Investigation and modeling of lactic acid fermentation on wheat starch via SSF, CHF and SHF technology

Hetényi, Kata; Németh, Áron; Sevella, B.

doi:10.3311/pp.ch.2011-1.02

Cited by 13 publications

(8 citation statements)

References 20 publications

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“…For example, SSF of starch such as cassava, rice bran and wheat by Lactobacillus sp. resulted in the yields of 0.66, 0.28 and 0.89 and the productivities of 0.41, 0.78 and 1.74 g/L/h, respectively (Chookietwattana 2014;Tanaka et al 2006;Hetényi et al 2011). In other researches of lactic acid from alfalfa fiber and cassava bagasse by the same species, the yields were 0.35 and 0.96 and the productivities were 0.75 and 1.40 g/L/h, respectively (Sreenath et al 2001;John et al 2006).…”

Section: Lactic Acid Production From Ps Treated By Ssf With Thermotolmentioning

confidence: 89%

“…On the bioconversion from lignocellulosic biomass, which is applied not only to lactic acid but also to the other fermentation products, SSF is a more valid process than separate hydrolysis and fermentation (SHF) because the process can be carried out in one tank batch, though higher yields of fermentation products are achieved by SHF than SSF since it is possible to start high initial fermentable-sugars by the concentration of the hydrolysate (Hetényi et al 2011). The reason why SSF progressed the production of lactic acid effectively is that it can avoid product inhibition against hydrolases by fermentable sugars, as the lactic acid fermentation microorganisms consume sugars formed by hydrolases at once.…”

Section: Lactic Acid Production From Ps Treated By Ssf With Thermotolmentioning

confidence: 99%

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Lactic acid production from paper sludge by SSF with thermotolerant Rhizopus sp.

Maki

Hoshino

2016

Bioresour. Bioprocess.

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Background: Rhizopus fungi is suitable for the production of lactic acid, which is the backbone material of polylactic acid used as green plastic from lignocellulosic biomass, since it can grow and ferment in simple medium with various carbon sources such as starch and cellulose. Although paper sludge (PS) contains a lot of cellulosic fibers and in general was incinerated for volume reduction and heat recovery, other efficient utilizations have hardly been developed. In effective production of lactic acid from PS, the research of the extraction of cellulosic fiber from raw PS to obtain effectively fermentable sugars by cellulase and the selection of lactic acid microorganism are necessary. In this study, the PS pretreatment method with NaOH and HCl and the optimization of cellulase reagent were achieved, and also a desirable thermotolerant Rhizopus was selected. Finally, the production of lactic acid from the treated PS at 40 °C by simultaneous saccharification and fermentation (SSF) with the strain and an optimized cellulase cocktail was investigated.Results: Rhizopus oryzae NBRC 5384 was selected for thermotolerant lactic acid production from Rhizopus library because of its heat tolerance up to 40 °C and high lactic acid production of 80 g/L. The strain can ferment to lactic acid from hexose, pentose, sugar alcohol, disaccharide and starch. The soaking of raw PS in NaOH and HCl was able to reduce effectively inorganic materials and other reagents for repulping, and the content of Al and Ca per PS dry matter was mainly decreased from 32.9 and 30.8 to 14.1 and 1.66 %, respectively. SSF of the treated PS of 50 g/L with optimized cellulase cocktail and 5384 at 40 °C resulted in lactic acid production of 9.33 g/L for 96 h. Conclusion:The thermotolerant Rhizopus fungus was found based on its high performance in lactic acid production at high temperature from not only glucose, but also other various carbon sources including polysaccharides and the secretion of amylases and cellulases. The treatment of raw PS by NaOH and subsequent HCl was able to remove a large amount of inorganic materials with decrease of hydrophobicity. In SSF of the treated PS with the strain and the optimized cellulase cocktail, lactic acid was able to be produced. However, the increase of initial PS concentration in SSF led to the decrease of the yield with ethanol production, because of limited aeration due to increase of density. An appropriate oxygen supply to the strain is necessary to improve lactic acid production.

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Section: Lactic Acid Production From Ps Treated By Ssf With Thermotolmentioning

confidence: 89%

Section: Lactic Acid Production From Ps Treated By Ssf With Thermotolmentioning

confidence: 99%

Lactic acid production from paper sludge by SSF with thermotolerant Rhizopus sp.

Maki

Hoshino

2016

Bioresour. Bioprocess.

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“…The neutralizing agent reacts with the undissociated lactic acid formed during fermentation, to form lactate, which is less harmful to the microorganisms. Different batch fermentation methods have been evolved including separate hydrolysis and fermentation (SHF) and simultaneous saccharification and fermentation (SSF) . Owing to the separation of the hydrolysis step and the fermentation step the SHF process requires a higher enzyme load in order to effectively finish the two‐step process.…”

Section: State Of Art Production and Alternative Technologiesmentioning

confidence: 99%

Potential and assessment of lactic acid production and isolation - a review

Jantasee

Kienberger

Mungma

et al. 2017

J. Chem. Technol. Biotechnol

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The majority of commodity plastics is made from petroleum-based chemicals. Lactic acid serves as a monomer for the production of the biodegradable polymer polylactic acid (PLA). This paper provides a review on the state of the art production and isolation process for lactic acid. Problems in production and isolation have been identified, the relevant results in optimized production are presented in the first part of the paper. In the second part, a decision matrix is used as a guideline for the discussion on the state of research in the isolation and purification of lactic acid. Mechanical unit operations, mass transfer unit operations, reactive separation techniques, and process combinations are reported in the literature. At the end, an economic evaluation of isolation processes such as conventional precipitation, reactive membrane separation, and reactive distillation are presented.

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“…For the fermentations, Biostat Q (B. Braun, Melsungen, Germany) bench-top fermenters were used with magnetic stirrers (300 rpm), as well as pH and oxygen (Mettler, Switzerland) electrodes [22]. The glass reactors had jacketed walls.…”

Section: Methodsmentioning

confidence: 99%

Application of a High Cell Density Capacitance Sensor to Different Microorganisms

Kiss

Németh

2016

Period. Polytech. Chem. Eng.

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Investigation and modeling of lactic acid fermentation on wheat starch via SSF, CHF and SHF technology

Cited by 13 publications

References 20 publications

Lactic acid production from paper sludge by SSF with thermotolerant Rhizopus sp.

Lactic acid production from paper sludge by SSF with thermotolerant Rhizopus sp.

Potential and assessment of lactic acid production and isolation - a review

Application of a High Cell Density Capacitance Sensor to Different Microorganisms

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