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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
101

Clinical, histopathological, and molecular features of mucosa-associated lymphoid tissue (MALT) lymphoma carrying the t(X;14) (p11;q32)/GPR34-immunoglobulin heavy chain gene

Akasaka, T., Lee, Stephanie, Novak, A.J., Honjo, G., Takeoka, K., Maekawa, F., Fukutsuka, K., Hayashida, M., Ohno, H. 2017 February 1928 (has links)
Yes / Tenri Foundation
102

The Agricultural Growth and Malting Production of Barley Grains in Northeast Tennessee and Southwest Virginia

Patton, Mark Evans, Mr. 01 May 2016 (has links)
The purpose of this study is to explore the history and production processes of beer and examines the components that contribute to its brewing. The narrative will provide a timeline of the processes that are required to create the product of beer beginning with the agricultural products and following the brewing processes that result in beer as the finished product. I will also examine the business of agriculture and grain processing and will provide some historical perspectives of grain, beer, and malting. I will also consider whether the growing, processing, and malting of grains in the East Tennessee and Southwest Virginia Region is feasible as demonstrated through this research and reported findings.
103

Immunoglobulin VH gen analys in human B-cell

Heidari, Ramesh January 2006 (has links)
<p>Malt lymphoma is a malignant disease that can arise in a variety of extra nodal sites. Previous studies indicate that tumour arise from more mature B-cells.</p><p>Our purpose was to examine the presence of clonality and somatic hypermutation of immunoglobulin (IgVн) of MALT lymphomas.</p><p>Paraffin-embedded tumour samples from13 MALT lymphoma were subjected to rearrangement analysis, by using PCR, heteroduplex gels and sequence analysis.</p><p>Successful amplification was seen in 10/13 cases and sequences of IgVн genes were obtained in 6/13, all of them were mutated. The percentage of mutation compared to germline sequences was 1,1% to 8,6% monoclonal rearrangemang. It was demonstrated that 5 of 7 clones were derived from the Vн3 family, 2 from Vн1 and 1 from the Vн 4 family.</p>
104

Virškinimo procesų karvių didžiajame prieskrandyje ir jų produktyvumo tyrimai, naudojant šėrimui pramonės šalutinius produktus / Investigation of effects of industrial by-products on ruminal digestibility and lactation performance of cows

Šidagis, Darius 10 January 2014 (has links)
Darbo tikslas: Ištirti glicerolio, kvietinių sėlenų su krakmolo gamybos sirupo granulių ir salyklo daigelių efektyvumą melžiamų karvių racionuose bei įvertinti jų įtaką azotinių medžiagų fermentacijai karvių didžiajame prieskrandyje. Darbo uždaviniai: 1. Ištirti krakmolo gamybos sirupo, kvietinių sėlenų ir krakmolo gamybos sirupo granulių, salyklo daigelių cheminę sudėtį ir apskaičiuoti energetinę vertę. 2. Atlikti penkis šėrimo bandymus su melžiamomis karvėmis: tris bandymus panaudojant glicerolį skirtingais laktacijos periodais, vieną – naudojant krakmolo dekstrinų sirupą ir vieną – naudojant salyklo daigelius. 3. Nustatyti karvių racionų pašarų ėdamumą. 4. Atlikti karvių didžiojo prieskrandžio (Rumen) turinio tyrimus, jame nustatyti: sausąsias medžiagas, infuzorijų skaičių, pH, lakių riebalų rūgščių (LRR) suminį kiekį ir procentinį santykį, bendro ir amoniako azoto kiekius. 5. Įvertinti tiriamų pašarų įtaką pieno primilžiui, nustatyti pieno riebalų ir baltymų kiekius ir įvertinti ekonominį efektyvumą. 6. Tyrimų duomenis apdoroti statistiškai pateikiant aritmetinius vidurkius ir aritmetinio vidurkio paklaidą. Mūsų tyrimuose pirmą kartą Lietuvoje glicerolis panaudotas kaip pašaras melžiamų karvių racionuose skirtingais laktacijos periodais drėgnuose pašarų mišiniuose, sėlenų granulės, praturtintos krakmolo dekstrinų sirupu ir salyklo daigeliai nustatant jų poveikį azotinių medžiagų ir angliavandenių fermentacijai karvių didžiajame prieskrandyje, jų produktyvumui bei... [toliau žr. visą tekstą] / The purpose of the study: To investigate the efficiency of glycerol, wheat bran with starch dextrin syrup pellets and malt shoots in the diets of lactating cows and the effects of these products on nitrogen matter fermentation in the rumen of cows. Objectives: 1. To analyze the chemical composition and calculate the energy value of starch syrup, wheat bran and starch syrup pellets and malt shoots. 2. To carry out 5 feeding trials with lactating cows, i. e. 3 trials using glycerol at different lactation periods, one – using starch dextrin syrup and one – using malt shoots. 3. To determine the intake of feeds in the diets. 4. To study rumen contents for the analysis of dry matter, infusoria count, pH-value, total volatile fatty acids (VFA) and percentage ratio, contents of total and ammonia nitrogen. 5. To assess the influence of the above feedstuffs on milk yields, milk fat and protein contents and economic efficiency. 6. To statistically process the data and give arithmetic means and mean deviations. In this study for the first time in Lithuania, glycerol was used as a feedstuff in the diets of lactating cows at different lactation periods in wet mash, bran pellets enriched with starch dextrin syrup and malt shoots for determination of their effect on nitrogen matter and carbohydrate fermentation in the rumen of cows, cow productivity and economic efficiency. Practical application: After completion of the study, recommendations for milk producers were prepared on the usage of... [to full text]
105

Determinação do percentual de malte de cevada em cervejas tipo Pilsen utilizando os isótopos estáveis do carbono ('delta' 'inpot.13C') e do nitrogênio ('delta' 'inpot15N')

Sleiman, Muris [UNESP] 03 February 2006 (has links) (PDF)
Made available in DSpace on 2014-06-11T19:31:35Z (GMT). No. of bitstreams: 0 Previous issue date: 2006-02-03Bitstream added on 2014-06-13T20:02:23Z : No. of bitstreams: 1 sleiman_m_dr_botfca.pdf: 830460 bytes, checksum: a045f031359bcdcbafd59a7f88312024 (MD5) / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / Universidade Estadual Paulista (UNESP) / O objetivo deste trabalho foi desenvolver uma metodologia para quantificar a proporcao de malte e adjunto utilizada na elaboracao de cervejas do tipo Pilsen. Alem disso, verificou-se a possivel ocorrencia de fraude nas cervejas comerciais fabricadas no Brasil e foi avaliada a correlacao entre o percentual de malte com o preco de varejo da bebida. Para isso, foi testada a metodologia de isotopos estaveis atraves dos elementos quimicos carbono (13C) e nitrogenio (15N). Materias-primas cervejeiras (malte, grits de milho, quirera de arroz, xarope de maltose (HMCS) e acucar de cana), oriundas de diferentes regioes geograficas, foram usadas para a producao de mostos puros e misturas destes, a fim de produzir fermentados padroes de referencia para a construcao de gretas de calibracao-h, a partir das quais se propos um modelo de comportamento para a populacao de cervejas, atraves de analise de regressao linear invertida. Tambem foi calculado um intervalo de confianca ao nivel de 90% para a quantificacao do percentual mais provavel (PMP) de malte presente nas cervejas. Posteriormente, foram feitas analises isotopicas e fisico-quimicas de cervejas comerciais de dezessete estados brasileiros produtores da bebida. A partir dos resultados obtidos, concluiu-se que a cevada e o malte assemelham-se entre si para os dois isotopos analisados, nao sendo possivel sua diferenciacao. As analises de Â13C sao mais indicadas para 2 se calcular o PMP de malte para cervejas elaboradas com malte e adjunto proveniente de planta de ciclo fotossintetico C4, enquanto que as analises de Â15N sao recomendadas para o calculo do PMP de malte em amostras de cerveja elaboradas com malte e arroz (C3). Foram analisadas 161 amostras de cervejas, sendo que 91,3 % utilizaram malte e adjuntos derivados de planta de ciclo C4 em sua formulacao, 4,3 % apresentaram arroz... / The objective of this work was to develop a methodology to quantify the proportion of malt and the adjunct used in the Pilsen beer brewing, to verify the possible occurrence of fraud in beer brewed in Brazil and to evaluate the correlation between the percent of malt with the beer retail price. Therefore, the methodology of stable isotopes using the chemical elements carbon (13C) and nitrogen (15N) was tested. Raw material of beer (malt, corn grits, rice, high maltose corn syrup and sugar cane) coming from different geographical regions, were used for the production of pure worts and their mixtures. These mixtures turned fermented standards of reference to make calibration straight lines, from which a model was proposed by inverted linear regression analysis, that to conduct for all Pilsen beer. Also a range of trust was calculated at a level of 90 % to quantify the most likely percentage (MLP) of malt present in beer. After that, stable isotopic analyses and physical-chemical analyses were made of brewing beer from seventeen Brazilian States brewers of beer. The results showed that barley and malt are similar in the two analyzed isotopes, not being possible to separate them. The analysis of ä13C presented the MLP of malt in brewed beer with malt and the adjunct coming from the C4 plant, and the analysis of ä15N provided the MLP of malt in beer brewed with malt and rice (both C3 plant). One hundred sixty one samples of Brazilian beer were analyzed, from which 91,3 % used malt and adjuncts of the C4 plant in its formulation, 4,3 % showed rice, 4,3% were classify like pure malt beer. From the total, 28,6 % were in the doubt range as for the MLP of malt... (Complete abstract click electronic access below)
106

Potencial antioxidante e atividade vasodilatadora de cervejas comerciais / Antioxidant potential and vasodilator activity of commercial beers

Oliveira Neto, Jerônimo Raimundo de 05 May 2017 (has links)
Submitted by Marlene Santos (marlene.bc.ufg@gmail.com) on 2018-08-14T17:49:15Z No. of bitstreams: 2 Tese- Jerônimo Raimundo de Oliveira Neto - 2017.pdf: 3024039 bytes, checksum: b381958f2c5d4a901e5c5cb791c482a7 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2018-08-16T11:36:48Z (GMT) No. of bitstreams: 2 Tese- Jerônimo Raimundo de Oliveira Neto - 2017.pdf: 3024039 bytes, checksum: b381958f2c5d4a901e5c5cb791c482a7 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) / Made available in DSpace on 2018-08-16T11:36:48Z (GMT). No. of bitstreams: 2 Tese- Jerônimo Raimundo de Oliveira Neto - 2017.pdf: 3024039 bytes, checksum: b381958f2c5d4a901e5c5cb791c482a7 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2017-05-05 / Beer is one of the oldest and most popular beverages consumed by mankind, the main classification of beers is the type of fermentation, divided into ale or lager, high and low fermentation, respectively. In this study, beer samples were divided into two portions, the first one for the spectrophotometric and electrochemical tests, which was used in natura form. And the second part was lyophilized, aiming at the concentration use standardization, alcohol withdrawal and guaranteeing an increase of durability, and then used in the pharmacological and chromatographic tests. The aim of this study was to investigate the antioxidant potential and vasodilator activity and correlate them with the phenolic profiles of twenty-two commercial beers. In addition, the antioxidant activity and the phenolic profile of hops and malts from different origins were also verified. From the raw materials, hops samples showed better antioxidant activity when compared to malt samples (p <0.05). The correlation between electrochemical index (EI) and total phenols (TPC), and radical scavenging methods, 1,1-diphenyl-1-picrylhydrazyl (DPPH) and 2,2'-azinobis (3-ethylbenzthiazoline -6-sulphonic acid) (ABTS) was 0.86, 0.77 and 0.85 respectively for the hop samples. From the beers, ale group showed better antioxidant activity and TPC values when compared to the lager group. However, according to the Pearson correlation matrix, the correlation between IE with TPC, DPPH and ABTS was 0.86, 0.89 and 0.96 respectively for the lager group. While for the ale group, the correlations were not statistically significant (p> 0.05), mainly due to the turbidity interference of the samples during spectrophotometric assays. This fact reiterates the use of electrochemical methods, which minimize this type of problem besides being more sensitive and quick. Following the proposed electrochemical methodology, using the IE calculation, LB10 and AB1 samples obtained the highest indices. In the results of the principal components analysis (PCA) three groups were observed, where group III confirms LB10 and AB1 as the best antioxidants potential. LB10, AB1 and AB6 showed a maximal vasodilator effect of 92 ± 4, 88 ± 3 and 79 ± 3%, respectively. Both the vasodilator effect and the lipid peroxidation inhibition capacity may be associated with the presence of phenolic compounds in the beer samples, identified by mass spectrometry. This study, therefore, verified that the proposed IE methodology is an important tool to evaluate antioxidant properties and showed a good correlation with radical scavenging assays. Moreover, the study showed that beers may have a beneficial effect on the cardiovascular system, showing a good correlation of the vasodilator effect and antioxidant potential, which may be useful for future research on health, sensorial properties and quality parameters. Still from the standpoint of the quality of the beers, hop extracts as well as malt exhibited statistically results, corroborating to the applicability of these tools in the choice of these major ingredients improve the quality of the final product. / A cerveja é uma das bebidas mais antigas e populares consumidas pela humanidade, a principal classificação das cervejas é quanto ao tipo de fermentação, dividindo-se em ale ou lager, alta e baixa fermentação, respectivamente. Neste estudo, as amostras de cerveja foram divididas em duas porções, a primeira para os ensaios espectrofotométricos e eletroquímicos, a qual foi utilizada de forma in natura. E a segunda parte foi liofilizada, para padronização da concentração de uso, retirada do álcool e garantir uma maior durabilidade, e então utilizada nos ensaios farmacológicos e cromatográficos. O objetivo deste estudo foi investigar o potencial antioxidante, a atividade vasodilatadora e correlacionar com os perfis fenólicos de vinte e duas cervejas comerciais. Adicionalmente foi também verificada a capacidade antioxidante e o perfil fenólico de lúpulos e maltes de diferentes origens. Das matérias-primas, as amostras de lúpulo mostraram uma melhor atividade antioxidante quando comparadas com as amostras de malte (p<0,05). A correlação entre o índice eletroquímico (IE) com os fenóis totais (TPC), e os ensaios de captura de radicais, 1,1- difenil-1-picril-hidrazil (DPPH) e 2,2’-azinobis (3-etilbenzotiazolina-6-ácido sulfônico) (ABTS) foi de 0,86, 0,77 e 0,85 respectivamente para as amostras de lúpulo. Enquanto que para as amostras de malte foi 0,49, 0,69 e 0,96, respectivamente. Análise de variância (ANOVA) foi utilizada para verificar diferenças dentro de cada grupo de matéria-prima, sendo observadas diferenças a nível de 95% de confiança (p<0,05). Das cervejas, o grupo ale mostrou melhores capacidade antioxidante e valores de fenóis totais quando comparado com o grupo lager. Porém, de acordo com a matriz de correlação de Pearson, a correlação entre o IE com TPC, DPPH e ABTS foi de 0,78, 0,82 e 0,89 respectivamente para o grupo lager. Enquanto que para o grupo ale as correlações não foram estatisticamente significativas (p>0,05), principalmente devido à interferência da turbidez das amostras durante ensaios espectrofotométricos. Este fato reitera o uso de métodos eletroquímicos, que minimizam este tipo de problema além de serem mais sensíveis e rápidos. Seguindo a metodologia eletroquímica proposta, através do cálculo do IE, as amostras LB10 e AB1 obtiveram os maiores índices. Nos resultados da análise de componentes principais foram observados três grupos, onde o grupo III confirma LB10 e AB1 como as de melhores potenciais antioxidantes. LB10, AB1 e AB6 mostraram efeito vasodilatador máximo de 92 ± 4, 88 ± 3 e 79 ± 3%, respectivamente. Tanto o efeito vasodilatador quanto a capacidade de inibição da peroxidação lipídica, podem estar associados à presença de compostos fenólicos nas cervejas, identificados via espectrometria de massa. Este estudo, portanto, verificou que a metodologia proposta do IE é uma importante ferramenta para avaliar as propriedades antioxidantes e mostrou uma boa correlação com ensaios de eliminação de radicais. Além disso, o estudo mostrou que as cervejas podem ter um efeito benéfico sobre o sistema cardiovascular, apresentando boa correlação do efeito vasodilatador e o potencial antioxidante, o que pode ser útil para pesquisas futuras sobre a saúde, propriedades sensoriais e parâmetros de qualidade. Ainda sobre o ponto de vista da qualidade das cervejas, os extratos de lúpulo, assim como de malte, apresentaram resultados estatisticamente diferentes entre si, corroborando para aplicabilidade destas ferramentas na escolha destes ingredientes majoritários em prol da qualidade do produto final.
107

Molecular pathogenesis of MALT lymphoma

Hamoudi, Rifat A. January 2010 (has links)
Mucosa associated lymphoid tissue (MALT) lymphoma is characterized by t(11;18)(q21;q21)/API2-MALT1, t(1;14)(p22;q32)/BCL10-IGH andt(14;18)(q32;q21)/IGH-MALT1, which commonly activate the NF-κB pathway. Gastric MALT lymphomas harbouring such translocation do not respond to Helicobacter pylori eradication, while those without translocation can be cured by antibiotics. To understand the molecular mechanism of MALT lymphoma with and without chromosome translocation, 24 cases (15 translocation-positive and 9 translocation-negative) of MALT lymphomas together with 7 follicular lymphomas and 7 mantle cell lymphomas were analysed by Affymetrix gene expression microarray platform. Unsupervised clustering showed that cases of MALT lymphoma were clustered as a single branch. However, within the MALT lymphoma group, translocation-positive cases were intermingled with translocation-negative cases. Gene set enrichment analysis (GSEA) of the NF-κB target genes and 4394 additional gene sets covering various cellular pathways, biological processes and molecular functions showed that translocation-positive MALT lymphomas were characterized by an enhanced expression of NF-κB target genes, particularly TLR6, CCR2, CD69 and BCL2, while translocation-negative cases were featured by active inflammatory and immune responses, such as IL8, CD86, CD28 and ICOS. Separate analyses of the genes differentially expressed between translocation-positive and negative cases and measurement of gene ontology term in these differentially expressed genes by hypergeometric test reinforced the above findings by GSEA. The differential expression of these NF-κB target genes between MALT lymphoma with and without translocation was confirmed by quantitative RT-PCR and immunohistochemistry or Western blot. Expression of TLR6, in the presence of TLR2, enhanced both API2-MALT1 and BCL10 mediated NF-κB activation in vitro. In addition, there was cooperation between expression of BCL10, MALT1 or API2-MALT1, and stimulation of the antigen receptor or CD40 or TLR in NF-κB activation as shown by both reporter assay and IκBα degradation. Interestingly, expression of BCL10 but not API2-MALT1 and MALT1, in the presence of LPS stimulation, also triggered IκBβ degradation, suggesting activation of different NF-κB dimers between these oncogenic products. Study by co-immunoprecipitation showed that BCL10 directly interacts with MALT1. Sub-cellular localisation experiments in BJAB B-cells, showed that BCL10 localisation was affected by MALT1. When BCL10 was over-expressed, the protein was predominantly expressed in the nuclei, but when MALT1 was over-expressed, BCL10 was mainly localised in the cytoplasm. When both BCL10 and MALT1 were over-expressed, BCL10 was expressed in the cytoplasm in the early hours when the protein level was low, but in both the cytoplasm and nuclei after 9 hours when the protein level was high. Over-expression of API2-MALT1 did not shown any apparent effect on BCL10 sub-cellular localisation in vitro. Finally, comparison of MALT lymphoma expression microarray with other lymphomas showed lactoferrin to be highly expressed in MALT lymphoma. This was confirmed by qRT-PCR, showing lactoferrin to be significantly over-expressed in MALT lymphoma compared to FL and MCL. Thus lactoferrin may be a potential marker for MALT lymphoma.
108

Ökad effektivitet inom lastningsprocesser : En fallstudie enligt DMAIC vid Viking Malts lastningsprocesser av malt / Increased efficiency within loading processes : A DMAIC case study at Viking Malts loading processes of malt

Andersson, Peter, Sundberg, Jacob January 2020 (has links)
Effektivitetsparadoxen, där flödeseffektivitet vägs mot resurseffektivitet, är en utmaning sominnebär en balansgång mellan resursers värdeadderande tid och flödesenhetersvärdemottagande tid. Viking Malt, ett av Europas största mälterier, är ett företag som tampasmed detta ställningstagande. Examensarbetet är genomfört vid deras produktionsanläggning iHalmstad där effektivitetsproblem uppdagats som en konsekvens av långa och varierandecykeltider i lastningsprocesser. Implikationerna blir försvårad planering och nekande avtilläggsbeställningar, varpå ytterligare kundsamarbeten uteblir. Dessutom finns ett missnöjebland de anställda som berör icke-ergonomiska arbetsmoment, vilket kan hämma effektivitetoch arbetssäkerhet. Syftet med examensarbetet har därför varit att utreda och ta fram rekommendationer för hurViking Malt kan arbeta för att effektivisera lastningsprocesserna. Dessutom förväntas arbetetbidra med ökad processkännedom samt förbättrad ergonomi och säkerhet. Syftet har uppnåttsgenom ett Sex Sigma projekt där problemlösningsmetodiken DMAIC tillämpats. Underexamensarbetets gång inriktades arbetet alltmer mot den lastningsprocess i vilken malten fyllsdirekt i en container, i rapporten benämnd loading (container). Examensarbetet har genom analyser av observationer, intervjuer och sekundärdata kunnatidentifiera faktorer som orsakat ett ojämnt flöde och icke-ergonomiska arbetsmoment.Förbättringsförslag har därför utformats för att motverka problematiken. Förslagen som beröreffektivitetsförbättringar har simulerats i syfte att validera dess trovärdighet och bidra medrealistiska kalkyler. En åtgärdsplan med lösningsförslag till icke-ergonomiska arbetsuppgifter och ineffektivalastningsprocesser har upprättats, vilket förutspås gagna fallorganisationens fortsattaförbättringsarbete. Konceptuellt framtogs ett ergonomiförbättrande verktyg som förväntasförbättra arbetsmiljö och ergonomi. De ekonomiskt kvantifierbara förslagen beräknas ökalastningskapaciteten med drygt 10,5 procent, vilket motsvarar en ökad bruttovinst med 1 047500 kronor årligen.
109

Stanovení beta-glukanů a pentosanů v surovinách pro výrobu piva a v pivu / Determination of beta-glucans and pentosans in raw materials for production of beer and in beer

Piškulová, Lenka January 2017 (has links)
The content of beta-glucans and arabinoxylans in barley grain, malt and wort was monitored. The varieties of barley were Pionier, Libuše, Manta, Tango, KWS Amadora, Kampa, KWS Irina, Francin, Odyssey, Overture, Vendela, Petrus, Laudis 550, Sunshine, Kangoo, Xanadu, Sebastian, Bojos and Malz. These varieties were grown on three different habitats (Uherský Ostroh, Věrovany and Vysoká u Příbramě). The content of beta-glucans and arabinoxylans was also analysed in five different types of beer. In brewing and malting industry the content of beta-glucans and arabinoxylans is mainly monitored because of their negative influence on decanting of wort and filtration of beer. These substances can contribute to turbidity and precipitation in beer and thus negatively effect the stability of beer. The content of beta-glucans in barley grain, malt, wort and beer was determined by FIA method and the content of arabinoxylans was determined in barley grain, wort and beer by Douglas method. The highest content of beta-glucans in barley grain was found in 14/19 varieties at Uherský Ostroh, where the amount of beta-glucan content was in the range of 3,65-5,60 %. The highest beta-glucan content in malt was found in 17/19 varieties at Vysoká u Příbramě, where the beta-glucan content was between 0,15-0,79 % and the highest content of beta-glucans in wort was found in 16/19 varieties also at Vysoká u Příbramě. There was the beta-content in the range of 22-184 mg/l. The results of content of arabinoxylans in barley grain and wort were more balanced. The highest content of arabinoxylans in barley grain was found in 10/19 varieties at Věrovany. The content of arabinoxylans at this habitat was in the range of 3,04-4,56 %. The highest content of arabinoxylans in wort was determined in 8/19 varieties at Uherský Ostroh. The content of arabinoxylans at this habitat was in the range of 542-1040 mg/l. The highest content of beta-glucans in samples of beer was determined in a sample of light lager (207 mg/l) and the highest content of arabinoxylans was found in a samle of wheat lager (1465 mg/l).
110

Vývoj miniaturizované extrakční metody pro screening netěkavých nitrososloučenin ve sladu pomocí GC-NCD / Development of miniaturized extraction method used for GC-NCD screening of non-volatile nitroso compounds in malt

Malečková, Michaela January 2018 (has links)
The aim of this diploma thesis was to develop a miniaturized extraction method for a fast screening of non-volatile nitroso compounds using gas chromatography with a nitroso specific chemiluminescence detection. According to a final methodology, the samples were prepared by extraction of grinded malt using a mixture of pyridine and acetonitrile in ratio 60:40 (v/v). To enhance volatility of the determined analytes, the two-step derivatization using hexamethyldisalazane and N,O-bis(trimethyl)-trifluoroacetamide was used. The total volume of the sample was 200 l and the preparation time after optimization was in total 80 min. The extraction method was connected to a classification method, which can divide chromatographic peaks into the groups of N-nitroso and C-nitroso compounds, and interfering substances. After application of the methods mentioned above to real malt samples, the specific chromatographic peaks of C-nitroso and N-nitroso compounds were selected. Description of their properties and structure suggestion will be a subject of the following study. Keywords Nitroso compounds, malt, extraction, derivatization, gas chromatography, chemiluminescence detector

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