Rajesh Rajesh Ambat

20080076910, Mar 27, 2008

Sep 19, 2007

11/857468

SUDHAKAR TAKKELLAPATI - BELLE MEAD NJ, US
RAJESH AMBAT - EDISON NJ, US

GE HEALTHCARE BIO-SCIENCES CORP. - PISCATAWAY NJ

C07H 21/00

536025400

The invention provides an improved method for the purification of nucleic acid molecules, which method comprises generating a cellular lysate containing the nucleic acid; contacting the lysate with an anion exchanger bound to a solid support matrix under conditions such that the anion exchanger binds the nucleic acid; followed by eluting the nucleic acid from the anion exchanger with an aqueous mobile phase comprising an elution solution; and desalting the eluted nucleic acid such that it is suitable for downstream applications. The improvement of the method includes adding in the elution solution a composition such that the pH of the aqueous mobile phase is between about pH 9 and about pH 13, wherein the presence of the composition in the elution solution provides an increase in nucleic acid recovery, as compared with the recovery in the absence of the composition.

20080076911, Mar 27, 2008

Sep 19, 2007

11/857727

SIBYLLE HERZER - FLEMINGTON NJ, US
SUDHAKAR RAO TAKKELLAPATI - BELLE MEAD NJ, US
RAJESH AMBAT - EDISON NJ, US

GE HEALTHCARE BIO-SCIENCES CORP. - PISCATAWAY NJ

C07H 21/00

536 254

Disclosed is a process for separating and/or purifying a nucleic acid by elution of the nucleic acid from anion exchange resins under conditions of high salt concentration and the presence in the eluant of an additive comprising guanidine, or a guanidine-like derivative. The process allows high recovery of nucleic acids from anion exchange resins without impairing the nucleic acid stability as compared with conventional ion exchange chromatographic procedures.

20080076912, Mar 27, 2008

Sep 19, 2007

11/857882

SUDHAKAR RAO TAKKELLAPATI - BELLE MEAD NJ, US
RAJESH AMBAT - EDISON NJ, US

GE HEALTHCARE BIO-SCIENCES CORP. - PISCATAWAY NJ

C07H 21/00

536 254

The invention provides an improved method for the purification of nucleic acid molecules, which method comprises generating a cellular lysate containing the nucleic acid; contacting the lysate with an anion exchanger bound to a solid support matrix under conditions such that the anion exchanger binds the nucleic acid; followed by eluting the nucleic acid from the anion exchanger with an aqueous mobile phase comprising an elution solution; and desalting the eluted nucleic acid such that it is suitable for downstream applications. The improvement of the method includes providing the anion exchanger in a packed column, wherein the column is packed using a salt solution containing an antimicrobial agent. In addition, the salt solution has a salt concentration similar to that of the lysate, such that the column does not need equilibration prior to sample loading.

20110152510, Jun 23, 2011

Aug 21, 2009

13/059992

Sudhakar Rao Takkellapati - Walpole MA, US
Manzer Khan - Union NJ, US
Rajesh Ambat - Edison NJ, US

GE HEALTHCARE BIO-SCIENCES CORP. - PISCATAWAY NJ

C07H 21/04

536 231

Provided is a novel two step chromatographic purification process (load and elute) for the isolation of genomic DNA. In this method the sample is loaded on the column and the genomic DNA product is eluted directly without any intermediate wash steps. This is accomplished by utilizing a restricted access resin (i.e., lid beads), which is easy to prepare and comprised of two layers with different properties with non-functional surfaces on the outer layer. The inner layer is modified with functional groups that act as ion-exchangers. Small molecules such as RNA and proteins can enter the inner part of the resin and larger genomic DNA molecules will pass through the resin. RNA and proteins are captured in the inner layer of the restricted access resin while genomic DNA is readily eluted in the flow-through.