Página 1 dos resultados de 47 itens digitais encontrados em 0.001 segundos

Yeast biodiversity from oleic ecosystems: Study of their biotechnological properties

Romo-Sanchez, Sheila; Alves-Baffi, Milla; Arevalo-Villena, Maria; Ubeda-Iranzo, Juan; Briones-Perez, Ana
Fonte: Academic Press Ltd Elsevier B.V. Ltd Publicador: Academic Press Ltd Elsevier B.V. Ltd
Tipo: Artigo de Revista Científica Formato: 487-492
ENG
Relevância na Pesquisa
47.19%
The aim of this study was to know the yeast biodiversity from fresh olive (Olea europaea L.) fruits, olive paste (crush olives) and olive pomace (solid waste) from Arbequina and Cornicabra varieties. Yeasts were isolated from fruits randomly harvested at various olive groves in the region of Castilla La Mancha (Spain). Olive paste and pomace, a byproduct of the processing of this raw material, were also collected in sterile flasks from different oil mills. Molecular identification methodology used included comparison of polymerase chain reaction (PCR) amplicons of their 5.8S rRNA gene and internal transcribed spacers ITS1 and ITS2 followed by restriction pattern analysis (RFLP). For some species, sequence analysis of the 5.8S rDNA gene was necessary. The results were compared to sequences held in public databases (BLAST). These techniques allowed to identify fourteen different species of yeasts, belonging to seven different genera (Zygosaccharomyces, Pichia, Lachancea, Kluyveromyces, Saccharomyces, Candida, Torulaspora) from the 108 yeast isolates. Species diversity was thus considerable: Pichia caribbica, Zygosaccharomyces fermentati (Lachancea fermentati) and Pichia holstii (Nakazawaea holstii) were the most commonly isolated species...

Quantificação de estigmatadienos em azeite de oliva (Olea europea L.) por cromatografia em fase gasosa.; Stigmastadiene quantification in olive oil (Olea europaea L.) by gas chromatography.

Juliana Stefanon Modolo
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 25/07/2007 PT
Relevância na Pesquisa
46.86%
O azeite de oliva é um produto com alto valor nutricional e tem conquistado seu espaço no mercado consumidor devido às suas marcantes características organolépticas. O cultivo e a colheita de olivas e a extração do azeite são atividades trabalhosas e, por isso, o azeite de oliva tem alto custo comercial. Por conseqüência, as tentativas de adulteração deste produto com outros tipos de azeites mais baratos, como o azeite de oliva refinado, por exemplo, é comum. Este trabalho visa despertar um maior interesse dos órgãos de vigilância e de controle de qualidade de azeites de oliva, mostrando a importância da aplicação de metodologias específicas para evidenciar adulterações deste produto. Este estudo propôs a quantificação de estigmastadienos como a principal técnica capaz de identificar fraudes em azeites de oliva extra virgem e virgem. Este método analítico consiste na saponificação da amostra de azeite na presença de padrão interno (colesta-3,5-dieno), extração e fracionamento dos componentes insaponificáveis por cromatografia em coluna aberta, seguida pela identificação e quantificação do estigmasta-3,5-dieno e seu isômero por cromatografia em fase gasosa com detector de ionização de chama. A separação cromatográfica do estigmastadieno foi realizada em coluna capilar de sílica fundida HP-5 (5% difenil 95% dimetil polisiloxano...

Valorisation of olive pomace by solid-state fermentation with Aspergillus species for lipase production

Oliveira, Felisbela Maria Araújo; Moreira, Cláudia; Salgado, José Manuel; Abrunhosa, Luís; Venâncio, Armando; Belo, Isabel
Fonte: WASTES 2013; Centro para a Valorização de Resíduos (CVR) Publicador: WASTES 2013; Centro para a Valorização de Resíduos (CVR)
Tipo: Conferência ou Objeto de Conferência
Publicado em //2013 ENG
Relevância na Pesquisa
67.34%
Pollution by olive mill wastes is a crucial problem in Mediterranean area and their proper management and utilization is demanded. Olive pomace offers excellent properties to produce enzymes by solid-state fermentation (SSF) using filamentous fungi. Particularly for lipase production, since it has residual content of olive oil. The aim of this work was to optimize the production of lipase by Aspergillus ibericus MUM 03.49, Aspergillus niger MUM 03.58 and Aspergillus tubingensis MUM 06.152, under SSF of olive pomace. A Taguchi L-9 orthogonal array based on 4 factors at 3 levels (ratio between olive pomace and wheat bran (OP:WB), NaNO3, Czapek nutrients and time) was implemented. SSF was carried out in Erlenmeyer flasks of 500 mL and lipase activity was measured using p-nitrophenyl butyrate as substrate. Results showed for all fungi that the factor with most significant effect on lipase production was the mixture OP:WB, concluding that the presence of wheat bran on substrate favored lipase production. NaNO3 concentration and time presented some effect and presence of Czapek nutrients did not added significant advantages on lipase production. A. ibericus was the best lipase producer, being a promising microorganism for lipase production. Under optimized conditions it produced 20.78 U/gds of lipase.

Management of agro-industrial wastes: utilization of exhausted grape mark as co-substrate with olive pomace for cellulases production by SSF

Salgado, José Manuel; Oliveira, Felisbela Maria Araújo; Abrunhosa, Luís; Venâncio, Armando; Belo, Isabel
Fonte: Universidade do Minho Publicador: Universidade do Minho
Tipo: Conferência ou Objeto de Conferência
Publicado em /09/2013 ENG
Relevância na Pesquisa
47.19%
The reutilization of biological wastes is of great interest since, due to legislation and environmental reasons, the industry is increasingly being forced to find an alternative use for its residues. Moreover, the use of these wastes considerably reduces the production costs. Olive oil and wine production are the most common food processing activities in the countries of southern Europe. Environmental pollution posed by olive mill wastes is a growing problem especially in the Mediterranean region. Research into finding new uses for wastes from olive oil and wine industry will allow obtaining not only economic benefits, but also environment improvements in areas where industries are located. In previous studies, several wastes from wineries and olive mills were tested for cellulase production by solid state fermentation (SSF). It was observed that mixture of exhausted grape mark (EGM) with olive pomace (OP) were suitable substrates for cellulase production. After fungi screening study, Aspergillus ibericus showed more cellulase activity. To optimize cellulase production a full factorial experimental design 32 was planned. The independent variables were % of EGM mixture with olive pomace and urea supplementation and response variable was cellulase activity (U/gds). The obtained results showed that these agro-industrial wastes were suitable for the production of cellulases...

Influence of moisture content, temperature and inoculum size on lipase production by filamentous fungi under solid-state fermentation of olive pomace

Oliveira, Felisbela Maria Araújo; Salgado, José Manuel; Abrunhosa, Luís; Venâncio, Armando; Belo, Isabel
Fonte: Universidade do Minho Publicador: Universidade do Minho
Tipo: Conferência ou Objeto de Conferência
Publicado em 04/06/2013 ENG
Relevância na Pesquisa
47.13%
Pollution by olive mill wastes is a crucial problem in the Mediterranean area and proper management is necessary. Olive pomace, a solid by-product generated by the olive oil two phase extraction process, is an acidic and very humid material, rich in organic matter, potassium, nitrogen, carbohydrates, phenols and also contains residual fats, which make an interesting substrate for lipase production under solid-state fermentation. The aim of this work was to optimise moisture content (MC), temperature and inoculum size, in order to improve lipase production by Aspergillus ibericus MUM 03.49, Aspergillus niger MUM 03.58 and Aspergillus tubingensis MUM 06.152, under solid-state fermentation (SSF) of olive pomace mixed with wheat bran. Firstly, a full factorial design of experiments was implemented in order to investigate the effect of MC (70%, 75% and 80% wet basis) and temperature (25 ºC, 30 ºC and 35 ºC) on its production. SSF was carried out in 500 mL Erlenmeyer flasks, containing 30 g solid dry substrate. Lipase activity was measured by colorimetric assay, using p-nitrophenyl butyrate as substrate. In general, MC presented a significant effect (p < 0.05) on lipase production. Temperature presented a significant effect only for A. ibericus. Maximum lipase production was obtained at 70% of MC for all microorganisms...

Contribuição do sector do azeite para a produção de biodiesel

Sebadelhe, Cláudia Sofia Moutinho
Fonte: Universidade Técnica de Lisboa Publicador: Universidade Técnica de Lisboa
Tipo: Dissertação de Mestrado
Publicado em //2008 POR
Relevância na Pesquisa
47.28%
Mestrado em Olivicultura, Azeite e Azeitona de mesa - Instituto Superior de Agronomia; The olive oil sector, with a strong tradition in Portugal, can be a source of raw materials for biodiesel production. The olives infected by plages and diseases, will generate lampante virgin olive oil without food quality and the crude olive pomace oil extracted from the pomace is not appropriate for food consumption. The purpose of the present investigation was to study the biodiesel production from lampante virgin olive oil and crude olive pomace oil with acid values much higher than 1 %. In this study, two different processes for biodiesel production were tested and compared with these raw materials. One, by using the traditional alkaline catalyzed transesterification process, the other by a two step process using acid catalyzed esterification followed by alkaline catalyzed transesterification. The acid catalyzed esterification process was optimized by application the response surface methodology. The highest yields of fatty acid methyl esters were obtained by the two step process. The properties of the biodiesel obtained from both raw materials were determined and most of the parameters were in accordance to the specifications of biodiesel standard. Only the oxidative stability did not reach the minimum value established in these specifications.

Otimização de meios de cultura para a produção de xilitol com base em hidrolisados hemicelulósicos de bagaço de azeitona extratado

Morais, Ana Rita Colaço
Fonte: ISA/UTL Publicador: ISA/UTL
Tipo: Dissertação de Mestrado
Publicado em //2012 POR
Relevância na Pesquisa
47.02%
Mestrado em Engenharia Alimentar - Instituto Superior de Agronomia; The extracted olive pomace (EOP) is the by-product of the olive pomace oil extraction industry, currently used in low value energy applications. In this work, it was studied the valorisation of hemicellulosic fraction of this material to development of the production of pentose-rich hydrolysates for subsequent bioconversion into xylitol. Given the high content of phenolic compounds, some high value-added, it was studied the aqueous pre-extraction (APE). The optimum conditions for APE were found at 100 ºC, 60 min and a liquid to solid ratio (LSR) of 5 g·g-1. To obtain hemicellulosic hydrolysates, it was studied for both APE-treated and untreated EOP using dilute sulphuric acid (3.5%, w/w) at 130ºC for 130 min at different LSR (3, 4 and 5). The hydrolysates obtained were detoxified using different methods which include the adsorption to NaOH and HCl activated charcoal, anionic resins, concentration by evaporation and membranes (nanofiltration). The impact of hydrolysis LSR, detoxification method and supplementation on xylitol production by the yeast D. hansenii, was evaluated. Nanofiltration was the method that enabled the highest removal of inhibitors. The highest xylitol volumetric productivity was 0.30 g·L-1·h-1 (yield 0.42 g·g-1) was obtained for resin-detoxified hydrolysates (pH 5.5). The highest yield...

Detoxification of hemicellulosic hydrolysates from extracted olive pomace by diananofiltration

Brás, Teresa; Guerra, Vera; Torrado, Ivone; Lourenço, Pedro; Carvalheiro, Florbela; Duarte, Luís C.; Neves, Luisa A.
Fonte: Elsevier Publicador: Elsevier
Tipo: Artigo de Revista Científica
Publicado em //2014 ENG
Relevância na Pesquisa
67.18%
Xylitol can be obtained from the pentose-rich hemicellulosic fraction of agricultural residues, such as extracted olive pomace, by fermentation. Dilute acid hydrolysis of lignocellulosic materials, produces the release of potential inhibitory compounds mainly furan derivatives, aliphatic acids, and phenolic compounds. In order to study the potential on the increase of the hydrolysate fermentability, detoxification experiments based on diananofiltration membrane separation processes were made. Two membranes, NF270 and NF90, were firstly evaluated using hydrolysate model solutions under total recirculation mode, to identify the best membrane for the detoxification. NF270 was chosen to be used in the diananofiltration experiment as it showed the lowest rejection for toxic compounds and highest permeate flux. Diananofiltration experiments, for hydrolysate model solutions and hydrolysate liquor, showed that nanofiltration is able to deplete inhibitory compounds and to obtain solutions with higher xylose content. Conversely to non-detoxified hydrolysates, nanofiltration detoxified hydrolysates enabled yeast growth and xylitol production by the yeast Debaryomyces hansenii, clearly pointing out that detoxification is an absolute requirement for extracted olive pomace dilute acid hydrolysate bioconversion.

Production of bio-hydrocarbons by hydrotreating of pomace oil

Pinto, Filomena; Varela, F. T.; Gonçalves, Margarida; André, Rui Neto; Costa, Paula; Mendes, Benilde
Fonte: Elsevier Publicador: Elsevier
Tipo: Artigo de Revista Científica
Publicado em //2014 ENG
Relevância na Pesquisa
57.44%
Olive pomace oil is a by-product from the olive oil industry that is still being used in the food industry as a low value vegetable oil. Crude olive pomace oil needs to be refined and is blended with virgin olive oils before being used as edible oil. The detection of toxic compounds led to more restricted legislation and to the search of alternative valorisation processes, such as hydrotreating to obtain bio-hydrocarbons. Hydrotreating of olive pomace oil at moderate temperatures (from 300 to 430 C) and in presence of initial hydrogen pressure of 1.1 MPa led to triglycerides destruction and to their conversion into a large range of organic compounds with predominance to hydrocarbons. Even without any catalyst, conversions into hydrocarbons were always higher than 90% (v/v). Catalyst presence, such as: CoMo/Al2O3, FCC (fluid catalytic cracking) or HZSM-5 changed hydrogenated liquids composition. The highest content of alkanes was obtained with CoMo catalyst, while FCC and HZSM-5 led to the highest contents of aromatic compounds. The results obtained showed that olive pomace oil can be efficiently converted into bio-hydrocarbons with a wide range of applications. It was also studied the effect of pyrolysing olive pomace oil prior to its hydrotreating. Pyrolysis pre-treatment seems to have favoured hydrotreating process by promoting initial cracking reactions. Thus...

Antithrombotic and Antiatherosclerotic Properties of Olive Oil and Olive Pomace Polar Extracts in Rabbits

Tsantila, Nektaria; Karantonis, Haralabos C.; Perrea, Despina N.; Theocharis, Stamatios E.; Iliopoulos, Dimitrios G.; Antonopoulou, Smaragdi; Demopoulos, Constantinos A.
Fonte: Hindawi Publishing Corporation Publicador: Hindawi Publishing Corporation
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
46.94%
Olive oil polar lipid (OOPL) extract has been reported to inhibit atherosclerosis development on rabbits. Olive pomace polar lipid (PPL) extract inhibits PAF activity in vitro and the most potent antagonist has been identified as a glycerylether-sn-2-acetyl glycolipid with common structural characteristics with the respective potent antagonist of OOPL. The aim of this study was to investigate the effect of PPL on early atherosclerosis development on rabbits and to compare it with the antiatherosclerotic effect of OOPL. OOPL and PPL inhibition potency, towards both PAF action and PAF binding, was tested in vitro on washed rabbit platelets. Consequently, rabbits were divided into three groups (A, B, and C). All groups were fed atherogenic diet for 22 days. Atherogenic diets in groups B and C were enriched with OOPL and PPL, respectively. At the end of the experimental time, rabbits were euthanized and aortic samples were examined histopathologically. OOPL and PPL inhibited PAF-induced aggregation, as well as specific PAF binding, with PPL being more potent. Free and bound PAF levels and PAF-AH activity were significantly elevated at the end of the experimental time. Plasma total cholesterol, HDL cholesterol, LDL cholesterol, and triglycerides levels were also found increased. Groups B and C exhibited significantly increased values of EC50 compared to group A. Histopathological examination revealed that the development of early atherosclerosis lesions in groups B and C were significantly inhibited compared to group A. Significant differences were noted in the early atherosclerosis lesions between groups B and C...

Mixtures of Olive Pomace with Different Nitrogen Sources for the Control of Meloidogyne spp. on Tomato

Rodríguez-Kábana, R.; Estaún, V.; Pinochet, J.; Marfá, O.
Fonte: Society of Nematologists Publicador: Society of Nematologists
Tipo: Artigo de Revista Científica
Publicado em /12/1995 EN
Relevância na Pesquisa
47.02%
The efficacy of mixtures of dry olive (Olea europea) pomace with biuret, guanidine, and melamine for control of root-knot nematodes (Meloidogyne spp.) on tomato (Lycopersicon esculentum) was studied in greenhouse experiments. Olive pomace (OP) applied pre-plant at 10 g/kg soil was phytotoxic. Mixtures of OP (10 g/kg soil) with biuret or guanidine at 200-300 mg/kg soil reduced or eliminated the phytotoxic effect, controlled root-knot nematodes, and increased soil esterase activity indicative of microbial activity. The addition of biuret or guanidine without OP to soil at rates <300 mg/kg soil did not control root-knot nematodes. Melamine applied at 100-400 mg/kg soil was phytotoxic as were mixtures of melamine with OP. Treatment of OP with anhydrous ammonia increased N content of the material. In another greenhouse experiment, NH₃-treated OP added to soil was not phytotoxic to tomato, suppressed root-knot nematodes, and increased soil esterase activity. Greenhouse and microplot experiments with OP plus chicken litter demonstrated the efficacy of these combination amendments to control root-knot nematodes and increase tomato yields in Meloidogyne-infested soil.

Evaluation of the in Vitro Anti-Atherogenic Properties of Lipid Fractions of Olive Pomace, Olive Pomace Enriched Fish Feed and Gilthead Sea Bream (Sparus aurata) Fed with Olive Pomace Enriched Fish Feed

Nasopoulou, Constantina; Gogaki, Vassiliki; Stamatakis, Giorgos; Papaharisis, Leonidas; Demopoulos, Constantinos A.; Zabetakis, Ioannis
Fonte: MDPI Publicador: MDPI
Tipo: Artigo de Revista Científica
Publicado em 30/09/2013 EN
Relevância na Pesquisa
47.5%
Given the pivotal role of Platelet-Activating-Factor (PAF) in atherosclerosis and the cardio-protective role of PAF-inhibitors derived from olive pomace, the inclusion of olive pomace in fish feed has been studied for gilthead sea bream (Sparus aurata). The aim of the current research was to elucidate the anti-atherogenic properties of specific HPLC lipid fractions obtained from olive pomace, olive pomace enriched fish feed and fish fed with the olive pomace enriched fish feed, by evaluating their in vitro biological activity against washed rabbit platelets. This in vitro study underlines that olive pomace inclusion in fish feed improves the nutritional value of both fish feed and fish possibly by enriching the marine lipid profile of gilthead sea bream (Sparus aurata) with specific bioactive lipid compounds of plant origin.

Use of Dried Stoned Olive Pomace in the Feeding of Lactating Buffaloes: Effect on the Quantity and Quality of the Milk Produced

Terramoccia, S.; Bartocci, S.; Taticchi, A.; Di Giovanni, S.; Pauselli, M.; Mourvaki, E.; Urbani, S.; Servili, M.
Fonte: Asian-Australasian Association of Animal Production Societies (AAAP) and Korean Society of Animal Science and Technology (KSAST) Publicador: Asian-Australasian Association of Animal Production Societies (AAAP) and Korean Society of Animal Science and Technology (KSAST)
Tipo: Artigo de Revista Científica
Publicado em /07/2013 EN
Relevância na Pesquisa
46.77%
Dried stoned olive pomace (DSOP) was administered to dairy water buffaloes, and their productive performance and milk composition were analysed. Sixteen pluriparous lactating buffaloes were divided into two uniform groups (control and experimental), taking into consideration the following parameters: milk production (2,192 and 2,102 kg) and duration of lactation (254 and 252 d) of the previous year, distance from calving (51 and 43 d), milk production (9.71 and 10.18 kg/d), body condition score (BCS) (6.44 and 6.31) and weight (617 and 653 kg) at the beginning of the trial. Both diets had the same formulation: second cut alfalfa hay 20%, corn silage 42%, concentrate 38% but the two concentrates differed in their formulation, the experimental one contained 15.50% of DSOP as fed. The employed DSOP showed high amounts of secoiridoids, such as 3,4-dihydroxyphenylethanol (3,4-DHPEA) (1.2 g/kg DM), 3,4-dihydroxyphenylethanol-elenolic acid di-aldehyde (3,4-DHPEA-EDA) (12.6 g/kg DM), p-hydroxyphenylethanol-elenolic acid di-aldehyde (p-HPEA-EDA) (5.6 g/kg DM) and lignans, which are known to be powerful bioactive compounds. The control diet had an energy-protein content of 0.86 Milk FU/kg DM and 143.3 g/kg DM of crude protein, whereas the experimental diet of 0.87 Milk FU/kg DM and 146.6 g/kg DM of crude protein. Each animal of the two groups received 17 kg DM/d and each buffalo of the experimental group...

Control of Several Emissions during Olive Pomace Thermal Degradation

Miranda, Teresa; Nogales, Sergio; Román, Silvia; Montero, Irene; Arranz, José Ignacio; Sepúlveda, Francisco José
Fonte: MDPI Publicador: MDPI
Tipo: Artigo de Revista Científica
Publicado em 13/10/2014 EN
Relevância na Pesquisa
46.77%
Biomass plays an important role as an energy source, being an interesting alternative to fossil fuels due to its environment-friendly and sustainable characteristics. However, due to the exposure of customers to emissions during biomass heating, evolved pollutants should be taken into account and controlled. Changing raw materials or mixing them with another less pollutant biomass could be a suitable step to reduce pollution. This work studied the thermal behaviour of olive pomace, pyrenean oak and their blends under combustion using thermogravimetric analysis. It was possible to monitor the emissions released during the process by coupling mass spectrometry analysis. The experiments were carried out under non-isothermal conditions at the temperature range 25–750 °C and a heating rate of 20 °C·min−1. The following species were analysed: aromatic compounds (benzene and toluene), sulphur emissions (sulphur dioxide), 1,4-dioxin, hydrochloric acid, carbon dioxide and nitrogen oxides. The results indicated that pollutants were mainly evolved in two different stages, which are related to the thermal degradation steps. Thus, depending on the pollutant and raw material composition, different emission profiles were observed. Furthermore...

Aspergillus ibericus lipase production by solid-state fermentation of olive pomace

Oliveira, Felisbela Maria Araújo; Abrunhosa, Luís; Venâncio, Armando; Belo, Isabel; Pérez-Rodríguez, N.; Domínguez, J. M.
Fonte: Taylor & Francis Group Publicador: Taylor & Francis Group
Tipo: Parte de Livro
Publicado em //2015 ENG
Relevância na Pesquisa
46.77%
Lipases are versatile catalysts with many applications, such as in food and detergents industries. Lipases can be produced by solid-state fermentation (SSF) using agroindustrial wastes. In addition, A. ibericus has been pointed as an interesting fungus to produce lipase through SSF of olive pomace (OP). The aim of this work was to optimize the production of lipase by A. ibericus under SSF using OP and wheat bran (WB). Additionally, extraction conditions of lipase were optimized. At optimum conditions lipase production and recovery improved 2-fold, yielding 223 ± 5 U/g. Optimum SSF conditions were using 30 g in a ratio of 1:1 (dry basis) of OP and WB supplemented with 0.4 g (NH4)2SO4 at 60% of moisture content and incubated at 30 ºC during 7 days. The extraction of lipase was improved using 7.5 mL/g solid residues of 1% Triton X-100 homogenized for 0.5 hour at 250 rpm and 24 ºC.

Sonication of olive pomace to improve xylanases production by SSF

Leite, P.; Salgado, José Manuel; Abrunhosa, Luís; Venâncio, Armando; Belo, Isabel
Fonte: Taylor & Francis Publicador: Taylor & Francis
Tipo: Conferência ou Objeto de Conferência
Publicado em /09/2015 ENG
Relevância na Pesquisa
47.13%
Olive mill wastes are an important environmental problem in the areas where they are generated. Portugal is an important producer of olive oil in the world, thus it is interesting to find the most suitable valorization strategy to exploit their wastes which are generated in huge quantities in short periods of time. In this study, it was used the olive pomace as solid substrate to produce xylanases and cellulases by filamentous fungi. To improve the enzymes production ultrasounds pretreatment of olive pomace was evaluated. The results showed that the sonication led to a 3-fold increase of xylanase activity and a decrease of cellulase activity, indicating that ultrasounds treatment attacked the integrity of cell walls and increased the accessibility of hemicelluloses inducing the xylanases production by fungi.

Orujos de dos fases almacenados en balsas; Two phases olive pomace storaged in ponds

Ramos Hinojosa, Álvaro E.; Ruiz Méndez, Mª Victoria
Fonte: Consejo Superior de Investigaciones Científicas (España) Publicador: Consejo Superior de Investigaciones Científicas (España)
Tipo: Artículo
SPA
Relevância na Pesquisa
67.46%
During the harvesting period 1999-2000, real samples of two phases olive pomace were taken from storage ponds in two extraction facilities located in Southern region of Spain, every month until a maximum of five months. In addition, lots of two phases olive pomace and second-centrifuged two phases olive pomace were divided in closed recipients and, also, in opened recipients, and were stored in laboratory at 36ºC for 0, 1, 2, 4 and 6 months. Samples were analysed for moisture and fat content, and solvent-extracted; the resulting oils were analysed for acidity, fatty acid composition, polar compounds and triglycerides. The results indicate that oil deterioration increases throughout the storage period, particularly those oils extracted from surface and from second-centrifuged two phases olive pomace. The surface/volume ratio in the ponds should be as low as possible. Special attention should be paid to the storage of two phases olive pomace, establishing a maximum of two months in all cases.; Durante la campaña 1999-2000 se han tomado muestras reales de orujo de balsas de almacenamiento, cada mes hasta un máximo de 5 meses, y de lotes de orujo de dos fases almacenados en el laboratorio, en recipientes cerrados y abiertos, a 36 ºC durante 0...

Treatment technologies of liquid and solid wastes from two-phase olive oil mills; Tecnologías de tratamiento de los efluentes líquidos y residuos sólidos resultantes del proceso de elaboración del aceite de oliva por centrifugación en dos fases

Borja Padilla, Rafael; Raposo Bejines, Francisco; Rincón, Bárbara
Fonte: Consejo Superior de Investigaciones Científicas (España) Publicador: Consejo Superior de Investigaciones Científicas (España)
Tipo: Artículo
ENG
Relevância na Pesquisa
57.12%
Over the last 10 years the manufacture of olive oil has undergone important evolutionary changes in the equipment used for the separation of olive oil from the remaining components. The latest development has been the introduction of a two-phase centrifugation process in which a horizontally-mounted centrifuge is used for a primary separation of the olive oil fraction from the vegetable solid material and vegetation water. Therefore, the new two-phase olive oil mills produce three identifiable and separate waste streams. These are: 1) the wash waters from the initial cleansing of the fruit; 2) the wash waters from the secondary centrifuge and 3) the aqueous solid residues from the primary centrifugation. As well as offering process advantages they also reduce the water consumption of the mill. The introduction of this technology was carried out in 90% of Spanish olive oil factories. Therefore, the new twophase olive mill effluents (TPOME) are made up of the mixture of effluents (1) and (2), the total volume of TPOME generated being around 0.25 l/kg of olives processed. In addition, the solid residue (two-phase olive pomace, TPOP) has a high organic matter concentration giving an elevated polluting load and it cannot be easily handled by traditional technology which deals with the conventional three-phase olive cake. So...

Valorization of olive pomace through combination of biocatalysis with supercritical fluid technology

Nogueira, João Humberto Gonçalves Francisco
Fonte: Universidade Nova de Lisboa Publicador: Universidade Nova de Lisboa
Tipo: Dissertação de Mestrado
Publicado em /09/2015 ENG
Relevância na Pesquisa
67.44%
A supercritical carbon dioxide (scCO2) based oil extraction method was implemented on olive pomace (alperujo), and an oil yield of 25,5 +/- 0,8% (goil/gdry residue) was obtained. By Soxhlet extraction with hexane, an oil extraction yield of 28,9 +/- 0,8 % was obtained, which corresponds to an efficiency of 88,4 +/- 4,8 % for the supercritical method. The scCO2 extraction process was optimized for operating conditions of 50 MPa and 348,15 K, for which an oil loading of 32,60 g oil/kg CO2 was calculated. As a proof of concept, olive pomace was used as feedstock for biodiesel production, in a process combining the use of lipase as a catalyst with the use of scCO2 as a solvent, and integrating the steps of oil extraction, oil to biodiesel transesterification and subsequent separation of the latter. In the conducted experiments, FAME (fatty acid methyl ester) purities of 90% were obtained, with the following operating parameters: an oil:methanol molar ratio of 1:24; a residence time of 7,33 and 11,6 mins; a pressure of 40 MPa; a temperature of 313,15 K; and Lipozyme (Mucor miehei; Sigma-Aldritch) as an enzyme. However, oscillations of FAME purity were registered throughout the experiments, which could possibly be due to methanol accumulation in the enzymatic reactor. Finally...

Soil management systems: Effects on soil properties and weed flora

Ferrara,G.; Mazzeo,A.; Matarrese,A.M.S.; Pacifico,A.; Fracchiolla,M.; Al Chami,Z.; Lasorella,C.; Montemurro,P.; Mondelli,D.
Fonte: South African Journal of Enology and Viticulture Publicador: South African Journal of Enology and Viticulture
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/01/2015 EN
Relevância na Pesquisa
47.18%
A three-year experiment was conducted in order to evaluate the effects of three different soil management systems in a vineyard (organic mulch with exhausted olive pomace at 6 cm thick, weed mowing and herbicide application) on soil physicochemical characteristics and weed flora. A variety of data was collected throughout the trial, such as soil analyses, weed surveys and phytotoxicity tests. The results show that the exhausted olive pomace was able to increase the K and Mg content and exerted good control over weeds, and also had an effect on the weed flora composition. Although further research is needed, it is possible to conclude that the mode of action of the exhausted olive pomace was both mechanical (thickness of the layer) and phytochemical for the release of phytotoxic compounds (allelochemicals).