Ilknur Ak | Canakkale Onsekiz Mart University (original) (raw)

Papers by Ilknur Ak

Aquaculture International, 2020

Turkish Journal of Agriculture - Food Science and Technology, 2019

This study reports on the evaluation of the antioxidant of ethanolic extracts of Mytilus gallopro... more This study reports on the evaluation of the antioxidant of ethanolic extracts of Mytilus galloprovincialis and Ruditapes philippinarum collected from the Marmara Sea. The antioxidant activity of the two bivalve species was evaluated using the 2,2-diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging method. The total carotenoid contents were also determined. In the DPPH method, all extracts exhibited low radical scavenging activity when compared to the standards used, i.e. -tocopherol and butylated hydroxytoluene (BHT) with the inhibition percentage in the range of 35.87±0.05 – 36.27±0.02%. In particular, M. galloprovincialis exhibited the highest radical scavenging activity with an IC50 value of 29.55±0.02 mg/g Ext. However, there are no statistically significant differences in the IC50 values of two species. The highest total carotenoid content was found in M. galloprovincialis as 1.13±0.02 µg/g sample. The statistically significant differences were found in total carotenoi...

New knowledge Journal of science, 2018

In this study, aqueous extracts of five seaweeds collected from Canakkale, Turkey were studied fo... more In this study, aqueous extracts of five seaweeds collected from Canakkale, Turkey were studied for free radical scavenging activity and phenolic compounds. The extracts of two brown algae ( Cystoseira barbata, Scytosiphon lomentaria ), two green algae ( Ulva rigida , Enteromorpha intestinalis ) and one red algae ( Gigartina acicularis ) were prepared with boiling. The extract of S. lomentaria demonstrated greater antioxidant potential with a low IC50 (2,67 mg/g Ext.). It was also determined that the free radical scavenging activity of other seaweed extracts were close to this value. The total phenolics, flavonoids and carotenoids of the aqueous extracts ranged from 0,10 ( G. acicularis ) to 0,66 ( C. barbata ) mg/g Ext., 1,15 ( S. lomentaria ) to 1,30 ( E. intestinalis ) mg/g Ext. and 414,2 ( U. rigida ) to 2194,5 µg/g Ext. ( C. barbata ) mg/g, respectively. It was determined that seaweeds collected from Canakkale exhibited high free radical scavenging capacity. We also found that, ...

Petalonia fascia, a brown alga, was used as a biosorbent to remove methylene blue (MB) from aqueo... more Petalonia fascia, a brown alga, was used as a biosorbent to remove methylene blue (MB) from aqueous solutions. In this study, pH, contact time and initial metal concentration of MB were studied. Langmuir and Freundlich isotherm models were also investigated. The optimum pH value was 7 and the adsorption reached equilibrium at 50 min. According to Langmuir’s model data, the maximum adsorption capacity (q ) was 28.50 mgg . Results showed that Petalonia fascia was effectively used as an alternative low cost biosorbent to remove MB from aqueous solutions. <\/div>

Turkish Journal of Agriculture - Food Science and Technology, 2019

In this study, antioxidant activities of two macroalgae, Eucheuma sp. J.Agardh and Laminaria sp.,... more In this study, antioxidant activities of two macroalgae, Eucheuma sp. J.Agardh and Laminaria sp., J.V.Lamouroux used as food supplements were investigated. The antioxidant activity, free radical scavenging activity, the total content of phenolics, flavonoids and condensed tannins in extracts were determined. The IC50 values of the extracts of Eucheuma sp. and Laminaria sp. on DPPH scavenging activity was 2.26±0.03 mg/g and 2.63±0.03 mg/g of extract, respectively. The maximum total phenolic (5.31±0.04 mg GAE/g Ext.) were determined. According to our results, all extracts exhibited low radical scavenging activity when compared to the standards used, i.e. -tocopherol and butylated hydroxytoluene (BHT) with the inhibition percentage in the range of 48.45±0.06% (Eucheuma sp.) – 58.49±0.03% (Laminaria sp.). The highest flavonoid content was measured as 18.78±0.10 mg rutin/g of extract in Laminaria sp. The condensed tannins were not detected in Eucheuma sp. However, this value was measure...

Turkish Journal of Agriculture - Food Science and Technology, 2019

In this study, the antioxidant activities and biochemical characteristics of Ulva rigida (Ulvophy... more In this study, the antioxidant activities and biochemical characteristics of Ulva rigida (Ulvophyceae) and Arthrospira platensis (Cyanophyceae) were determined. The extracts from two seaweed species were evaluated for their free radical scavenging activity, using the 1,1-diphenyl-2-picrylhydrazyl hydrate (DPPH) method, their total phenolic, flavonoid, and condensed tannin contents, through Folin–Ciocalteu, Quettier-Deleu, and Price methods, respectively. The extracts of two seaweeds showed a low free radical scavenging capacity in comparison with commercial antioxidant BHT (butylated hydroxytoluene), and vitamin C. The extract of U. rigida demonstrated greater antioxidant potential with a low IC50 (3.76±0.02 mg/g Ext.). The total phenolic contents were ranged from 2.21±0.08 (U. rigida) to 8.59±0.62 (A. platensis) mg GAE/g of extract. The highest flavonoid content was found in A. platensis as 22.70±0.65 mg rutin/g of extract. The contents of condensed tannin were measured 3.01±0.11 m...

Agricultural Science and Technology, 2018

. This study was conducted to determine antioxidant properties and phytochemicals of brown algae ... more . This study was conducted to determine antioxidant properties and phytochemicals of brown algae Scytosiphon lomentaria (Lyngbye) Link, Cystoseira barbata (Stackhouse) C. Agardh, and Padina pavonica (Linnaeus) Thivy, collected from the Dardanelles (Çanakkale) Strait, Turkey, in February 2018. The antioxidant activity, total carotenoids, condensed tannins, and total content of phenolics and flavonoids in ethanol extracts were quantified. P. pavonica showed the highest antioxidant potential as well as the maximum content of phenolics and carotenoids. The total flavonoid contents changed from 1375.43±2.37 µg/g Ext. (C. barbata) to 2250.92±46.60 µg/g Ext. (S. lomentaria). The highest condensed tannins were found in C. barbata. According to results obtained, C. barbata, S. lomentaria and P. pavonica possess antioxidant activity and could be used in the food and feed industries.

Fresenius Environmental Bulletin

In this study, the effect of an agricultural organic fertilizer on growth, pigment, proximate and... more In this study, the effect of an agricultural organic fertilizer on growth, pigment, proximate and agar content of Gracilaria verrucosa (Hudson) Papenfuss was studied. The highest daily growth rate was determined in the agricultural organic fertilizer group as 4.0 % day -1. Therefore, the growth of G. verrucosa with agricultural organic fertilizer and Conway's medium showed no significant differences (p>0.05). The maximum total chlorophyll content in the agricultural organic fertilizer was higher (20.7±1.5 μg g -1) than in Conway's medium (7.0±0.2 μg g -1). The maximum protein (42.6 % dw) and lipid contents (7.6±0.1 % dw) were achieved in the agricultural organic fertilizer group. The significant differences were determined between the groups (p<0.05). The highest carbohydrate (58.1 ±0.4 % dw), ash (12.5&plusum;1.0 % dw) and agar (21.9±0.3 % dw) contents were found in Conway's medium. There was a statistically significant difference between the experimental groups (...

zet İç sularda su bitkilerinin hem ekolojik ve hem de ekonomik yönden büyük önemi vardır. Bu bitk... more zet İç sularda su bitkilerinin hem ekolojik ve hem de ekonomik yönden büyük önemi vardır. Bu bitkiler sucul ekosistemlerde fotosentez olayı ile oksijenlenme sağladıkları gibi çözünmüş mineral maddeleri bünyelerine alarak suların arıtılmasında etkin olarak yer alırlar. Tatlı su akvaryumlarında dekoratif amaçlı da kullanılmaktadırlar. Bu çalışmada Salvinia natans (L.)'ın laboratuar koşullarında farklı nitrat ve karbon kaynakları kullanılarak büyüme özellikleri araştırılmıştır. Yapılan birinci denemede en yüksek büyüme hızı 2. grupta saptanırken (0,070 gr gün -1) en düşük büyüme hızı ise 3. gruptan elde edilmiştir (0,040 gr gün -1). Deneme gruplarının büyüme hızları arasında istatistiksel yönden farklılıkların olduğu bulunmuştur (p<0,05). Farklı CO 2 konsantrasyonlarının büyüme üzerine etkilerinin araştırıldığı ikinci denemede en yüksek büyüme hızı 3. (4 saat ve 0,125 L dk -1 CO 2) grupta 0,062 gün -1 olarak saptanmıştır. En düşük büyüme hızı 1. (1 saat ve 0,125 L dk -1 CO 2) gr...

Fresenius Environmental Bulletin

In this study, the effect of salt concentration on growth characteristics and pigment accumulatio... more In this study, the effect of salt concentration on growth characteristics and pigment accumulation of two strains of Dunaliella viridis Teodoresco (Ayvalk and Dalyan) which were cultured both at the laboratory and outdoor conditions were studied. The highest growth was found at 2M NaCl (1.33±0.12 d-1) for outdoor conditions. The highest cell numbers were observed at Ayvalık strain for both laboratory (8.06±0.40 x106cell ml-1) and outdoor conditions (5.83±0.19 x106cell ml-1). The minimum cell numbers determined at 3M NaCl cultures for laboratory experiments while it was found at 1M NaCl for outdoor cultures. It was measured that the cell volume of laboratory cultures (67.6±14.4 - 198.7±9.8 µm3) were higher than outdoor cultures (48.7±9.7 - 110.5±4.9 µm3). The total chlorophyll (a+b) and carotenoid contents were the highest at laboratory cultures for all salinity concentrations (p<0.05). The total chlorophyll and carotenoid concentration increased with salinity increase at outdoor conditions. In this study, growth rates, cell density and pigment content of two strains of D. viridis (Ayvalık and Dalyan) was determined and compared both under controlled laboratory and outdoor conditions with different salinity regimes. The results showed that the growth parameters and the pigment composition of D. viridis Ayvalk and Dalyan strains were strongly dependent on salinity.

The effects of different light intencities on the Gracilaria verrucosa (Hudson) Papenfuss Culture... more The effects of different light intencities on the Gracilaria verrucosa (Hudson) Papenfuss Culture. In this study, a culture of a red macro algae Gracilaria verrucosa (Hudson) Papenfuss in the continuous water flow indoor 20 lt tank systems with different light intensities was examined. During the study, continuous water exchange was supplied by a water pump from the sea into the tanks. The water flow was recorded as 1. 44 m 3 .day -1 . Daily 12 hrs illumination and 12 hrs dark photo-period cycle was applied above the water surface area in the tanks. During the illumination period, 1000 and 3000 lux light intensities were supplied. During the 3-month study period between November 2002 and January 2003, the water temperature was ranged between 8.7 and 20 0 C. During the experiement G. verrucosa biomass and water quality parameters were measured and recorded periodically. From the result of study, it was concluded that the light intensity and temperature affected growth of algae, and t...

Aquaculture International, 2014

EÜ Su Ürünleri Dergisi, 2006

Bu calismada, Ulva rigida’nin buyume ve besin icerigi uzerine sodyum asetat ve karbondioksitin et... more Bu calismada, Ulva rigida’nin buyume ve besin icerigi uzerine sodyum asetat ve karbondioksitin etkisi arastirilmistir. Ilk denemede, Conway ortamina ek olarak alti farkli sodyum asetat konsantrasyonu; 3,05 mM (1. grup), 6,10 mM (2. grup), 12,20 mM (3. grup), 24,40 mM (4. grup), 36,60 mM (5. grup) ve 48,80 mM (6. grup) kullanilmistir. En yuksek biyomas verimi 6. gruptan elde edilmistir. Ikinci denemede Conway ortamina ek olarak bes farkli CO2 konsantrasyonu; 14,20 mM (I. grup), 28,40 mM (II. grup), 42,60 mM (III. grup), 56,81 mM (IV. grup) ve 71,01 mM (V. grup) uygulanmistir. En yuksek biyomas verimi CO2 kullanilan III. grup icin hesaplanmistir. En yuksek ham protein icerigi 56,81 mM CO2 uygulanan IV. grupta %24,55±0,41 olarak bulunmustur. En yuksek yag icerigi 2. grupta %8,28±0,08 olarak belirlenmistir. Calisma sonucunda Ulva rigida’nin biyomas artisi miktarinin ve besin iceriginin karbon kaynaklarindan etkilendigi belirlenmistir

Food Science and Technology

Turkish Journal of Biology, 2007

zet Bu çalışmada, Spirulina platensis Geitler kullanılarak sulu ortamdan Cu (II) ve Co (II) iyonl... more zet Bu çalışmada, Spirulina platensis Geitler kullanılarak sulu ortamdan Cu (II) ve Co (II) iyonlarının giderilmesi çalışılmış, pH, süre, derişim gibi özelliklerin biyosorpsiyona etkileri incelenmiştir. Biyosorpsiyon kapasitesine pH'ın etki ettiği, en uygun pH'ın her iki iyon için de 6 olduğu ve 30 dk. içerisinde sistemin dengeye geldiği saptanmıştır. Freundlich ve Langmuir izoterm modelleri uygulanmış, seçilen metallerin biyokütleye tutunma şekillerinin (iziksel – kimyasal) değişiklik gösterdiği belirlenmiştir. Karışım metal çözeltilerinin etkileri incelenmiş, karışım metal çözeltilerinde derişimin artmasıyla birlikte metal iyonlarının % tutunma değerlerinin değiştiği görülmüştür. Yüklenen metallerin geri alım denemelerinde, en iyi geri alımın Cu (II) iyonu için % 94,89 ile 0,1 M HCl'de olduğu, Co (II) iyonu içinse, geri alımın etkili olmadığı görülmüştür. Kullanılan adsorplayıcının karakterizasyonu için FTIR analizleri yapılmış, Cu (II) ve Cd (II) iyonlarının –NH, –OH,...

New Knowledge Journal of Science, 2018

In this study, aqueous extracts of five seaweeds collected from Çanakkale, Turkey were studied fo... more In this study, aqueous extracts of five seaweeds collected from Çanakkale, Turkey were studied for free radical scavenging activity and phenolic compounds. The extracts of two brown algae (Cystoseira barbata, Scytosiphon lomentaria), two green algae (Ulva rigida, Enteromorpha intestinalis) and one red algae (Gigartina acicularis) were prepared with boiling. The extract of S. lomentaria demonstrated greater antioxidant potential with a low IC50 (2,67 mg/g Ext.). It was also determined that the free radical scavenging activity of other seaweed extracts were close to this value. The total phenolics, flavonoids and carotenoids of the aqueous extracts ranged from 0,10 (G. acicularis) to 0,66 (C. barbata) mg/g Ext., 1,15 (S. lomentaria) to 1,30 (E. intestinalis) mg/g Ext. and 414,2 (U. rigida) to 2194,5 µg/g Ext. (C. barbata) mg/g, respectively. It was determined that seaweeds collected from Çanakkale exhibited high free radical scavenging capacity. We also found that, the aqueous extracts of brown algae C. barbata had high amounts of phenolic compound. According to our results, aqueous seaweed extracts could be use as organic fertilizers to increase antioxidant levels of agriculture products.

AGRICULTURAL SCIENCE AND TECHNOLOGY, 2018

This study was conducted to determine antioxidant properties and phytochemicals of brown algae Sc... more This study was conducted to determine antioxidant properties and phytochemicals of brown algae Scytosiphon lomentaria (Lyngbye) Link, Cystoseira barbata (Stackhouse) C. Agardh, and Padina pavonica (Linnaeus) Thivy, collected from the Dardanelles (Çanakkale) Strait, Turkey, in February 2018. The antioxidant activity, total carotenoids, condensed tannins, and total content of phenolics and flavonoids in ethanol extracts were quantified. P. pavonica showed the highest antioxidant potential as well as the maximum content of phenolics and carotenoids. The total flavonoid contents changed from 1375.43±2.37 μg/g Ext. (C. barbata) to 2250.92±46.60 μg/g Ext. (S. lomentaria). The highest condensed tannins were found in C. barbata. According to results obtained, C. barbata, S. lomentaria and P. pavonica possess antioxidant activity and could be used in the food and feed industries.

Aquaculture International, 2020

Turkish Journal of Agriculture - Food Science and Technology, 2019

This study reports on the evaluation of the antioxidant of ethanolic extracts of Mytilus gallopro... more This study reports on the evaluation of the antioxidant of ethanolic extracts of Mytilus galloprovincialis and Ruditapes philippinarum collected from the Marmara Sea. The antioxidant activity of the two bivalve species was evaluated using the 2,2-diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging method. The total carotenoid contents were also determined. In the DPPH method, all extracts exhibited low radical scavenging activity when compared to the standards used, i.e. -tocopherol and butylated hydroxytoluene (BHT) with the inhibition percentage in the range of 35.87±0.05 – 36.27±0.02%. In particular, M. galloprovincialis exhibited the highest radical scavenging activity with an IC50 value of 29.55±0.02 mg/g Ext. However, there are no statistically significant differences in the IC50 values of two species. The highest total carotenoid content was found in M. galloprovincialis as 1.13±0.02 µg/g sample. The statistically significant differences were found in total carotenoi...

New knowledge Journal of science, 2018

In this study, aqueous extracts of five seaweeds collected from Canakkale, Turkey were studied fo... more In this study, aqueous extracts of five seaweeds collected from Canakkale, Turkey were studied for free radical scavenging activity and phenolic compounds. The extracts of two brown algae ( Cystoseira barbata, Scytosiphon lomentaria ), two green algae ( Ulva rigida , Enteromorpha intestinalis ) and one red algae ( Gigartina acicularis ) were prepared with boiling. The extract of S. lomentaria demonstrated greater antioxidant potential with a low IC50 (2,67 mg/g Ext.). It was also determined that the free radical scavenging activity of other seaweed extracts were close to this value. The total phenolics, flavonoids and carotenoids of the aqueous extracts ranged from 0,10 ( G. acicularis ) to 0,66 ( C. barbata ) mg/g Ext., 1,15 ( S. lomentaria ) to 1,30 ( E. intestinalis ) mg/g Ext. and 414,2 ( U. rigida ) to 2194,5 µg/g Ext. ( C. barbata ) mg/g, respectively. It was determined that seaweeds collected from Canakkale exhibited high free radical scavenging capacity. We also found that, ...

Petalonia fascia, a brown alga, was used as a biosorbent to remove methylene blue (MB) from aqueo... more Petalonia fascia, a brown alga, was used as a biosorbent to remove methylene blue (MB) from aqueous solutions. In this study, pH, contact time and initial metal concentration of MB were studied. Langmuir and Freundlich isotherm models were also investigated. The optimum pH value was 7 and the adsorption reached equilibrium at 50 min. According to Langmuir’s model data, the maximum adsorption capacity (q ) was 28.50 mgg . Results showed that Petalonia fascia was effectively used as an alternative low cost biosorbent to remove MB from aqueous solutions. <\/div>

Turkish Journal of Agriculture - Food Science and Technology, 2019

In this study, antioxidant activities of two macroalgae, Eucheuma sp. J.Agardh and Laminaria sp.,... more In this study, antioxidant activities of two macroalgae, Eucheuma sp. J.Agardh and Laminaria sp., J.V.Lamouroux used as food supplements were investigated. The antioxidant activity, free radical scavenging activity, the total content of phenolics, flavonoids and condensed tannins in extracts were determined. The IC50 values of the extracts of Eucheuma sp. and Laminaria sp. on DPPH scavenging activity was 2.26±0.03 mg/g and 2.63±0.03 mg/g of extract, respectively. The maximum total phenolic (5.31±0.04 mg GAE/g Ext.) were determined. According to our results, all extracts exhibited low radical scavenging activity when compared to the standards used, i.e. -tocopherol and butylated hydroxytoluene (BHT) with the inhibition percentage in the range of 48.45±0.06% (Eucheuma sp.) – 58.49±0.03% (Laminaria sp.). The highest flavonoid content was measured as 18.78±0.10 mg rutin/g of extract in Laminaria sp. The condensed tannins were not detected in Eucheuma sp. However, this value was measure...

Turkish Journal of Agriculture - Food Science and Technology, 2019

In this study, the antioxidant activities and biochemical characteristics of Ulva rigida (Ulvophy... more In this study, the antioxidant activities and biochemical characteristics of Ulva rigida (Ulvophyceae) and Arthrospira platensis (Cyanophyceae) were determined. The extracts from two seaweed species were evaluated for their free radical scavenging activity, using the 1,1-diphenyl-2-picrylhydrazyl hydrate (DPPH) method, their total phenolic, flavonoid, and condensed tannin contents, through Folin–Ciocalteu, Quettier-Deleu, and Price methods, respectively. The extracts of two seaweeds showed a low free radical scavenging capacity in comparison with commercial antioxidant BHT (butylated hydroxytoluene), and vitamin C. The extract of U. rigida demonstrated greater antioxidant potential with a low IC50 (3.76±0.02 mg/g Ext.). The total phenolic contents were ranged from 2.21±0.08 (U. rigida) to 8.59±0.62 (A. platensis) mg GAE/g of extract. The highest flavonoid content was found in A. platensis as 22.70±0.65 mg rutin/g of extract. The contents of condensed tannin were measured 3.01±0.11 m...

Agricultural Science and Technology, 2018

. This study was conducted to determine antioxidant properties and phytochemicals of brown algae ... more . This study was conducted to determine antioxidant properties and phytochemicals of brown algae Scytosiphon lomentaria (Lyngbye) Link, Cystoseira barbata (Stackhouse) C. Agardh, and Padina pavonica (Linnaeus) Thivy, collected from the Dardanelles (Çanakkale) Strait, Turkey, in February 2018. The antioxidant activity, total carotenoids, condensed tannins, and total content of phenolics and flavonoids in ethanol extracts were quantified. P. pavonica showed the highest antioxidant potential as well as the maximum content of phenolics and carotenoids. The total flavonoid contents changed from 1375.43±2.37 µg/g Ext. (C. barbata) to 2250.92±46.60 µg/g Ext. (S. lomentaria). The highest condensed tannins were found in C. barbata. According to results obtained, C. barbata, S. lomentaria and P. pavonica possess antioxidant activity and could be used in the food and feed industries.

Fresenius Environmental Bulletin

In this study, the effect of an agricultural organic fertilizer on growth, pigment, proximate and... more In this study, the effect of an agricultural organic fertilizer on growth, pigment, proximate and agar content of Gracilaria verrucosa (Hudson) Papenfuss was studied. The highest daily growth rate was determined in the agricultural organic fertilizer group as 4.0 % day -1. Therefore, the growth of G. verrucosa with agricultural organic fertilizer and Conway's medium showed no significant differences (p>0.05). The maximum total chlorophyll content in the agricultural organic fertilizer was higher (20.7±1.5 μg g -1) than in Conway's medium (7.0±0.2 μg g -1). The maximum protein (42.6 % dw) and lipid contents (7.6±0.1 % dw) were achieved in the agricultural organic fertilizer group. The significant differences were determined between the groups (p<0.05). The highest carbohydrate (58.1 ±0.4 % dw), ash (12.5&plusum;1.0 % dw) and agar (21.9±0.3 % dw) contents were found in Conway's medium. There was a statistically significant difference between the experimental groups (...

zet İç sularda su bitkilerinin hem ekolojik ve hem de ekonomik yönden büyük önemi vardır. Bu bitk... more zet İç sularda su bitkilerinin hem ekolojik ve hem de ekonomik yönden büyük önemi vardır. Bu bitkiler sucul ekosistemlerde fotosentez olayı ile oksijenlenme sağladıkları gibi çözünmüş mineral maddeleri bünyelerine alarak suların arıtılmasında etkin olarak yer alırlar. Tatlı su akvaryumlarında dekoratif amaçlı da kullanılmaktadırlar. Bu çalışmada Salvinia natans (L.)'ın laboratuar koşullarında farklı nitrat ve karbon kaynakları kullanılarak büyüme özellikleri araştırılmıştır. Yapılan birinci denemede en yüksek büyüme hızı 2. grupta saptanırken (0,070 gr gün -1) en düşük büyüme hızı ise 3. gruptan elde edilmiştir (0,040 gr gün -1). Deneme gruplarının büyüme hızları arasında istatistiksel yönden farklılıkların olduğu bulunmuştur (p<0,05). Farklı CO 2 konsantrasyonlarının büyüme üzerine etkilerinin araştırıldığı ikinci denemede en yüksek büyüme hızı 3. (4 saat ve 0,125 L dk -1 CO 2) grupta 0,062 gün -1 olarak saptanmıştır. En düşük büyüme hızı 1. (1 saat ve 0,125 L dk -1 CO 2) gr...

Fresenius Environmental Bulletin

In this study, the effect of salt concentration on growth characteristics and pigment accumulatio... more In this study, the effect of salt concentration on growth characteristics and pigment accumulation of two strains of Dunaliella viridis Teodoresco (Ayvalk and Dalyan) which were cultured both at the laboratory and outdoor conditions were studied. The highest growth was found at 2M NaCl (1.33±0.12 d-1) for outdoor conditions. The highest cell numbers were observed at Ayvalık strain for both laboratory (8.06±0.40 x106cell ml-1) and outdoor conditions (5.83±0.19 x106cell ml-1). The minimum cell numbers determined at 3M NaCl cultures for laboratory experiments while it was found at 1M NaCl for outdoor cultures. It was measured that the cell volume of laboratory cultures (67.6±14.4 - 198.7±9.8 µm3) were higher than outdoor cultures (48.7±9.7 - 110.5±4.9 µm3). The total chlorophyll (a+b) and carotenoid contents were the highest at laboratory cultures for all salinity concentrations (p<0.05). The total chlorophyll and carotenoid concentration increased with salinity increase at outdoor conditions. In this study, growth rates, cell density and pigment content of two strains of D. viridis (Ayvalık and Dalyan) was determined and compared both under controlled laboratory and outdoor conditions with different salinity regimes. The results showed that the growth parameters and the pigment composition of D. viridis Ayvalk and Dalyan strains were strongly dependent on salinity.

The effects of different light intencities on the Gracilaria verrucosa (Hudson) Papenfuss Culture... more The effects of different light intencities on the Gracilaria verrucosa (Hudson) Papenfuss Culture. In this study, a culture of a red macro algae Gracilaria verrucosa (Hudson) Papenfuss in the continuous water flow indoor 20 lt tank systems with different light intensities was examined. During the study, continuous water exchange was supplied by a water pump from the sea into the tanks. The water flow was recorded as 1. 44 m 3 .day -1 . Daily 12 hrs illumination and 12 hrs dark photo-period cycle was applied above the water surface area in the tanks. During the illumination period, 1000 and 3000 lux light intensities were supplied. During the 3-month study period between November 2002 and January 2003, the water temperature was ranged between 8.7 and 20 0 C. During the experiement G. verrucosa biomass and water quality parameters were measured and recorded periodically. From the result of study, it was concluded that the light intensity and temperature affected growth of algae, and t...

Aquaculture International, 2014

EÜ Su Ürünleri Dergisi, 2006

Bu calismada, Ulva rigida’nin buyume ve besin icerigi uzerine sodyum asetat ve karbondioksitin et... more Bu calismada, Ulva rigida’nin buyume ve besin icerigi uzerine sodyum asetat ve karbondioksitin etkisi arastirilmistir. Ilk denemede, Conway ortamina ek olarak alti farkli sodyum asetat konsantrasyonu; 3,05 mM (1. grup), 6,10 mM (2. grup), 12,20 mM (3. grup), 24,40 mM (4. grup), 36,60 mM (5. grup) ve 48,80 mM (6. grup) kullanilmistir. En yuksek biyomas verimi 6. gruptan elde edilmistir. Ikinci denemede Conway ortamina ek olarak bes farkli CO2 konsantrasyonu; 14,20 mM (I. grup), 28,40 mM (II. grup), 42,60 mM (III. grup), 56,81 mM (IV. grup) ve 71,01 mM (V. grup) uygulanmistir. En yuksek biyomas verimi CO2 kullanilan III. grup icin hesaplanmistir. En yuksek ham protein icerigi 56,81 mM CO2 uygulanan IV. grupta %24,55±0,41 olarak bulunmustur. En yuksek yag icerigi 2. grupta %8,28±0,08 olarak belirlenmistir. Calisma sonucunda Ulva rigida’nin biyomas artisi miktarinin ve besin iceriginin karbon kaynaklarindan etkilendigi belirlenmistir

Food Science and Technology

Turkish Journal of Biology, 2007

zet Bu çalışmada, Spirulina platensis Geitler kullanılarak sulu ortamdan Cu (II) ve Co (II) iyonl... more zet Bu çalışmada, Spirulina platensis Geitler kullanılarak sulu ortamdan Cu (II) ve Co (II) iyonlarının giderilmesi çalışılmış, pH, süre, derişim gibi özelliklerin biyosorpsiyona etkileri incelenmiştir. Biyosorpsiyon kapasitesine pH'ın etki ettiği, en uygun pH'ın her iki iyon için de 6 olduğu ve 30 dk. içerisinde sistemin dengeye geldiği saptanmıştır. Freundlich ve Langmuir izoterm modelleri uygulanmış, seçilen metallerin biyokütleye tutunma şekillerinin (iziksel – kimyasal) değişiklik gösterdiği belirlenmiştir. Karışım metal çözeltilerinin etkileri incelenmiş, karışım metal çözeltilerinde derişimin artmasıyla birlikte metal iyonlarının % tutunma değerlerinin değiştiği görülmüştür. Yüklenen metallerin geri alım denemelerinde, en iyi geri alımın Cu (II) iyonu için % 94,89 ile 0,1 M HCl'de olduğu, Co (II) iyonu içinse, geri alımın etkili olmadığı görülmüştür. Kullanılan adsorplayıcının karakterizasyonu için FTIR analizleri yapılmış, Cu (II) ve Cd (II) iyonlarının –NH, –OH,...

New Knowledge Journal of Science, 2018

In this study, aqueous extracts of five seaweeds collected from Çanakkale, Turkey were studied fo... more In this study, aqueous extracts of five seaweeds collected from Çanakkale, Turkey were studied for free radical scavenging activity and phenolic compounds. The extracts of two brown algae (Cystoseira barbata, Scytosiphon lomentaria), two green algae (Ulva rigida, Enteromorpha intestinalis) and one red algae (Gigartina acicularis) were prepared with boiling. The extract of S. lomentaria demonstrated greater antioxidant potential with a low IC50 (2,67 mg/g Ext.). It was also determined that the free radical scavenging activity of other seaweed extracts were close to this value. The total phenolics, flavonoids and carotenoids of the aqueous extracts ranged from 0,10 (G. acicularis) to 0,66 (C. barbata) mg/g Ext., 1,15 (S. lomentaria) to 1,30 (E. intestinalis) mg/g Ext. and 414,2 (U. rigida) to 2194,5 µg/g Ext. (C. barbata) mg/g, respectively. It was determined that seaweeds collected from Çanakkale exhibited high free radical scavenging capacity. We also found that, the aqueous extracts of brown algae C. barbata had high amounts of phenolic compound. According to our results, aqueous seaweed extracts could be use as organic fertilizers to increase antioxidant levels of agriculture products.

AGRICULTURAL SCIENCE AND TECHNOLOGY, 2018

This study was conducted to determine antioxidant properties and phytochemicals of brown algae Sc... more This study was conducted to determine antioxidant properties and phytochemicals of brown algae Scytosiphon lomentaria (Lyngbye) Link, Cystoseira barbata (Stackhouse) C. Agardh, and Padina pavonica (Linnaeus) Thivy, collected from the Dardanelles (Çanakkale) Strait, Turkey, in February 2018. The antioxidant activity, total carotenoids, condensed tannins, and total content of phenolics and flavonoids in ethanol extracts were quantified. P. pavonica showed the highest antioxidant potential as well as the maximum content of phenolics and carotenoids. The total flavonoid contents changed from 1375.43±2.37 μg/g Ext. (C. barbata) to 2250.92±46.60 μg/g Ext. (S. lomentaria). The highest condensed tannins were found in C. barbata. According to results obtained, C. barbata, S. lomentaria and P. pavonica possess antioxidant activity and could be used in the food and feed industries.

25 years UNIVERSITY OF AGRIBUSINESS AND RURAL DEVELOPMENT Jubilee International Scientific Conference BULGARIA OF REGIONS Sustainable Regional Development Perspectives 27-28 October 2017, Plovdiv, Bulgaria, 2017

Seaweeds are primary producers in marine environments and they are rich in proteins, minerals, v... more Seaweeds are primary producers in marine environments and they are rich in proteins, minerals, vitamins, polyunsaturated fatty acids, soluble dietary fibers and bioactive antioxidants. Since they contain valuable substances, seaweeds have been used for functional food sources in recent years. These special foods may provide a health benefit beyond nutrition and they could reduce the risk of disease. In Turkish coastal waters, having wide biodiversity, the genus of Gracilaria (Rhodophyceae), Cystoseira (Phaeophyceae), and Ulva (Chlorophyceae) can be evaluated as functional foods. However, there isn't any industry on culturing and/or processing of these valuable seaweeds. This study review that seaweeds which could be evaluated as functional food industry in Turkey.