Related Experiment Video
Updated: May 7, 2026
08:55
Facile Protocol for the Synthesis of Self-assembling Polyamine-based Peptide Amphiphiles (PPAs) and Related Biomaterials
Published on: June 25, 2018
Optimization of cationic amino starch synthesis using biogenic amines
Renil John Anthony1, Ronald C Sims
1Department of Biological Engineering, Utah State University, 4105 Old Main Hill, Logan, UT 84322-4105, United States.
Carbohydrate Polymers
|September 24, 2013
Summary
Modified potato starch with biogenic amines creates a cost-effective cationic flocculant for microalgae harvesting. This optimized method enhances efficiency for large-scale algal bioproduct production.
Area of Science:
- Biotechnology
- Materials Science
- Chemical Engineering
Background:
- Microalgae harvesting is crucial for cost-effective bioproducts, with coagulation-flocculation being a leading method.
- Developing economical and efficient harvesting techniques remains a significant challenge in algal biotechnology.
Purpose of the Study:
- To modify native potato starch using biogenic amines to create a cationic flocculant.
- To optimize reaction parameters (time, temperature, concentrations) for synthesizing cationic amino starch.
- To evaluate the zeta potential of modified starches for microalgae destabilization.
Main Methods:
- Native potato starch was modified with biogenic amines (putrescine, histamine, cadaverine, tyramine).
- Reaction parameters including time, temperature, and amine-to-starch ratio were systematically varied.
- Zeta potential measurements were used to assess the efficacy of the cationic amino starch.
Main Results:
- Histamine-cationic amino starch showed high zeta potential (+9.0±2.0 mV) at lower temperatures.
- Putrescine, cadaverine, and tyramine-cationic amino starches achieved higher zeta potential with increased amine-to-starch ratios.
- Optimized conditions were identified for synthesizing effective cationic amino starches.
Conclusions:
- Cationic amino starch derived from biogenic amines offers an efficient and potentially low-cost method for microalgae harvesting.
- The study provides a foundation for utilizing waste-derived biogenic amines in starch modification for biotechnological applications.
- Tailoring reaction conditions allows for the design of specific cationic amino starches for targeted applications.
Related Concept Videos
01:25Production of Organic Acids
Lactic acid, an important organic acid extensively applied in food, pharmaceutical, and biodegradable polymer industries, is primarily produced via microbial fermentation. This method is favored over chemical synthesis due to its environmental sustainability and capacity for enantiomerically pure product formation. Among various microbial processes, the fermentation of starch-based substrates stands out due to the abundance and renewability of raw materials like corn and potatoes.Hydrolysis of...
01:22Preparation of 1° Amines: Azide Synthesis
Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
01:38Preparation of Amines: Reductive Amination of Aldehydes and Ketones
Carbonyl compounds and primary amines undergo reductive amination first to produce imines, followed by secondary amines in the same reaction mixture, using selective reducing agents like sodium cyanoborohydride or sodium triacetoxyborohydride. Reductive amination produces different degrees of substitution of amines depending on the starting amine substrate.
01:18Amino Acid Catabolism
Microorganisms rely on proteins as an essential carbon and energy source, particularly in environments with limited polysaccharides or lipids. However, proteins are too large to cross the plasma membrane unaided, necessitating enzymatic degradation. Microbes secrete extracellular proteases and peptidases that hydrolyze proteins into peptides, which can then be transported across the membrane. Once inside the cell, intracellular proteases degrade these peptides into free amino acids, which...
01:19Amines to Amides: Acylation of Amines
Various carboxylic acid derivatives (such as acid chlorides, esters, and anhydrides) can be used for the acylation of amines to yield amides. The reaction requires two equivalents of amines. The first amine molecule functions as a nucleophile and attacks the carbonyl carbon to produce a tetrahedral intermediate. This is followed by the loss of the leaving group and restoration of the C=O bond.
Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary amide...
Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary amide...
01:29Preparation of Amides
Amides are synthesized by treating carboxylic acids with amines in the presence of dehydrating agents like dicyclohexylcarbodiimide (DCC).
The DCC-promoted synthesis of amides begins with the protonation of DCC by carboxylic acid. The protonation makes it a better acceptor. Next, the addition of carboxylate to the protonated carbodiimide gives a reactive acylating agent.
Subsequently, the amine acts as a nucleophile that attacks the acylating agent to form a tetrahedral intermediate. In the...
The DCC-promoted synthesis of amides begins with the protonation of DCC by carboxylic acid. The protonation makes it a better acceptor. Next, the addition of carboxylate to the protonated carbodiimide gives a reactive acylating agent.
Subsequently, the amine acts as a nucleophile that attacks the acylating agent to form a tetrahedral intermediate. In the...