scholarly journals Opportunities, perspectives and limits in lactic acid production from waste and industrial by-products

2016 ◽  
Vol 70 (4) ◽  
pp. 435-449 ◽  
Author(s):  
Dragana Mladenovic ◽  
Aleksandra Djukic-Vukovic ◽  
Jelena Pejin ◽  
Suncica Kocic-Tanackov ◽  
Ljiljana Mojovic
Keyword(s):  
Lactic Acid ◽  
Acid Production ◽  
New Technologies ◽  
Lactic Acid Production ◽  
Physical Nature ◽  
Raw Material ◽  
Poly Lactic Acid ◽  
Immobilized Cell ◽  
Waste Products ◽  
By Products

In line with the goals of sustainable development and environmental protection today great attention is directed towards new technologies for waste and industrial by-products utilization. Waste products represent potentially good raw material for production other valuable products, such as bioethanol, biogas, biodiesel, organic acids, enzymes, microbial biomass, etc. Since the first industrial production to the present, lactic acid has found wide application in food, cosmetic, pharmaceutical and chemical industries. In recent years, the demand for lactic acid has been increasing considerably owing to its potential use as a monomer for the production of poly-lactic acid (PLA) polymers which are biodegradable and biocompatible with wide applications. Waste and industrial by-products such are whey, molasses, stillage, waste starch and lignocellulosic materials are a good source of fermentable sugars and many other substances of great importance for the growth of microorganisms, such as proteins, minerals and vitamins. Utilization of waste products for production of lactic acid could help to reduce the total cost of lactic acid production and except the economic viability of the process offers a solution of their disposal. Fermentation process depends on chemical and physical nature of feedstocks and the lactic acid producer. This review describes the characteristics, abilities and limits of microorganisms involved in lactic acid production, as well as the characteristics and types of waste products for lactic acid production. The fermentation methods that have been recently reported to improve lactic acid production are summarized and compared. In order to improve processes and productivity, fed-batch fermentation, fermentation with immobilized cell systems and mixed cultures and opportunities of open (non-sterilized) fermentation have been investigated.

scholarly journals Lactic acid production ability of Lactobacillus sp. from four tropical fruits using their by-products as carbon source

Heliyon ◽  
2021 ◽  
Vol 7 (5) ◽  
pp. e07079
Author(s):  
Joel Romial Ngouénam ◽  
Chancel Hector Momo Kenfack ◽  
Edith Marius Foko Kouam ◽  
Pierre Marie Kaktcham ◽  
Rukesh Maharjan ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Carbon Source ◽  
Acid Production ◽  
Lactic Acid Production ◽  
Tropical Fruits ◽  
By Products

scholarly journals Lactic acid production from cane molasses

2017 ◽  
Vol 2 (1) ◽  
pp. 13-16 ◽  
Author(s):  
Aladár Vidra ◽  
András József Tóth ◽  
Áron Németh
Keyword(s):  
Heavy Metals ◽  
Lactic Acid ◽  
Acid Production ◽  
Animal Feed ◽  
Sugar Content ◽  
Lactic Acid Production ◽  
Raw Material ◽  
Lactobacillus Species ◽  
Alcohol Production ◽  
Study Results

Abstract Molasses, a by-product of the sugar manufacturing process, generally comprises approximately 50% (w/w) of total sugars, but it is currently used primarily [1] as an animal feed and as a raw material in alcohol production. Currently, the sugar production is more than 160 million tones worldwide. Its byproduct molasses contain heavy metals which have growthinhibitory effect. The main sugar content in molasses is sucrose which often need to be hydrolyzed to glucose and fructose especially for utilization by Lactobacillus species. Lactobacillus species can convert sugar content to lactic acid with great efficiency, which is a valuable chemical. Lactic acid production from sugar molasses using batch fermentations with Lactobacillus casei and Lactobacillus sp. MKT878 were investigated in this study. Results showed, that both examined Lactobacillus species could grow on molasses despite the heavy metals inhibitory effects. The conversion of sugar content to lactic acid was successful with yield between 55-80 g/g.

scholarly journals The Influence of by-Products From Brewery Spent Grain Hydrolysis on Lactic Acid Fermentation Efficiency

2021 ◽  
Author(s):  
Magdalena Lech
Keyword(s):  
Lactic Acid ◽  
Production Efficiency ◽  
Low Cost ◽  
Lactic Acid Production ◽  
Glucose Consumption ◽  
Raw Material ◽  
Acid Fermentation ◽  
Spent Grain ◽  
Fermentable Carbohydrates ◽  
By Products

Abstract The brewery spent grain (BSG) is a lignocellulosic waste material produced in a huge amount around the world. Strict environmental protection law requires proper utilization. BSG can be transformed into easy-fermentable carbohydrates as a result of hydrolysis. This may be a low-cost raw material for biotechnological fermentation. The literature provides a lot of information that hydrolysis of lignocellulose creates by-products which can be potentially noxious to bacteria cells employed in fermentation. This research examined the influence of most of these by-products: furfural, acetic, formic, gallic, and levuilnic acid, on the LA fermentation effectiveness. These components were introduced to Lactobacillus cultures in various concentrations. The rate of cell growth, glucose consumption, and lactic acid production were measured. This components affects in various extent on LA formation in the culture. In any case, there is a critical value of them harms the fermentation, due to the reduced ability of bacteria propagation. Lower concentrations of bio-catalyst lead to an LA production efficiency drop. The LA concentrations in flasks after one day of propagation with the 2.1 [g/L] of appropriate inhibitor drop app. [%] 16 (F), 22 (GA), 8 (LevA), 40 (AA), and 100 (FA) in comparison to the flask without any inhibitor.

scholarly journals Production of lactic acid by Enterococcus faecalis on waste glycerol from biodiesel production

2020 ◽  
Vol 26 (2) ◽  
pp. 151-156
Author(s):  
Jovan Ciric ◽  
Natasa Jokovic ◽  
Slavica Ilic ◽  
Sandra Konstantinovic ◽  
Dragisa Savic ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Carbon Source ◽  
Enterococcus Faecalis ◽  
Acid Production ◽  
Lactic Acid Production ◽  
Raw Material ◽  
Biodiesel Production ◽  
Waste Glycerol ◽  
Pure Glycerol ◽  
Microbial Utilization

Waste glycerol from biodiesel production is a valuable raw material that has been used to produce valuable microbial metabolites. In this work, the possibility of microbial utilization of waste glycerol obtained as a by-product in biodiesel production from sunflower and rapeseed oil by the lactic acid bacterium Enterococcus faecalis MK3-10A on a laboratory level was studied. For comparison, pure glycerol and glucose were used as carbon sources. The kinetics of the microbial biomass growth, the carbon source utilization, and the lactic acid production were monitored. The bacterium E. faecalis MK3-10A better grew in the media with glucose or pure glycerol as a carbon source, but the lactic acid production rate was the highest (14.6 mg/(ml/day)) in the medium with waste glycerol from the sunflower oil-based biodiesel production. Therefore, this waste glycerol might be a promising carbon source for lactic acidbacteria cultivation and lactic acid production.

scholarly journals Optimization of Lactic Acid Production from Pineapple By-Products and an Inexpensive Nitrogen Source Using Lactiplantibacillus plantarum strain 4O8

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Joel Romial Ngouénam ◽  
Pierre Marie Kaktcham ◽  
Chancel Hector Momo Kenfack ◽  
Edith Marius Foko Kouam ◽  
François Zambou Ngoufack
Keyword(s):  
Lactic Acid ◽  
Carbon Source ◽  
Nitrogen Source ◽  
Acid Production ◽  
Lactic Acid Production ◽  
Nitrogen Sources ◽  
Production Medium ◽  
Optimum Conditions ◽  
Pharmaceutical Industries ◽  
By Products

Lactic acid (LA) is used in food, cosmetic, chemical, and pharmaceutical industries and has recently attracted much attention in the production of biodegradable polymers. The expensive substances including carbon and nitrogen sources involved in its fermentative synthesis and the increasing market demand of LA have prompted scientists to look for inexpensive raw materials from which it can be produced. This research was aimed at determining the optimum conditions of lactic acid (LA) production from pineapple by-products and an inexpensive nitrogen source using Lactiplantibacillus plantarum strain 4O8. After collection and preparation of the carbon source (pineapple by-products) and nitrogen sources (by-products from fish, chicken, and beer brewing industries), they were used for the formulation of 4 different media in terms of nitrogen sources. Then, the proximate compositions of promising nitrogen sources were determined. This was followed by the screening of factors (temperature, carbon source, nitrogen source, MgSO4, MnSO4, FeSO4, KH2PO4, and KHPO4) influencing the production of LA using the definitive plan. Lastly, the optimization process was done using the central composite design. The highest LA productions ( 14.64 ± 0.05   g / l and 13.4 ± 0.02   g / l ) were obtained in production medium supplemented with chicken and fish by-products, respectively, making them the most promising sources of nitrogen. The proximate analysis of these nitrogen sources revealed that their protein contents were 83.00 ± 1.41 % DM and 74.00 ± 1.41 % DM for chicken by-products and fish by-products, respectively. Concerning the screening of factors, temperature, nitrogen source, and carbon source were the factors that showed a major impact on LA production in the production medium containing chicken by-products as nitrogen source. A pineapple by-product concentration of 141.75 g/l, a nitrogen source volume of 108.99 ml/l, and a temperature of 30.89°C were recorded as the optimum conditions for LA production. The optimization led to a 2.73-fold increase in LA production when compared with the production medium without nitrogen source. According to these results, chicken by-products are a promising and an inexpensive nitrogen source that can be an alternative to yeast extract in lactic acid production.

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