Cultivation of Green Microalgae in Bubble Column Photobioreactors and an Assay for Neutral Lipids
January 7th, 2019
Here, we present a protocol to construct lab-scale bubble column photobioreactors and use them to culture microalgae. It also provides a method for the determination of the culture growth rate and neutral lipid content.
Overview
This protocol provides instructions for constructing and using a Bubble Column Photobioreactor system to culture microalgae. It is relevant for researchers interested in algal biofuels, wastewater treatment, and algal biology.
Key Study Components
Area of Science
- Microalgae cultivation
- Bioreactor design
- Algal biofuels
Background
- Microalgae are a promising source for biofuels.
- Bubble column photobioreactors can enhance growth rates.
- Cost-effective alternatives to commercial systems exist.
- Customization for various algal species is possible.
Purpose of Study
- To construct a lab-scale photobioreactor for microalgae.
- To determine culture growth rates.
- To assess neutral lipid content in cultures.
Methods Used
- Construction of vented lids from plastic materials.
- Use of O rings and panel mount fittings for assembly.
- Customization of the reactor for different algae species.
- Measurement of growth rates and lipid content.
Main Results
- The reactor system produced reliable results.
- It is adaptable to a wide range of algae.
- Cost-effective compared to commercial options.
- Demonstrated successful growth of microalgae.
Conclusions
- The Bubble Column Photobioreactor is effective for microalgae culture.
- It offers a customizable and economical solution for researchers.
- Future studies can build on this protocol for various applications.
Frequently Asked Questions
Executive Industry Relevance
This protocol enables reproducible, low-cost cultivation of microalgae in laboratory-scale photobioreactors, supporting early-stage discovery in algal biofuels and wastewater treatment. By integrating growth monitoring with quantitative neutral lipid assays, it provides a scalable platform for target validation and phenotypic screening of algal strains. The system bridges simple flask culture and industrial bioreactors, offering predictive confidence in lipid productivity for strain selection and process optimization.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Scientific Value: Enables interrogation of microbial interactions on algal growth and lipid accumulation for target de-risking.
- Operational Value: Supports reproducible biomass and lipid quantification across biological replicates.
Screening & Assay Development
- Scientific Value: Delivers quantitative neutral lipid measurements via microplate assay for high-throughput strain evaluation.
- Operational Value: Standardizes lipid extraction and fluorescence-based detection for assay reproducibility.
Translational & Preclinical Research
- Scientific Value: Connects algal lipid phenotypes to energy storage pathways for translational biomarker alignment.
- Operational Value: Enables continuity from discovery to preclinical validation through standardized dry weight and lipid workflows.
Pipeline & Workflow Integration
The method fits within the discovery continuum from strain screening to lead identification, supporting data-driven decisions in algal bioproduct development.
- Discovery Biology: Facilitates hypothesis testing on co-culture effects and metabolic inhibitors on algal growth and lipid production.
- Screening: Delivers reproducible optical density and dry weight correlations for reliable biomass tracking.
- Analytics: Provides neutral lipid readouts via Nile red fluorescence for comparative strain assessment.
- Translational Research: Links lipid phenotypes to biochemical profiles (e.g., triose glycerol) for pathway validation.
- Enterprise Reuse: Offers a modular, adaptable photobioreactor platform for multi-species and co-culture screening campaigns.
Operational & Enterprise Impact
- Scientific Value: Reduces mechanistic ambiguity in algal lipid production through controlled, reproducible culture conditions.
- Operational Value: Ensures standardization, low variability, and scalability with tight standard deviations even at low replicate numbers.
- Strategic Value: Improves go/no-go decisions in strain selection by linking growth phenotypes to lipid yields.
- Portfolio Impact: Enables risk-adjusted prioritization of algal strains based on validated lipid productivity data.
Implementation Considerations
- Requires expertise in aseptic technique, centrifugation, and lipid handling.
- Needs photobioreactor hardware, centrifuge, vortexer, bead mill, and fluorescence microplate reader.
- Demands standardization of OD-to-dry weight calibration and lipid extraction efficiency across users.
- Involves adaptation considerations for non-algal co-contaminants and varying light/aeration needs.
- Includes practical limitations such as manual sampling frequency and bead-based homogenization variability.
Biopharma FAQs
Chapters in this video
0:04
Title
0:42
Setup of Bubble Column Photobioreactors
2:13
Cultivation of Microalgae in Bubble Column Photobioreactors
4:03
Harvest and Freeze Drying of Microalgal Biomass
5:28
Lipid Extraction Using a Modified Folch Method
7:07
Neutral Lipid Assay Using a Microplate Method (Adapted from Higgins et al. 201422)
9:01
Results: Auxenochlorella protothecoides Growth Results and Chlorella sorokiniana Neutral Lipid Data
10:35
Conclusion
