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Bhattacharjya R, Tyagi R, Rastogi S, Ulmann L, Tiwari A. Response of varying combined nutrients on biomass and biochemical composition of marine diatoms Chaetoceros gracilis and Thalassiosira weissflogii. BIORESOURCE TECHNOLOGY 2024; 394:130274. [PMID: 38160848 DOI: 10.1016/j.biortech.2023.130274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 12/27/2023] [Accepted: 12/27/2023] [Indexed: 01/03/2024]
Abstract
Marine diatoms have high adaptability and are known to accumulate lipids under nutrient stress conditions. The present study involves determining the effect of varying macro and micronutrients on growth kinetics and metabolite production of oleaginous marine diatoms, Thalassiosira weissflogii and Chaetoceros gracilis. The results highlighted that C. gracilis and T. weissflogii showed maximum biomass yield of 0.86 ± 0.06 g/L and 0.76 ± 0.01 g/L in the 2f and f supplemented medium respectively. A 2.5-fold increase in cellular lipid content was recorded in the 2f culture setup of both strains ranging from 20 % to 26.7 % (w/w). The study also reveals that high eutrophic nutrient media (f, 2f and 4f) triggered biomass productivity as well as total protein and carbohydrate content in both strains. Thus, providing a reproducible insight of trophic flexibility of diatoms, concomitant with the increment in multiple commercially valuable products.
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Affiliation(s)
- Raya Bhattacharjya
- Diatom Research Laboratory, Amity Institute of Biotechnology, Amity University, Noida, India
| | - Rashi Tyagi
- Diatom Research Laboratory, Amity Institute of Biotechnology, Amity University, Noida, India
| | - Subha Rastogi
- CSIR-National Botanical Research Institute, 436, Pratap Marg, Lucknow 226001, Uttar, India; CSIR-National Institute of Science Communication and Policy Research, New Delhi, India Pradesh, India
| | - Lionel Ulmann
- Laboratoire BiOSSE: Biologie des Organismes, Stress, Santé, Environnement, IUT Département Génie Biologique, Le Mans Université, F-53020 Laval, France
| | - Archana Tiwari
- Diatom Research Laboratory, Amity Institute of Biotechnology, Amity University, Noida, India.
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Verwee E, Van de Walle D, De Bruyne M, Mienis E, Sekulic M, Chaerle P, Vyverman W, Foubert I, Dewettinck K. Visualisation of microalgal lipid bodies through electron microscopy. J Microsc 2024; 293:118-131. [PMID: 38149687 DOI: 10.1111/jmi.13259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2023] [Revised: 12/20/2023] [Accepted: 12/22/2023] [Indexed: 12/28/2023]
Abstract
In this study, transmission electron microscopy (TEM) and cryo-scanning electron microscopy (cryo-SEM) were evaluated for their ability to detect lipid bodies in microalgae. To do so, Phaeodactylum tricornutum and Nannochloropsis oculata cells were harvested in both the mid-exponential and early stationary growth phase. Two different cryo-SEM cutting methods were compared: cryo-planing and freeze-fracturing. The results showed that, despite the longer preparation time, TEM visualisation preceded by cryo-immobilisation allows a clear detection of lipid bodies and is preferable to cryo-SEM. Using freeze-fracturing, lipid bodies were rarely detected. This was only feasible if crystalline layers in the internal structure, most likely related to sterol esters or di-saturated triacylglycerols, were revealed. Furthermore, lipid bodies could not be detected using cryo-planing. Cryo-SEM is also not the preferred technique to recognise other organelles besides lipid bodies, yet it did reveal chloroplasts in both species and filament-containing organelles in cryo-planed Nannochloropsis oculata samples.
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Affiliation(s)
- Ellen Verwee
- Department of Food Technology, Food Structure & Function research group, Safety and Health, Ghent University, Ghent, Belgium
- Department of Biotechnology, Ghent University, Ghent, Belgium
| | - Davy Van de Walle
- Department of Food Technology, Food Structure & Function research group, Safety and Health, Ghent University, Ghent, Belgium
| | - Michiel De Bruyne
- VIB BioImaging Core VIB, Ghent, Belgium
- VIB Center for Inflammation Research VIB, Ghent, Belgium
- Department of Biomedical Molecular Biology, Ghent University, Ghent, Belgium
| | - Esther Mienis
- Research Unit Food & Lipids, KU Leuven Kulak, Kortrijk, Belgium
- Leuven Food Science and Nutrition Research Centre (LFoRCe), KU Leuven, Leuven, Belgium
| | - Mirna Sekulic
- Department of Biology, Laboratory of Protistology and Aquatic Ecology, Ghent University, Ghent, Belgium
- VIB Center for Plant Systems Biology VIB, Ghent, Belgium
| | - Peter Chaerle
- Department of Biology, Laboratory of Protistology and Aquatic Ecology, Ghent University, Ghent, Belgium
- Department of Biology, BCCM/DCG Diatoms Collection, Ghent University, Ghent, Belgium
| | - Wim Vyverman
- Department of Biology, Laboratory of Protistology and Aquatic Ecology, Ghent University, Ghent, Belgium
| | - Imogen Foubert
- Research Unit Food & Lipids, KU Leuven Kulak, Kortrijk, Belgium
- Leuven Food Science and Nutrition Research Centre (LFoRCe), KU Leuven, Leuven, Belgium
| | - Koen Dewettinck
- Department of Food Technology, Food Structure & Function research group, Safety and Health, Ghent University, Ghent, Belgium
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