ABSTRACT: A novel TiO2-based SPE strategy was developed for
eliminating normal ribonucleosides before mass spectrometry
(MS) analysis of 2′-deoxynucleosides and 2′-O-modified ribonucleosides.
The chromatographic research for the retention behavior
of ribonucleosides and 2′-deoxynucleosides on TiO2 materials was
investigated using TiO2 separation column. The results indicated a
specific affinity interaction mechanism between TiO2 and cis-diolcontaining
ribonucleosides, and the interaction was proved
effective even under a wide range of pH conditions and salt
concentrations. Benefiting from these features, a TiO2-based solid
phase extraction (SPE) method was developed for highly efficient
elimination of RNA contamination from genomic DNA.
Compared with the widely used enzymatic digestion method, the
proposed TiO2-based SPE method showed much more efficiency for the removal of RNA as well as provided high recoveries for
the 2′-deoxynucleosides. In addition, the sample processing time is dramatically shortened using the TiO2-based SPE method
(∼5 min) compared to the traditional enzymatic digestion method (∼12 h). Finally, the purification of 2′-O-methylated
ribonucleosides from RNA was successfully achieved in HeLa cells by the TiO2-based SPE method, which provided a proof-ofconcept
for the purification of relevant modified ribonucleosides from bulky normal ribonucleosides. Taken together, this
strategy developed in the current study offers a promising option to purify 2′-deoxynucleosides/2′-O-modified ribonucleosides
for their sensitive and accurate determination by eliminating normal ribonucleosides in biological samples
ABSTRACT: A novel TiO2-based SPE strategy was developed for
eliminating normal ribonucleosides before mass spectrometry
(MS) analysis of 2′-deoxynucleosides and 2′-O-modified ribonucleosides.
The chromatographic research for the retention behavior
of ribonucleosides and 2′-deoxynucleosides on TiO2 materials was
investigated using TiO2 separation column. The results indicated a
specific affinity interaction mechanism between TiO2 and cis-diolcontaining
ribonucleosides, and the interaction was proved
effective even under a wide range of pH conditions and salt
concentrations. Benefiting from these features, a TiO2-based solid
phase extraction (SPE) method was developed for highly efficient
elimination of RNA contamination from genomic DNA.
Compared with the widely used enzymatic digestion method, the
proposed TiO2-based SPE method showed much more efficiency for the removal of RNA as well as provided high recoveries for
the 2′-deoxynucleosides. In addition, the sample processing time is dramatically shortened using the TiO2-based SPE method
(∼5 min) compared to the traditional enzymatic digestion method (∼12 h). Finally, the purification of 2′-O-methylated
ribonucleosides from RNA was successfully achieved in HeLa cells by the TiO2-based SPE method, which provided a proof-ofconcept
for the purification of relevant modified ribonucleosides from bulky normal ribonucleosides. Taken together, this
strategy developed in the current study offers a promising option to purify 2′-deoxynucleosides/2′-O-modified ribonucleosides
for their sensitive and accurate determination by eliminating normal ribonucleosides in biological samples
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