Article
Chemistry, Multidisciplinary
Laura Koenig-Mattern, Steffen Linke, Liisa Rihko-Struckmann, Kai Sundmacher
Summary: Microalgae have great potential as producers of fine and platform chemicals, but energy-efficient separation strategies for their biomass are still under research and no economically viable biorefinery process exists. By fractionating wet algae biomass, valuable target molecules can be purified and converted, eliminating energy expenses, and promoting further utilization.
Article
Engineering, Environmental
Laure Wetterwald, Antoine Leybros, Gatien Fleury, Florian Delrue, Alexandra Dimitriades-Lemaire, Paul Chambonniere, Audrey Hertz
Summary: This study investigates the effects of water content, operating pressure and temperature on supercritical CO2 extraction of lipids from Chlorella vulgaris microalgae. The highest extraction yield was obtained with freeze-dried microalgae at 40℃ and 200 bar. However, extracts obtained at 40℃ and 250 bar had the highest fatty acid content, while those obtained at 60℃ and 250 bar had the highest cetane number and oxidative stability. Water in the initial biomass had a negative impact on total extraction yield, but promoted the extraction of fatty acids, particularly monounsaturated ones.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Agricultural Engineering
Quan Wang, Kazuyuki Oshita, Masaki Takaoka, Kenji Shiota
Summary: The study explored the use of subcritical dimethyl ether as a green solvent to extract lipids from microalgae, finding that heating, microwave, and ultrasonic treatments significantly improved the extraction process by increasing cell wall permeability. The extraction process effectively removed free water from microalgal cells with well-extracted lipids, while leaving bound water intact in the cells.
BIORESOURCE TECHNOLOGY
(2021)
Article
Acoustics
Sooridarsan Krishnan, Noraini Abd Ghani, Noor Fathanah Aminuddin, Khurrum Shehzad Quraishi, Beatrice Luciana Razafindramangarafara, Stephane Baup, Jean-Marc Leveque
Summary: This study investigates the potential of using small amounts of ionic liquids to enhance ultrasound-assisted extraction of lipids content from green microalgae. The findings suggest that the addition of ILs improves ultrasonication by enhancing viscosity and reducing water surface tension, resulting in a more powerful acoustic cavitation process. Additionally, the yield of extracted lipids from green microalgae shows an incremental trend with increasing IL concentration.
ULTRASONICS SONOCHEMISTRY
(2021)
Article
Biochemistry & Molecular Biology
Marko Krstic, Nemanja Teslic, Perica Boskovic, Darija Obradovic, Zoran Zekovic, Anita Milic, Branimir Pavlic
Summary: This study aimed to extract bioactive compounds from the Ranco genotype of garlic using subcritical water extraction (SWE) and pressurized liquid extraction (PLE). Results showed that PLE provided significant advantages in terms of yield and antioxidant activity of garlic extracts, indicating that high-pressure processes can be used as clean and green procedures for the extraction of garlic bioactives.
Article
Biotechnology & Applied Microbiology
Lina Maria Gonzalez-Gonzalez, Sergi Astals, Steven Pratt, Paul D. Jensen, Peer M. Schenk
Summary: An integrated system for biodiesel and biogas production from Chaetoceros muelleri was evaluated, showing that osmotic shock pre-treatment of wet microalgae biomass released up to 72% lipid content and improved methane production significantly.
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2021)
Article
Biotechnology & Applied Microbiology
Mohammed Talhami, Afnan A. Mussa, Mahmoud Ibrahim Thaher, Probir Das, Aida Rafat Abouelela, Alaa H. Hawari
Summary: This study investigates the use of protic ionic liquids with methanol co-solvent for the extraction of lipids from microalgae. The results show that protic ionic liquids have a high lipid extraction performance, with an 81% extraction rate from Coelastrella sp. The study suggests that protic ionic liquids are a promising cost-effective and eco-friendly method for treating microalgal biomass.
BIOCHEMICAL ENGINEERING JOURNAL
(2023)
Article
Biotechnology & Applied Microbiology
Jiajie Xu, Fengmin Zhao, Xiurong Su
Summary: Microalgae are being explored as a novel source of food and functional products due to the valuable natural products they contain. Super-high hydrostatic pressure (SHHP) technology is effective in achieving high cell disruption and lipid extraction yields from wet microalgae slurries, offering advantages over other extraction methods.
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2021)
Article
Agricultural Engineering
Dong Liang, Asraful Alam, Luying Lu, Ronglei Fan, Jingliang Xu, Jingcheng Wu
Summary: A novel strategy combining water-plasma and three-phase partitioning techniques was introduced to improve the efficiency and recovery of lipid extraction from microalgal biomass, leading to reduced energy consumption and potential biodiesel production.
BIORESOURCE TECHNOLOGY
(2022)
Review
Energy & Fuels
Sreya Sarkar, Kalyan Gayen, Tridib Kumar Bhowmick
Summary: Biomolecules present in algae, such as carbohydrates, proteins, pigments, and lipids, have wide applications in various industries. Supercritical fluid extraction (SFE) and subcritical water extraction (SWE) are considered as sustainable and promising green extraction technologies for extracting valuable bioactive molecules from algae. This review discusses the extraction of biomolecules using SFE and SWE techniques, the improvement of these technologies, and the challenges and perspectives in their use on algae.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Chemistry, Multidisciplinary
Carlota Delso, Aude Silve, Ruediger Wuestner, Natalja Nazarova, Ignacio Alvarez, Javier Raso, Wolfgang Frey
Summary: This study focuses on under-investigated processing parameters of pulsed electric field (PEF) treatment for efficient lipid extraction from microalgae, such as media pH, pulse application, and incubation protocols. The results show that medium pH is critical in the final electroporation and lipid extraction yields, and should be considered in further studies.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Review
Microbiology
Shiqiu Zhang, Lijie Zhang, Geng Xu, Fei Li, Xiaokang Li
Summary: This review introduces the basic characteristics and application fields of microalgae and discusses the influencing parameters and recent advanced technologies for microalgae biodiesel production. It aims to provide useful information to help future development of efficient and commercially viable technology for microalgae-based biodiesel production.
FRONTIERS IN MICROBIOLOGY
(2022)
Article
Agricultural Engineering
Wanniarachchige Paramitha Sandani, Malith Premaratne, Thilini U. Ariyadasa, Jagath Kumara Premachandra
Summary: The Electro-Fenton process was studied as a potential cell disruption technique for recovery of lipids from wet biomass of the microalga Chlorella homosphaera. A maximum lipid yield of 19.99 +/- 1.33% was achieved at 40 min reaction time and 4.38 g/L biomass concentration. Biodiesel synthesized from lipids obtained via EFP conformed to the ASTM D6751-12 standard.
BIORESOURCE TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Manuel C. Bauer, Gero C. Becker, Andrea Kruse
Summary: This study optimized the batch extraction of wet algae using dimethyl ether (DME) to avoid drying. The results showed that increasing the water content of the algae samples enhanced crude oil yields and fatty acid recoveries.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Ilgyu Lee, Jong-In Han
Summary: Microalgal biorefineries present a green alternative with integrated processes and economic viability for commercializing microalgae-derived products. The combination of Fenton-like reaction and hydrodynamic cavitation (HC) significantly improved lipid extraction efficiencies from wet microalgae. Optimal conditions for lipid extraction and chlorophyll removal were found to be 0.79% hydrogen peroxide at pH 3.41, but the extracted lipids exhibited higher viscosity and stickiness than those from conventional methods.
