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2 results on '"galbana"'

1. Investigating the effect of different concentrations of copper on microalgae density Isochrysis galbana in laboratory condition

Author

Zohreh Barkhordari ahmadi, Mohammad Reza Taheri zadeh, and Morteza Yousef zadi

Subjects
microalgae, isochrysis, galbana, copper metal, growth protein content, Ecology, QH540-549.5
Abstract

Phytoplanktons are considered to be important resources in terms of the production of organic materials, and being in the base of food pyramid. In this study, the toxicity of heavy metal "Copper" at different concentrations (500, 250, 100, 50, 5 and 0 μg / L) on the growth of I. galbana microalgae was evaluated in three replicates in a period of 15 days. The highest growth rate and chlorophyll a content was obtained at concentration of 5 μg/L, but concentrations of 500 and 250 μg/L of copper significantly inhibited the growth of I. galbana and reduced the chlorophyll content. Also, the results showed that low concentrations of copper increased the protein content, but high concentrations caused a decrease in protein content of I. galbana.

Published
2019

2. Pressurized liquid extraction with ethanol as a green and efficient technology to lipid extraction of Isochrysis biomass

Author

Zicheng Huang, Chen Zhong, Zheng Guo, Bilian Chen, and Yongjin He

Subjects
0106 biological sciences, Environmental Engineering, Microalgae biomass, Biomass, Bioengineering, 010501 environmental sciences, 01 natural sciences, ALGAL BIOMASS, Aquatic organisms, chemistry.chemical_compound, Lipid extraction, FOOD, 010608 biotechnology, Microalgae, Isochrysis, Waste Management and Disposal, GALBANA, ULTRASOUND, 0105 earth and related environmental sciences, POLYUNSATURATED FATTY-ACIDS, Ethanol, Chromatography, biology, Renewable Energy, Sustainability and the Environment, Extraction (chemistry), Haptophyta, General Medicine, OIL PRODUCTION, QUANTIFICATION, biology.organism_classification, Lipids, TRIACYLGLYCEROLS, chemistry, WET MICROALGAL BIOMASS, Pressurized liquid extraction, GROWTH, Isochrysis sp
Abstract

This work was the first time to establish a green pressurized liquid extraction (PLE) process to extract microalgal lipids from Isochrysis biomass. PLE with ethanol exhibited superior lipid extraction performance in comparison to Soxhlet and Folch methods and PLE with n-hexane. To reduce the cost in ethanol utilization, ethanol concentration was optimized and found that PLE with 90% ethanol concentration obtained the highest lipid extraction efficiency (41.5 wt%) and total fatty acids (TFAs) recovery value (92.17 wt%) using Isochrysis sp. biomass. Results about lipid class detected by TLC-FID technique showed that ethanol concentration distinctly affected the content of lipidic class during lipid extraction by PLE. Similarly, the process with 90% ethanol concentration achieved over 90 wt% of TFAs recovery values with three different Isochrysis species. Overall, PLE process mediated with ethanol was a promising approach to extract Isochrysis-derived lipids from sustainable microalgal biomass for food application.

Published
2019
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