Patent Publication Number: US-2021170305-A1

Title: Liquid chromatography technique

Description:
PRIORITY 
     The present application is a continuation application, which claims priority and benefit of Non-Provisional patent application Ser. No. 16/971,216, currently pending, which is a 371 National Stage Application of International Application PCT/US2019/019209, titled “LIQUID CHROMATOGRAPHY TECHNIQUE”, filed Feb. 22, 2019, which claims priority and benefit of U.S. Provisional Patent Application No. 62/634,299, filed Feb. 23, 2018, and titled “LIQUID CHROMATOGRAPHY TECHNIQUE,” each of which are incorporated by reference in tehri entirety. 
    
    
     FIELD OF THE INVENTION 
     The present invention is directed to liquid chromatography techniques. More particularly, the present invention is directed to liquid chromatography techniques utilizing a coated metallic fluid-contacting element. 
     BACKGROUND OF THE INVENTION 
     Analytical instrumentation is a constantly evolving field. There are constant desires to become quicker, smaller, more precise, and more accurate. However, such desires create limitations that have not been physically possible with existing materials. 
     For example, titanium is used in high performance (or pressure) liquid chromatography (HPLC). However, under certain conditions, titanium is incompatible with ammonia, chlorine (both wet and dry), HCl, nitrating acid (nitric and sulfuric combination), phosphoric acid, sodium and potassium hydroxide, bleach, and sulfuric acid. Titanium is also brittle, limiting the ability to bend it, for example, into tubing. Also, titanium is very expensive, resulting it being unavailable for cost-effective techniques. 
     In contrast, polyether ether ketone (PEEK) is flexible and inexpensive. However, PEEK has many other drawbacks. Under certain conditions, PEEK is incompatible with benzene sulfonic acid, chlorine (both wet and dry), nitric acid, sulfuric acid, carbolic acid, ultraviolet light, methylene chloride, dimethylsulfate, tetrahydrofuran, and other organic solvents. PEEK also has an upper temperature limit of between 100° C. and 143° C., depending upon the application. 
     A liquid chromatography technique, system, and components, that show one or more improvements in comparison to the prior art would be desirable in the art. 
     BRIEF DESCRIPTION OF THE INVENTION 
     In an embodiment, a liquid chromatography technique includes providing a liquid chromatography system having a coated metallic fluid-contacting element, and transporting a fluid to contact the coated metallic fluid-contacting element. Conditions for the transporting of the fluid are selected from the group consisting of the temperature of the fluid being greater than 150° C., pressure urging the fluid being greater than 60 MPa, the fluid having a protein-containing analyte incompatible with one or both of titanium and polyether ether ketone, the fluid having a chelating agent incompatible with the one or both of the titanium or the polyether ether ketone, and combinations thereof. 
     In another embodiment, a liquid chromatography technique includes providing a liquid chromatography system having a coated metallic column, a degasser, a sample, one or more pumps, and a detector. The liquid chromatography technique further includes transporting a fluid through the coated metallic column, wherein conditions for the transporting of the fluid include one or both of the fluid having a protein-containing analyte incompatible with one or both of titanium and polyether ether ketone, and the fluid having a chelating agent incompatible with the one or both of the titanium or the polyether ether ketone. 
     In another embodiment, a liquid chromatography technique includes providing a liquid chromatography system having a coated metallic column, a stationary phase being positioned within the coated metallic column, the stationary phase including particles having a size of less than 1.5 micrometers. The liquid chromatography technique further includes transporting a fluid through the coated metallic column, wherein conditions for the transporting of the fluid include the temperature of the fluid being greater than 150° C., pressure urging the fluid within the coated metallic column being greater than 60 MPa, the fluid having a protein-containing analyte incompatible with one or both of titanium and polyether ether ketone, the fluid having a chelating agent incompatible with the one or both of the titanium or the polyether ether ketone, and combinations thereof. The coated metallic column has a coating including carbon, silicon, oxygen, and hydrogen, and a stainless steel substrate, the pH of the fluid is less than 2, the coated metallic column has a diameter of less than 2.1 mm, the coated metallic column has a length of less than 20 cm, and the coated metallic component has a coating having a thickness of at least 400 nm. The transporting of the fluid through the coated metallic column is at a linear velocity of at least 8 mm per second. The fluid includes a solvent selected from the group consisting of water, acetonitrile, methanol, formic acid, phosphoric acid, tetrahydrofuran, trifluoroacetic acid, and combinations thereof. The fluid includes an analyte selected from the group consisting of tetracycline, N-hydroxypyridine-2-on, adenosine triphosphate, and deoxynucleotide monophosphate. 
     Other features and advantages of the present invention will be apparent from the following more detailed description, taken in conjunction with the accompanying drawings which illustrate, by way of example, the principles of the invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic view of a liquid chromatography system for performing an embodiment of a liquid chromatography technique, according to the disclosure. 
         FIG. 2  is a schematic perspective view of a column for a liquid chromatography system capable of performing an embodiment of the liquid chromatography technique, according to the disclosure. 
     
    
    
     Wherever possible, the same reference numbers will be used throughout the drawings to represent the same parts. 
     DETAILED DESCRIPTION OF THE INVENTION 
     Provided are liquid chromatography techniques, systems, and components. Embodiments of the present disclosure, for example, in comparison to concepts failing to include one or more of the features disclosed herein, expands the capabilities of liquid chromatography, permits increased precision of liquid chromatography, permits increased accuracy of liquid chromatography, permits decreased sizes of columns to be used in liquid chromatography, permits reduced duration of analysis for liquid chromatography, permits bioinert and/or protein anti-stiction operation of liquid chromatography, permits operations with fluids incompatible with titanium under certain conditions (for example, ammonia, chlorine (both wet and dry), HC 1 , nitrating acid (nitric and sulfuric combination), phosphoric acid, sodium and potassium hydroxide, bleach, and sulfuric acid), permits operation with fluids incompatible with polyether ether ketone (for example, benzene sulfonic acid, chlorine (both wet and dry), nitric acid, sulfuric acid, carbolic acid, ultraviolet light, methylene chloride, dim ethyl sulfate, tetrahydrofuran, and other organic solvents), permits liquid chromatography to be performed at higher pressures, permits liquid chromatography to be performed at higher temperatures, permits liquid chromatography to be performed with smaller particles in the stationary phase, permits liquid chromatography to be performed with smaller diameter and/or length columns, or permit a combinations thereof. 
     Referring to  FIG. 1 , a liquid chromatography technique, utilizing a liquid chromatography system  100 , is disclosed. It will be appreciated by those skilled in the art that the liquid chromatography technique is capable of being used with any suitable configuration of the liquid chromatography system  100 . Such suitable configurations include, but are not limited to high performance (or pressure) liquid chromatography (HPLC), ultra high performance (or pressure) liquid chromatography (UHPLC), partitioned HPLC or UHPLC, normal-phase chromatography, displacement chromatography, reversed-phase chromatography, size exclusion chromatography, ion-exchange chromatography, or a combination thereof. 
     Referring again to  FIG. 1 , an exemplary system  100  includes solvent reservoirs  101 , a solvent degasser  102 , a gradient valve  103 , a mixing vessel  104  for delivery of a mobile phase, a high-pressure pump  105 , switching valves  106  in injection position or loading position, a sample injection loop  107 , a pre-column portion  108 , a coated metallic column  109 , a detector  110  (for example, an infrared detector or ultraviolet detector), a data acquisition system  111  (for example, a computer), and a waste or fraction collector  112 . Any additional or alternative components are capable of being used, so long as the system  100  includes a coated metallic fluid-contacting element, such as the coated metallic column  109 , or any other component of the system  100  that is contacted by a fluid, such as, a mobile phase, a solvent, an analyte, or a combination thereof Additionally or alternatively, other components are capable of being similarly coated, such as, frits, fittings, pump heads, valves, tubing, vessels, or combinations thereof. 
     Referring to  FIG. 2 , in one embodiment, the coated metallic column  109  contains particles  205  or beads. The particles  205  serve as a stationary phase during the liquid chromatography technique. The particles  205  have a size (for example, a diameter and/or width) that is less than 10 micrometers, less than 6 micrometers, less than 5 micrometers, less than 3 micrometers, less than 2 micrometers, less than 1.7 micrometers, less than 1.5 micrometers, between 1 micrometer and 10 micrometers, between 1 micrometer and 5 micrometers, between 1 micrometer and 3 micrometers, between 1 micrometer and 2 micrometers, 0.67 micrometers, less than 0.67 micrometers, or any suitable combination, sub-combination, range, or sub-range therein. In one embodiment, the particles  205  are hydrophobic and/or porous. A coating  203  on the coated metallic column  109  permits the particles  205  having such dimensions and features to be used during the liquid chromatography technique. Suitable thicknesses of the coating  203  include, but are not limited to, at least 50 nm, at least 100 nm, at least 200 nm, at least 300 nm, at least 400 nm, at least 600 nm, at least 800 nm, at least 1,000 nm, at least 1,200 nm, between 50 nm and 1,600 nm, between 400 nm and 1,600 nm, between 1,000 nm and 1,600 nm, or any suitable combination, sub-combination, range, or sub-range therein. 
     Suitable lengths for the coated metallic column  109  include, but are limited to, between 10 cm and 20 cm, between 10 cm and 50 cm, 15 cm, greater than 10 cm, greater than 14 cm, less than 20 cm, less than 16 cm, between 10 cm and 400 cm, between 10 cm and 100 cm, greater than 100 cm, greater than 250 cm, or any suitable combination, sub-combination, range, or sub-range therein. 
     Suitable diameters (or widths) for the coated metallic column  109  include, but are limited to, less than 2.1 mm, less than 1.7 cm, less than 1.5 cm, less than 0.3 mm, or any suitable combination, sub-combination, range, or sub-range therein. 
     The coated metallic column  109  includes a substrate  201  and the coating  203 . The substrate  201  is a metallic material, such as stainless steel. Suitable stainless steels include  304  stainless steel and  316  stainless steel. Any other metallic material compatible with the operational conditions of the liquid chromatography technique are suitable. Suitable metallic materials include, but are not limited to, ferrous-based alloys, non-ferrous-based alloys, nickel-based alloys, stainless steels (martensitic or austenitic), aluminum alloys, composite metals, or combinations thereof. 
     In one embodiment, the metallic material is or includes a composition, by weight, of up to 0.08% carbon, between 18% and 20% chromium, up to 2% manganese, between 8% and 10.5% nickel, up to 0.045% phosphorus, up to 0.03% sulfur, up to 1% silicon, and a balance of iron (for example, between 66% and 74% iron). 
     In one embodiment, the metallic material is or includes a composition, by weight, of up to 0.08% carbon, up to 2% manganese, up to 0.045% phosphorus, up to 0.03% sulfur, up to 0.75% silicon, between 16% and 18% chromium, between 10% and 14% nickel, between 2% and 3% molybdenum, up to 0.1% nitrogen, and a balance of iron. 
     In one embodiment, the metallic material is or includes a composition, by weight, of up to 0.03% carbon, up to 2% manganese, up to 0.045% phosphorus, up to 0.03% sulfur, up to 0.75% silicon, between 16% and 18% chromium, between 10% and 14% nickel, between 2% and 3% molybdenum, up to 0.1% nitrogen, and a balance of iron. 
     In one embodiment, the metallic material is or includes a composition, by weight, of between 14% and 17% chromium, between 6% and 10% iron, between 0.5% and 1.5% manganese, between 0.1% and 1% copper, between 0.1% and 1% silicon, between 0.01% and 0.2% carbon, between 0.001% and 0.2% sulfur, and a balance nickel (for example, 72%). 
     In one embodiment, the metallic material is or includes a composition, by weight, of between 20% and 24% chromium, between 1% and 5% iron, between 8% and 10% molybdenum, between 10% and 15% cobalt, between 0.1% and 1% manganese, between 0.1% and 1% copper, between 0.8% and 1.5% aluminum, between 0.1% and 1% titanium, between 0.1% and 1% silicon, between 0.01% and 0.2% carbon, between 0.001% and 0.2% sulfur, between 0.001% and 0.2% phosphorus, between 0.001% and 0.2% boron, and a balance nickel (for example, between 44.2% and 56%). 
     In one embodiment, the metallic material is or includes a composition, by weight, of between 20% and 23% chromium, between 4% and 6% iron, between 8% and 10% molybdenum, between 3% and 4.5% niobium, between 0.5% and 1.5% cobalt, between 0.1% and 1% manganese, between 0.1% and 1% aluminum, between 0.1% and 1% titanium, between 0.1% and 1% silicon, between 0.01% and 0.5% carbon, between 0.001% and 0.02% sulfur, between 0.001% and 0.02% phosphorus, and a balance nickel (for example, 58%). 
     In one embodiment, the metallic material is or includes a composition, by weight, of between 25% and 35% chromium, between 8% and 10% iron, between 0.2% and 0.5% manganese, between 0.005% and 0.02% copper, between 0.01% and 0.03% aluminum, between 0.3% and 0.4% silicon, between 0.005% and 0.03% carbon, between 0.001% and 0.005% sulfur, and a balance nickel (for example, 59.5%). 
     In one embodiment, the metallic material is or includes a composition, by weight, of between 17% and 21% chromium, between 2.8% and 3.3% iron, between 4.75% and 5.5% niobium, between 0.5% and 1.5% cobalt, between 0.1% and 0.5% manganese, between 0.2% and 0.8% copper, between 0.65% and 1.15% aluminum, between 0.2% and 0.4% titanium, between 0.3% and 0.4% silicon, between 0.01% and 1% carbon, between 0.001 and 0.02% sulfur, between 0.001 and 0.02% phosphorus, between 0.001 and 0.02% boron, and a balance nickel (for example, between 50% and 55%). 
     In one embodiment, the metallic material is or includes a composition, by weight, of between 2% and 3% cobalt, between 15% and 17% chromium, between 5% and 17% molybdenum, between 3% and 5% tungsten, between 4% and 6% iron, between 0.5% and 1% silicon, between 0.5% and 1.5% manganese, between 0.005 and 0.02% carbon, between 0.3% and 0.4% vanadium, and a balance nickel. 
     In one embodiment, the metallic material is or includes a composition, by weight, of up to 0.15% carbon, between 3.5% and 5.5% tungsten, between 4.5% and 7% iron, between 15.5% and 17.5% chromium, between 16% and 18% molybdenum, between 0.2% and 0.4% vanadium, up to 1% manganese, up to 1% sulfur, up to 1% silicon, up to 0.04% phosphorus, up to 0.03% sulfur, and a balance nickel. 
     In one embodiment, the metallic material is or includes a composition, by weight, of up to 2.5% cobalt, up to 22% chromium, up to 13% molybdenum, up to 3% tungsten, up to 3% iron, up to 0.08% silicon, up to 0.5% manganese, up to 0.01% carbon, up to 0.35% vanadium, and a balance nickel (for example, 56%). 
     In one embodiment, the metallic material is or includes a composition, by weight, of between 1% and 2% cobalt, between 20% and 22% chromium, between 8% and 10% molybdenum, between 0.1% and 1% tungsten, between 17% and 20% iron, between 0.1% and 1% silicon, between 0.1% and 1% manganese, between 0.05 and 0.2% carbon, and a balance nickel. 
     In one embodiment, the metallic material is or includes a composition, by weight, of between 0.01% and 0.05% boron, between 0.01% and 0.1% chromium, between 0.003% and 0.35% copper, between 0.005% and 0.03% gallium, between 0.006% and 0.8% iron, between 0.006% and 0.3% magnesium, between 0.02% and 1% silicon+iron, between 0.006% and 0.35% silicon, between 0.002% and 0.2% titanium, between 0.01% and 0.03% vanadium+titanium, between 0.005% and 0.05% vanadium, between 0.006% and 0.1% zinc, and a balance aluminum (for example, greater than 99%). 
     In one embodiment, the metallic material is or includes a composition, by weight, of between 0.05% and 0.4% chromium, between 0.03% and 0.9% copper, between 0.05% and 1% iron, between 0.05% and 1.5% magnesium, between 0.5% and 1.8% manganese, between 0.5% and 0.1% nickel, between 0.03% and 0.35% titanium, up to 0.5% vanadium, between 0.04% and 1.3% zinc, and a balance aluminum (for example, between 94.3% and 99.8%). 
     In one embodiment, the metallic material is or includes a composition, by weight, of between 0.0003% and 0.07% beryllium, between 0.02% and 2% bismuth, between 0.01% and 0.25% chromium, between 0.03% and 5% copper, between 0.09% and 5.4% iron, between 0.01% and 2% magnesium, between 0.03% and 1.5% manganese, between 0.15% and 2.2% nickel, between 0.6% and 21.5% silicon, between 0.005% and 0.2% titanium, between 0.05% and 10.7% zinc, and a balance aluminum (for example, between 70.7% to 98.7%). 
     In one embodiment, the metallic material is or includes a composition, by weight, of between 0.15% and 1.5% bismuth, between 0.003% and 0.06% boron, between 0.03% and 0.4% chromium, between 0.01% and 1.2% copper, between 0.12% and 0.5% chromium+manganese, between 0.04% and 1% iron, between 0.003% and 2% lead, between 0.2% and 3% magnesium, between 0.02% and 1.4% manganese, between 0.05% and 0.2% nickel, between 0.5% and 0.5% oxygen, between 0.2% and 1.8% silicon, up to 0.05% strontium, between 0.05% and 2% tin, between 0.01% and 0.25% titanium, between 0.05% and 0.3% vanadium, between 0.03% and 2.4% zinc, between 0.05% and 0.2% zirconium, between 0.150 and 0.2% zirconium+titanium, and a balance of aluminum (for example, between 91.7% and 99.6%). 
     In one embodiment, the metallic material is or includes a composition, by weight, of between 0.4% and 0.8% silicon, up to 0.7% iron, between 0.15% and 0.4% copper, up to 0.15% manganese, between 0.8% and 1.2% magnesium, between 0.04% and 0.35% chromium, up to 0.25% zinc, up to 0.15% titanium, optional incidental impurities (for example, at less than 0.05% each, totaling less that 0.15%), and a balance of aluminum (for example, between 95% and 98.6%). 
     In one embodiment, the metallic material is or includes a composition, by weight, of between 11% and 13% silicon, up to 0.6% impurities/residuals, and a balance of aluminum. 
     The coating  203  includes one or a plurality of depositions, decompositions, functionalizations, oxidations, or a combination thereof. In one embodiment, the coating  203  includes carbon, silicon, oxygen, and hydrogen. In additional or alternative embodiments, other constituents in the coating  203  include, but are not limited to, fluorine, nitrogen, decompositional materials from precursor materials, thnctionalizations from precursor materials, or a combination thereof. Suitable precursor materials include, but are not limited to, silane, silane and ethylene, silane and an oxidizer, dimethylsilane, dimethylsilane and an oxidizer, trimethylsilane, trimethylsilane and an oxidizer, dialkylsilyl dihydride, alkylsilyl trihydride, non-pyrophoric species (for example, dialkylsilyl dihydride and/or alkylsilyl trihydride), thermally-reacted material (for example, carbosilane and/or carboxysilane, such as, amorphous carbosilane and/or amorphous carboxysilane), species capable of a recombination of carbosilyl (disilyl or trisilyl fragments), methyltrimethoxysilane, methyltriethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, trimethylmethoxysilane, trimethylethoxysilane, ammonia, hydrazine, trisilylamine, Bis(tertiary-butylamino)silane, 1,2-bis(dimethylamino)tetramethyldisilane, dichlorosilane, hexachlorodisilane), organofluorotrialkoxysilane, organofluorosilylhydride, organofluoro silyl, fluorinated alkoxysilane, fluoroalkylsilane, fluorosilane, tridecafluoro 1,1,2,2-tetrahydrooctylsilane, (tridecafluoro-1,1,2,2-tetrahydrooctyl) triethoxysilane, triethoxy (3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluoro-1-octyl) silane, (perfluorohexylethyl) triethoxysilane, silane (3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-heptadecafluorodecyl) trimethoxy-, or a combination thereof. 
     The liquid chromatography technique includes a fluid transported through the coated metallic column  109 , for example, passing through the particles  205  serving as the stationary phase for the liquid chromatography technique. The fluid is or includes the mobile phase, one or more solvents, one or more analytes, or a combination thereof Suitable species of the fluid include, but are not limited to a protein-containing analyte incompatible with one or both of titanium and polyether ether ketone and a chelating agent incompatible with the one or both of the titanium or the polyether ether ketone. Specific solvents capable of being used within the liquid chromatography technique include, but are not limited to, water, acetonitrile, methanol, formic acid, phosphoric acid, tetrahydrofuran, trifluoroacetic acid, and combinations thereof. Specific analytes capable of being used within the liquid chromatography technique include, but are not limited to, tetracycline, N-hydroxypyridine-2-on, adenosine triphosphate, and deoxynucleotide monophosphate. 
     In one embodiment, the liquid chromatography technique includes the fluid being at a temperature not suitable for polyether ether ketone and/or titanium, for example, in conjunction with other operational parameters of the liquid chromatography technique. Such temperatures include, but are not limited to, between 100° C. and 200° C., between 200° C. and 300° C., between 300° C. and 400° C., between 400° C. and 450° C., greater than 150° C., greater than 200° C., greater than 250° C., greater than 300° C., greater than 350° C., greater than 400° C., or any suitable combination, sub-combination, range, or sub-range therein. 
     In one embodiment, the liquid chromatography technique includes the fluid being urged by a pressure not suitable for polyether ether ketone and/or titanium, for example, in conjunction with other operational parameters of the liquid chromatography technique. Such pressures include, but are not limited to, between 10 MPa and 150 MPa, 30 Mpa and 150 MPa, 50 MPa and 100 MPa, between 100 MPa and 150 MPa, between 100 MPa and 200 MPa, or any suitable combination, sub-combination, range, or sub-range therein. 
     In one embodiment, the liquid chromatography technique includes the fluid being at a pH value not suitable for polyether ether ketone and/or titanium, for example, in conjunction with other operational parameters of the liquid chromatography technique. Such pH values include, but are not limited to, less than 3, less than 2, less than 1, greater than 9, greater than 10, greater than 12, between 0 and 3, between 9 and 14, between 0 and 14, or any suitable combination, sub-combination, range, or sub-range therein. 
     In one embodiment, the liquid chromatography technique includes the fluid being transported at a linear velocity not suitable for polyether ether ketone and/or titanium, for example, in conjunction with other operational parameters of the liquid chromatography technique. Such linear velocities include, but are not limited to, between 1 and 9 mm per second, between 3 and 9 mm per second, at least 3 mm per second, at least 8 mm per second, or any suitable combination, sub-combination, range, or sub-range therein. 
     While the invention has been described with reference to one or more embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out this invention, but that the invention will include all embodiments falling within the scope of the appended claims. In addition, all numerical values identified in the detailed description shall be interpreted as though the precise and approximate values are both expressly identified.