Extraction and purification of lactic acid from silages

The aim of this study is to emphasize the potential of membrane technologies and the specifi c performance-limiting borders of pressure-driven (microfi ltration, ultrafi ltration, nanofi ltration, reverse ssmosis) as well as electro-membrane (electrodialysis, electrodialysis using bipolar membranes) techniques for the separation of valuable substances from silage press-juice obtained in green biorefi neries. Depending on the product, nanofi ltration can be considered a partially fractionating technique with great future potential. Electrodialysis turns out to be a suitable separation technique for removing huge amounts of salt and isolating individual valuable substances. However, residual impurities must be taken into account for subsequent separation steps. In any case, further separation processes (e.g. chromatography) must be integrated in future green biorefi nery production plants.

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“…1). [54][55][56][57][58][59][60][61][62][63] In any case, EDB represents an alternative way also with regard to energy consumption in the future.…”

Section: Electrodialysis Using Bipolar Membranes (Edb)mentioning

confidence: 99%

Renewable resources – green biorefinery: separation of valuable substances from fluid–fractions by means of membrane technology

Novalin

Zweckmair

2008

Biofuels Bioprod Bioref

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“…As amostras foram processadas de acordo com o Supelco Bulletin (1998), para então serem submetidas à determinação do ácido lático, por cromatografia líquida (Danner et al, 2000;Molnár-Perl, 2000), e dos ácidos acético, butírico e propiônico, por cromatografia gasosa (Wilson, 1971). Segundo esse método, foi determinada também a porcentagem de etanol.…”

Section: Methodsunclassified

Silagem de grãos úmidos de milho em substituição ao milho seco da ração de frangos de corte criados em dois sistemas

Gonçalves

Sartori

Pezzato

et al. 2005

Pesq. agropec. bras.

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Silagem de grãos úmidos de milho em ração de frangos de corte 1021Silagem de grãos úmidos de milho em substituição ao milho seco da ração de frangos de corte criados em dois sistemas High moisture corn grains silage in substitution of diet dry corn to broilers bred in two systemsAbstract -The aim of this work was to evaluate the inclusion of high moisture corn grains silage, in substitution of dry corn, in diets of broilers bred in conventional and alternative systems. One-day old male Cobb chicks (720) were distributed in randomized blocks, according to a 2x3 factorial consisting of two systems (conventional and alternative), and three levels of silage (0%, 30% and 60%), with four replications per treatment. Means of weight, weight gain, ration consumption, feed conversion, production factor and mortality were obtained in 21, 42 and 49 days old broilers. In the final of the experiment 28 chickens per treatment were used to determine carcass yield, cuts and abdominal fat. The inclusion in diet until 60% of humid grain corn silage, in substitution of dry corn, decreased the ration cost, without affecting performance (in 21, 42 and 49 days old) and carcass yield of broilers (49 days). In alternative breeding system, independently of inclusion level of high moisture corn grains silage, performance was lower, however the economic return was higher.

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“…A recent study has demonstrated that, after separation of proteins from alfalfa press juice, the supernatant can be used as fermentation media for the production of the ammonium lactate, L-lysine-L-Lactate, which acts as intermediates for the production of lactic acid sequence products like lactide (Leiß et al 2010). Another study evaluated the possibility of recovery of lactic acid from various grass silages through a two-step process, in which the crude liquid press extract was pre-treated with ultrafiltration membranes followed by purification with mono-polar electrodialysis (Danner et al 2000). Lactic acid can also be separated from grass silage juice by chromatography using neutral polymeric resin (Thang and Novalin 2008).…”

Section: Processing Of Press Juice To Value-added Productsmentioning

confidence: 99%