Cationic Surfactant Germination of Bacterial Spores in Pulp
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Solution Overview
Problem
Bacterial spores in pulp suspensions for paper and board production are highly resistant to conventional destruction methods, posing challenges for hygiene and food packaging applications, as they can remain dormant for extended periods and germinate when conditions become favorable.
Innovation Solution
A composition comprising a cationic surfactant with a primary or secondary ammonium head group and a linear unsubstituted C12-alkyl tail is used to induce germination of bacterial endospores in pulp suspensions, allowing for their subsequent destruction using biocidal agents or heat, effectively reducing microbial contamination in paper and board products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional destruction methods (heat, disinfectants, chemical biocides) are used, then vegetative bacteria can be destroyed, but bacterial spores remain resistant and viable
Solution Approach 1:
The patent applies preliminary action by using a cationic surfactant to induce germination of bacterial spores into vegetative form before destruction. This transforms the resistant spore state into a vulnerable vegetative state, allowing subsequent effective destruction by conventional methods. The surfactant treatment precedes and enables the destruction step by changing the microbial form.
Solution Approach 2:
The invention changes the physical-chemical parameters of the treatment process by introducing a cationic surfactant that interacts with spore surfaces. This parameter change (adding surfactant) induces germination by altering the spore's physiological state, making them susceptible to destruction methods that normally would be ineffective against dormant spores.
2Reliability
If biocidal agents are fed into the process to limit bacterial growth, then vegetative bacteria are controlled, but dormant endospores remain unaffected
Solution Approach 1:
The patent achieves universality by combining the cationic surfactant treatment with subsequent destruction methods to create a multi-functional process that effectively targets both vegetative bacteria and spore-forming bacteria. The surfactant acts as a universal activator that prepares both microbial forms for destruction, while the process can be applied throughout the pulp and paper manufacturing chain.
Solution Approach 2:
The surfactant treatment serves as a preliminary action that converts resistant spores into vulnerable vegetative forms, thereby extending the effectiveness of biocidal agents to include spore-forming bacteria. This preliminary transformation enables the biocidal agents to achieve broader coverage against different microbial forms.
3Reliability
If the pulp suspension is treated to reduce spores, then hygiene of final product is improved, but the complex pulp matrix interferes with treatment effectiveness
Solution Approach 1:
The cationic surfactant acts as an intermediary that facilitates interaction between the treatment process and the complex pulp matrix containing spores. The surfactant penetrates and interacts with spores within the complex matrix, enabling effective treatment despite the interfering substances and solid particles present in the pulp suspension.
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
The method significantly reduces bacterial spore counts in pulp suspensions, enabling the production of hygienic paper and board products with low microbial levels, even in complex pulp matrices, and addresses the limitations of conventional methods by ensuring effective interaction with dormant spores and vegetative microorganisms.
Implementation Method 1
a cationic surfactant, which comprises a primary or secondary ammonium head group and linear unsubstituted C12-alkyl tail, effectively interacts with dormant endospores and induces their germination to vegetative form
Implementation Method 2
they can be easily destroyed, either by using a biocidal agent, heat or by the cationic surfactant itself
Data Source
AI summary
The invention relates to use of a composition comprising a cationic surfactant, which comprises a primary or secondary ammonium head group and a linear unsubstituted C12-alkyl tail, for inducing germination of bacterial endospores in pulp suspension for making of paper, board or the like. The invention relates also to a method for quantitatively reducing bacterial endospores in pulp suspension for making of paper, board or the like. The method comprises obtaining of aqueous pulp suspension, and administering the said composition to the pulp suspension. The cationic surfactant is allowed to interact with bacterial endospores in the pulp suspension. Germination of endospores and destroying microorganisms is thus induced.