A combinatorial droplet microfluidic device integrated with mass spectrometry for enzyme screening

Ha, Noel S.; Onley, Jenny R.; Deng, Kai; Andeer, Peter; Bowen, Benjamin P.; Gupta, Kshitiz; Kim, Peter W.; Kuch, Nathaniel; Kutschke, Mark; Parker, Alex; Song, Fangchao; Fox, Brian; Adams, Paul D.; de Raad, Markus; Northen, Trent R.

doi:10.1039/d2lc00980c

Title: A combinatorial droplet microfluidic device integrated with mass spectrometry for enzyme screening

Journal Article · Tue Jul 04 00:00:00 EDT 2023 · Lab on a chip (Print)

DOI:https://doi.org/10.1039/d2lc00980c· OSTI ID:1994303

^[1];

^[2]; Deng, Kai ^[2]; Andeer, Peter ^[3]; Bowen, Benjamin P. ^[3];

^[1]; Kim, Peter W. ^[4];

^[5]; Kutschke, Mark ^[6];

^[6];

^[7]; Fox, Brian ^[5]; Adams, Paul D. ^[8];

^[3]; Northen, Trent R. ^[1]

Joint BioEnergy Institute (JBEI), Emeryville, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Joint BioEnergy Institute (JBEI), Emeryville, CA (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Joint BioEnergy Institute, Emeryville, CA, USA;Sandia National Laboratories, Livermore, California, USA
Univ. of Wisconsin, Madison, WI (United States); Great Lakes Bioenergy Research Center (GLBRC), Madison, WI (United States)
Univ. of Wisconsin, Madison, WI (United States)
Lawrence Berkeley National Laboratory, Berkeley, CA, USA
Joint BioEnergy Institute (JBEI), Emeryville, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)

Mass spectrometry (MS) enables detection of different chemical species with a very high specificity; however, it can be limited by its throughput. Integrating MS with microfluidics has a tremendous potential to improve throughput and accelerate biochemical research. In this work, we introduce Drop-NIMS, a combination of a passive droplet loading microfluidic device and a matrix-free MS laser desorption ionization technique called nanostructure-initiator mass spectrometry (NIMS). This platform combines different droplets at random to generate a combinatorial library of enzymatic reactions that are deposited directly on the NIMS surface without requiring additional sample handling. The enzyme reaction products are then detected with MS. Drop-NIMS was used to rapidly screen enzymatic reactions containing low (on the order of nL) volumes of glycoside reactants and glycoside hydrolase enzymes per reaction. MS “barcodes” (small compounds with unique masses) were added to the droplets to identify different combinations of substrates and enzymes created by the device. We assigned xylanase activities to several putative glycoside hydrolases, making them relevant to food and biofuel industrial applications. Overall, Drop-NIMS is simple to fabricate, assemble, and operate and it has potential to be used with many other small molecule metabolites.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: AC02-05CH11231; FC02-07ER64494; FC0207ER64494

OSTI ID:: 1994303

Alternate ID(s):: OSTI ID: 1988086

Journal Information:: Lab on a chip (Print), Vol. 23, Issue 15; ISSN 1473-0197

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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