Lactic Acid Production from Distiller’s Dried Grains Dilute Acid Hydrolysates
Lactic acid (LA) is an important chemical with diverse applications in various industries. LA can be produced by the fermentation of different substrates by many microorganisms such as bacteria, fungi, yeasts, and algae. Lactic acid bacteria (LAB) are generally accepted as the main producers of LA....
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MDPI AG
2024-11-01
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| Series: | Fermentation |
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| author | Greta Naydenova Petya Popova-Krumova Svetla Danova Dragomir Yankov |
| author_facet | Greta Naydenova Petya Popova-Krumova Svetla Danova Dragomir Yankov |
| author_sort | Greta Naydenova |
| collection | DOAJ |
| description | Lactic acid (LA) is an important chemical with diverse applications in various industries. LA can be produced by the fermentation of different substrates by many microorganisms such as bacteria, fungi, yeasts, and algae. Lactic acid bacteria (LAB) are generally accepted as the main producers of LA. A distinct characteristic of LAB is the complexity of the fermentation media. Distiller’s dried grains with solubles (DDGS), a by-product from bioethanol production, represent a promising substitute for costly sugars in the nutrition media for LA production. In the present paper, the possibility of using dilute acid DDGS hydrolysates as a substrate for LA fermentation was investigated. The influence of different factors (acid concentration, time, pressure, solid-to-liquid ratio) on the reducing sugars (RS) obtained was studied. Additional enzyme hydrolysis was carried out to increase RS content in the hydrolysates. LA production from hydrolysates without and with control of the pH during fermentation was monitored and compared with lactose as a substrate. Inhibition of the process was observed in both substrates in the absence of pH control which was overcome in the case of pH control. A mathematical model based on the Verhulst and Ludeking–Piret equations was proposed and tested, showing very good agreement with experimental data. |
| format | Article |
| id | doaj-art-9cad7ee4800b41b7b291c5549c7c82b4 |
| institution | Kabale University |
| issn | 2311-5637 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Fermentation |
| spelling | doaj-art-9cad7ee4800b41b7b291c5549c7c82b42024-11-26T18:03:35ZengMDPI AGFermentation2311-56372024-11-01101158110.3390/fermentation10110581Lactic Acid Production from Distiller’s Dried Grains Dilute Acid HydrolysatesGreta Naydenova0Petya Popova-Krumova1Svetla Danova2Dragomir Yankov3Institute of Chemical Engineering, Bulgarian Academy of Sciences, 103 Acad. G. Bontchev Str., 1113 Sofia, BulgariaInstitute of Chemical Engineering, Bulgarian Academy of Sciences, 103 Acad. G. Bontchev Str., 1113 Sofia, BulgariaThe Stephan Angeloff Institute of Microbiology, Bulgarian Academy of Sciences, 26 Acad. G. Bontchev Str., 1113 Sofia, BulgariaInstitute of Chemical Engineering, Bulgarian Academy of Sciences, 103 Acad. G. Bontchev Str., 1113 Sofia, BulgariaLactic acid (LA) is an important chemical with diverse applications in various industries. LA can be produced by the fermentation of different substrates by many microorganisms such as bacteria, fungi, yeasts, and algae. Lactic acid bacteria (LAB) are generally accepted as the main producers of LA. A distinct characteristic of LAB is the complexity of the fermentation media. Distiller’s dried grains with solubles (DDGS), a by-product from bioethanol production, represent a promising substitute for costly sugars in the nutrition media for LA production. In the present paper, the possibility of using dilute acid DDGS hydrolysates as a substrate for LA fermentation was investigated. The influence of different factors (acid concentration, time, pressure, solid-to-liquid ratio) on the reducing sugars (RS) obtained was studied. Additional enzyme hydrolysis was carried out to increase RS content in the hydrolysates. LA production from hydrolysates without and with control of the pH during fermentation was monitored and compared with lactose as a substrate. Inhibition of the process was observed in both substrates in the absence of pH control which was overcome in the case of pH control. A mathematical model based on the Verhulst and Ludeking–Piret equations was proposed and tested, showing very good agreement with experimental data.https://www.mdpi.com/2311-5637/10/11/581lactic acid production<i>Lactiplantibacillus plantarum</i>distiller’s dried grainsdilute acid hydrolysispH-controlled fermentationprocess modeling |
| spellingShingle | Greta Naydenova Petya Popova-Krumova Svetla Danova Dragomir Yankov Lactic Acid Production from Distiller’s Dried Grains Dilute Acid Hydrolysates Fermentation lactic acid production <i>Lactiplantibacillus plantarum</i> distiller’s dried grains dilute acid hydrolysis pH-controlled fermentation process modeling |
| title | Lactic Acid Production from Distiller’s Dried Grains Dilute Acid Hydrolysates |
| title_full | Lactic Acid Production from Distiller’s Dried Grains Dilute Acid Hydrolysates |
| title_fullStr | Lactic Acid Production from Distiller’s Dried Grains Dilute Acid Hydrolysates |
| title_full_unstemmed | Lactic Acid Production from Distiller’s Dried Grains Dilute Acid Hydrolysates |
| title_short | Lactic Acid Production from Distiller’s Dried Grains Dilute Acid Hydrolysates |
| title_sort | lactic acid production from distiller s dried grains dilute acid hydrolysates |
| topic | lactic acid production <i>Lactiplantibacillus plantarum</i> distiller’s dried grains dilute acid hydrolysis pH-controlled fermentation process modeling |
| url | https://www.mdpi.com/2311-5637/10/11/581 |
| work_keys_str_mv | AT gretanaydenova lacticacidproductionfromdistillersdriedgrainsdiluteacidhydrolysates AT petyapopovakrumova lacticacidproductionfromdistillersdriedgrainsdiluteacidhydrolysates AT svetladanova lacticacidproductionfromdistillersdriedgrainsdiluteacidhydrolysates AT dragomiryankov lacticacidproductionfromdistillersdriedgrainsdiluteacidhydrolysates |