Browsing by Subject "chlorophyll b"

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    Adsorbent effect of Chlorella vulgaris and Scenedesmus sp. (Chlorophyta) for the removal of some heavy metals and nutrients; [Bazı ağır metal ve nutrient gideriminde Chlorella vulgaris ve Scenedesmus sp. (Chlorophyta)’nin adsorbent etkisi]
    (Turkish Biochemistry Society, 2016) Şentürk T.; Yıldız Ş.
    Objective: The aim of present manuscript is to evaluate the efficiency of two microalgae strains -Chlorella vulgaris and Scenedesmus sp- in removal of some inorganic nutrients and heavy metals. Methods: For this aim the green microalgae (Chlorophyta), grown in controlled laboratory conditions, were used as biosorbent for the removal of six different concentrations of Antimony (Sb3+), Manganese (Mn2+), Copper (Cu2+), Nickel (Ni2+), Phosphate (PO43-) and Nitrate (NO3-) which are prepared in aqueous solutions at conc. 0.1-1 mM for PO43-; 5-30 mM for NO3-; 2,5-100 ppm for heavy metals. Besides, the effects of heavy metals and inorganic nutrients on the cell’s total carbohydrate and chlorophyll a-b content were investigated during 24 hours exposure. Results: According to the results, the average removal efficiency of Phosphate, Nitrate, Antimony, Manganese, Copper and Nickel on C. vulgaris biomass was determined 95.91%, 21.63%, 28.64%, 49.41%, 33.38% and 29.96% while 98.15%, 14.28%, 10.05%, 8.52%, 30.18% and 20.62% on Scenedesmus sp. cells, respectively. On the other hand, the average adsorption capacities of Sb3+, Mn2+, Cu2+, Ni2+, PO43- and NO3- ions were confirmed 0.18, 0.38, 0.28, 0.15, 1.18 and 9.30 mg g-1 by C. vulgaris and 2.99, 0.96, 11.50, 11.33, 0.75 and 4.56 mg g-1 by Scenedesmus sp. biomass. Conclusion: Result of this study suggests that Chlorella vulgaris and Scenedesmus sp. have a remarkable ability on removal of excessive nutrients and heavy metals at laboratory conditions. © 2016, Turkish Biochemistry Society. All rights reserved.
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    Scaling-up of Haematococcus pluvialis production in stirred tank photobioreactor
    (Elsevier Ltd, 2020) Deniz I.
    The objective of this study was to evaluate three most common scale-up criteria for Haematococcus pluvialis production from cultivation bottles to 2 and 10 L of stirred tank PBRs. Constant volumetric power input (P/V) was found to be the most suitable criterion for H. pluvialis production. Total carotenoid amount per biomass concentration in 2 L and 10 L stirred tank PBRs were determined to be 4.57 mg/g and 4.77 mg/g, respectively. Antioxidant activity of total carotenoids extracted from H. pluvialis was also higher at constant P/V criterion where 46.91% inhibition rate with a total phenolic content of 11.76 mg gallic acid/L was achieved. Obtained results could be used to expand the bioproduction of H. pluvialis and its extracts in commercial scale. © 2020 Elsevier Ltd
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    Effect of ultrasound assisted cleaning on pesticide removal and quality characteristics of Vitis vinifera leaves
    (Elsevier B.V., 2023) Aydar A.Y.; Aydın T.; Karaiz A.; Alabey F.; Kothakota A.; Raposo A.; Abdullah Albaridi N.; Pandiselvam R.
    In this study, the pesticide (acetamiprid, deltamethrin, and pyridaben) removal and physicochemical quality improvement of vine (Vitis vinifera) leaf were examined using ultrasonic and traditional cleaning for 5, 10, and 15 min. After an ultrasonic cleaning procedure at 37 kHz for 10 min, acetamiprid, deltamethrin, and pyridaben in vine leaf were reduced by 54.76, 58.22, and 54.55 %, respectively. Furthermore, the total phenolic content (TPC) in vine leaf increased to 13.45 mg GAE/g DW compared to that in control samples using traditional cleaning (10.37 mg GAE/g DW), but there were no significant differences in DPPH radical scavenging activity. After 15 min of conventional cleaning, the total chlorophyll and total carotenoid content of leaves were found to be lowest among all samples, at 6.52 mg/kg and 0.48 mg/kg, respectively. In conclusion, when compared to conventional cleaning methods, ultrasonic cleaning with no chemicals or heat treatment has proven to be a successful and environmentally friendly application in reducing commonly used pesticides and improving the physicochemical qualities of leaves. © 2022 The Author(s)