Algae Lipid Extraction Using Ethanol and Silica Gel Purification
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Solution Overview
Problem
Current methods for extracting polyunsaturated fatty acids (PUFAs) from algae are inefficient due to the need for cell disruption, which decreases yield, and struggle with removing impurities like chlorophyll, leading to poor oil quality and increased production costs.
Innovation Solution
A method involving contacting dry algae with ethanol, followed by transesterification to produce fatty acid alkyl esters, and then using a mixture of hexane and water for extraction, with silica gel to remove impurities, including chlorophyll, while regenerating the silica gel for cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cell disruption is performed to enhance lipid extraction, then access of extracting solvent to fatty acids is improved, but yield of polyunsaturated fatty acids decreases
Solution Approach 1:
The patent extracts lipids directly from intact algal cells using organic solvents without performing cell disruption. This approach takes out the beneficial lipids while leaving the cellular structure intact, thereby avoiding the harmful effect of cell disruption on PUFA yield while still achieving effective extraction.
Solution Approach 2:
The patent uses organic solvents as intermediaries to access and extract lipids from intact algal cells. The solvents penetrate the cell walls and membranes without requiring mechanical disruption, serving as a chemical mediator that bridges the gap between the external environment and intracellular lipids.
2Quantity of substance
If direct extraction from algal cells is performed without cell disruption, then yield of polyunsaturated fatty acids is maintained, but removal of impurities like chlorophyll becomes difficult
Solution Approach 1:
The patent segments the extraction process into multiple stages: initial extraction with organic solvent, followed by sequential washing steps using different solvents (water, acidified water, baseified water). Each washing stage targets specific types of impurities, systematically separating them from the desired lipids.
Solution Approach 2:
The patent changes the chemical parameters of the washing solution throughout the process - starting with neutral water, then acidified water (pH 2-3), and finally baseified water (pH 10-11). These parameter changes enable selective removal of different impurity types while preserving the integrity of the extracted lipids.
3Manufacturing precision
If multiple washing steps are performed to remove impurities, then purity of extracted oil is improved, but production time and complexity increase
Solution Approach 1:
The patent implements a continuous multi-stage washing process where each washing step builds upon the previous one. The filtrate from each stage is used as the washing medium for the next stage, creating a continuous flow of purification actions that efficiently remove progressively harder-to-remove impurities without requiring intermediate processing steps.
Solution Approach 2:
The patent performs preliminary removal of easily removable impurities in early washing stages using simple aqueous solutions. This preliminary action prepares the extract for more sophisticated purification steps, ensuring that the most abundant and easily removable contaminants are eliminated first, making subsequent purification steps more effective and efficient.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method efficiently produces PUFAs free or substantially free of chlorophyll, maintaining high yield and concentration, and allows for large-scale industrial application with reduced production costs.
Implementation Method 1
contacting dry algae with ethanol to extract lipids
Implementation Method 2
The crude oil was then mixed with silica gel to remove impurities, including chlorophyll
Implementation Method 3
using a mixture of hexane and water for extraction
Data Source
AI summary
Disclosed is a method for producing algae-derived polyunsaturated fatty acids, comprising the steps of a) contacting dry algae with ethanol; b) removing ethanol to obtain crude oil; c) subjecting the crude oil to a transesterification reaction with a lower alcohol to generate fatty acid alkyl esters; d) extracting the fatty acid alkyl esters to result in a phase containing fatty acid alkyl esters; e) collecting the phase containing fatty acid alkyl esters; and f) contacting the collected phase with silica gel. Also disclosed is a method for effectively removing impurities, including chlorophyll, fucoxanthin and beta-carotene, from crude algal fatty acid alkyl esters, comprising contacting the crude algal fatty acid alkyl esters with silica gel in hexane.