Biogenic nanomaterials from photosynthetic microorganisms

Jeffryes, Clayton; Agathos, Spiros N.; Rorrer, Gregory L.

doi:10.1016/j.copbio.2014.10.005

Cited by 90 publications

(32 citation statements)

References 70 publications

(91 reference statements)

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“…Afterward, some of the Ag is diffused inside the cell and accumulates in the chloroplast, where the rest of the synthesis takes place due to the photosynthetic components of the organelle. 48 A range of microalgae strains was reported to synthetize various NPs intracellularly or extracellularly, 49 and our study shows that Botryococcus is capable of synthetizing NPs in both ways.…”

Section: Ftir Spectroscopymentioning

confidence: 54%

<em>Botryococcus braunii</em> as a bioreactor for the production of nanoparticles with antimicrobial potentialities

Arévalo-Gallegos¹,

García‐Pérez²,

Carrillo-Nieves³

et al. 2018

IJN

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BackgroundMicroalgae produce metabolites with notable potentialities to act as reducing and capping agents for the synthesis of silver nanoparticles (AgNPs) in a process widely recognized as an eco-friendly and cheaper alternative for the generation of nanoparticles (NPs).MethodsIn the present work, AgNPs were synthesized using live Botryococcus braunii cultures. Two biosynthesis routes were explored: (1) intracellular and (2) extracellular at pH levels of 6–9 using 1–5 mM silver nitrate concentrations.ResultsThe generation of NPs was confirmed via ultraviolet–visible spectroscopy. The morphological characteristics were observed using scanning electron microscopy which revealed that the newly developed AgNPs were mostly spherical in sizes starting from 168 nm. The characteristic peaks in a typical Fourier transform infrared spectroscopy suggested that the exopolysaccharides were the possible reducing and capping agents. The antimicrobial spectrum of the newly developed AgNPs was tested against bacterial strains, both Gram-negative, Gram-positive, and yeast, ie, Escherichia coli (American Type Culture Collection [ATCC] 25922), Pseudomonas aeruginosa (ATCC 27853), Staphylococcus aureus (ATCC 25923), and the yeast Candida albicans (ATCC 10231), respectively. The antimicrobial activity tests showed a stronger inhibition against Gram-negative bacteria. Statistically, the NPs biosynthesized at pH values of 6 and 8 displayed a higher antimicrobial activity.ConclusionOur findings showed that B. braunii is capable of generating AgNPs with antimicrobial potential.

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Section: Ftir Spectroscopymentioning

confidence: 54%

<em>Botryococcus braunii</em> as a bioreactor for the production of nanoparticles with antimicrobial potentialities

Arévalo-Gallegos¹,

García‐Pérez²,

Carrillo-Nieves³

et al. 2018

IJN

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“…This superior physicochemical property makes it much easier to extract pure biosilica from diatom biomass (De Stefano et al, 2009b). However, there is few detailed preparation methods of biosilica from marine diatom biomass (Jeff ryes et al, 2015). In some methods, detergent was used to remove large amount of organic mass, which was proved ineff ective (Hildebrand et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Preparation and characteristics of biosilica derived from marine diatom biomass of Nitzschia closterium and Thalassiosira

Wang

2016

Chin. J. Ocean. Limnol.

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In this study, biosilica of high purity was successfully prepared from marine diatom ( Nitzschia closterium and Thalassiosira ) biomass using an optimized novel method with acid washing treatment followed by thermal treatment of the biomass. The optimal condition of the method was 2% diluted HCl washing and baking at 600°C. The SiO 2 contents of N . closterium biosilica and Thalassiosira biosilica were 92.23% and 91.52%, respectively, which were both higher than that of diatomite biosilica. The SiO 2 morphologies of both biosilica are typical amorphous silica. Besides, N . closterium biosilica possessed micropores and fi bers with a surface area of 59.81 m 2 /g. And Thalassiosira biosilica possessed a mesoporous hierarchical skeleton with a surface area of 9.91 m 2 /g. The results suggest that the biosilica samples obtained in this study present highly porous structures. The prepared porous biosilica material possesses great potential to be used as drug delivery carrier, biosensor, biocatalyst as well as adsorbent in the future.

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“…Diatoms are single‐celled algae that make cell walls of biogenic silica called frustules that are patterned at the submicron and nanoscale. This unique attribute of the diatom cell wall has been harnessed for many potential applications in nanomaterials and nanotechnology . Diatoms within genera Cyclotella and Thalassiosira also produce biofuel lipids approaching 40–42 wt% in the biomass .…”

Section: Introductionmentioning

confidence: 99%

“…This unique attribute of the diatom cell wall has been harnessed for many potential applications in nanomaterials and nanotechnology. 1,2 Diatoms within genera Cyclotella and Thalassiosira also produce biofuel lipids approaching 40-42 wt% in the biomass. 3 Consequently, given their high lipid yield and productivity under diverse environmental conditions, diatoms have recently garnered considerable interest as a platform organism for biofuel production in algal biorefineries.…”

Section: Introductionmentioning

confidence: 99%

Control of chitin nanofiber production by the lipid‐producing diatom Cyclotella Sp. through fed‐batch addition of dissolved silicon and nitrate in a bubble‐column photobioreactor

Chiriboga

Rorrer

2017

Biotechnology Progress

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Diatoms are single-celled algae that make cell walls of nanopatterned biogenic silica called frustules through metabolic uptake of dissolved silicon and its templated condensation into biosilica. The centric marine diatom Cyclotella sp. also produces intracellular lipids and the valued coproduct chitin, an N-acetyl glucosamine biopolymer that is extruded from selected frustule pores as pure nanofibers. The goal of this study was to develop a nutrient feeding strategy to control the production of chitin nanofibers from Cyclotella with the coproduction of biofuel lipids. A two-stage phototrophic cultivation process was developed where Stage I set the cell suspension to a silicon-starved state under batch operation, and Stage II continuously added silicon and nitrate to the silicon-starved cells to enable one more cell doubling to 4 × 10 cells mL . The silicon delivery rate was set to enable a silicon-limited cell division rate under cumulative delivery of 0.8 mM Si and 1.2 mM nitrate (1.5:1 mol N/mol Si) over a 4- to 14-day addition period. In Stage II, both cell number and chitin production were linear with time. Cell number and the specific chitin production rate increased linearly with increasing silicon delivery rate to achieve cumulative product yields of 13 ± 1 mg chitin/10 cells and 33 ± 3 mg lipid/10 cells. Therefore, chitin production is controlled through cell division, which is externally controlled through silicon delivery. Lipid production was not linearly correlated to silicon delivery and occurred primarily during Stage I, just after the complete co-consumption of both dissolved silicon and nitrate. © 2017 American Institute of Chemical Engineers Biotechnol. Prog., 33:407-415, 2017.

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Biogenic nanomaterials from photosynthetic microorganisms

Cited by 90 publications

References 70 publications

<em>Botryococcus braunii</em> as a bioreactor for the production of nanoparticles with antimicrobial potentialities

<em>Botryococcus braunii</em> as a bioreactor for the production of nanoparticles with antimicrobial potentialities

Preparation and characteristics of biosilica derived from marine diatom biomass of Nitzschia closterium and Thalassiosira

Control of chitin nanofiber production by the lipid‐producing diatom Cyclotella Sp. through fed‐batch addition of dissolved silicon and nitrate in a bubble‐column photobioreactor

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