Patents by Inventor Alexandre Persat
Alexandre Persat has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10830732Abstract: Isotachophoresis (ITP) is exploited to control various aspects of chemical reactions. In a first aspect, at least one of the reactants of a chemical reaction is confined to an ITP zone, but the resulting product of the chemical reaction is separated from this ITP zone by the ITP process. In a second aspect, one or more reactants of a chemical reaction are confined to an ITP zone, and one or more other reactants of the chemical reaction are not confined to this ITP zone. In a third aspect, ITP is employed to confine at least one reactant of a chemical reaction to an ITP zone, and at least one reactant of the chemical reaction is delivered to the ITP zone in two or more discrete doses. These aspects are especially relevant to performing polymerase chain reactions using chemical denaturants as opposed to thermal cycling.Type: GrantFiled: September 4, 2018Date of Patent: November 10, 2020Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Juan G. Santiago, Alexandre Persat
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Publication number: 20190271661Abstract: Techniques for enhanced isotachophoresis assays using additives with spatial gradients include forming a concentration gradient of an additive along a channel from an input port to an output port. The channel is used for isotachophoresis with ions of a leading electrolyte having a first mobility greater than a mobility of an analyte, and ions of a trailing electrolyte having a second mobility less than the mobility of the analyte. The additive is different from both the leading electrolyte and the trailing electrolyte; and the additive has a third mobility that assures the analyte will encounter the additive. The method further comprises introducing a mixture of the trailing electrolyte and a sample including the analyte. The method further comprises applying an electric field to the channel; and, measuring the analyte.Type: ApplicationFiled: November 16, 2018Publication date: September 5, 2019Applicant: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Juan G. Santiago, Alexandre Persat, Giancarlo Garcia, Charbel Eid
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Publication number: 20180372682Abstract: Isotachophoresis (ITP) is exploited to control various aspects of chemical reactions. In a first aspect, at least one of the reactants of a chemical reaction is confined to an ITP zone, but the resulting product of the chemical reaction is separated from this ITP zone by the ITP process. In a second aspect, one or more reactants of a chemical reaction are confined to an ITP zone, and one or more other reactants of the chemical reaction are not confined to this ITP zone. In a third aspect, ITP is employed to confine at least one reactant of a chemical reaction to an ITP zone, and at least one reactant of the chemical reaction is delivered to the ITP zone in two or more discrete doses. These aspects are especially relevant to performing polymerase chain reactions using chemical denaturants as opposed to thermal cycling.Type: ApplicationFiled: September 4, 2018Publication date: December 27, 2018Inventors: Juan G. Santiago, Alexandre Persat
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Patent number: 10132775Abstract: Techniques for enhanced isotachophoresis assays using additives with spatial gradients include forming a concentration gradient of an additive along a channel from an input port to an output port. The channel is used for isotachophoresis with ions of a leading electrolyte having a first mobility greater than a mobility of an analyte, and ions of a trailing electrolyte having a second mobility less than the mobility of the analyte. The additive is different from both the leading electrolyte and the trailing electrolyte; and the additive has a third mobility that assures the analyte will encounter the additive. The method further comprises introducing a mixture of the trailing electrolyte and a sample including the analyte. The method further comprises applying an electric field to the channel; and, measuring the analyte.Type: GrantFiled: August 17, 2015Date of Patent: November 20, 2018Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Juan G. Santiago, Alexandre Persat, Giancarlo Garcia, Charbel Eid
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Patent number: 10073054Abstract: Isotachophoresis (ITP) is exploited to control various aspects of chemical reactions. In a first aspect, at least one of the reactants of a chemical reaction is confined to an ITP zone, but the resulting product of the chemical reaction is separated from this ITP zone by the ITP process. In a second aspect, one or more reactants of a chemical reaction are confined to an ITP zone, and one or more other reactants of the chemical reaction are not confined to this ITP zone. In a third aspect, ITP is employed to confine at least one reactant of a chemical reaction to an ITP zone, and at least one reactant of the chemical reaction is delivered to the ITP zone in two or more discrete doses. These aspects are especially relevant to performing polymerase chain reactions using chemical denaturants as opposed to thermal cycling.Type: GrantFiled: March 25, 2016Date of Patent: September 11, 2018Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Juan G. Santiago, Alexandre Persat
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Patent number: 9753007Abstract: A method and system are presented for fast and efficient isolation, purification and quantitation of nucleic acids from complex biological samples using isotachophoresis in microchannels. In an embodiment, a sieving medium may be used to enhance selectivity. In another embodiment, PCR-friendly chemistries are used to purify nucleic acids from complex biological samples and yield nucleic acids ready for further analysis including for PCR. In another embodiment, small RNAs from biological samples are extracted, isolated, preconcentrated and quantitated using on-chip ITP with a high efficiency sieving medium. The invention enables fast concentration and separation (takes 10s to 100s of seconds) of nucleic acids with high selectivity and using lower volumes of reagents (order of 10s of ?L to focus less than 1 ?g/?L of nucleic acid).Type: GrantFiled: September 25, 2014Date of Patent: September 5, 2017Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Robert D. Chambers, Juan G. Santiago, Alexandre Persat, Reto B. Schoch, Mostafa Ronaghi
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Publication number: 20160209360Abstract: Isotachophoresis (ITP) is exploited to control various aspects of chemical reactions. In a first aspect, at least one of the reactants of a chemical reaction is confined to an ITP zone, but the resulting product of the chemical reaction is separated from this ITP zone by the ITP process. In a second aspect, one or more reactants of a chemical reaction are confined to an ITP zone, and one or more other reactants of the chemical reaction are not confined to this ITP zone. In a third aspect, ITP is employed to confine at least one reactant of a chemical reaction to an ITP zone, and at least one reactant of the chemical reaction is delivered to the ITP zone in two or more discrete doses. These aspects are especially relevant to performing polymerase chain reactions using chemical denaturants as opposed to thermal cycling.Type: ApplicationFiled: March 25, 2016Publication date: July 21, 2016Inventors: Juan G. Santiago, Alexandre Persat
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Publication number: 20160153934Abstract: Techniques for enhanced isotachophoresis assays using additives with spatial gradients include forming a concentration gradient of an additive along a channel from an input port to an output port. The channel is used for isotachophoresis with ions of a leading electrolyte having a first mobility greater than a mobility of an analyte, and ions of a trailing electrolyte having a second mobility less than the mobility of the analyte. The additive is different from both the leading electrolyte and the trailing electrolyte; and the additive has a third mobility that assures the analyte will encounter the additive. The method further comprises introducing a mixture of the trailing electrolyte and a sample including the analyte. The method further comprises applying an electric field to the channel; and, measuring the analyte.Type: ApplicationFiled: August 17, 2015Publication date: June 2, 2016Applicant: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Juan G. Santiago, Alexandre Persat, Giancarlo Garcia, Charbel Eid
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Patent number: 9297039Abstract: Isotachophoresis (ITP) is exploited to control various aspects of chemical reactions. In a first aspect, at least one of the reactants of a chemical reaction is confined to an ITP zone, but the resulting product of the chemical reaction is separated from this ITP zone by the ITP process. In a second aspect, one or more reactants of a chemical reaction are confined to an ITP zone, and one or more other reactants of the chemical reaction are not confined to this ITP zone. In a third aspect, ITP is employed to confine at least one reactant of a chemical reaction to an ITP zone, and at least one reactant of the chemical reaction is delivered to the ITP zone in two or more discrete doses. These aspects are especially relevant to performing polymerase chain reactions using chemical denaturants as opposed to thermal cycling.Type: GrantFiled: August 21, 2014Date of Patent: March 29, 2016Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Juan G. Santiago, Alexandre Persat
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Patent number: 9151732Abstract: Techniques for enhanced isotachophoresis assays using additives with spatial gradients include forming a concentration gradient of an additive along a channel from an input port to an output port. The channel is used for isotachophoresis with ions of a leading electrolyte having a first mobility greater than a mobility of an analyte, and ions of a trailing electrolyte having a second mobility less than the mobility of the analyte. The additive is different from both the leading electrolyte and the trailing electrolyte; and the additive has a third mobility that assures the analyte will encounter the additive. The method further comprises introducing a mixture of the trailing electrolyte and a sample including the analyte. The method further comprises applying an electric field to the channel; and, measuring the analyte.Type: GrantFiled: October 3, 2011Date of Patent: October 6, 2015Assignee: THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIVERSITYInventors: Juan G. Santiago, Alexandre Persat, Giancarlo Garcia, Charbel Eid
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Patent number: 8999129Abstract: The present invention provides a mechanism for separating or isolating charged particles under the influence of an electric field without metal electrodes being in direct contact with the sample solution. The metal electrodes normally in contact with the sample are replaced with high conductivity fluid electrodes situated parallel and adjacent to the sample. When the fluid electrodes transmit the electric field across the sample, particles within the sample migrate according to their electrophoretic mobility.Type: GrantFiled: March 6, 2012Date of Patent: April 7, 2015Assignees: Lawrence Livermore National Security, LLC, The Board of Trustees of the Leland Stanford Junior UniversityInventors: Byoungsok Jung, Klint A. Rose, Maxim Shusteff, Alexandre Persat, Juan Santiago
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Publication number: 20140360879Abstract: Isotachophoresis (ITP) is exploited to control various aspects of chemical reactions. In a first aspect, at least one of the reactants of a chemical reaction is confined to an ITP zone, but the resulting product of the chemical reaction is separated from this ITP zone by the ITP process. In a second aspect, one or more reactants of a chemical reaction are confined to an ITP zone, and one or more other reactants of the chemical reaction are not confined to this ITP zone. In a third aspect, ITP is employed to confine at least one reactant of a chemical reaction to an ITP zone, and at least one reactant of the chemical reaction is delivered to the ITP zone in two or more discrete doses. These aspects are especially relevant to performing polymerase chain reactions using chemical denaturants as opposed to thermal cycling.Type: ApplicationFiled: August 21, 2014Publication date: December 11, 2014Inventors: Juan G. Santiago, Alexandre Persat
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Patent number: 8846314Abstract: A method and system are presented for fast and efficient isolation, purification and quantitation of nucleic acids from complex biological samples using isotachophoresis in microchannels. In an embodiment, a sieving medium may be used to enhance selectivity. In another embodiment, PCR-friendly chemistries are used to purify nucleic acids from complex biological samples and yield nucleic acids ready for further analysis including for PCR. In another embodiment, small RNAs from biological samples are extracted, isolated, preconcentrated and quantitated using on-chip ITP with a high efficiency sieving medium. The invention enables fast concentration and separation (takes 10s to 100s of seconds) of nucleic acids with high selectivity and using lower volumes of reagents (order of 10s of ?L to focus less than 1 pg/?L of nucleic acid).Type: GrantFiled: March 2, 2010Date of Patent: September 30, 2014Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Robert D. Chambers, Juan G. Santiago, Alexandre Persat, Reto B. Schoch, Mostafa Ronaghi
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Patent number: 8821704Abstract: Isotachophoresis (ITP) is exploited to control various aspects of chemical reactions. In a first aspect, at least one of the reactants of a chemical reaction is confined to an ITP zone, but the resulting product of the chemical reaction is separated from this ITP zone by the ITP process. In a second aspect, one or more reactants of a chemical reaction are confined to an ITP zone, and one or more other reactants of the chemical reaction are not confined to this ITP zone. In a third aspect, ITP is employed to confine at least one reactant of a chemical reaction to an ITP zone, and at least one reactant of the chemical reaction is delivered to the ITP zone in two or more discrete doses. These aspects are especially relevant to performing polymerase chain reactions using chemical denaturants as opposed to thermal cycling.Type: GrantFiled: February 11, 2013Date of Patent: September 2, 2014Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Juan G. Santiago, Alexandre Persat
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Publication number: 20140014515Abstract: Techniques for enhanced isotachophoresis assays using additives with spatial gradients include forming a concentration gradient of an additive along a channel from an input port to an output port. The channel is used for isotachophoresis with ions of a leading electrolyte having a first mobility greater than a mobility of an analyte, and ions of a trailing electrolyte having a second mobility less than the mobility of the analyte. The additive is different from both the leading electrolyte and the trailing electrolyte; and the additive has a third mobility that assures the analyte will encounter the additive. The method further comprises introducing a mixture of the trailing electrolyte and a sample including the analyte. The method further comprises applying an electric field to the channel; and, measuring the analyte.Type: ApplicationFiled: October 3, 2011Publication date: January 16, 2014Applicant: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Juan G. Santiago, Alexandre Persat, Giancarlo Garcia, Charbel Eid
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Patent number: 8524061Abstract: Isotachophoresis (ITP) can be employed to simultaneously focus the target and ligand of an assay into the same ITP focus zone. The target and ligand can bind to each other in the ITP focus zone, and then the resulting bound complex can be detected (e.g., by fluorescence). The sensitivity of this approach can be greatly increased by the enhanced concentration of both target and ligand that ITP provides in the focus zone. Since ITP can be performed quickly, the resulting assay is both rapid and sensitive. Markers of bacterial urinary tract infections have been experimentally detected at clinically relevant concentrations with this approach. MicroRNA sequences have also been profiled with this approach, which is clinically relevant because MicroRNA is expected to provide useful markers for disease. In one experiment, miR-122 in human kidney and liver was detected and quantified.Type: GrantFiled: November 29, 2011Date of Patent: September 3, 2013Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Paul J. Utz, Juan G. Santiago, Michael G. Kattah, Alexandre Persat
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Patent number: 8394251Abstract: Isotachophoresis (ITP) is exploited to control various aspects of chemical reactions. In a first aspect, at least one of the reactants of a chemical reaction is confined to an ITP zone, but the resulting product of the chemical reaction is separated from this ITP zone by the ITP process. In a second aspect, one or more reactants of a chemical reaction are confined to an ITP zone, and one or more other reactants of the chemical reaction are not confined to this ITP zone. In a third aspect, ITP is employed to confine at least one reactant of a chemical reaction to an ITP zone, and at least one reactant of the chemical reaction is delivered to the ITP zone in two or more discrete doses. These aspects are especially relevant to performing polymerase chain reactions using chemical denaturants as opposed to thermal cycling.Type: GrantFiled: October 7, 2009Date of Patent: March 12, 2013Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Juan G. Santiago, Alexandre Persat
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Publication number: 20120228141Abstract: The present invention provides a mechanism for separating or isolating charged particles under the influence of an electric field without metal electrodes being in direct contact with the sample solution. The metal electrodes normally in contact with the sample are replaced with high conductivity fluid electrodes situated parallel and adjacent to the sample. When the fluid electrodes transmit the electric field across the sample, particles within the sample migrate according to their electrophoretic mobility.Type: ApplicationFiled: March 6, 2012Publication date: September 13, 2012Inventors: Byoungsok Jung, Klint A. Rose, Maxim Shusteff, Alexandre Persat, Juan Santiago
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Publication number: 20120160689Abstract: Isotachophoresis (ITP) can be employed to simultaneously focus the target and ligand of an assay into the same ITP focus zone. The target and ligand can bind to each other in the ITP focus zone, and then the resulting bound complex can be detected (e.g., by fluorescence). The sensitivity of this approach can be greatly increased by the enhanced concentration of both target and ligand that ITP provides in the focus zone. Since ITP can be performed quickly, the resulting assay is both rapid and sensitive. Markers of bacterial urinary tract infections have been experimentally detected at clinically relevant concentrations with this approach. MicroRNA sequences have also been profiled with this approach, which is clinically relevant because MicroRNA is expected to provide useful markers for disease. In one experiment, miR-122 in human kidney and liver was detected and quantified.Type: ApplicationFiled: November 29, 2011Publication date: June 28, 2012Inventors: Paul J. Utz, Juan G. Santiago, Michael G. Kattah, Alexandre Persat
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Publication number: 20100224494Abstract: A method and system are presented for fast and efficient isolation, purification and quantitation of nucleic acids from complex biological samples using isotachophoresis in microchannels. In an embodiment, a sieving medium may be used to enhance selectivity. In another embodiment, PCR-friendly chemistries are used to purify nucleic acids from complex biological samples and yield nucleic acids ready for further analysis including for PCR. In another embodiment, small RNAs from biological samples are extracted, isolated, preconcentrated and quantitated using on-chip ITP with a high efficiency sieving medium. The invention enables fast concentration and separation (takes 10s to 100s of seconds) of nucleic acids with high selectivity and using lower volumes of reagents (order of 10s of ?L to focus less than 1 pg/?L of nucleic acid).Type: ApplicationFiled: March 2, 2010Publication date: September 9, 2010Applicant: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Robert D. Chambers, Juan G. Santiago, Alexandre Persat, Reto B. Schoch, Mostafa Ronaghi