marine biotechnology fields.
This study aims to evaluate the potential of Spirulina platensis as a natural antibacterial agent against pathogenic bacteria Staphylococcus aureus and Escherichia coli. Rich in phycocyanin, flavonoids, proteins, and other bioactive compounds, this microalga exhibits notable antibacterial activity. Growth and inhibition assays using spirulina extracts demonstrated its ability to suppress both Gram-positive and Gram-negative bacteria, highlighting S. platensis as a promising, safe, and sustainable alternative to synthetic antibiotics.
 
This study aims to investigate the effect of different pH levels on the growth, fatty acid composition, antioxidant activity, antibacterial potential, and natural pigment content of Spirulina platensis. The culture was first rejuvenated from cold-stored stock and then inoculated into growth media with varying pH levels, followed by cultivation until reaching the optimum growth phase.
The culture was subsequently scaled up gradually, from laboratory scale to larger containers of 3 liters and 10 liters, to obtain sufficient dry biomass for further analyses. The biomass was harvested using a fine-mesh phytoplankton net to minimize cell loss, frozen, and then dried using a freeze dryer for 24 hours. The resulting dry biomass was used for analyses of fatty acid composition, antioxidant and antibacterial activities, and phycocyanin pigment content.
This research is expected to provide scientific insight into the influence of pH on biomass quality and bioactivity of Spirulina platensis, as well as to support its potential utilization as a natural source of functional food, pharmaceutical, and nutraceutical compounds.
