Using surface-enhanced Raman scattering (SERS) and fluorescence spectroscopy for screening yeast extracts, a complex component of cell culture media
Date
2012Author
Ryder, Alan G.
Li, Boyan
Sirimithu, Narayana M.S.
Ray, Bryan H.
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Li, BY,Sirimuthu, NMS,Ray, BH,Ryder, AG (2012) 'Using surface-enhanced Raman scattering (SERS) and fluorescence spectroscopy for screening yeast extracts, a complex component of cell culture media'. Journal Of Raman Spectroscopy, 43 :1074-1082.
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Abstract
Yeastolate or yeast extract, which are hydrolysates produced by autolysis of yeast, are often employed as a raw material in the media used for industrial mammalian cell culture. The source and quality of yeastolate can significantly affect cell growth and production; however, analysis of these complex biologically derived materials is not straightforward. The best current method, liquid chromatographymass spectrometry (LC-MS), is time-consuming and requires extensive expertise. This study describes the use of surface-enhanced Raman scattering (SERS) and fluorescence excitationemission matrix (EEM) spectroscopy coupled with robust principal component analysis (ROBPCA) for the rapid and facile characterization and discrimination of yeast extracts in aqueous solution. SERS using silver colloids generates time-dependent signals, where adenine is the strongest contributor, and the spectra are stable and reproducible (< ~3%) at
180 minutes after mixing. Combining this spectral behavior with chemometric methods enables
SERS to be used for discriminating between different yeastolate sources, for assessing lot-to-lot
variability, and potentially to monitor storage-induced compositional changes. Fluorescence
EEM combined with multiway ROBPCA also provides a rapid and inexpensive method for
discrimination of yeastolate, yielding very similar results in terms of sample discrimination to
that obtained by SERS. However, the EEM data does not provide the same level of chemical
information as provided by the SERS. Thus the combination of the two methodologies has the
potential to be extremely useful in biopharmaceutical manufacturing for the rapid
characterization and screening of biogenic hydrolysates from animal or plant sources.