Abstract
With the problems related to chemical methods of pyruvic acid (PA) synthesis, a fast-growing interest has been observed in research aiming at reducing the production cost of PA by applying biotechnological methods. This study aimed to investigate the potential applicability of Yarrowia lipolytica Wratislavia 1.31 yeast strain for valorisation of pure and crude glycerol through the production of industrially desired PA. Conditions required for the effective PA biosynthesis, i.e., pH value, thiamine concentration, agitation, and substrate concentration, were examined in batch and fed-batch cultivation modes. The efficient production of PA occurred under the limitation of thiamine (1 µg L−1) and was stimulated by moderate pH (4.5) and agitation (800 rev min−1) of the culture. Under optimal conditions, Y. lipolytica Wratislavia 1.31 was able to produce 85.2 g L−1 of PA with volumetric productivity of 0.90 g L−1 h−1. The yield of PA biosynthesis reached a high level of 1.03 g g−1. Obtained results confirmed the aptitude of Y. lipolytica yeast to produce high amounts of PA from simple glycerol-containing media. Presented process was very promising and might be considered as an attractive alternative for currently used chemical methods of PA synthesis.
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Introduction
Pyruvic acid (PA), a final compound of glycolysis, is an intermediate of a key role in metabolism as it is involved in pathways leading to formation of proteins, carbohydrates, and lipids. Its distinctive structure, comprising reactive carboxyl and ketone groups, offers the opportunity of application as a starting material for chemical synthesis of valuable products including pharmaceuticals such as l-tryptophan, l-tyrosine, 3-4-dihydroxyphenylalanine (DOPA), N-acetyl-D-neuraminic acid (sialic acid), or R-phenylacetylcarbinol (PAC). Moreover, growing interest in PA has been observed for use in food, cosmetics, and agrochemical industry (Maleki and Eiteman 2017; Li et al. 2001; Xu et al. 2008). However, the current expensive chemical methods of PA synthesis determine the high price of pyruvate which is a major reason limiting its use on a large scale. Chemical PA synthesis raises objections also due to the fact that it causes environmental pollution.
With the well-known problems related to chemical methods of PA synthesis, a great potential has appeared for the biotechnological methods. Hence, a fast-growing interest in research aiming at reducing the production cost of PA by applying methods of direct fermentation (Izumi et al. 1982; Kamzolova and Morgunow 2016; Wang et al. 2016; Yang et al. 2014; Yokota et al. 1994), resting cell fermentation (Ogawa et al. 2001; Moriguchi et al. 1984), and enzymatic or whole-cell bioconversion (Eisenberg et al. 1997; Ma et al. 2004; Hao et al. 2007). Direct fermentation seems to be the most advantageous method as it permits to obtain a product of high purity and is cost-effective thanks to the possibility of sustainable substrate application (Zelić et al. 2004). The possible impediment of this method is its relatively low productivity due to the difficulty of acquiring a strain capable of extracellular production of PA in satisfactory amounts (Song et al. 2016; Li et al. 2001). Even though PA is formed in central metabolic pathways of microorganisms, small amounts have been reported to be found (Maleki and Eiteman 2017). Nevertheless, effective production of PA requires minimized transformation of this metabolite in further steps of metabolism. It was demonstrated that it can be achieved by optimizing medium composition in processes employing auxotrophs Torulopsis glabrata and Escherichia coli, two microorganisms primarily used for the production of pyruvate (Li et al. 2002; Liu et al. 2006). In the fermentation processes of producing PA, glucose is mainly used as the substrate, and in years of research, much effort has been put to accelerate glycolysis to enhance glucose metabolism towards PA (Li et al. 2001, 2002; Song et al. 2016). Morgunov et al. (2004) reported that a yeast strain of Y. lipolytica was able to produce PA in glycerol-containing medium. However, up-to-date scientific data lack other information about potential application of these yeast in the production of PA.
The aim of the presented study was to investigate the possibility of PA production from pure and crude glycerol by Y. lipolytica Wratislavia 1.31 as well as to determine conditions required for the effective process of PA biosynthesis utilizing the examined yeast strain.
Experimental
Wratislavia 1.31 strain of Yarrowia lipolytica yeast (Rywińska et al. 2012) belonging to the Collection of the Department of Biotechnology and Food Microbiology (University of Environmental and Life Sciences, Wrocław, Poland) was used in the experiments presented in this report.
In the presented study, pure glycerol (purity of 98% wt wt−1; POCH, Gliwice, Poland) or crude glycerol (83% wt wt−1 of glycerol and 7.3% wt wt−1 of NaCl; Wratislavia-BIO, Wrocław, Poland) was applied as carbon and energy sources.
Medium used for preparation of inoculation culture contained the following constituents (g L−1) dissolved in distilled water: pure glycerol, 50.0; YNB (Yeast Nitrogen Base medium, Sigma-Aldrich), 0.067.
To examine the impact of pH value on PA production, the studied yeast was grown in a bioreactor medium containing (g L−1): pure glycerol, 100.0; (NH4)2SO4, 10.0; MgSO4·7H2O, 1.4; KH2PO4, 2.0; Ca(NO3)2, 0.8; NaCl, 0.5 dissolved in tap water and in pH set in the range of 3.0–5.5 (Table 1). The same medium was also applied in the experiments focused on determining thiamine concentration and stirrer speed. However, in those cases, the medium was additionally supplemented with thiamine in the concentration of 0–3.5 µg L−1 (Table 2) and with 1 µg L−1 (Table 3), respectively. When substrate concentration was tested in batch culture, bioreactor medium supplemented with 1 µg L−1 of thiamine and 150 g L−1 of glycerol was used.
In fed-batch mode, pure or crude glycerol (150 g L−1) was applied as the substrate. The initial medium was prepared with the use of (g L−1): glycerol, 60; (NH4)2SO4, 10.0; MgSO4·7H2O, 1.4; KH2PO4, 2.0; Ca(NO3)2, 0.8; NaCl, 0.5; thiamine, 1 µg, dissolved in tap water. During the cultivation process, the remaining quantity of the substrate was added to the culture broth in two portions of about 45 g L−1 each (Fig. 2).
Inoculation culture was performed in 300 mL flasks containing 100 mL of appropriate medium and put on a shaker (Certomat IS, Sartorius Stedim Biotech GmbH, Germany) at 140 rev min−1 and a temperature of 30 °C for 72 h. Next, 200 mL of the culture was used for bioreactor medium inoculation.
Bioreactor cultures were carried out in Biostat B+ bioreactor (Sartorius, Germany) in the working volume of 2 L. If not otherwise indicated, the parameters were set at 30 °C, 0.6 vvm, 800 rev min−1, and pH of 4.5 was maintained automatically by the addition of 40% NaOH solution. Part of the experiments were meant to examine the impact of stirrer speed of 600–1000 rev min−1 (Table 3) and pH value of 3.0–5.5 (Table 1).
All the bioreactor cultures were performed in three replicates and standard deviations were calculated. In the samples, the analysis of the biomass, concentrations of glycerol, pyruvic acid (PA), and α-ketoglutaric acid (KGA) were determined as described by Cybulski et al. 2018.
Results and discussion
Determination of optimal pH for PA biosynthesis by Y. lipolytica
Studies up-to-date report that high extracellular concentration of PA (exceeding 45 g L−1) might significantly inhibit further formation of this acid and lead to a decline in parameters of the biosynthesis process. Moreover, in case of PA, the inhibitory effect of the end-product might be enhanced at low pH at which time a toxic effect of undissociated form of the acid occurs (Liu et al. 2006). Therefore, maintaining an optimal level of pH during the process of microbial PA production seems to be of great importance. To determine the appropriate pH value for effective production of PA, Y. lipolytica Wratislavia 1.31 was cultivated in bioreactor cultures in the media with pH value ranging from 3.0 to 5.5. The increase of the cell growth from 7.4 to 12.1 g L−1 was observed when pH value increased from 3.5 to 5.0 (Table 1). Biosynthesis of PA was dependent on the pH and ranged from 38.0 to 55.0 g L−1. The highest PA concentration and parameters of PA production were obtained in the culture with pH of 4.5. Under such conditions, the yield of PA formation reached 0.54 g g−1, whereas volumetric and specific productivity amounted to 0.75 g L−1 h−1 and 0.07 g g−1 h−1, respectively. Moreover, in the culture with pH 4.5, a comparatively low formation of KGA (11.9 g L−1) was observed, whereas, under other pH conditions, the yeast was able to produce up to 15.4 g L−1 of this acid. On the basis of data from this experiment, pH 4.5 was indicated as the most suitable for PA production by examined strain of Y. lipolytica. According to Kamzolova and Morgunow (2016) during the biosynthesis of PA by Blastobotrys adeninivorans, pH of the culture broth was maintained at 4.5 which allowed to obtain 43.2 g L−1 of PA from 100 g L−1 of glucose. It is a significantly lower amount than was produced under the same pH conditions by Y. lipolytica from 100 g L−1 of glycerol in this study. In other literature reports concerning biosynthesis of PA by different microorganisms (Liu et al. 2004; Morgunov et al. 2004; Wang et al. 2012; Yang et al. 2014; Zhang and Gao 2007), the pH of the culture media was maintained at a similar level (4.5–5.5) as indicated in this work.
The impact of thiamine on PA formation
The natural feature of Y. lipolytica yeast is the lack of ability to synthesize the pyrimidine structure of the thiamine molecule. Therefore, for normal growth, the yeast requires their growth media to be supplemented with this vitamin at a concentration of about 200 µg L−1 (Chernyavskaya et al. 2000). In cell metabolism, thiamine acts as a cofactor of pyruvate dehydrogenase complex (PDH). A deficiency of this vitamin might cause a decrease of PDH activity and thus lead to the reduction of further transformation of PA (Li et al. 2001). Therefore, intentional limitation of thiamine in the culture of the thiamine-auxotrophic yeast Y. lipolytica creates a possibility for enhancing PA accumulation and excretion to the culture broth. In the presented study, the influence of thiamine on PA synthesis by Y. lipolytica was examined in the media with vitamin concentration that varied from 0 to 3.5 µg L−1. As a result of increasing thiamine concentration, an increase in biomass level was observed in the studied cultures (Table 2). The highest biomass concentration observed when 3.5 µg L−1 of thiamine was applied reached 14.4 g L−1 and was considerably higher than in the culture without the vitamin addition where it amounted to 11.6 g L−1. In the culture without thiamine supplementation, the yeast was able to produce 55.0 g L−1 of PA and 11.9 g L−1 of KGA. Despite the fact that, in this culture, bioreactor medium did not contain thiamine, it should be noted that some amount of the vitamin was introduced to the bioreactor with inoculation culture (as a component of commercial YNB medium) and was the reason for comparably good growth of the yeast in the bioreactor culture. Addition of 1 µg L−1 of thiamine to the culture medium allowed to obtain a slightly improved PA biosynthesis (57.8 g L−1) and a lowered production of KGA (7.2 g L−1). In such conditions, the highest values of PA volumetric productivity and production yield were observed and reached 0.83 g L−1 h−1 and 0.56 g g−1, respectively. Moreover, when 1 µg L−1 of thiamine was applied in the culture, the highest ratio of PA in the sum of acids (PA:(PA + KGA)) was noted (0.89). Further increase of the vitamin supplementation resulted in the significant drop of PA formation as well as a decrease in its production parameters. Summarizing, the obtained results indicate that thiamine limitation, at the initial level of 1 µg L−1, is appropriate for PA biosynthesis with the use of the examined strain of Y. lipolytica. Thus, this concentration was chosen for further experiments. In comparison, the most efficient PA production by Y. lipolytica 374/4 was observed when 2 and 3 µg L−1 of thiamine were added to the glucose- and glycerol-containing media, respectively (Morgunov et al. 2004). Hence, it should be noted that optimal concentration of thiamine, necessary for effective production of PA by Y. lipolytica, may depend on the applied strain, substrate, and composition of the inoculation media. In other studies on the biotechnological production of PA, the enhanced product formation was stimulated by application of limiting doses of the factors indispensable for growth of different auxotrophic microorganisms: thiamine in case of auxotrophs of Acinetobacter genus (Izumi et al. 1982), Schizophyllum commune (Takao and Tanida 1982), and Debaryomyces coudertii (Moriguchi 1982), lipoic acid in case of Escherichia coli (Yokota et al. 1994), arginine (Miyata et al. 1989a), and isoleucine/valine (Miyata et al. 1989b) in case of mutant strains of Torulopsis glabrata, and a carefully balanced media with appropriate concentration of biotin, nicotinic acid, pyridoxine, and thiamine in case of a multi-vitamin auxotroph of T. glabrata (Yonehara and Miyata 1994).
The effect of agitation on the production of PA
The ability of PA production by Y. lipolytica Wratislavia 1.31 was investigated under different stirring conditions: 600, 800, and 1000 rev min−1. The best results were achieved at 800 rev min−1 with biomass level reaching 12.9 and 57.8 g L−1 of PA being produced at 0.56 g g−1 yield and production rate of 0.83 g L−1 h−1 (Table 3). An additional variant where culture was started at the stirrer speed of 1000 rev min−1 and switched to 800 rev min−1 after 24 h of cultivation was also performed. Concentration of PA obtained in that culture (55.1 g L−1) was slightly lower than in the case of the culture conducted at 800 rev min−1. However, in the culture stirred at 1000/800 rev min−1, the biosynthesis time and production of KGA were slightly reduced and resulted in very similar yield, production rate, and ratio of PA in the sum of acids as compared to the culture stirred at 800 rev min−1. In contrast, for Torulopsis glabrata grown on glucose media, the best results of PA biosynthesis were observed when two-stage oxygen supply strategy was applied in which, during the first phase, the agitation of 700 rev min−1 was used to stimulate cell growth. Subsequently, after 16 h, the stirrer speed was switched to 500 rev min−1 to stimulate pyruvate production (Li et al. 2002). As a result, the process ended 69.4 g L−1 of PA was obtained from 112.0 g L−1 of glucose. In the experiment presented in this study at stirring speed of 800 rev min−1, the increased cell growth of Y. lipolytica corresponded to the increased production of PA.
Substrate concentration affects PA production
The pH of 4.5, thiamine concentration of 1 µg L−1, and agitation rate of 800 rev min−1 were found to be the most favourable conditions for PA production when the medium with 100 g L−1 of glycerol was applied. In the next experiment, the effect of glycerol concentration on PA biosynthesis was examined by application of the medium with 150 g L−1. The comparison of the cultures results obtained in the same conditions with different glycerol concentration showed that in the process, with an increased substrate concentration (150 g L−1), growth of the examined strain reached 11.7 g L−1 (Fig. 1) and was slightly lower than in cultures with 100 g L−1 of glycerol added to the medium (Table 3) where it was 12.9 g L−1. In conditions of higher availability of the substrate, the yeast was able to produce more PA (65 g L−1) with simultaneous significant increase of KGA production (20.2 g L−1). Hence, unfavourable change of the ratio of PA in the sum of acids (0.76) was observed under increased glycerol concentration. Moreover, in comparison with the culture with lower glycerol concentration, application of 150 g L−1 of the substrate in the culture medium resulted in an extended duration of the process. Therefore, an observed drop of PA productivity and specific production rate to the following levels: 0.59 g L−1 h−1 and 0.051 g g−1 h−1, respectively. In such conditions, the unfavourable decrease of PA yield (0.44 g g−1) was also noted.
Production of PA under fed-batch cultivations
To avoid the inhibitory effect of high substrate concentration on PA biosynthesis in the next step of the study, a fed-batch mode of cultivation was applied. The biosynthesis was initiated in the medium with comparatively low concentration of pure or crude glycerol (60 g L−1) and supplemented with two pulsed additions of the substrate during cultivation (Fig. 2a, b). As presented in Fig. 2a, the growth of yeast reached 11.5 g L−1 and was at the same level as in the batch culture with the same concentration of the substrate (150 g L−1) in the culture medium. However, in contrast to the batch culture, fed-batch mode application allowed to obtain 85.2 g L−1 of PA within only 93 h which resulted in the highest value of volumetric production rate—0.92 g L−1 h−1. Moreover, under conditions of fed-batch culture, the yeast was able to synthesize significantly higher amount of PA without increasing production of KGA which resulted in the satisfactory ratio of PA in the sum of acids (0.88) and the upswing of PA production yield (0.61 g g−1) (Table 4). The satisfactory results of application of high glycerol concentration in fed-batch mode lead to the idea of crude glycerol adaptation for the process (Fig. 2b). It was observed that application of crude substrate resulted in a yeast growth increased to a level of 14.8 g L−1, which might be explained by the impurities of natural origin, e.g., vitamins, usually found in this kind of substrate. A total time of fed-batch processes with both kinds of glycerol was almost the same; however, the amount of PA (62.5 g L−1) and KGA (22.1 g L−1) biosynthesized from the crude glycerol media were very similar to the results achieved in the batch process with pure glycerol, which is comparatively lower than in the fed-batch process with pure glycerol. The productivity and yield of PA formation from crude glycerol reached 0.68 g L−1 h−1 and 0.41 g g−1, respectively. Moreover, after crude substrate application, the changes in the produced ratio of PA:KGA was observed. It should be noted that the modification of the ratio of PA:KGA production might change in the presence of different factors, biotin included, contained as the impurities in crude glycerol (Cybulski et al. 2018).
It was reported that, in fed-batch culture of Y. lipolytica 374/4 with pure glycerol media after 78 h of cultivation, 61.3 g L−1 of PA was detected, which corresponded to a specific production rate of 0.076 g g−1 h−1 (Morgunov et al. 2004). Therefore, our results showed that Y. lipolytica Wratislavia 1.31 was able to produce PA with higher volumetric and specific production rates in comparison to the findings of Morgunov et al. (2004). In addition, in the report by these researchers, it was presented that the process of PA production from glycerol by Y. lipolytica 374/4 was characterized by the energy yield coefficient (ηPA) of 0.53 and was higher when compared to the results of 0.44 published for glucose-grown yeast T. glabrata (Li et al. 2002; Morgunov et al. 2004). In our study, the maximum energy yield coefficient value was obtained in fed-batch culture with pure glycerol and reached 0.46 (Table 4), and hence, it was higher than the result cited above for glucose. In the study on the production of PA from glucose by B. adeninivorans in fed-batch mode, cultivation yeast produced 43.2 g L−1 of PA (Kamzolova and Morgunov 2016). The yield of the PA biosynthesis calculated in the stationary phase of the culture, when the cell growth was ceased, was 0.77 g g−1. It is worth noting that in the presented study of PA production from glycerol by Y. lipolytica Wratislavia 1.31, the yield calculated for the stationary growth phase was significantly higher, because it reached 1.03 g g−1. Currently, T. glabrata is a strain of microorganisms used for commercial production of PA as its application allows to obtain high amounts of the acid (Xu et al. 2008). In the literature, the highest parameters of PA biosynthesis by these yeast were reported for mutant strain T. glabrata RS23 which produced 94.3 g g−1 of PA from 150.0 g L−1 of glucose, corresponding to the yield of 0.64 g g−1 (Liu et al. 2006). However, in biosynthesis of PA by T. glabrata, achieving high productivity is not possible without providing optimal nutrient environment, i.e., optimal and balanced concentration of nitrogen, thiamine, biotin, riboflavin, nicotinic acid, and pyridoxine (Yang et al. 2014). In view of these findings, the outcome of our experiments on PA production from glycerol by Y. lipolytica, auxotrophic only to thiamine, resulting in only a little lower PA concentration and the yield comparative to values reported for T. glabrata, seems to be very promising.
Conclusions
The cost of biotechnological production of 1 ton of PA from glucose is calculated at the level of $1255, whereas chemical synthesis generates a cost as high as $8650 (Li et al. 2001). In this work, we offer the environmentally friendly biotechnological method of PA production that uses glycerol—considerably less expensive substrate than glucose, especially when crude glycerol is considered. In addition, of great importance seems to be the fact that application of glycerol does not meet with any sociological controversy, as it is in case of glucose (Dobson et al. 2012). Moreover, it should be noted that satisfactory production parameters of PA by other microorganisms were generally achieved only after application of genetically modified strains (Liu and Cao 2018; Luo et al. 2018; Zhang et al. 2017; Maleki and Eiteman 2017). In this work, we have presented a potential of not genetically modified Y. lipolytica yeast strain to produce PA from a renewable carbon source.
In the presented study, it was shown that PA biosynthesis by Y. lipolytica Wratislavia 1.31 was characterized by a comparable or higher value of PA production parameters than reported by other researchers for other microorganisms. Under optimal conditions, the examined yeast strain was able to produce 85 g L−1 of PA with the energy yield coefficient of 0.46. The satisfactory results of the herein described experiments indicate that production of PA on simple glycerol-containing medium by Y. lipolytica was very promising and might be considered as an attractive alternative for currently used chemical methods of PA synthesis.
Abbreviations
- X :
-
Biomass (g L−1)
- PA:
-
Pyruvic acid (g L−1)
- KGA:
-
α-ketoglutaric acid (g L−1)
- Y :
-
Pyruvic acid production yield (g g−1)
- Q :
-
Volumetric productivity of pyruvate (g L−1h−1)
- q :
-
Specific production rate of pyruvic acid (g g−1h−1)
- η PA :
-
Yield coefficient of PA production
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Publication supported by Wrocław Centre of Biotechnology, programme The Leading National Research Centre (KNOW) for years 2014–2018.
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Cybulski, K., Tomaszewska-Hetman, L., Rymowicz, W. et al. Yarrowia lipolytica application as a prospective approach for biosynthesis of pyruvic acid from glycerol. Chem. Pap. 72, 3077–3083 (2018). https://doi.org/10.1007/s11696-018-0513-8
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DOI: https://doi.org/10.1007/s11696-018-0513-8