Ruangsomboon, Suneerat

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School of Agricultural Technology

suneerat.ru@kmitl.ac.th

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Effect of light, nutrient, cultivation time and salinity on lipid production of newly isolated strain of the green microalga, Botryococcus braunii KMITL 2
(2012-04-01)
Ruangsomboon, Suneerat
The green microalga strain, Botryococcus braunii KMITL 2, was isolated from a freshwater reservoir in central Thailand, and the effects of light, nitrogen, phosphorus, iron, cultivation time and salinity on lipid production were studied by varying parameters one at a time. When cultured in Chlorella medium containing 222mgL -1 phosphorus (PO43--P) under continuous illumination of 200μEm -2s -1 with a salinity of 0psu, a maximum lipid content of 54.69±3.13% was obtained. Its high lipid content makes strain KMITL 2 a potential source for biodiesel production in tropical regions. © 2011 Elsevier Ltd.
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Hydrocarbon production and biodiesel properties of a green microalga Botryococcus braunii KMITL 2 cultivated outdoor in open pond and closed photobioreactor
(2018-03-01)
Ruangsomboon, Suneerat
Botryococcus braunii is a promising feedstock for biodiesel production. In general, selection of the most suitable cultivation systems is based on profitable yield and oil quality. The feasibility of using this alga as feedstock for commercial biodiesel production was tested by comparing the cultivation in open pond and closed photobioreactor under the 5 g⋅kg-1 optimum salinity condition previously found, and the results were that the hydrocarbon content (40.7±1.6%) of the alga cultivated in open pond was higher than that cultivated in the photobioreactor and its biomass (2.9±0.1 g⋅L-1) was much higher; its biodiesel properties, however, were nearly identical with cetane values of 48.15-56.99. Drastically different though were the hydrocarbon yields-cultivation in the open pond produced 2.3 times higher yield than the closed photobioreactor. Hence, outdoor cultivation under optimum salinity in open pond was considered suitable for biodiesel production by this algal strain.
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Effects of different nitrogen, phosphorus, and iron concentrations and salinity on lipid production in newly isolated strain of the tropical green microalga, Scenedesmus dimorphus KMITL
(2013-06-01)
Ruangsomboon, Suneerat
;
Ganmanee, Monthon
;
Choochote, Sakchai
The fatty acid composition, the effect of different concentrations of nitrogen (16.5-344 mg L-1), phosphorus (9-45 mg L-1), iron (9-45 mg L-1) and salinity levels (0-20 psu) on lipid production in the green microalga Scenedesmus dimorphus KMITL, a new strain isolated from a tropical country, Thailand, were studied. The alga was isolated from a freshwater fish pond, and cultured in Chlorella medium by varying one parameter at a time. The main fatty acid composition of this strain was C16-C18 (97.52 %) fatty acids. A high lipid content was observed in conditions of 16.5 mg L-1-N, or 22 mg L-1-P, or 45 mg L-1-Fe, or 5 psu salinity, which accumulated lipids to 20.3 ± 0.4, 19.4 ± 0.2, 24.7 ± 0.5, and 14.3 ± 0.2 % of algal biomass, respectively. Increasing lipid content and lipid productivity was noted when the alga was cultured under high iron concentration and high salinity, as well as under reduced phosphorus conditions, whereas nitrogen limitation only resulted in an increased lipid content. © 2012 Springer Science+Business Media Dordrecht.
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Effect of media and salinity on lipid content of cyanobacterium Hapalosiphon sp
(2014-01-01)
Ruangsomboon, Suneerat
The aim of the present work was to study the individual effect of media constituents: sodium nitrate, di-potassium hydrogen orthophosphate, ferric ammonium citrate and salinity on lipid production by Hapalosiphon sp. which cultured in BG-11 medium, in view of its possible utilization as novel raw materials for biodiesel production. Lipid content of Hapalosiphon sp. cultivated in medium containing 1, 500 mg/L sodium nitrate was 15. 78±0. 51%. Indeed, the highest lipid yield of 0. 063 g/L was found in a medium containing 375 mg/L sodium nitrate. The highest lipid content of Hapalosiphon sp. cultivated in medium containing 10 mg/L di-potassium hydrogen orthophosphate was 11. 50±0. 45%, while the highest lipid yield of 0. 044 g/L were occurred in a medium containing 20 mg/L di-potassium hydrogen orthophosphate. In various ferric ammonium citrate concentrations cultivation, the highest lipid content of Hapalosiphon sp. cultivated in a medium containing 9 mg/L ferric ammonium citrate was 12. 64±0. 38%. However, the highest lipid yield of 0. 063 g/L occurred in a medium containing 12 mg/L ferric ammonium citrate. The significantly highest lipid content and lipid productivity of Hapalosiphon sp. cultivated in salinity 10 ppt were 9. 95±0. 34% and 0. 049 g/L respectively.
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Enhanced growth and hydrocarbon production of Botryococcus braunii KMITL 2 by optimum carbon dioxide concentration and concentration-dependent effects on its biochemical composition and biodiesel properties
(2017-01-01)
Ruangsomboon, Suneerat
;
Prachom, Noratat
;
Sornchai, Piyanast
The purposes of this study were to find the optimum level of supplementing CO<inf>2</inf> for increasing the biomass and hydrocarbon production of B. braunii KMITL 2 (A race) and to determine the effects of CO<inf>2</inf> level on CO<inf>2</inf> fixation and biodiesel properties. The experimental results showed that the alga supplemented with 10% CO<inf>2</inf> produced the highest biomass (1.48 ± 0.02 g L−1) and CO<inf>2</inf> fixation rate (100.43 ± 1.42 mg L−1 d−1) that were 2.7 and 5.3 times higher than the control (0.04% CO<inf>2</inf>). The gravimetric hydrocarbon content (36.82 ± 3.39%) and hydrocarbon titer (0.35 ± 0.03 g L−1) of the alga supplemented with 5% CO<inf>2</inf> were 1.6 and 2.7 times higher than the control. Cultivation of this strain under 5% CO<inf>2</inf> gave the highest hydrocarbon yield and good biodiesel properties with the lowest iodine value and a higher CN value than the ASTM D6751 and EN 14214 fuel standards.
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Effects of different media and nitrogen sources and levels on growth and lipid of green microalga Botryococcus braunii KMITL and its biodiesel properties based on fatty acid composition
(2015-06-08)
Ruangsomboon, Suneerat
This work aimed to find an optimum culture medium for green microalga Botryococcus braunii KMITL and investigate its biodiesel properties based on fatty acid composition. Four different media were tested. Chlorella medium was the best medium for lipid yield. Among four nitrogen sources tested, KNO<inf>3</inf> produced the highest lipid yield. When varied the nitrogen concentrations, this strain gave the highest lipid yield at the highest nitrogen level. When cultivated in the best medium and nitrogen source and level for 30 days, and then cultivated further for 14 days in the medium with no nitrogen, the highest lipid content and yield were 49.94 ± 0.82% and 2.71 ± 0.02 g L-1, respectively. C16:0 fatty acid was the major fatty acid found. Fatty acid profiles of B. braunii KMITL cultivated in Chlorella medium with 1.25 g L-1 KNO<inf>3</inf> gave the best biodiesel properties with the lowest iodine value, maximum cetane number, and lowest degree of unsaturation.
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Cyanobacterial composition and microcystin accumulation in catfish pond
(2014-01-01)
Ruangsomboon, Suneerat
;
Yongmanitchai, Wichien
;
Taveekijakarn, Paveena
;
Ganmanee, Monthon
Cyanobacterial blooms frequently occur in catfish ponds, but the potential effects of its secondary metabolites on cultured animals in ponds and human beings remain largely unknown. In the present study, high chlorophyll-a levels (1.28-2.06 mg/L) indicated massive phytoplankton blooms in the studied ponds, with a maximum density of 52 × 106 cells/L of potentially toxic cyanobacteria, composed mainly of Microcystis aeruginosa, Oscillatoria spp., Lyngbya sp., Pseudanabaena spp., Anabaena spp., Anabaenopsis sp., and Cylindrospermopsis sp. However, microcystins were not detected by liquid chromatography-mass spectrometry in samples of water and fish. Instead, microcystin-RR in phytoplankton was estimated to be between 0.014 and 0.202, and correlated positively with the density of Anabaena spp. (r=0.33, p<0.05), alkalinity (r=0.37, p<0.05), and ammonia (r=0.48, p<0.01). Microcystin was not detected in the fish in this study, but microcystin accumulation was found in 43% of analyzed phytoplankton samples. Therefore, long-term monitoring is recommended in order to fully understand microcystin accumulation patterns at all degrees of phytoplankton bloom.
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Effects of low pH and Pb2+ stress on living cyanobacterium, Phormidium angustissimum West & G.S.West: A test of its feasibility as a living biosorbent
(2013-06-01)
Ruangsomboon, Suneerat
;
Wongrat, Ladda
;
Choochote, Sakchai
;
Ganmanee, Monthon
;
Saparnklang, Atiya
Pb2+ adsorption by the living cyanobacterium, Phormidium angustissimum followed the Langmuir adsorption model, with the maximum adsorption capacity (q <inf>max</inf>) of 295.4 ± 13.8 mg g-1. This result suggests that P. angustissimum is a promising living biosorbent to remove Pb2+ from wastewaters. Living biosorbents are better able to remove Pb2+ from wastewater than dead biosorbents, however there are practical limitations for their use are encountered in extreme conditions such as low pH and high Pb2+ concentration. The feasibility of using cyanobacterium, P. angustissimum, as a living biosorbent for the extraction of Pb2+ from wastewater was studied by investigating its photosynthestic performance and tolerance under Pb2+ (0-5 mg L-1) contamination and low pH (pH 3-7). Decreased photosynthetic performance caused by Pb2+ contamination and low pH stress was detected in this study by means of a reduction of the maximum photochemical efficiency of PSII (F<inf>v</inf>/F<inf>m</inf>). Detoxification mechanisms of P. angustissimum on Pb2+ appeared to increase its intracellular polysaccharides (IPS), exocellular polysaccharides (EPS), and protein. Living P. angustissimum could increase the pH of the solution which resulted in Pb2+ precipitation. The unique ability of P. angustissimum to remove Pb2+ and to grow under toxic conditions, demonstrated herein, indicates that it is a promising living biosorbent for mildly acidic water contaminated with Pb2+ in bioremoval systems in the which pH is not lower than 5 and Pb2+ is not higher than 5 mg L-1. © 2013 Springer Science+Business Media Dordrecht.
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Enhanced hydrocarbon production and improved biodiesel qualities of Botryococcus braunii KMITL 5 by vitamins thiamine, biotin and cobalamin supplementation
(2018-01-01)
Ruangsomboon, Suneerat
;
Sornchai, Piyanuch
;
Prachom, Noratat
Botryococcus braunii, a green microalga which is a potentially good biodiesel feedstock, was isolated from a freshwater fish pond in Bangkok, and the effects of B-vitamins—thiamine, biotin and cobalamin as well as their mixes—on its biomass, hydrocarbon production, carbohydrate content and biodiesel properties were investigated, using a control group that was not supplemented with any vitamins. The addition of thiamine increased the alga's biomass and hydrocarbon content, whereas addition of biotin, cobalamin and mixes of all three vitamins did not increase its hydrocarbon content. Among the vitamins tested, thiamine 150 μg L− 1 was the best for producing high biomass (2.08 ± 0.07 g L− 1), hydrocarbon content (37.29 ± 0.41%), hydrocarbon yield (0.77 ± 0.03 g L− 1) and hydrocarbon productivity (90.32 ± 3.05 mg L− 1 d− 1). Maximum carbohydrate content (386 ± 39 mg g− 1) was achieved by addition of 1 μg L− 1 cobalamin. Compared to the control group, the alga cultured in media supplemented with 100 μg L− 1 thiamine showed better biodiesel properties with lower iodine value (76.42 g I<inf>2</inf> 100 g− 1), cold filter plugging point (9.90 °C) and higher cetane number (54.30). Therefore, thiamine was shown to be a promising culture medium supplement for this strain for using it as a feedstock for biodiesel production. An investigation of vitamin B-related gene in B. braunii KMITL 5 found related genes for thiamine (thi), biotin (bioB and bioF) and cobalamin (metE and metH) vitamins, which are marks of vitamin autotrophy in algae.
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Enhanced production of polysaccharides and protein content in cyanobacterium, Oscillatoria limnetica as a defense mechanism against low pH and Pb2+
(2015-01-01)
Ruangsomboon, Suneerat
Living biomass has better ability to remove Pb2+from wastewaters as compare to dead biomass. But, living biomass also have some practical limitations, such as, they are not efficient at low pH, and at high concentrations of metal ions. In the present study living biomass of Os cilia tori a Uni tie tic a was assessed for its metal sorption capacity. O. Bmnetica considerably sorbed a laige amount of Pb2+within pH range 3-7. The maximum Pb2+sorption capacity of 0. Unmetica was 434.78 mg/g. As photochemical efficiency data depicted, Pb2+exerted inhibitory effects on photosynthesis of the test cyanobacterium. However, the test cyanobacterium showed considerable tolerance to Pb2+exposure as concentration increased from 0 to 5 mg /L. Defense mechanisms of 0. Bmnetica under Pb2+enriched condition is probably associated with greater accumulation of intracellular polysaccharides (IPS) and protein. Nonetheless, since Pb2+binding capacity of 0. limnetica is significantly high than that of several other biosorbents, it can be considered as a promising biomaterial for removal of Pb2+from wastewaters.

Ruangsomboon, Suneerat

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