Abstract
Soy hydrolysates are widely used as the major nutrient sources for cell culture processes for industrial manufacturing of therapeutic recombinant proteins. The primary goal of this study was to develop a spectroscopy based chemometric method, a partial least squares (PLS), to screen soy hydrolysates for better yield of protein production (titers) in cell culture medium. Harvest titer values of 29 soy hydrolysate lots with production yield between 490 and 1,350 mg/L were obtained from shake flask models or from manufacture engineering runs. The soy hydrolysate samples were measured by near-infrared (NIR) in reflectance mode using an infrared fiber optic probe. The fiber optic probe could easily enable in situ measurement of the soy hydrolysates for convenient raw material screening. The best PLS calibration has a determination coefficient of R 2 = 0.887 utilizing no spectral preprocessing, the two spectral ranges of 10,000–5,376 cm−1 and 4,980–4,484 cm−1, and a rank of 6 factors. The cross-validation of the model resulted in a determination coefficient of R 2 = 0.741 between the predicted and actual titer values with an average standard deviation of 72 mg/L. Compared with the resource demanding shake flask model, the combination of NIR and chemometric modeling provides a convenient method for soy hydrolysate screening with the advantage of fast speed, low cost and non-destructive.





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Li, G., Wen, Zq. Screening soy hydrolysates for the production of a recombinant therapeutic protein in commercial cell line by combined approach of near-infrared spectroscopy and chemometrics. Appl Microbiol Biotechnol 97, 2653–2660 (2013). https://doi.org/10.1007/s00253-013-4694-3
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DOI: https://doi.org/10.1007/s00253-013-4694-3


