Production of L-Lactic Acid Using Various Carbon Sources by Enterococcus Gallinarum EB1
This study reports on the production of L-lactic acid using a locally isolated bacteria. Bacteria were screened and isolated from POME sludge, kitchen refuse, leachate biomass, soil and fermented milk. Five bacteria shown positive result in the preliminary test and only one bacteria which was is...
| Main Author: | |
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| Format: | Thesis |
| Language: | English English |
| Published: |
2002
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/8475/ http://psasir.upm.edu.my/id/eprint/8475/1/FSMB_2002_12_IR.pdf |
| _version_ | 1848840879973859328 |
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| author | Cheong, Weng Chung |
| author_facet | Cheong, Weng Chung |
| author_sort | Cheong, Weng Chung |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | This study reports on the production of L-lactic acid using a locally isolated
bacteria. Bacteria were screened and isolated from POME sludge, kitchen
refuse, leachate biomass, soil and fermented milk. Five bacteria shown
positive result in the preliminary test and only one bacteria which was
isolated from POME effluent shown the highest lactic acid production. Using
shake flask culture, 18.0 g/L of L-lactic acid was produced from 20.0 g/L
glucose . The selectivity of lactic acid produced by the bacteria was 99.8%
compared to other organic acids. This indicated that the bacteria can be use
for the production of L-Lactic acid. Using the BIOLOG system, the bacteria
was identified belonging to the family Enterococcus gallinarum and named as
Enterococcus gallinarum EB1. Morphologically, the bacteria is cocci-shaped
and in chains or grouped. The optimal growth condition for the bacteria was
at pH 6 and temperature 37°C where at this condition, the bacteria able to
produced highest lactic acid yield at 1.9 g/g using glucose as substrate. The
organic acids composition was dependent on the pH and temperature. In an
anaerobic batch fermentation to produce lactic acid using four types of substrates (glucose, kitchen refuse, sago starch and cooked rice), the highest
lactic acid production was 45.0 g/L. From the experiment, the bacteria was
able to convert the kitchen refuse into lactic acid at 45.2 g/L and small
amount of other organic acids. The comparison was also done with other
substrates to show that the bacteria able to utilise kitchen refuse in lactic acid
production. In the recovery process of lactic acid, the best method was to use
H₂SO₄ prior to evaporation at 90°C with 3mmHg vacuum pressure. H₂SO₄
able to free lactic acid from lactate salts formed in the fermentation because
the use of NaOH to control pH in the bioreactor throughout the fermentation
process. The evaporation method able to achieved 86.76% lactic acid recovery
yield from the fermentation broth. It was the highest recovery yield recorded
in evaporation compared to other evaporation method with additional of
solvents (propanol and butanol) with temperature at 90°C and pressure
around 3mmHg. |
| first_indexed | 2025-11-15T07:34:22Z |
| format | Thesis |
| id | upm-8475 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English English |
| last_indexed | 2025-11-15T07:34:22Z |
| publishDate | 2002 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-84752024-01-26T07:08:33Z http://psasir.upm.edu.my/id/eprint/8475/ Production of L-Lactic Acid Using Various Carbon Sources by Enterococcus Gallinarum EB1 Cheong, Weng Chung This study reports on the production of L-lactic acid using a locally isolated bacteria. Bacteria were screened and isolated from POME sludge, kitchen refuse, leachate biomass, soil and fermented milk. Five bacteria shown positive result in the preliminary test and only one bacteria which was isolated from POME effluent shown the highest lactic acid production. Using shake flask culture, 18.0 g/L of L-lactic acid was produced from 20.0 g/L glucose . The selectivity of lactic acid produced by the bacteria was 99.8% compared to other organic acids. This indicated that the bacteria can be use for the production of L-Lactic acid. Using the BIOLOG system, the bacteria was identified belonging to the family Enterococcus gallinarum and named as Enterococcus gallinarum EB1. Morphologically, the bacteria is cocci-shaped and in chains or grouped. The optimal growth condition for the bacteria was at pH 6 and temperature 37°C where at this condition, the bacteria able to produced highest lactic acid yield at 1.9 g/g using glucose as substrate. The organic acids composition was dependent on the pH and temperature. In an anaerobic batch fermentation to produce lactic acid using four types of substrates (glucose, kitchen refuse, sago starch and cooked rice), the highest lactic acid production was 45.0 g/L. From the experiment, the bacteria was able to convert the kitchen refuse into lactic acid at 45.2 g/L and small amount of other organic acids. The comparison was also done with other substrates to show that the bacteria able to utilise kitchen refuse in lactic acid production. In the recovery process of lactic acid, the best method was to use H₂SO₄ prior to evaporation at 90°C with 3mmHg vacuum pressure. H₂SO₄ able to free lactic acid from lactate salts formed in the fermentation because the use of NaOH to control pH in the bioreactor throughout the fermentation process. The evaporation method able to achieved 86.76% lactic acid recovery yield from the fermentation broth. It was the highest recovery yield recorded in evaporation compared to other evaporation method with additional of solvents (propanol and butanol) with temperature at 90°C and pressure around 3mmHg. 2002-10 Thesis NonPeerReviewed text en http://psasir.upm.edu.my/id/eprint/8475/1/FSMB_2002_12_IR.pdf Cheong, Weng Chung (2002) Production of L-Lactic Acid Using Various Carbon Sources by Enterococcus Gallinarum EB1. Masters thesis, Universiti Putra Malaysia. Lactic acid Bacteria English |
| spellingShingle | Lactic acid Bacteria Cheong, Weng Chung Production of L-Lactic Acid Using Various Carbon Sources by Enterococcus Gallinarum EB1 |
| title | Production of L-Lactic Acid Using Various Carbon Sources by Enterococcus Gallinarum EB1 |
| title_full | Production of L-Lactic Acid Using Various Carbon Sources by Enterococcus Gallinarum EB1 |
| title_fullStr | Production of L-Lactic Acid Using Various Carbon Sources by Enterococcus Gallinarum EB1 |
| title_full_unstemmed | Production of L-Lactic Acid Using Various Carbon Sources by Enterococcus Gallinarum EB1 |
| title_short | Production of L-Lactic Acid Using Various Carbon Sources by Enterococcus Gallinarum EB1 |
| title_sort | production of l-lactic acid using various carbon sources by enterococcus gallinarum eb1 |
| topic | Lactic acid Bacteria |
| url | http://psasir.upm.edu.my/id/eprint/8475/ http://psasir.upm.edu.my/id/eprint/8475/1/FSMB_2002_12_IR.pdf |