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Water-based alkyl ketene dimer ink for user-friendly patterning in paper microfluidics

Water-based alkyl ketene dimer ink for user-friendly patterning in paper microfluidics

Posted on May 2, 2020May 3, 2020 by Lindsey

We suggest the usage of water-based alkyl ketene dimer (AKD) ink for quick and user-friendly patterning of paper microfluidic units both manually or utilizing a cheap XY-plotter. The ink was produced by dissolving hydrophobic AKD in chloroform and emulsifying the answer in water.

The emulsification was carried out in a heat water tub, which led to an elevated price of the evaporation of chloroform. Subsequent cooling led to the ultimate product, an aqueous suspension of high quality AKD particles.

The results of surfactant and AKD concentrations, emulsification process, and cooling method on closing ink properties are offered, together with an optimized protocol for its formulation.

 Water-based alkyl ketene dimer ink for user-friendly patterning in paper microfluidics
TOXLET, Accepted manuscript. doi:10.1016/j.toxlet.2015.10.010

This hydrophobic agent was utilized onto paper utilizing a plotter pen, after which the paper was heated to permit spreading of AKD molecules and chemical bonding with cellulose. A paper floor patterned with the ink (10 g L-1 AKD) yielded a contact angle of 135.6° for water. Unlike natural solvent-based options of AKD, this AKD ink doesn’t require a fume hood for its use.

Moreover, it’s suitable with plastic patterning instruments, because of the efficient removing of chloroform in the production course of to lower than 2% of the full quantity. Furthermore, this water-based ink is straightforward to arrange and use. Finally, the AKD ink may also be used for the fabrication of so-called selectively permeable obstacles for use in paper microfluidic networks. These are obstacles that cease the stream of water via paper, however are permeable to solvents with decrease floor energies.

We utilized the AKD ink to restrict and preconcentrate pattern on paper, and demonstrated the usage of this method to realize increased detection sensitivities in paper spray ionization-mass spectrometry (PSI-MS). Our patterning method might be employed outdoors of the analytical lab or machine workshop for quick prototyping and small-scale production of paper-based analytical instruments, for use in limited-resource labs or in the sector.

Recombinant Lactococcus lactis for environment friendly conversion of cellodextrins into L-lactic acid

Lactic acid micro organism (LAB) are among the many most fascinating organisms for industrial processes with an extended historical past of utility as meals starters and biocontrol brokers, and an underexploited potential for biorefineries changing biomass into high-value compounds.

Lactic acid (LA), their important fermentation product, is among the many most requested chemical substances owing to its broad vary of functions. Notably, LA polymers, that’s, polylactides, have excessive potential as biodegradable substitutes of fossil-derived plastics. However, LA production by LAB fermentation is at the moment too costly for polylactide to be cost-competitive with conventional plastics. 

LAB have complicated dietary necessities and can’t ferment cheap substrates similar to cellulose. Metabolic engineering may assist scale back such dietary necessities and allow LAB to instantly ferment low-cost polysaccharides. Here, we engineered a Lactococcus lactis pressure which constitutively secretes a β-glucosidase and an endoglucanase.

The recombinant pressure can develop on cellooligosaccharides as much as at the very least cellooctaose and effectively metabolizes them to L-LA in single-step fermentation.

This is the primary report of a LAB in a position to instantly metabolize cellooligosaccharides longer that cellohexaose and a big step towards cost-sustainable consolidated bioprocessing of cellulose into optically pure LA.

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