Abstract
D-lactic acid is a key monomer of polylactic acid (PLA) and other biopolymers. In this work, the effects of temperature and pH on the D-lactate production with Lactobacillus delbrueckii in model sugar solutions and real orange peel waste hydrolysates (OPWH) have been studied and modeled with a non-structured non-segregated kinetic model. Lactobacillus delbrueckii ssp. delbrueckki CECT 286 yields 0.88 g/g of D-lactate (purity 97%) with a productivity of 2.56 g/L·h in the best tested conditions (40 °C and pH 5.8). The proposed kinetic model is able to describe the performed runs, and its kinetic parameters reflect the influence of temperature and pH on the uptake of monosaccharides, D-lactic acid production, and bacterium growth. Moreover, it can be applied to simulate runs with real OPWH supplemented with MRS broth or corn steep liquor (CSL) as a nitrogen source.
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Abbreviations
- Cj :
-
Referred to concentrations of compound j (gj/L).
- D-LA:
-
D-lactic acid.
- F:
-
Fischer-F, statistical parameter.
- Ks :
-
Saturation constant for the glucose (gG/L).
- kP :
-
Kinetic constant for D-lactic acid production from fructose and galactose (gP.L/gF + Gl.gX.h).
- M:
-
Number of parameters of a proposed model.
- N:
-
Total number of experimental data used for fitting.
- P:
-
Productivity of D-lactic acid (g/L·h).
- ri :
-
Reaction rate of the reaction i (g/L·h).
- RMSE:
-
Residual mean squared error.
- SSQl :
-
Sum of squared residues respect to the calculated value of “l” variable.
- SSQlmean :
-
Squared sum of deviations between the experimental and the mean score respect to The calculated values of the variable.
- SSR:
-
Sum of squared residuals.
- t:
-
Time (h).
- VE:
-
Variation explained of a nonlinear regression fitting (%).
- YP,S :
-
Yield of D-lactic acid referred to the total consumption of carbon sources (g/g).
- yi :
-
Experimental or calculated values of “i” variables.
- μm :
-
Maximum biomass growth rate (h−1).
- νij :
-
Coefficients in the reaction scheme (eqs. (3) and (4)) (gi·gj−1).
- A:
-
Referred to arabinose.
- calc:
-
Referred to the calculated value of a variable from the model.
- F:
-
Referred to fructose.
- G:
-
Referred to glucose.
- Gl:
-
Referred to galactose.
- P:
-
Referred to product (D-lactic acid).
- S:
-
Referred to the sum of all the substrates.
- tab:
-
Referred to a F-value given by F-test tables for a confidence interval.
- X:
-
Referred to biomass.
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This work has been supported by the Spanish MICINN under contract PCIN-2013-021-C02-01.
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de la Torre, I., Ladero, M. & Santos, V.E. Production of D-lactic acid by L. delbrueckii growing on orange peel waste hydrolysates and model monosaccharide solutions: effects of pH and temperature on process kinetics. Biomass Conv. Bioref. 9, 565–575 (2019). https://doi.org/10.1007/s13399-019-00396-3
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DOI: https://doi.org/10.1007/s13399-019-00396-3