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Dissertations / Theses on the topic 'Gum arabic'

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Published: 4 June 2021

Last updated: 26 July 2025

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1

Manning, Harriet. "The fractionation of gum arabic using synthetic membranes." Thesis, University of Bath, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.687326.

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Gum arabic is a natural product used widely in the food industry as an emulsifier and stabilising agent. The gum contains 3 main fractions: an arabinogalactan (~80 wt%; AG) fraction, a glycoprotein (~ 2 wt%; GP) fraction and an arabinogalactan-protein complex (~18 wt%; AGP). This AGP fraction is largely responsible for the functional properties of gum arabic and, due to natural variation, the proportion of AGP within a gum arabic batch varies enormously. There is industrial interest, therefore, in fractionating the gum arabic to allow creation of a more homogenous product, as well as new produ

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2

Randall, Richard Christopher. "Molecular characterisation and functional properties of gum arabic." Thesis, University of Salford, 1992. http://usir.salford.ac.uk/43001/.

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Semi-PreParative gel permeation chromatography (gpc) was used to isolate several molecular mass components of gum arabic. The u. v. (218 nm) gpc elution profile showed the presence of several prominent peaks; however, only one major peak (FAw 3.8 x 10-9 g moll) and a minor peak (FAw 1.45 x 106 g mol-1) were observed in the differential refractive index (R. I. ) gpc elution profile. The Rl. molecular mass distribution profile was also shown to be representative of the true mass distribution of the gum. Gram quantities of three apparently "pure" components of gum arabic were prepared using hydro

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3

McDougal, Fiona Janet. "Studies on gum exudates, with particular reference to gum Arabic (Acacia senegal) and other Acacia species." Thesis, University of Edinburgh, 1987. http://hdl.handle.net/1842/11112.

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4

Makonda, Fortunatus B. S. "Gum arabic studies in Tanzania : production, utilization and economic potentials." Thesis, Bangor University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.401803.

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5

Masmas, Ahmad Ben Ahmad Salem. "Gum arabic and constituent sugars studied by electron spin resonance." Thesis, Brunel University, 1991. http://bura.brunel.ac.uk/handle/2438/7869.

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6

Menzies, Alan Robert. "Characterisation of gum arabic using physical, chemical and immunochemical techniques." Thesis, University of Salford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357114.

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7

Creel, Rachel Elaine. "Effects of acacia gum on post-harvest qualit of cut flowers." Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Summer/Theses/CREEL_RACHEL_5.pdf.

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8

Hamouda, Yasir. "Factors affecting the quality of Acacia senegal gums." Thesis, University of Chester, 2017. http://hdl.handle.net/10034/620895.

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Gum arabic is a natural gummy exudate from acacia trees and exhibits natural built-in variations commonly associated with hydrocolloids. This study is concerned with the determination of factors which could influence its properties and functionality. These factors include origin (location, soil type, rainfall), different collections, age of the trees and storage condition. Previous studies acknowledged the influence of some of these factors but somehow lack providing definitive answers to questions being asked by the end user and required for the development of Gum arabic industry in Sudan. Lo

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9

Elhadi, Hanan. "Evaluation of gum arabic reforestation as a measure for combating desertification in the gum belt area of Sudan." Weikersheim Margraf, 2008. http://d-nb.info/993761275/04.

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10

Wadhawan, Kirty. "Factors Influencing the Formation of Zein and Gum Arabic Complex Coacervates." Thesis, North Dakota State University, 2014. https://hdl.handle.net/10365/27345.

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Complex Coacervates are mixtures of biopolymers such as proteins and polysaccharides. The objectives of this research were to (1) determine the optimum biopolymer ratio and pH for the formation of Zein protein and gum arabic complex coacervates, (2) determine the stability of Zein: GA coacervates as an emulsifier using flax oil, Transglutaminase (Tgase), Tween 80, and Span 80 (surfactants), and (3) determine optimum temperature for the stability of formed Zein: GA complex coacervates. The optimum ratio, pH and temperature were determined using turbidimetric and Zeta (?) potential analysis. Ana

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11

Chikamai, Elijah Nandi Ben. "The availability, quality and processing aspects of gum arabic from Kenya." Thesis, Bangor University, 1994. https://research.bangor.ac.uk/portal/en/theses/the-availability-quality-and-processing-aspects-of-gum-arabic-from-kenya(4cd2f000-e5d1-49d9-ae42-0f3835c59668).html.

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Four aspects on gum arabic from Kenya were examined in this Thesis; resource availability, physical and chemical properties, evaluation of methods for monitoring and quality control and processing. Under resource availability, provisional Acacia sehegal maps were produced showing that the resource occupies 14%, 2O% and 37% of Isiolo District, south western Marsabit and Turkana Districts respectively. The main source of gum arabic was identified as A. senegal var. kerensis and was observed growing mostly in patches with high stocking on hills and occasionally along luggas (dry river streams). T

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12

Krumnow, April Anne. "Preserving biological materials in protective polymers." Auburn, Ala., 2005. http://repo.lib.auburn.edu/2005%20Fall/Dissertation/KRUMNOW_APRIL_38.pdf.

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13

Gashua, Ibrahim Babale. "An investigation of the molecular structure, composition and biophysical properties of gum Arabic." Thesis, University of Wolverhampton, 2016. http://hdl.handle.net/2436/608784.

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Acacia senegal and Acacia seyal are important agroforestry cash crops indigenous to several countries of sub-Saharan Africa, including Nigeria. The gum exudate produced by these species is termed gum Arabic which is an approved food additive (E414), primarily used as an emulsifier. In the current study, the molecular structure, composition and biophysical properties of gum samples harvested from mature trees of Acacia senegal at two specific ecolocations in Nigeria (NG1 and NG2), have been investigated together with two previously characterised gum samples harvested from A. senegal and A. seya

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14

Atgié, Marina. "Composition and structure of gum Arabic in solution and at oil-water interfaces." Thesis, Toulouse, INPT, 2018. http://www.theses.fr/2018INPT0024/document.

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La gomme arabique est un exsudat d’arbre qui est essentiellement utilisée pour ses propriétés stabilisantes et émulsifiantes. Ce produit naturel est un mélange complexe de protéines et de polysaccharides liés de façons covalentes, qui différent de part leur masse molaire et leur hydrophobicité. Malgré le grand nombre d’études existantes dans littérature sur la structure et les propriétés interfaciales de la gomme arabique, la compréhension de la relation entre la composition interfaciale, la structuration interfaciale et la métastabilité d’émulsions restent mal comprises à ce jour compliquée.

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15

Cardoso, Ana Sofia. "In vitro studies of gum arabic-coated magnetic nanoparticles with mammalian cell cultures." Master's thesis, Faculdade de Ciências e Tecnologia, 2008. http://hdl.handle.net/10362/5794.

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Dissertação apresentada na Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa para obtenção do grau de Mestre em Biotecnologia<br>The aims of this work were the functionalization of magnetic nanoparticles (MNPs)with Gum Arabic (GA) and the study of the effect of these modified particles on the growth and survival of mammalian cell cultures. MNPs consisting of Fe3O4 were synthesized by the Massart Method and further functionalized with GA by adsorption and covalent coupling via GA amino or carboxylic acid groups. The GA adsorption and binding isotherms displayed a Langmuir ty

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16

Creel, Sarah Frances. "Effect of acacia gum on bare root nursery crops and in cutting propagation." Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Summer/Theses/CREEL_SARAH_14.pdf.

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17

Hayward, Emily. "Investigating fouling and cleaning during the filtration of Gum Arabic to save water and reduce energy." Thesis, University of Bath, 2016. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.698953.

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18

Leonor, Sérgio Jacintho. "Estudos dosimétricos de tecidos duros e alimentos por ressonância paramagnética eletrônica." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/59/59135/tde-26062012-151724/.

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Este trabalho consiste no estudo e nas aplicações da dosimetria por Ressonância Paramagnética Eletrônico (RPE). Em uma tentativa de realizar a dosimetria retrospectiva do esmalte dentário através do menor método invasivo possível utilizamos espectrômetros de Ressonância Paramagnética Eletrônico (RPE), operando em Banda - X e Banda - K, visando determinar as condições que poderiam ser usados em casos de exposições acidentais. Primeiro, um pequeno prisma de esmalte foi removido e um almofariz de ágata foi utilizado para triturar este prisma até que as partículas atinjam um diâmetro de cerca de

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19

Penim, Diana Filipa Lopes. "Microencapsulação de própolis em matrizes de polissacáridos e estudos de libertação controlada." Master's thesis, ISA/UL, 2015. http://hdl.handle.net/10400.5/8524.

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Mestrado em Engenharia Alimentar - Instituto Superior de Agronomia<br>Própolis is a resin produced by bees, which has several bioactive properties, the most important being its antioxidant activity. In the present work we proceeded to the microencapsulation, by spray drying, of a própolis ethanolic extract by using gum arabic, inulin and chitosan as a coating material. The ethanol extract analyzed própolis presented a quantity of phenolic compounds of about 44.3 mg GAE / g. In relation to the antioxidant activity that was 0.191 M Trolox / g of propolis and 0.251 M Trolox / g of propolis by DPP

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20

ANDRADE, Kelita Carlos Silva. "Avalia??o de propriedades qu?micas e f?sicas da goma de cajueiro processada por extrus?o termopl?stica." Universidade Federal Rural do Rio de Janeiro, 2012. https://tede.ufrrj.br/jspui/handle/jspui/1871.

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Submitted by Jorge Silva (jorgelmsilva@ufrrj.br) on 2017-07-11T19:50:40Z No. of bitstreams: 1 2012 - Kelita Carlos Silva Andrade.pdf: 1653019 bytes, checksum: 809493b3b663dca4af908465e310983c (MD5)<br>Made available in DSpace on 2017-07-11T19:50:40Z (GMT). No. of bitstreams: 1 2012 - Kelita Carlos Silva Andrade.pdf: 1653019 bytes, checksum: 809493b3b663dca4af908465e310983c (MD5) Previous issue date: 2012-05-04<br>Tropical countries such, as Brazil, are the custodians of a great variety of sources of plant polysaccharides known and others not yet explored that have great potential in indu

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21

Morrison, N. A. "Degradative and analytical studies of plant gum exudates with particular reference to gum arabic (Acacia senegal) (i) ; The mechanism of interaction between unlike cellulosic ethers and galactomannans in solution (ii)." Thesis, University of Edinburgh, 1993. http://hdl.handle.net/1842/12693.

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Gum arabic was exposed to varying degrees of ionising gamma irradiation. The result confirms the lability of certain sugar and amino acid residues in the gum structure. A chemical deproteination was carried out on a gum arabic solution using butan-1-o1, and confirms previous results which indicate that the protein content of gum arabic cannot be totally isolated from the polysaccharide structure. Mild sequential Smith degradations were carried out on gum arabic, these degradations were less structurally destructive than previous periodate oxidations. Gum arabic was also fractionated by its abi

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22

Sarr, Mame Sokhna. "Morphological and Physiological Responses of Senegalia senegal (L.) Britton Provenances to Drought, Salinity, and Fertility." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/85833.

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Increasing drought and salinity tolerances in economically important trees adapted to dry land areas is key challenge for maintaining the socioeconomic welfare of dry land areas. Strategies to improve drought and salt tolerance must examine the tree physiological mechanisms that link to the trees survival and growth. This study examined physiological adaptive traits allowing Senegalia senegal to grow better in both saline and dry lands. We conducted two greenhouse experiments and one field study to characterize growth, photosynthetic capacity, water use efficiency (WUE) and gum arabic yield po

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23

Adam, Hassan Elnour. "Integration of remote sensing and GIS in studying vegetation trends and conditions in the gum arabic belt in North Kordofan, Sudan." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-67657.

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The gum arabic belt in Sudan plays a significant role in environmental, social and economical aspects. The belt has suffered from deforestation and degradation due to natural hazards and human activities. This research was conducted in North Kordofan State, which is affected by modifications in conditions and composition of vegetation cover trends in the gum arabic belt as in the rest of the Sahelian Sudan zone. The application of remote sensing, geographical information system and satellites imageries with multi-temporal and spatial analysis of land use land cover provides the land managers w

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24

Glover, David A. "The effects of dietary supplementation with Gum arabic on blood pressure and renal function in subjects with Type 2 diabetes mellitus." Thesis, Cardiff University, 2012. http://orca.cf.ac.uk/39863/.

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Type 2 diabetes mellitus is associated with a significant increased morbidity and mortality resulting from microvascular and macrovascular complications, in particular diabetic nephropathy and cardiovascular disease. Treatment of these conditions has involved improving diabetic control, reducing blood pressure and addressing other cardiovascular risk factors. Dietary fibre has wide reaching health benefits, including improvement of diabetic control and blood pressure, potentially by alterations in colonic bacterial populations that result in changes in serum short chain fatty acids. An open la

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25

Mahmoud, Tarig Elsheikh. "The adequacy of price incentives on production, processing and marketing of gum arabic in Sudan: A case study of north and west Kordofan /." Dresden : Inst. für Internat. Forst- und Holzwirtschaft, 2004. http://www.gbv.de/dms/zbw/396996620.pdf.

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26

Bekele, Tsegaye, Eckhard Auch, Wassie Abeje Eshete, et al. "Policy Brief for realizing green/bio economy with high value Non-Timber Forest Products commercialization in Ethiopia and Sudan." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-218721.

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This policy brief deals with the research findings of the collaborative research project “CHAnces IN Sustainability – promoting natural resource based product chains in East Africa” (CHAINS) funded by the Federal Ministry of Education and Research, and the DLR Project Management Agency. It presents the studies investigating the value chains of highland BAMBOO and NATURAL GUM AND RESIN products in Ethiopia as well as GUM ARABIC value chains in Sudan. These products possess high eco¬nomic, social and environ¬mental benefits and untapped potentials. However, their pro-duction and commercializatio

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27

Eshete, Wassie Abeje, Wubalem Tadesse, Teshale Woldeamanuel, et al. "Policy Brief for realizing green/bio economy with high value Non-Timber Forest Products commercialization in Ethiopia and Sudan." Technische Universität Dresden, 2017. https://tud.qucosa.de/id/qucosa%3A30151.

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This policy brief deals with the research findings of the collaborative research project “CHAnces IN Sustainability – promoting natural resource based product chains in East Africa” (CHAINS) funded by the Federal Ministry of Education and Research, and the DLR Project Management Agency. It presents the studies investigating the value chains of highland BAMBOO and NATURAL GUM AND RESIN products in Ethiopia as well as GUM ARABIC value chains in Sudan. These products possess high eco¬nomic, social and environ¬mental benefits and untapped potentials. However, their pro-duction and commercializatio

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Santana, Audirene Amorim. "Obtenção da polpa de pequi e do leite de coco babaçu microencapsulados através da secagem por aspersão." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/256812.

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Orientadores: Kil Jin Park, Louise Emy Kurozawa<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Agrícola<br>Made available in DSpace on 2018-08-21T20:57:22Z (GMT). No. of bitstreams: 1 Santana_AudireneAmorim_D.pdf: 17094211 bytes, checksum: 544e76274df6f1a5e73568cb21d2f073 (MD5) Previous issue date: 2013<br>Resumo: O pequi (Caryocar brasiliense Camb), fruto rico em óleo, proteínas e carotenóides, é cultivado em todo o cerrado brasileiro. Outro produto encontrado nesta região é o babaçu (Orbignya phalerata, Mart.), que é uma das mais importantes representantes

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29

Silva, Mariana Casagrande. "Aproveitamento do resíduo do despolpamento da jabuticaba (Myrciaria cauliflora) para obtenção de pigmento com propriedades funcionais." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/74/74132/tde-14032013-141427/.

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A jabuticaba é uma fruta originalmente brasileira e que começa a ser explorada comercialmente para produção de polpa congelada, geleia, licor, dentre outros produtos. O processamento da jabuticaba gera uma grande quantidade de resíduos, oriundos da casca e da semente, que normalmente são descartados em aterros, contribuindo para poluição ambiental. Todavia, esses resíduos são ótimas fontes de ingredientes funcionais, tais como antocianinas (pigmentos roxos) e elagitaninos, ambos potentes antioxidantes. Assim, o objetivo deste estudo foi extrair o pigmento do resíduo do despolpamento da jabutic

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Yerovi, Diego Santiago Tupuna. "Produção de microcápsulas de norbixina por spray-drying : avaliação da estabilidade e aplicação em bebidas isotônicas como corante natural." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/156787.

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A cor dos alimentos é um dos principais fatores que influenciam na preferência dos consumidores. Os corantes naturais além da coloração podem oferecer benefícios à saúde humana. A norbixina é um carotenoide que pode ser produzido a partir da saponificação de bixina presente nas sementes de urucum. Tal composto apresenta propriedades funcionais que estão relacionadas a promoção de uma vida saudável, pois atua como protetor celular, é comumente usado como corante natural em produtos processados, entretanto, sua estrutura química torna-o susceptível à degradação por fatores ambientais como oxigên

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Stoll, Liana. "Desenvolvimento e aplicação de filmes biodegradáveis com antioxidantes extraídos a partir de bagaço de uva, um resíduo da indústria vitivinícola." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/129770.

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O consumo abusivo de embalagens plásticas tem causado diversos problemas ambientais, visto que as mesmas são produzidas a partir de fontes não renováveis de energia e são resistentes à degradação. Neste contexto, o desenvolvimento de filmes biodegradáveis ativos para aplicação em alimentos é de grande importância pois, além de serem produzidos a partir fontes renováveis e mais sustentáveis, os mesmos podem interagir com o produto embalado e proporcionar benefícios extras em relação aos filmes convencionais. Este trabalho utilizou o bagaço de uva proveniente do processo de vinificação como font

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Auch, Eckhard, and Abtew Asmamaw Alemu. "Participative Innovation Platforms (PIP): Guideline for analysis and development of commercial forest product value chains in Sudan and Ethiopia." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-203964.

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This working paper was developed with the intention to provide a guideline for participatory analysis and development of commercial forest product value chains, in the context of developing countries. Basically, it was designed for identification and implementation of interventions or upgrading measures for the improvement of commercial forest product (Bamboo, Natural gum and resin, and Gum Arabic) value chains in Ethiopia and Sudan within the framework of a collaborative research project - CHAnces IN Sustainability: promoting natural resource based product chains in East Africa (CHAINS). The

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Ahmed, Eisa Maymoona. "An Ecological Study of the Effect of the Long-horned Beetle Species (Coleoptera: Cerambycidae) on the Acacia Species in the Gum Arabic Belt of the Kordofan Region, Sudan." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-79706.

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Acacia species producing gum Arabic are of great (socio)-economic, and ecological importance in Sudan. Insect attacks are one of the main causal agents in the decline in the gum Arabic yielding trees. Infested trees are almost totally damaged if the infestation is left untreated. The beetle family Cerambycidae is one of the largest groups of insects. Commonly referred to as long-horned beetles, these pests destroy host trees, having a great affect during times of drought. Many studies have been completed about the effect of long-horned beetles in various global settings. Ho

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Porto, Bruna Castro 1987. "Efeito da alta pressão dinâmica nas propriedades tecnológicas da goma do cajueiro (Anacardium occidentale L.)." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/254843.

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Orientador: Marcelo Cristianini<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia de Alimentos<br>Made available in DSpace on 2018-08-22T00:17:22Z (GMT). No. of bitstreams: 1 Porto_BrunaCastro_M.pdf: 1622072 bytes, checksum: 6514e53552e6ebb0dd11ed91b7443580 (MD5) Previous issue date: 2013<br>Resumo: A goma do cajueiro (GC) é um produto isolado do exsudado bruto do cajueiro e tem sido mencionada como uma possível alternativa a substituir a goma arábica na indústria de alimentos. A alta pressão dinâmica (APD) é apresentada como uma opção a modificação físic

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Maggioli, Mirtza Fúlvia. "Retenção de óleo de café verde em complexos coacervados de proteínas concentradas do soro de leite ou soja e goma arábica." Universidade Federal de Goiás, 2014. http://repositorio.bc.ufg.br/tede/handle/tede/6546.

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Submitted by JÚLIO HEBER SILVA (julioheber@yahoo.com.br) on 2016-11-23T16:13:22Z No. of bitstreams: 2 Dissertação - Mirtza Fúlvia Maggioli - 2014.pdf: 10959485 bytes, checksum: 5397bb78460f4fbc15b15f9f9dd335a5 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)<br>Approved for entry into archive by Jaqueline Silva (jtas29@gmail.com) on 2016-11-30T15:44:44Z (GMT) No. of bitstreams: 2 Dissertação - Mirtza Fúlvia Maggioli - 2014.pdf: 10959485 bytes, checksum: 5397bb78460f4fbc15b15f9f9dd335a5 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)<br>M

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Adam, Hassan Elnour [Verfasser], Elmar [Akademischer Betreuer] Csaplovics, and Michael [Akademischer Betreuer] Köhl. "Integration of remote sensing and GIS in studying vegetation trends and conditions in the gum arabic belt in North Kordofan, Sudan / Hassan Elnour Adam. Gutachter: Elmar Csaplovics ; Michael Köhl. Betreuer: Elmar Csaplovics." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2011. http://d-nb.info/1067188487/34.

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Chung, Monique Mi Song. "Polpa de guavira (Campomanesia cambessedeana Berg) desidratada em spray dryer: efeitos das condições de processo e composição da alimentação nas propriedades físico químicas e atividade antioxidante." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/74/74133/tde-11042016-141350/.

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O objetivo desse trabalho foi obter polpa de guavira desidratada por atomização, utilizando maltodextrina ou goma arábica como agentes carreadores. Inicialmente, avaliou-se a influência das condições de processo, temperatura do ar de secagem (130, 155 e 180) °C e vazão volumétrica da mistura (20 e 40) mL/min, o tipo e concentração de agente carreador (10 e 20) % nas características físicas, físico-químicas e atividade antioxidante do produto obtido. As propriedades analisadas foram umidade, atividade de água, higroscopicidade, solubilidade, cor, distribuição e tamanho médio de partículas, morf

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Ahmed, Eisa Maymoona Verfasser], Mechthild [Akademischer Betreuer] [Roth, and Yasir [Akademischer Betreuer] Bashir. "An Ecological Study of the Effect of the Long-horned Beetle Species (Coleoptera: Cerambycidae) on the Acacia Species in the Gum Arabic Belt of the Kordofan Region, Sudan / Maymoona Ahmed Eisa. Gutachter: Yasir Bashir. Betreuer: Mechthild Roth." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2011. http://d-nb.info/1067729666/34.

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Palou, Madi Oumarou. "Déterminants socio-économiques de la gestion paysanne des plantations d'Acacia sénégal et de la production de la gomme arabique au Nord-Cameroun." Thesis, Toulouse 2, 2011. http://www.theses.fr/2011TOU20145.

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E Nord-Cameroun comme toutes les zones arides et semi-arides de l’Afrique subsaharienne est confronté à la désertification qui est causée par les aléas climatiques et la surexploitation des ressources naturelles. L’une des conséquences est la baisse des rendements des cultures due à la dégradation des sols cultivables. Dans cette situation, l’une des voies pour améliorer le niveau de vie paysan est de développer la plantation des ligneux à usages multiples. L’introduction de l’A. senegal dans les années 90 dans les exploitations agricoles avait l’optique de restaurer la fertilité des sols et d

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Oliveira, Jhones Luiz de. "Desenvolvimento de sistemas de liberação modificada a base de zeína e quitosana para repelentes botânicos visando o controle de mosca-branca (Bemisia tabaci) em diferentes culturas." Universidade Estadual Paulista (UNESP), 2018. http://hdl.handle.net/11449/157116.

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Submitted by JHONES LUIZ DE OLIVEIRA (jholuisoliveira@hotmail.com) on 2018-09-21T20:36:12Z No. of bitstreams: 1 Tese_Jhones_Versão_final.docx: 18568915 bytes, checksum: 5f380ac64e8ceaf78f5ca0aadd101a25 (MD5)<br>Rejected by Lucimara Kurokawa Shinoda null (lucimaraks@sorocaba.unesp.br), reason: Solicitamos que realize correções na submissão seguindo as orientações abaixo: - O arquivo deve estar no formato Portable Document Format (PDF) e não deve estar protegido; - Deve constar o Certificado de Aprovação no lugar da Ata. Agradecemos a compreensão. on 2018-09-24T17:57:56Z (GMT)<br>Submit

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Jouanny-Bouyer, Eléonore. "Stabilisation d’émulsions d’intérêt pharmaceutique par des protéines et des polysaccharides : exemples de la β-lactoglobuline, de la gomme arabique et de la gomme xanthane". Thesis, Paris 11, 2011. http://www.theses.fr/2011PA114802/document.

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L’objectif de cette étude a été de formuler et caractériser des émulsions simples huile/eau d’intérêt pharmaceutique stabilisées par de la β-lactoglobuline (β-lg), de la gomme arabique (GA), de la gomme xanthane (GX) et des mélanges β-lg:GA et β-lg:GX. Les concentrations massiques totales des dispersions de biopolymères étaient de 1 % et ont été augmentées à 2,5 % si les émulsions formulées n’étaient pas stables. Le mélange β-lg:GA a été réalisé à pH 4,2 afin de permettre la formation de complexes par interactions électrostatiques attractives entre la β-lg et la GA. Deux ratios β-lg:GA ont été

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Nguyen, Duc Quang. "Étude comparative expérimentale des opérations d’atomisation et d’autovaporisation : application à la gomme arabique et au soja." Thesis, La Rochelle, 2014. http://www.theses.fr/2014LAROS010/document.

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De nos jours, la nécessité d’atteindre la stabilité à long terme et la facilité d'utilisation, en plus d’une plus grande fonctionnalité, implique que de nombreux produits alimentaires et ingrédients liquides ou solides sont déshydratés ou transformés mécaniquement en poudre. Les procédés de fabrication des poudres alimentaires exigent toujours la satisfaction d’une série de critères tels que la performance du procédé et la qualité du produit. La technologie d’atomisation est toujours considérée comme la principale technologie de production des poudres dans plusieurs domaines variés grâce à ses

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Abakar, Ali. "Caractéristiques mécaniques et thermiques de l’argile stabilisée par la gomme arabique et renforcée par la paille de riz." Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0066.

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Le réchauffement climatique et le coût élevé des matériaux de construction conventionnels (ciment, chaux, acier) nous obligent à recourir aux matériaux locaux, disponibles et sans effet négatif sur l’atmosphère. Il s’agit de blocs de terre comprimée (BTC) stabilisés par de la gomme arabique et renforcés avec de la paille de riz. L’objectif principal de ce travail est la valorisation des matériaux locaux et écologiques pour la construction des habitations durables. L’étude concerne la caractérisation mécanique, thermique et la durabilité des éprouvettes fabriquées avec de l’argile, du sable, de

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Furlanetto, Marcos. "Coacervação complexa de compostos nitro-heterocíclicos. Obtenção de microcápsulas e avaliação da atividade antichagásica." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/9/9135/tde-22012018-123339/.

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A Doença de Chagas atualmente atinge a vida de aproximadamente 18 milhões de portadores do parasita. Assim, este trabalho, parte de um estudo mais amplo, teve como objetivo avaliar a atividade biológica de compostos nitro-heterocíclicos com estrutura análoga à nifuroxazida, 5-nitro-2-furfurilideno 4-hidroxibenzidrazida, frente à cepa Y de Trypanosoma cruzi antes e após a sua microencapsulação por coacervação complexa de gelatina e goma-arábica, que, em geral, se mostram pouco solúveis nos meios e concentração empregados em testes farmacológicos, indicando a necessidade do desenvolvimento de um

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Pedro, Maria Angélica Marques. "Influência de encapsulantes e do método de secagem nas propriedades físico-químicas e atributos de qualidade de polpa de maracujá (Passifora edulis f. flavicarpa) /." São José do Rio Preto : [s.n.], 2009. http://hdl.handle.net/11449/101967.

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Orientador: Vânia Regina Nicoletti Telis<br>Banca: Caciano Pelayo Zapata Noreña<br>Banca: Joel Fernando Nicoleti<br>Banca: José Francisco Lopes Filho<br>Banca: José Antônio Gomes Vieira<br>Resumo: Os objetivos deste trabalho foram analisar a influência do tipo e da quantidade de aditivos, além de diferentes métodos de secagem da polpa de maracujá em pó, nas isotermas, propriedades termodinâmicas de sorção e nos atributos de qualidade do produto obtido. No capítulo 1 descreve-se o efeito de diferentes aditivos - maltodextrina DE 10 e goma arábica - sobre as isotermas de sorção nas temperaturas

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Adam, Aurélie. "Auto-assemblage de la gomme d'acacia modifiée par voie enzymatique." Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0306.

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L’apparition de l’ordre à partir du désordre nous a toujours fasciné et notamment les auto-assemblages. En effet, ils permettent de former spontanément des particules en suspension (particules colloïdales) sans apport d’énergie. La plupart des études cherchant à induire un auto-assemblage se basent sur des techniques chimiques, faisant souvent appel à des solvants organiques ou des composés toxiques. L'originalité du Laboratoire d'Ingénierie des Biomolécules (LIBio) repose sur la formulation de vecteurs innovants dont les constituants sont issus d'agro-ressources renouvelables. Un des axes de

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Righetto, Andrea Mara. "Caracterização fisico-quimica e estabilidade de suco de acerola verde microencapsulado por atomização e liofilização." [s.n.], 2003. http://repositorio.unicamp.br/jspui/handle/REPOSIP/256403.

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Orientador: Flavia Maria Netto<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia de Alimentos<br>Made available in DSpace on 2018-08-03T15:38:40Z (GMT). No. of bitstreams: 1 Righetto_AndreaMara_D.pdf: 10238421 bytes, checksum: 93662e77f53fe2e459fa3a0a3895a2b7 (MD5) Previous issue date: 2003<br>Resumo: A acerola é uma fruta tropical, cujo principal atrativo é o alto teor de vitamina C que apresenta. O teor de vitamina C da fluta decresce com a maturação, mas não há estudos na literatura que explorem o potencial da acerola verde como matéria prima de produtos com

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Servant, Sylvie. "Variabilité des propriétés physico-chimiques d'exsudats d'Acacia senegal (gomme arabique) d'une plantation expérimentale au Ferlo (Sénégal). Modification des chaînes." Rouen, 1994. http://www.theses.fr/1994ROUES045.

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La gomme arabique exsudée par Acacia senegal est un polymère naturel hétéropolymoléculaire parfaitement hydrophile. L'étude physico-chimique d'exsudats d'Acacia senegal, bien identifiés botaniquement, issus de populations artificielles du Nord Ferlo (Sénégal) permet d'établir la variabilité des valeurs de viscosité, de pouvoir rotatoire et de teneur en azote. Nous avons cherché des corrélations des différents paramètres entre eux et des paramètres physico-chimiques avec les conditions climatiques et édaphotopographiques de la gommeraie. Afin d'améliorer les propriétés émulsifiantes de la gomme

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Pedro, Maria Angélica Marques [UNESP]. "Influência de encapsulantes e do método de secagem nas propriedades físico-químicas e atributos de qualidade de polpa de maracujá (Passifora edulis f. flavicarpa)." Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/101967.

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Made available in DSpace on 2014-06-11T19:31:39Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-08-28Bitstream added on 2014-06-13T18:42:35Z : No. of bitstreams: 1 pedro_mam_dr_sjrp.pdf: 1284122 bytes, checksum: 45709686cf62bab3c06f4aeffcf8c502 (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Os objetivos deste trabalho foram analisar a influência do tipo e da quantidade de aditivos, além de diferentes métodos de secagem da polpa de maracujá em pó, nas isotermas, propriedades termodinâmicas de sorção e nos atributos de qualidade do produto obtido. No cap

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Vuillemin, Marie. "Auto-assemblage de polysaccharides fonctionnalisés : une étude thermodynamique." Electronic Thesis or Diss., Université de Lorraine, 2019. http://www.theses.fr/2019LORR0177.

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Les polymères en solution peuvent s’auto-assembler pour former différents types de complexes (coacervats, agrégats, etc.). Ces objets, en plus de régir l’organisation cellulaire peuvent être détournés pour encapsuler des molécules d’intérêt. Cependant, avant de pouvoir les utiliser en tant que tel, la compréhension des mécanismes d’auto-assemblage est indispensable pour pouvoir les contrôler et ainsi former des objets à façon. Ce travail de thèse porte sur l’auto-assemblage entre la gomme d’Acacia et le chitosane. Les interactions mises en jeu lors de la séparation de phases associatives repos

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