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Rozprawy doktorskie na temat „Lactose hydrolysis”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 20 lutego 2023

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1

Matak, Kristen Erica. "Lactose Hydrolysis by Fungal and Yeast Lactase: Influence on Freezing Point and Dipping Characteristics of Ice Cream." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/30998.

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Two studies were conducted to examine the effects of lactose hydrolysis on freezing point and dipping characteristics of ice cream. The overall research objective was to determine changes in freezing point, texture and ease of dipping ice cream as a result of lactose hydrolysis. It was also the goal of this research to relate observations from the sensory dippability study with hardness and yield stress data to determine if the latter methods could be used as an alternative to human testing of dippability. In the first experiment, ice cream mixes were treated with lactase (EC 3.2.1.23)

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2

Kreft, Mary Ellen. "Lactose hydrolysis by sonicated cultures of Lactobacillus delbrueckii subsp. bulgaricus 11842." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ60448.pdf.

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Chaudhary, Manoja Nand, of Western Sydney Hawkesbury University, of Science Technology and Agriculture Faculty, and School of Food Science and Technology. "An evaluation of nanofiltration and lactose hydrolysis of milk UF permeate for use in ice cream." THESIS_FSTA_FST_Chaudhary_M.xml, 1997. http://handle.uws.edu.au:8081/1959.7/741.

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This study aimed to obtain 15% total solids and reduced mineral content in milk UF permeate by nanofiltration, hydrolysing the lactose content of nano-concentrate enzymically, partially substituting sucrose in ice cream formulations with hydrolysed lactose nano-concentrate (HLNC), and investigating the effects of HLNC on the physio-chemical and sensory characteristics of ice cream. The desired 15% total solids in the nano-concentrate was achieved after three fold concentration of milk UF permeate. The colour of milk permeate changed, pH and mineral content decreased, and crude protein content,

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4

Bury, Dean. "Growth and disruption of Lactobacillus delbrueckii spp. bulgaricus for lactose hydrolysis applications." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0009/MQ60097.pdf.

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5

Ribeiro, Cátia Vanessa Carvalho. "Ensaios de fabrico de queijo fresco com teor reduzido de lactose." Master's thesis, ISA, 2013. http://hdl.handle.net/10400.5/6463.

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Mestrado em Engenharia Alimentar - Instituto Superior de Agronomia<br>It can be stated that one third of Portugal’s population suffer of lactose intolerance. The main objective of this study was the development of a new product in our market, originated in Portugal, low lactose fresh cheese. Were tested various enzymatic hydrolysis methodologies, in order to know what is the enzyme’s actuation time on milk or cheese required to hydrolyze the biggest lactose content. The enzyme was added 3 and 18 hours at 6C and 1 hour at 30C, before the beginning of manufacture, and, added at the time of ad

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6

Trevisan, Ana Paula. "INFLUÊNCIA DE DIFERENTES CONCENTRAÇÕES DE ENZIMAS LACTASE E TEMPERATURAS SOBRE A HIDRÓLISE DA LACTOSE EM LEITE PASTEURIZADO." Universidade Federal de Santa Maria, 2008. http://repositorio.ufsm.br/handle/1/5654.

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The intolerance to lactose is the most common intolerance to carbohydrates among people of all ages and it affects about 70% of the adult population worldwide. Due to the prevalence of this condition on the world population, the commercial interest on milk and derivatives with reduced amount of lactose has increased. Such product can be obtained through lactose hydrolysis, mainly through the enzymatic method, using lactase enzyme. The level of lactose hydrolysis depends on the dosage of J-galactosidase in milk, as well as on its processing conditions and, for this reason, it is extremely impor

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7

Freitas, Maria de FÃtima Matos de. "ProduÃÃo de β-galactosidase por Kluyveromyces lactis NRRL Y1564 em soro de leite e imobilizaÃÃo em quitosana." Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=9396.

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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior<br>Neste trabalho, a enzima β-galactosidase, que catalisa a hidrÃlise da lactose em glicose e galactose, foi produzida pelo cultivo do micro-organismo Kluyveromyces lactis NRRL Y1564 em soro de leite suplementado com extrato de levedura. A enzima Ã um metabÃlito intracelular, sendo a liberaÃÃo da enzima para o meio uma condiÃÃo essencial, por isso estudaram-se diferentes mÃtodos quÃmicos e mecÃnicos de extraÃÃo como, agitaÃÃo com pÃrolas de vidro, ruptura em ultrassom com pÃrolas de vidro, adiÃÃo de etanol e tolueno, observando t

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8

Davidson, Richard H. "Culture enumeration, lactose hydrolysis and sensory changes in stored frozen yogurt fermented with two culture systems." Thesis, Virginia Tech, 1995. http://hdl.handle.net/10919/45071.

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9

Mioro, Miriam Kanyua. "Designing a Two Component System for Enzyme Immobilization Using a Modified Chitosan Support." Youngstown State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ysu15946615388307.

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10

West, Christopher Michael. "Bioreaction and separation in preparative batch chromatographic columns : the hydrolysis of lactose to yield glucose, galactose and oligosaccharides." Thesis, Aston University, 1997. http://publications.aston.ac.uk/9614/.

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The initial aim of this project was to improve the performance of a chromatographic bioreactor-separator (CBRS). In such a system, a dilute enzyme solution is pumped continuously through a preparative chromatographic column, while pulses of substrate are periodically injected on to the column. Enzymic reaction and separation are therefore performed in a single unit operation. The chromatographic columns used were jacketed glass columns ranging from 1 to 2 metres long with an internal diameter of 1.5 cm. Linking these columns allowed 1, 2, 3 and 4 metre long CBRS systems to be constructed. The

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11

Huet, Laurent. "Réactions radicalaires multicomposant appliquées à la synthèse de lactones et pipéridinones fonctionnalisées." Thesis, Bordeaux 1, 2011. http://www.theses.fr/2011BOR14262/document.

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L'élaboration de squelettes de pipéridinones et lactones a été accomplie de manière très efficace en alliant processus radicalaires et ioniques. La synthèse d'oximes SEM-protégées par un assemblage multicomposant radicalaire permet, après hydrolyse de la fonction oxime, d'obtenir rapidement un aldéhyde fonctionnalisé. Ce composé est ensuite transformé en lactone ou pipéridinone désirée par un processus ionique.Une approche minimisant le nombre d'étapes élémentaires a été développée autorisant ainsi un accès rapide et convenable à une grande diversité de structures. Ces processus peuvent impliq

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12

Campello, Graciella da Silva. "Imobilização de B-galactosidade (LACTOZYM®) em EUPERGIT® C e sua caracterização." reponame:Repositório Institucional da FURG, 2010. http://repositorio.furg.br/handle/1/2584.

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Dissertação(mestrado) - Universidade Federal do Rio Grande, Programa de Pós-Graduação em Engenharia e Ciência de Alimentos, Escola de Química e Alimentos, 2010.<br>Submitted by Caroline Silva (krol_bilhar@hotmail.com) on 2012-08-19T20:33:18Z No. of bitstreams: 1 dissertao graciella campello.pdf: 486302 bytes, checksum: 0f3c85b47643a8359572feee54269a00 (MD5)<br>Approved for entry into archive by Bruna Vieira(bruninha_vieira@ibest.com.br) on 2012-09-24T23:15:13Z (GMT) No. of bitstreams: 1 dissertao graciella campello.pdf: 486302 bytes, checksum: 0f3c85b47643a8359572feee54269a00 (MD5)<br>Made ava

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13

Vieira, Aline Alves Melo Tostes. "Estudo da hidrólise enzimática do soro de queijo utilizando as lactases Lactozym® e Prozyn®." Universidade Federal de Uberlândia, 2006. https://repositorio.ufu.br/handle/123456789/15120.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>The study of the enzymatic hydrolysis of the lactose has been of great importance, due to absence or lack of the enzyme present lactase in the process digestive human. The enzyme β-galactosidase is very used in the processing of milk products by being of low cost and enough studied all over the world. The use of this enzyme in the dairy products prevents the crystallization of the products and it provides to the intolerant people the lactose better life quality. The objective of this work was accomplish a comparative study of the

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14

Stievenard, Sylvain. "Hydrolyse industrielle du lactose : mise au point au stade laboratoire d'un réacteur à lactase immobilisée." Lille 1, 1986. http://www.theses.fr/1986LIL10172.

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L'existence d'une activité lactasique chez un micro-organisme non pathogène nous a conduit à envisager la mise au point d'un procédé d'hydrolyse industrielle du lactose contenu dans le lait et les lactosérums. Notre démarche s'est appuyée sur plusieurs points : le procédé doit être facile à mettre en oeuvre industirellement et doit pouvoir se réaliser en continu. Il doit être en outre peu coûteux et conforme à la législation. La purification de la lactase est procédé qui s'est révélé être trop onéreux et déstabilisateur de l'activité enzymatique. Les cellules de ce microorganisme ont été inclu

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15

Pickens, Tara L. L. "Immobilization of Beta-Glycosidase BglX from Escherichia coli on Chitosan Gel Beads." Youngstown State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1535472543349818.

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16

Gregianin, Dóris de Oliveira. "DESENVOLVIMENTO DE BEBIDA MISTA DE SORO DE LEITE COM TEOR DE LACTOSE REDUZIDO E EXTRATO HIDROSSOLÚVEL DE SOJA." UNIVERSIDADE ESTADUAL DE PONTA GROSSA, 2014. http://tede2.uepg.br/jspui/handle/prefix/714.

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Made available in DSpace on 2017-07-21T18:53:23Z (GMT). No. of bitstreams: 1 Doris Oliveira Gregianin.pdf: 1718205 bytes, checksum: 59a8cb966255e87e0fa3f347f2a191cb (MD5) Previous issue date: 2014-08-28<br>The increased incidence of cardiovascular disease and various cancers have been the cause of searching for changing habits in a large portion of the population, seeking the physical activity in conjunction with the consumption of healthier foods with higher nutritional content. Considering the high biological value of the proteins of sweet whey and the recognized effect in reducing risk of

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17

Chaudhary, Manoja Nand. "An evaluation of nanofiltration and lactose hydrolysis of milk UF permeate for use in ice cream : thesis submitted in fulfilment of the requrement for the degree of Master of Science (Hons.) in Food Technology /." Richmond, N.S.W. : Faculty of Science, Technology and Agriculture, University of Western Sydney, 1997. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20030528.125302/index.html.

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18

Hediger, Thomas. "Die enzymatische Hydrolyse der Lactose mit Hohlfaserreaktoren /." [S.l.] : [s.n.], 1985. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=7933.

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19

Dragana, Ilić-Udovičić. "Optimizacija tehnološkog procesa proizvodnje napitaka od enzimski hidrolizovanog permeata mleka." Phd thesis, Univerzitet u Novom Sadu, Tehnološki fakultet Novi Sad, 2015. http://www.cris.uns.ac.rs/record.jsf?recordId=95728&source=NDLTD&language=en.

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Valorizacija permeata kao sporednog proizvoda industrije mleka je od izuzetnog ekolo&scaron;kog, ekonomskog i tehnolo&scaron;kog značaja.Cilj doktorske disertacije je razvoj tehnolo&scaron;kog procesa prerade permeata, kao sporednog proizvoda dobijenog nakon ultrafiltracije mleka tokom proizvodnje feta sira i svežeg (&bdquo;mladog“) sira. Ispitana je mogućnost enzimske hidrolize laktoze u permeatu kori&scaron;ćenjem enzima β-galaktozidaze izolovanog iz Kluyveromyces lactis u koncentraciji 0,1, 0,3 i 0,5 g/100g na temperaturama 20º, 30º i 40 ºC. Praćene su promene sadr

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20

Simonpieri, Véronique. "Mise au point d'un procédé d'hydrolyse du lactose du lait UHT demi-écrémé à l'aide d'une culture mixte de levures." Dijon, 1987. http://www.theses.fr/1987DIJOS044.

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L'hydrolyse du lactose est réalisée durant 24 heures a 30°C par la levure kluyveromyces lactis. Une concentration cellulaire initiale dense provenant d'une préculture sur substrat lacté, et une culture en conditions aérées et agitées favorisent le processus d'hydrolyse. L'action de kluyveromyces lactis sur certains éléments du lait (matière grasse, fraction protéique, calcium et phosphore) a été précisée. La nature de l'acidité qui apparait corrélativement au développement de la levure a été caractérisée. Une désacidification est possible en introduisant la levure. Candida utilis D 5754 en fin

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21

Fouque, Elie. "Synthèse itérative de lactones α, β-ethyléniques à cycle moyen : hydrolyse enzymatique de lactones saturées". Paris 11, 1989. http://www.theses.fr/1989PA112246.

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Dans ce mémoire de thèse, nous proposons une nouvelle voie d'accès aux lactones alpha, bêta-éthyléniques à cycle moyen par une méthode d'agrandissement de cycle, qui, utilisée de façon récurrente permet à chaque itération d'incorporer dans le squelette laconique un atome de carbone porteur ou non d'un substituant. Dans le premier chapitre, après un exposé concernant la préparation des éthers d'énols triméthylsilyliques de lactones, nous étudions la réaction de ces énoxysilanes avec trois chlorocarbénoïdes différents. Les adduits cyclopropaniques ainsi obtenus, conduisent thermiquement aux lact

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22

Belbella, Abdelàaziz. "Contribution à l'étude de la dégradation de vecteurs collodaux polymères constituéd de poly(DL-lactide) et de poly(DL-lactide-CO-glycolide." Paris 11, 1995. http://www.theses.fr/1995PA114815.

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23

Zuñiga, de Lopez Raquel. "Étude structurale et texturale de laits acidifiés par hydrolyse de Glucono-Delta-Lactone et contenant des polysaccharides." Vandoeuvre-les-Nancy, INPL, 1999. http://www.theses.fr/1999INPL071N.

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Le développement des laits fermentes acides avec de nouvelles textures peut être réalisé en exploitant les interactions entre les protéines du lait et les polysaccharides. L’incorporation de ces macromolécules dans le lait peut provoquer une perturbation du système qui est amplifiée lors d'une fermentation. La structure qui en résulte peut avoir une forte incidence sur les propriétés mécaniques et texturales du produit. Afin d'étudier ces différents points, nous avons entrepris ce travail dont l'objectif était de relier la (micro)structure (met, meb, microscospie optique a contraste de phases)

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24

Desobry-Banon, Sylvie. "Modification de la structure des micelles de caséine lors de l'acidification par hydrolyse de Glucono-Delta-Lactone." Vandoeuvre-les-Nancy, INPL, 1991. http://docnum.univ-lorraine.fr/public/INPL_T_1991_DESOBRY_BANON_S.pdf.

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La synthèse bibliographique, constituant la première partie de ce travail, se divise selon trois thèmes : la structure, les propriétés colloïdales et le comportement en milieu acide des micelles de caséine du lait. L'acidification par hydrolyse de Glucono-Delta-Lactone conduit à la gélification du lait. Le suivi optique de ce processus (chapitre II) dans diverses conditions de température et de concentrations en GDL aboutit à la validation d'une méthode turbidimétrie basée sur la réflexion de la lumière. Le comportement des micelles de caséine durant l'acidification est étudié (chapitre III) g

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25

Lopes, Fialho Tatiana. "Lactose hydrolyzed milk powder : optimization of the drying process and study of structural and functional properties." Thesis, Lille 1, 2019. http://www.theses.fr/2019LIL1R013/document.

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La technologie de production du lait en poudre hydrolysé au lactose a été développée pour répondre aux besoins des consommateurs intolérants au lactose. Bien que le produit soit actuellement commercialisé dans certains pays, le secteur est confronté à des problèmes technologiques lors de la production et du stockage de la poudre, tels que l'agglomération, la prise en masse, le brunissement, une hygroscopicité élevée, un faible rendement de production et une perte de propriétés technofonctionnelles. Dans ce contexte, deux objectifs principaux ont été assignés aux travaux de cette thèse: (i) opt

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26

Edreder, Elmahboub A. "Modelling and optimisation of batch distillation involving esterification and hydrolysis reaction systems : modelling and optimisation of conventional and unconventional batch distillation process : application to esterification of methanol and ethanol using acetic acid and hydrolysis of methyl lactate system." Thesis, University of Bradford, 2010. http://hdl.handle.net/10454/4296.

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Batch distillation with chemical reaction when takes place in the same unit is referred to as batch reactive distillation process. The combination reduces the capital and operating costs considerably. Among many different types of batch reactive distillation column configurations, (a) conventional (b) inverted (c) semi-batch columns are considered here. Three reaction schemes such as (a) esterification of methanol (b) esterification of ethanol (c) hydrolysis of methyl lactate are studied here. Four different types of dynamic optimisation problems such as (a) maximum conversion (b) maximum prod

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27

Edreder, E. A. "Modelling and optimisation of batch distillation involving esterification and hydrolysis reaction systems. Modelling and optimisation of conventional and unconventional batch distillation process: Application to esterification of methanol and ethanol using acetic acid and hydrolysis of methyl lactate system." Thesis, University of Bradford, 2010. http://hdl.handle.net/10454/4296.

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Batch distillation with chemical reaction when takes place in the same unit is referred to as batch reactive distillation process. The combination reduces the capital and operating costs considerably. Among many different types of batch reactive distillation column configurations, (a) conventional (b) inverted (c) semi-batch columns are considered here. Three reaction schemes such as (a) esterification of methanol (b) esterification of ethanol (c) hydrolysis of methyl lactate are studied here. Four different types of dynamic optimisation problems such as (a) maximum conversion (b) maxim

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28

David, Hamon Catherine. "Synthese asymetrique de lactones : application a la serie des acides meviniques, inhibiteurs de la biosynthese du cholesterol." Poitiers, 1988. http://www.theses.fr/1988POIT2203.

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La compactine et la mevinoline sont des inhibiteurs de l'hmg-coa reductase, enzyme qui transforme l'hmg-coa en acide mevalonique dans une des premieres etapes de la biosynthese du cholesterol. Ces inhibiteurs sont caracterises par un squelette decalinique lie a un systeme lactonique dont la presence est indispensable a l'activite biologique. La preparation d'analogues necessite de disposer d'un synthon chiral qui peut etre obtenu a partir d'un sucre de la serie d. Plusieurs methodes de desoxygenation en positions 2 et 4 a partir de sucres divers (glucose, mannose, galactose) ont ete etudiees.

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29

Leke, Lokombé. "Valorisation d'un hydrolysat de protéine obtenu à partir de l'hémoglobine bovine : Etudes expérimentales, immunochimiques et essais cliniques." Compiègne, 1994. http://www.theses.fr/1994COMP775S.

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L'objectif de ce travail est d'évaluer la valeur biologique et l'efficacité nutritionnelle de l'hydrolysat pepsique d'hémoglobine bovine produit à l'échelle pilote. Les études biochimiques révèlent un déficit en isoleucine et cystéine nécessitant un enrichissement préalable avant tout usage à visé&e nutritionnelle, un rapport en acide aminés essentiels à 49,7 %) et un taux d'acides aminés libres inférieur à 1%. La spectrométrie de masse situe le poids moléculaire des peptides entre 600 et 1650 daltons. La détermination de l'immunogénicité et de l'antigénicité de l'hémoglobine bovine native

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30

Miao, Lei. "Synthesis of Amphibian Alkaloids and Development of Acetaminophen Analogues." ScholarWorks@UNO, 2009. http://scholarworks.uno.edu/td/985.

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The focus of these studies has been toward the development of new synthetic methods and procedures for the synthesis of novel compounds with unique biological properties. This research has led to the development of two new synthetic strategies for the construction of two novel amphibian alkaloids. In addition, the efforts have led to the large-scale process for the preparation of a novel analgesic compound. The regioselective ring opening of lactones (δ-valerolactone and γ-butyrolactone) with aryllithium reagents is reported for the construction of a series of δ-hydroxyarylketones and γ-hydrox

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31

Peterson, Ralph Scott. "Lactose hydrolysis by immobilized beta-galactosidase in a capillary bed reactor." 1987. http://catalog.hathitrust.org/api/volumes/oclc/16704043.html.

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Thesis (Ph. D.)--University of Wisconsin--Madison, 1987.<br>Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 235-245).

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32

Bakken, Andrew Peter. "Novel immobilized [beta]-galactosidase reactors for hydrolysis of lactose in skim milk." 1990. http://catalog.hathitrust.org/api/volumes/oclc/23174620.html.

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Thesis (Ph. D.)--University of Wisconsin--Madison, 1990.<br>Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 275-287).

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Scott, Timothy Charles. "Hydrolysis of lactose in permeate from the ultrafiltration of cottage cheese whey using immobilized beta-galsctosidase." 1985. http://catalog.hathitrust.org/api/volumes/oclc/12136891.html.

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Thesis (Ph. D.)--University of Wisconsin--Madison, 1985.<br>Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 366-372).

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Chaudhary, Manoja N. "An evaluation of nanofiltration and lactose hydrolysis of milk UF permeate for use in ice cream." Thesis, 1997. http://handle.uws.edu.au:8081/1959.7/741.

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This study aimed to obtain 15% total solids and reduced mineral content in milk UF permeate by nanofiltration, hydrolysing the lactose content of nano-concentrate enzymically, partially substituting sucrose in ice cream formulations with hydrolysed lactose nano-concentrate (HLNC), and investigating the effects of HLNC on the physio-chemical and sensory characteristics of ice cream. The desired 15% total solids in the nano-concentrate was achieved after three fold concentration of milk UF permeate. The colour of milk permeate changed, pH and mineral content decreased, and crude protein content,

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35

Zamecnik, John Roby. "Investigation of the kinetics of the reaction network involving the hydrolysis of lactose and oxidation of the hydrolysis products in nitric acid solution." 1987. http://catalog.hathitrust.org/api/volumes/oclc/16793842.html.

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Chen, Jun Qi, and 陳駿奇. "Synthesis, characterization and hydrolysis of poly(L-lactide) copolymers." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/64560360887789864268.

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Chen, Jiuun-Chi, and 陳駿奇. "Synthesis,Characterization and Hydrolysis of Poly(L-lactide) Copolymers." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/08915252329667828727.

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碩士<br>國立臺灣科技大學<br>纖維工程技術系<br>82<br>Two new types of boidegradable polymer materials, copoly(L- lactic acid/succinic anhydride/ethylene gl- ycol) and copoly(L- lactic acid/succinic anhydride/po- lyethylene glycol),was synthesized by means of direct copolycondensation of EG or PEG( molar mass=200) with diacid, synthesized from L-lactic acid and succinic anhydride,in the presence of a Ti(OBu) or SnOc cata- lyst. The copolymers were characterized by GPC , IR , H- NMR and contact angle.The fi

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Picardo, Clive Michael. "The hydrolysis of 5-HETE lactone by paraoxonase 1 and its stability in serum." 2007. http://link.library.utoronto.ca/eir/EIRdetail.cfm?Resources__ID=789022&T=F.

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劉興鑑. "The hydrolysis kinetics and crystalline properties in polyethylene glycol/poly(L-lactide)block copolymers." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/46719635574241960016.

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邱齡誼. "The effect of substituents on the acidic hydrolysis of 4 substituted-��,��,�奠�,�奠�-tetrabromo-0-xylene to form lactone". Thesis, 1989. http://ndltd.ncl.edu.tw/handle/87895012249776961562.

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Edreder, E. A., M. Emtir, and Iqbal M. Mujtaba. "Energy saving in conventional and uncoventional batch reactive distillation: application to hydrolysis of methyl lactate system." 2014. http://hdl.handle.net/10454/10623.

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No<br>In this work, energy consumption in a middle vessel batch reactive distillation (MVBRD) column is considered for the production of lactic acid via hydrolysis of methyl lactate. A dynamic optimization problem incorporating a process model is formulated to minimize the batch time which consequently minimizes the total energy consumption. The problem is subject to constraints on the amount and purity of lactic acid. The optimisation variables are reflux ratio and/or reboil ratio which are treated as piecewise constant. The earlier work of the authors on energy consumption in conventional ba

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Samarajeewa, Sandani. "Poly(lactide)-containing Multifunctional Nanoparticles: Synthesis, Domain-selective Degradation and Therapeutic Applicability." Thesis, 2013. http://hdl.handle.net/1969.1/149300.

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Construction of nanoassemblies from degradable components is desired for packaging and controlled release of active therapeutics, and eventual biodegradability in vivo. In this study, shell crosslinked micelles composed of biodegradable poly(lactide) (PLA) core were prepared by the self-assembly of an amphiphilic diblock copolymer synthesized by a combination of ring opening polymerization (ROP) and reversible addition-fragmentation chain transfer (RAFT) polymerization. Enzymatic degradation of the PLA cores of the nanoparticles was achieved upon the addition of proteinase K (PK). Kinetic a

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Ramachandran, Karthik. "Bioresorbable Vascular Scaffolds Gain Ductility, Resistance to Hydrolysis, and Radial Strength via a Unique Poly L-lactide Microstructure." Thesis, 2019. https://thesis.library.caltech.edu/11276/3/Movie%20S5-1.mov.

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<p>Advances in tissue engineering over the past few decades are poised to revolutionize drug delivery and biomedical implants. Bioresorbable vascular scaffolds (BVS), which are made from the semicrystalline polymer poly (L-lactide), are an example of polymers saving and improving the quality of human life. BVSs are emerging as a promising alternative to metal stents for the treatment of coronary heart disease (CHD), one of the leading causes of death in the world. In contrast to permanent stents, BVSs are designed to have a limited lifespan in the body; they restore blood flow through the occl

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"Characterization of the mechanism of sweet almond beta-glucosidase and a novel assay of the rate of hydrolysis of glucono-1,5-lactone." Tulane University, 2007.

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Sweet almond beta-glucosidase was used to catalyze the hydrolysis of paranitrophenol-beta-D-glucopyranoside (pNPG) and methyl-beta-D-glucopyranoside (methyl-glc). The second order rate constants (kcat/Km) were determined over the range of pLs (pL = pH or pD) at which the enzyme is active, resulting in bell shaped plots of rate constants versus pL. k cat/Km represents the mechanistic steps up through and including the first irreversible step (leaving group dissociation). The second order limiting rate constants (kcat/Km)lim show a small solvent kinetic isotope effect (SKIE H2O(V/K) lim/D2O(V/K)

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Edreder, E. A., Iqbal M. Mujtaba, and M. Emtir. "Comparison of Conventional and Middle Vessel Batch Reactive Distillation Column: Application to Hydrolysis of Methyl Lactate to Lactic Acid." 2013. http://hdl.handle.net/10454/9643.

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No<br>Comparison of optimal operation between conventional batch reactive distillation column (CBRD) and middle-vessel batch reactive column (MVBRD) for the production of lactic acid via hydrolysis of methyl lactate has not been considered in the past. Therefore, it is the main focus in this work. A dynamic optimization problem incorporating a process model is formulated to minimize the batch time subject to constraints on the amount and purity of lactic acid. Control variables (reflux ratio or/and a reboil ratio) are treated as a piecewise constant. Optimization results indicate that MVBRD is

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