Potential to resist biological contamination in marine microalgae culture: Effect of extracellular substances of Nannochloropsis oceanica on population growth of Euplotes vannus and other protozoa

The production of high-value bioproducts from microalgae biomass has been widely investigated. However, their production is hindered by the expensive harvesting process. To date, flocculation followed by DAF process has been accepted as one of the affordable harvesting approaches. In this study, the use of DAF technique was attempted to harvest marine microalgae Nannochloropsis sp. Batch DAF harvesting was carried out using fabricated DAF unit equipped with several compartments including separation column, product collecting vessel and rotary skimmer. Tannin-based biopolymer flocculant, AFlok-BP1 at pH 5 with a concentration of 160 mg/L was used to facilitate the flocculation of particles. The effects of different saturator pressure at 1.8, 2, and 2.2 bar were then evaluated at a constant volume of 6 L microalgae culture. The effects of different microalgae culture volumes (6, 8 and 10 L) were also evaluated at a fixed saturator pressure of 2.2 bar. The highest pressure at 2.2 bar yielded the best result with the highest total solid of 3.19 ± 0.01% and a maximum yield of 1.70 ± 0.05 g/g (wet basis). The microalgae concentration was the lowest (0.027 g/L) when 6 L of culture volume was used. However, the values were significantly higher when the culture volume was increased to 8 and 10 L to approximately 0.035 and 0.050 g/L, respectively. As a conclusion, the study provided evidence for the feasibility of DAF technique in harvesting marine microalgae Nannochloropsis sp.

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FATTY ACID ANALYSIS OF MARINE MICROALGAE Chlorella Sp. IN MODIFIED MEDIUM USED GAS CRHOMATOGRAPHY-MASS SPECTROMETRY (GC-MS)

Journal of Pharmacopolium ◽

10.36465/jop.v1i1.389 ◽

2018 ◽

Vol 1 (1) ◽

Cited By ~ 1

Author(s):

Dewi Kurnia

Keyword(s):

Fatty Acids ◽

Fatty Acid ◽

Raw Materials ◽

Chemical Compounds ◽

Fatty Acid Analysis ◽

Marine Microalgae ◽

High Cholesterol ◽

Chlorella Sp ◽

Microalgae Culture ◽

Dry Biomass

Microalgae is known as a raw materials of pharmaceutical industry, it contains various chemical compounds such as protein, fatty acid, pigments and vitamins. The compound can be use as a basic ingredient of pharmaceutical also can be use as a treatment or prevention agent such as cancer and high cholesterol. Chlorella sp. is a green microalgae which can be found in Indonesia marine area, it also has a high enough of lipid. Compotition of fatty acid from marine microalgae Chlorella sp that cultivated with modification medium has been analyzed. Microalgae culture cultivated with GM 10% as a medium for 8 days. 51,55 L culture produced a 31,0537 gr dry biomass. 31,0537 gr dry biomass Soxhletation produced about 12,8818% w/w oil rendemen. The results of GC-MS analysis, there are 3 types of fatty acids identified in microalgae Chlorella Sp. The composition are palmitic acid (13,34%), linoleic acid (5,39%) and oleic acid (16,40%). Total fatty acid contained is 35,13% Keywords:Chlorella sp, fatty acids, GC-MS.

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