Índice de polifenóis, antocianinas totais e atividade antioxidante de um sistema modelo de geléia de uvas

Antocianinas são pigmentos fenólicos com potencial para substituição dos corantes artificiais vermelhos; porém, estes se apresentam instáveis frente ao processamento de alimentos, sendo a temperatura um dos principais fatores envolvidos na degradação da cor destes pigmentos. O objetivo deste trabalho foi avaliar a concentração de compostos fenólicos e a capacidade antioxidante de um sistema modelo de geléia de uvas (SMG) Isabel (Vitis labrusca) e Refosco (Vitis vinifera L.) elaborado a 45 °C, utilizando como agente espessante uma mistura de gomas xantana e locusta. Nos SMGs elaborados, avaliou-se a estabilidade dos pigmentos antociânicos e determinou-se polifenóis totais (IPT), antocianinas totais (AT). A atividade antioxidante foi medida utilizando os métodos de captura de radicais estáveis como o radical DPPH (2,2-difenil-1-picril-hidrazila) e o radical ABTS (2,2’-azino-bis-(3-etilbenzotiazolina-6-ácido sulfônico)). Avaliou-se também a concentração de AT nos extratos de uvas utilizados na elaboração do SMG. Um alto coeficiente de correlação foi encontrado entre AT e IPT dos SMGs e a atividade antioxidante. Os melhores resultados quanto à concentração de IPT, AT e em relação à atividade antioxidante foram obtidos para o SMG elaborado com uva Refosco. O método utilizado para a elaboração dos SMGs foi efetivo na preservação da cor antocianinas e das propriedades antioxidantes dos compostos fenólicos totais avaliados.

Atividades das enzimas peroxidase (POD) e polifenoloxidase (PPO) nas uvas das cultivares benitaka e rubi e em seus sucos e geléias

A peroxidase e a polifenoloxidase estão relacionadas com o escurecimento de frutas, por isso o controle das atividades destas enzimas é de grande importância para a tecnologia de alimentos. Neste trabalho estudaram-se as atividades dessas enzimas nas uvas frescas das cultivares Benitaka e Rubi, bem como as suas termoestabilidades e as suas atividades enzimáticas residuais no suco e nas geléias (extra e light). Foi também avaliada a qualidade microbiológica dos produtos elaborados. As atividades da enzima POD, tanto da fração solúvel quanto da ionicamente ligada, foram semelhantes nas uvas das duas variedades, Benitaka e Rubi. A atividade da enzima polifenoloxidase foi maior na variedade Rubi. As operações de cocção e pasteurização foram mais eficientes para baixar as atividades enzimáticas residuais da POD e PPO quando aplicadas às geléias de uva, em comparação com o suco. Embora não foram suficientes para a total inativação enzimática, essas operações reduziram-nas consideravelmente, e foram eficientes para garantir seguridade microbiológica dos produtos, geléias e suco.

Pós-colheita de uva 'Itália' revestida com filmes à base de alginato de sódio e armazenada sob refrigeração

Este trabalho teve como objetivo avaliar o efeito da aplicação de película à base de alginato de sódio em diferentes concentrações na conservação pós-colheita de uva 'Itália' armazenada sob refrigeração. Cachos de uva 'Itália' colhidos em Pirapora (SP) foram selecionados, previamente higienizados com solução de álcool etílico a 30%, imersos em solução de cloreto de cálcio a 0,6% por 2 minutos e, em seguida, em emulsão de alginato de sódio a 0,25; 0,50; 0,75 e 1,00%, antes de serem mantidos sob refrigeração (4 ± 0,7 °C; 49,5% UR) por 29 dias. Avaliou-se a cada sete dias a porcentagem de perda de peso dos cachos, a coloração, a textura, os teores de Sólidos Solúveis (SS), de Acidez Titulável (AT) e de ácido ascórbico, o ratio (SS/AT), o pH e o teor de umidade das bagas. As bagas também foram avaliadas quanto à aceitação por 30 provadores não treinados. O tratamento com alginato a 1,00% proporcionou melhor eficiência quanto à perda de massa, manutenção da textura, teores de umidade e de sólidos solúveis, além de propiciar menor intensidade no escurecimento das bagas. As bagas tratadas com película de alginato a 0,75% mostraram-se mais verdes, mais ácidas e com menor ratio. Ao longo de todo o período, todas as bagas tratadas com alginato foram bem aceitas pelos provadores. A cobertura com alginato a 1% mostrou-se mais eficiente na conservação da uva 'Itália'.

Caracterização físico-química e aminas bioativas em vinhos da cv. Syrah I: efeito do ciclo de produção

A ocorrência sistemática de dias chuvosos ou com alta nebulosidade e temperaturas ambientais elevadas prejudicam a maturação e a sanidade das uvas. Estudos recentes indicam que a alteração do ciclo de produção da videira através da poda possibilita colher uvas em épocas mais favoráveis à maturação, e com níveis de produção aceitáveis. Neste sentido, o presente trabalho teve como objetivo avaliar o perfil analítico dos vinhos de Syrah de safras de verão e inverno dos anos 2005 e 2006 produzidos em Três Corações (MG). Os vinhos do inverno de 2005 apresentaram valores superiores de pH (3,91 × 3,59), polifenóis totais (49,2 × 32,5), intensidade de cor (10,75 × 5,68), antocianinas (121,48 × 41,09 mg.L-1 ), fenólicos totais (2,06 × 1,21 g.L-1), álcool (12,65 × 10,78% v/v) e aminas bioativas (10,36 × 4,46 mg.L-1) quando comparados aos de verão. Comportamento semelhante foi obtido na safra de 2006. Os vinhos de inverno apresentaram maior conteúdo de compostos fenólicos, o que indica maior qualidade e maior potencial de guarda. Entretanto, o cultivo em estação seca e o elevado pH do mosto contribuíram para um aumento no teor de aminas bioativas, cuja evolução deve ser controlada na vinificação para evitar riscos à saúde humana.

Study of bacteria Gluconobacter sp.: isolation, purification, phenotypic and molecular identification

The importance of the study of acetic bacteria, on species of the Gluconobacter genus is based on its industrial application, as these possess the capacity of bioconversion of sorbitol to sorbose, enabling the process of vitamin C production. The study involved samples collected in industries of soft drinks, flowers, fruits and honey, followed by purification, phenotypic identification, molecular identification with the use of primer defined from Nucleotide Sequence Database consultation. Strains preserved were identified as members of the Acetobacteraceae family, Gluconobacter genus. 110 strains had been isolated of substrate: Pyrostegia venusta (ker-gawler), honey, Vitis vinifera (grape), Pyrus communis (pear), Malus sp. (apple) and in two samples of soft drinks. Of this total 57 strains had been recovered in manitol medium (manitol, yeast extract, peptone), 12 in YMG medium (glucose, manitol, yeast extract, ethanol, acetic acid), 41 in enrichment medium (De Ley and Swings) and later in the GYC medium (glucose, yeast extract and calcium carbonate). 68 strains were identified as Gram negative bacilli rods. Of these, 31 were characterized biochemically as belonging to the Acetobacteriaceae family as they were catalase positive, oxidase negative and producers of acid from glucose. The characterization of these strains was complemented with the biochemistry tests: gelatin liquefaction, nitrate reduction, indole and H2S production, oxidation of ethanol to acetic acid and molecular tests for genus identification. Only eight strains were characterized as pertaining to the Gluconobacter genus. The strains are maintained in collection cultures at the Microbiology Laboratory of the Biology Department at the São Paulo State University (UNESP) in Assis, stored in malt extract at -196 ºC.

Colour, phenolic content and antioxidant activity of grape juice

Viticultural practices in the State of Santa Catarina, Brazil, have shown economic growth, with the production of grapes used to produce wines and grape juice. Grapes are rich in phenolic compounds which have drawn attention not only because of their important role in the development of products derived from grapes, but also for their potential beneficial health effects. The objective of this study was to evaluate commercial, organic and homemade grape juices produced in Santa Catarina. Grape juices were analyzed for total phenolic content, colour, and antioxidant activity. The commercial juices had the highest average values for total monomeric anthocyanins and total phenolics. There was a strong positive correlation (R = 0.9566) between the antioxidant activity and total phenolic content for the commercial juice. In addition, the Principle Components Analysis showed a strong positive correlation between the red colour and total monomeric anthocyanins. However, the total monomeric anthocyanis and polymeric anthocyanins showed a negative correlation.

Effect of trellising system on grape and wine composition of Syrah vines grown in the cerrado region of Minas Gerais

Based on the concept that the trellising system affects not only sunlight interception and carbon assimilation, but also the fruitzone microclimate, which has a great impact on fruit composition and consequently on wine quality, the effect of two trellising systems - Vertical Shoot Position (VSP) and modified Geneva Double Curtain (GDC) - on wine and berry composition of Syrah grapes grown in João Pinheiro, Northeast region of Minas Gerais State, Brazil was investigated. The parameters such as pH, berry size and weight, and seeds total phenolic contents were not affected by the training system. The GDC system produced fruits with the highest Brix and lowest titratable acidity. Berries from the VSP system presented lower anthocyanin concentration than those from the GDC system. Similar results were found for the total phenolic content of the skin of grape berries from the VSP system. GDC wines were characterized by high anthocyanin content and red color, resulting in wines with high color intensity. These data suggest that in the tropical region of Minas Gerais state, with high temperature and high sunlight intensity, the trellising system, which protects bunches against excessive radiation, should be chosen.

Characterization of maturity and quality of Brazilian apirenic grapes in the São Francisco river Valley

The objective of this study was to characterize and correlate maturity and quality of the first varieties of Brazilian seedless grapes 'BRS Clara', 'BRS Linda', 'BRS Morena', and 'Advanced Selection 8' compared with the American variety 'Crimson Seedless' in compliance with the Brazilian Normative/2002 and export standards Advanced Selection 8' is dark reddish, has large clusters, and is a very large ellipsoid berry; 'BRS Morena' is black with medium sized clusters and large berry shaped as ellipsoid to globoid; 'BRS Linda' is light green and has large sized clusters; 'Crimson' is pink and has small clusters with berries varying from medium to large sizes and ellipsoid shaped; and 'BRS Clara' is green yellowish has medium sized clusters and small berry of elongated ellipsoid shape. All varieties evaluated meet the standard for domestic market established as berry size minimum diameter 12 mm. 'BRS Clara' does not meet the export requirements of diameter. Berries of the red grapes 'BRS Morena' and 'Crimson Seedless' are firmer. The pH, titratable acidity, and soluble solids meet the official standards. Larger clusters are less acidic and present higher soluble solids/titratable acidity ratios implying that they are the sweetest type when ripe.

Research on the quality of the wine grapes in corridor area of China

The corridor area of Gansu Province is one of the most important wine grape growing regions in China, and this strip of land results in a significant difference in terms of terroir between its regions. Chemical composition and antioxidant capacity of the main wine grape varieties (Vitis vinifera L.) cultivated in the corridor area of Gansu Province in northwest China were compared. Three regions (Zhangye, Wuwei, and Jiayuguan) were selected to explain the influence of soil and climate conditions on the quality of wine grapes. This study aims to investigate the effect of different regions on berry composition and antioxidant capacity, providing a general evaluation of red and white wine grapes quality in the corridor area of China. The results showed that ‘Merlot’ grapes grown in Zhangye had the best quality among the different varieties in the three regions of Gansu evaluated. The moderate temperature and nitrogen deficiency were associated with improved fruit quality. It was identified that the most suitable grape variety from Zhangye is ‘Merlot’, and that ‘Cabernet Sauvignon’ and ‘Italian Resling’ are the most suitable varieties from Wuwei and Jiayuguan, respectively.

Assessing the influence of irrigation and fertigation on fruit composition, vine performance and wine quality in a cool, humid climate /

A study was devised to evaluate influences of irrigation and fertigation practices on Vitis vinifera and Vitis labruscana grapes in the Niagara Peninsula. A modified FAO Penman- Monteith evapotranspiration formula was used to calculate water budgets and schedule irrigations. Five deficit irrigation treatments (non-irrigated control; deficits imposed postbloom, lag phase, and veraison; fiiU season irrigation) were employed in a Chardonnay vineyard. Transpiration rate (4-7 /xg H20/cmVs) and soil moisture data demonstrated that the control and early deficit treatments were under water stress throughout the season. The fiiU season irrigation treatment showed an 18% (2001) and 19% (2002) increase in yield over control due to increased berry weight. Soluble solids and wine quality were not compromised, and the fiiU season treatment showed similar or higher °Brix than all other treatments. Berry titratable acidity andpH also fell within acceptable levels for all five treatments. Irrigation/fertigation timing trials were conducted on Concord and Niagara vines in 2001- 02. The six Concord treatments consisted of a non-irrigated control, irrigation fi^om Eichhom and Lorenz (EL) stage 12 to harvest, and four fertigation treatments which applied 70 kg/ha urea. The nine Niagara treatments included a non-irrigated control, two irrigated treatments (ceasing at veraison and harvest, respectively) and six fertigation treatments of various durations. Slight yield increases (ca. 10% in Concord; 29% in Niagara) were accompanied by small decreases in soluble solids (1.5°Brix), and methyl anthranilate concentrations. Transpiration rate and soil moisture (1 1.9-16.3%) data suggested that severe water stress was present in these Toledo clay based vineyards.

Donald Ziraldo Fonds, 1968-2012, n.d.

Donald J. P. Ziraldo, C.M., BSc., LLD was born in St. Catharines, Ontario on October 13, 1948 to Fredrick and Irma (Schiratti) Ziraldo. He graduated Denis Morris High School in St. Catharines in 1967, and received his B.Sc. in Agriculture at the University of Guelph in 1971. In 1974, Ziraldo was running Ziraldo Nurseries when he met Austrian born schoolteacher, chemist and winemaker Karl J. Kaiser. They realized that there was a gap in the premium varietal wine market and decided to plant a premium traditional European variety of grape vine species, the Vitis vinifera. This was an innovation in the Niagara region because the current wine producers were not using premium European grapes at the time. Ziraldo and Kaiser founded and then formally incorporated Inniskillin Wines Inc. in Niagara-on-the-Lake, Ontario on July 31, 1975. Ziraldo successfully lobbied General George Kitching, CEO of the LCBO, for a winery license. In 1975, Kitching granted him a winery license, the first in Ontario since Prohibition ended. From the beginning, there was a division of labour where Kaiser focused on the winemaking and Ziraldo focused on the marketing and promotion of the wines. Ziraldo also became president of the company. Ziraldo and Kaiser worked on improving their winemaking techniques and promoting their products and company. Ziraldo has been called ‘one of the founding fathers of the Canadian wine industry’, and it is widely acknowledged that both men played a large role in the success and growth of the Canadian wine industry. Together they pioneered the estate winery movement in Canada. A major turning point Inniskillin came in 1984 when Karl Kaiser successfully harvested the first Icewine crop from frozen grapes on the vine and bottled Eiswein Vidal (Icewine). In 1990, Inniskillin received worldwide recognition for this Icewine when their 1989 Vidal Icewine won the most prestigious award in the wine world, the Grand Prix d’Honneur, given at Vinexpo in France. This victory has been called ‘the award heard round the world’ and it launched Inniskillin into the international wine arena. At the same time, this helped lift the profile of Canadian wines in general. Inniskillin not only became Canada’s leading producer of Icewine, but it also became known for producing ‘one of the world’s great wines’. After the 1990 award, Ziraldo began a major public relations campaign to promote Inniskillin and build Icewine into a worldwide brand. He travelled broadly every year to promote the brand and products and networked extensively with politicians, celebrities, chefs, sommeliers, etc. To ensure worldwide and long-term success, Ziraldo introduced Icewine to Asia and the United States which were new markets. He developed a new Icewine glass with George Riedel. Tony Aspler has called Ziraldo ‘Canada’s Wine Ambassador’. Ziraldo was President of Inniskillin Wines Inc. (Niagara) from 1975 to 2006. In 1992, Inniskillin merged with Cartier Wines, and in 1993 Cartier Inniskillin Vintners Inc. merged with T.G. Bright & Co. Limited, forming the new company Vincor International Inc. Inniskillin wines was now a subsidiary of Vincor. Ziraldo became a Director at Vincor International Inc. from 1993 to 2004. From 1989 to the mid 1990s, Ziraldo also became President of Inniskillin Napa, in Napa Valley, California. Inniskillin purchased Napa Valley vineyards and produced wines under the Terra label. In 1994, Ziraldo set up a subsidiary estate winery of Inniskillin in Oliver, British Columbia which was called Inniskillin Okanagan Vineyards Inc. He became President of the winery. This started as a partnership between Inniskillin and the local Inkameep Indian Band in the Okanagan. In 2006, Ziraldo left Inniskillin and since that time he has been involved in other Icewine related ventures such as running Ziraldo Estate Winery and producing Ziraldo Riesling Icewine 2007. He also is in partnership with the Niagara based Equifera Estate Winery to produce Equifera Icewine. His most recent projects include planting Picolit grapes in his parent’s hometown, in a project called Picolit Di Fagagna and becoming Managing Director of the Senhora Do Convento Port Winery in Portugal. Donald Ziraldo was instrumental in the creation of the Vintners Quality Alliance (VQA) in Ontario and was its founding Chair from 1988-1995. The VQA was established as a regulatory and appellation system which secured the quality and origin of Canadian wines made under this system. The VQA designation and bottle label gave the consumer confidence that the wines they were purchasing were 100% local products. The VQA system was set up first in Ontario and then in British Columbia.

Estudo da qualidade da informação constante nas bulas dos principais medicamentos fitoterápicos registrados no Brasil

Os objetivos deste trabalho foram: fazer um levantamento das dez espécies vegetais que compõem o maior número de apresentações farmacêuticas de fitoterápicos simples registradas na ANVISA; realizar o diagnóstico da oferta e da qualidade das informações contidas nas bulas das apresentações contendo as cinco espécies vegetais mais utilizadas; e definir as informações técnicas que devem estar contidas na bula de especialidades farmacêuticas que contenham como ingredientes ativos unicamente extratos preparados a partir destas espécies. O levantamento das dez espécies vegetais abrangeu o período de 01/01/1998 a 30/06/2003 e foi realizado através de consulta ao OPTLINE (www.i-helps.com). Os medicamentos fitoterápicos representam 7,76% (1888) das apresentações de registro de medicamentos no Brasil, sendo 1311 (5,38 %) apresentações de medicamentos fitoterápicos simples. Cinqüenta e oito espécies vegetais constituíam os registros de medicamentos fitoterápicos simples, sendo as dez com maior número de apresentações Ginkgo biloba L.: 302 (23,04%); Hypericum perforatum L.: 126 (9,61%); Piper methysticum F.: 87 (6,64%); Cimicifuga racemosa Nutt: 79 (6,03%); Valeriana officinalis L.: 76 (5,80%); Vitis vinifera L.: 69 (5,26%); Echinacea purpurea L.: 58 (4,42%); Aesculus hippocastanum L.: 53 (4,04%); Panax ginseng C. A Mayer: 48 (3,66%) e Cynara scolymus L.: 31 (2,36%). O diagnóstico da oferta e da qualidade das informações contidas nos textos das bulas foi realizado comparando-se estas informações com aquelas apresentadas na base de dados Medline (PubMed - www.ncbi.nhm.nhi.gov) dos últimos 5 anos e em obras bibliográficas de referência aceitas pela ANVISA, além de outras, clássicas na área de farmacognosia e fitoterapia . Foram avaliadas vinte e oito bulas. As informações de todas as bulas apresentavam incompatibilidades com as informações da literatura consultada. Os problemas mais freqüentemente encontrados foram relativos à sinonímia popular, eficácia, via de administração, contra-indicações, uso em idosos, crianças e grupos de risco, reações adversas e interações medicamentosas. Para cada uma das cinco espécies mais citadas, as informações científicas e técnicas compiladas foram organizadas como uma proposta de bula para o Profissional de Saúde a ser incluída no Compêndio de Bulas de Medicamentos (CBM), conforme previsto na Resolução-RDC nº 140/03, o qual consiste em um conjunto de bulas de medicamentos comercializados, editado pelo órgão regulador e com conteúdo da bula para o paciente e da bula para o profissional de saúde.

Biology and fertility life table of the South American fruit fly Anastrepha fraterculus on grape

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Injúrias causadas por mosca-das-frutas sul-americana em cultivares de videira

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Efeito da temperatura no armazenamento de uvas apirênicas minimamente processadas

O trabalho teve como objetivo avaliar a qualidade pós-colheita de três cultivares de uvas de mesa sem semente submetidas ao processamento mínimo e armazenadas sob refrigeração e à temperatura ambiente. Para tanto, foram utilizadas uvas das cultivares BRS Clara, BRS Linda e BRS Morena, produzidas na Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA) Uva e Vinho/Estação Experimental de Viticultura Tropical, em Jales-SP. Os cachos, depois de higienizados e imersos em água clorada a 200 mg de cloro.L-1 por 5 minutos, foram mantidos em câmara fria, a 12ºC, por 12 h. As bagas foram degranadas e lavadas em solução de álcool a 70%, por 5 segundos. Depois de escorrido o excesso da solução alcoólica, as bagas foram acondicionadas em bandejas de tereftalato de polietileno (PET) transparente com tampa e com capacidade para 500 mL. Cada unidade, contendo 200 g de bagas, foi armazenada a 12±1,8ºC e 24±0,8ºC, por 12 dias. Avaliaram-se, a cada três dias, a perda de massa fresca, a aparência, a coloração e os teores de sólidos solúveis (SS) e de acidez titulável (AT). A temperatura de 12ºC manteve a turgidez, a coloração, as qualidades organoléptica (relação SS/AT) e comercial das bagas das três cultivares testadas, por nove dias, enquanto no armazenamento à temperatura ambiente (24ºC), ocorre perda da qualidade comercial das bagas aos três dias para as cvs. BRS Clara e BRS Linda, e aos seis dias para a cv. BRS Morena.