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1.
Biol. Res ; 48: 1-8, 2015. tab
Article in English | LILACS | ID: lil-734615

ABSTRACT

BACKGROUND: The Eurasian grapevine (Vitis vinifera L.) is the most widely cultivated and economically important horticultural crop in the world. As a one of the origin area, Anatolia played an important role in the diversification and spread of the cultivated form V. vinifera ssp. vinifera cultivars and also the wild form V. vinifera ssp. sylvestris ecotypes. Although several biodiversity studies have been conducted with local cultivars in different regions of Anatolia, no information has been reported so far on the biochemical (organic acids, sugars, phenolic acids, vitamin C) and antioxidant diversity of local historical table V. vinifera cultivars grown in Igdir province. In this work, we studied these traits in nine local table grape cultivars viz. 'Beyaz Kismis' (synonym name of Sultanina or Thompson seedless), 'Askeri', 'El Hakki', 'Kirmizi Kismis', 'Inek Emcegi', 'Hacabas', 'Kerim Gandi', 'Yazen Dayi', and 'Miskali' spread in the Igdir province of Eastern part of Turkey. RESULTS: Variability of all studied parameters is strongly influenced by cultivars (P < 0.01). Among the cultivars investigated, 'Miskali' showed the highest citric acid content (0.959 g/l) while 'Kirmizi Kismis' produced predominant contents in tartaric acid (12.71 g/l). The highest glucose (16.47 g/100 g) and fructose (15.55 g/100 g) contents were provided with 'Beyaz Kismis'. 'Kirmizi Kismis' cultivar had also the highest quercetin (0.55 mg/l), o-coumaric acid (1.90 mg/l), and caffeic acid (2.73 mg/l) content. The highest ferulic acid (0.94 mg/l), and syringic acid (2.00 mg/l) contents were observed with 'Beyaz Kismis' cultivar. The highest antioxidant capacity was obtained as 9.09 μmol TE g-1 from 'Inek Emcegi' in TEAC (Trolox equivalent Antioxidant Capacity) assay. 'Hacabas' cultivar had the highest vitamin C content of 35.74 mg/100 g. CONCLUSIONS: Present results illustrated that the historical table grape cultivars grown in Igdir province of Eastern part of Turkey contained diverse and valuable sugars, organic acids, phenolic acids, Vitamin C values and demonstrated important antioxidant capacity for human health benefits. Further preservation and use of this gene pool will be helpful to avoid genetic erosion and to promote continued agriculture in the region.


Subject(s)
Citric Acid/analysis , Dietary Carbohydrates/analysis , Fruit/chemistry , Polyphenols/analysis , Vitis/chemistry , Acids/analysis , Antioxidants/analysis , Ascorbic Acid/analysis , Caffeic Acids/analysis , Coumaric Acids/analysis , Crops, Agricultural/chemistry , Crops, Agricultural/classification , Gallic Acid/analysis , Gallic Acid/analogs & derivatives , Hydroxybenzoates/analysis , Turkey , Tartrates/analysis , Vitis/classification
2.
Braz. j. microbiol ; 44(3): 679-683, July-Sept. 2013. tab
Article in English | LILACS | ID: lil-699800

ABSTRACT

The development of mold of environmental origin in honey affects its quality and leads to its deterioration, so yeasts and molds counts have been used as an important indicator of hygiene levels during its processing, transportation and storage. The aim of this study was to evaluate the levels of yeasts and molds contamination and their correlation with moisture and acidity levels in Apis mellifera L. honey from central Brazil. In 20% of the samples, the yeasts and molds counts exceeded the limit established by legislation for the marketing of honey in the MERCOSUR, while 42.8% and 5.7% presented above-standard acidity and moisture levels, respectively. Although samples showed yeasts and molds counts over 1.0 x 10² UFC.g-1, there was no correlation between moisture content and the number of microorganisms, since, in part of the samples with above-standard counts, the moisture level was below 20%. In some samples the acidity level was higher than that established by legislation, but only one sample presented a yeasts and molds count above the limit established by MERCOSUR, which would suggest the influence of the floral source on this parameter. In general, of the 35 samples analyzed, the quality was considered inadequate in 45.7% of cases.


Subject(s)
Animals , Bees , Fungi/isolation & purification , Honey/microbiology , Water/analysis , Acids/analysis , Brazil , Colony Count, Microbial , Food Analysis
3.
J Indian Soc Pedod Prev Dent ; 2008 Dec; 26(4): 149-52
Article in English | IMSEAR | ID: sea-114914

ABSTRACT

BACKGROUND: The higher incidence of dental erosion in children and teenagers possibly reflects a high intake of acidic food and beverages as well as a more frequent diagnosis on this condition. AIM: The aim of this study was to evaluate the erosive potential of acidic filling of chewing gum in primary and permanent enamel. METHODS AND MATERIALS: Eighty enamel blocks (40 primary and 40 permanent teeth) were used and randomly distributed into eight groups. Groups were divided according to types of dental substrates (permanent or primary), frequency of exposure to the acidic substance (2X or 4X/day), and concentration (pure or diluted). Exposure time to the acidic content of the chewing gum was five minutes under agitation, during five days. RESULTS: All groups showed a significant decrease in surface microhardness (P P = 0.002), D3 (pure, 4X/day) and D4 (diluted, 4X/day) (P = 0.009) regarding the concentration, then the diluted acid content was associated with a greater decrease in microhardness. Conclusion: It is concluded that the acidic filling of a chewing gum reduced the microhardness of primary and permanent enamel.


Subject(s)
Acids/analysis , Chewing Gum/adverse effects , Dental Enamel/pathology , Dental Enamel Solubility , Hardness , Humans , Hydrogen-Ion Concentration , Saliva, Artificial/chemistry , Time Factors , Tooth Erosion/etiology , Tooth, Deciduous/pathology
4.
Biofarbo ; 15(15): 5-12, dic. 2007. tab, graf
Article in Spanish | LILACS | ID: lil-507156

ABSTRACT

Los drenajes ácidos de mina (DAM) están caracterizados por acidez extrema y altas concentraciones de metales pesados y sulfatos. Las bacterias sulfato reductoras (BSR) reducen sulfatos oxidandola materia orgánica para la producción de sulfuro de hidrógeno y bicarbonato. la biorremediación consiste en la precipitación insoluble del sulfuro con los metales pesados y la alcalinización del medio por el bicarbonato.


Subject(s)
Acids/analysis , Metals, Heavy/analysis , Hydrogen Sulfide/analysis
5.
São Paulo; s.n; 2005. 228 p. tab, graf.
Thesis in Portuguese | LILACS | ID: lil-430381

ABSTRACT

O desenvolvimento de métodos analíticos e o estudo de estabilidade de formulações cosméticas e farmacêuticas fazem parte do processo de garantia de qualidade, o qual tem por objetivo assegurar a eficácia e segurança no uso de tais produtos pelo consumidor. O ácido kójico é um agente despigmentante que pode estar associado ao ácido glicólico, um agente esfoliante, a fim de ter sua ação potencializada. O objetivo do presente trabalho foi o desenvolvimnto de um método analítico para a determinação do ácido kójico a 1 porcento associado ou não ao ácido glicólico a 5 por cento em formulações tópicas na forma creme e gel, a base de excipientes comumente utilizados em farmácias de manipulação, e a realização de um estudo acelereado para avaliar a estabilidade das mesmas...


The development of analytical methods and the stability study of cosmetics and pharmaceuticals are part of the quality assurance, which has for objective to guarantee the effectiveness and security in the use of such products for the consumer. Kojic acid is a depigmentant agent that can be used in association with glycolic acid, an exfoliant agent, in order to have its action maximized. The aim of this work was the development of an analytical method to assay kojic acid 1% associated or not with 5% glycolic acid in cream and gel form, based on excipients normally used in compounding formulations, and carried out an accelerated study to evaluate its stability. To determine kojic acid in such formulations it was employed an UV first-derivative spectrophotometric method (UVD), with "zero crossing" set in 256,8 nm, where the excipients interference could be annulled. To assay both acids in association it was validated a reversed phase HPLC method with ion pairing, employed a Synergi Hidro® C18 column, mobile phase NH4H2PO4/H3PO4 buffer 30 mmol -1 pH 3,0 plus TBA (tetrabutylammonium bromide) 2 mM : acetonitrila (95:5), flow rate of 0,7 mL/min and detector PDA set in 220 nm. The samples were easily extracted and the run time was 12 min. The same experimental conditions were used to the development of a HPLC method in order to determine the kojic acid isolated in cream and gel formulations. The UVD e HPLC methods were not statistically different in terms of accuracy and precision (p = 95%). The samples submitted to the accelerated stability study, for 90 days, were stored at 40±2ºC and light 25±2ºC. All samples were also stored at room temperature protected from light. Appearance, pH, rheology and amount of kojic and glycolic acids (by HPLC) were evaluated. At the end of the study, all the samples showed physical stability, but presented decline in kojic acid above 5% at 40±2ºC. Samples stored at not accelerated conditions preserved 90% of kojic acid concentration. Therefore, a 90 days expiration date may be considered for formulations with similar composition and packing, when stored at room temperature and protected from light.


Subject(s)
Acids/analysis , Cosmetics/administration & dosage , Cosmetics/analysis , Cosmetics/chemistry , In Vitro Techniques , Melanosis , Skin Pigmentation , Chemistry, Pharmaceutical , Drug Stability , Quality Control , Spectrophotometry, Ultraviolet , Thermogravimetry
6.
GEN ; 57(3): 155-161, jul.-sept. 2003. tab
Article in Spanish | LILACS | ID: lil-396393

ABSTRACT

Se estudiaron 187 pacientes, entre 2-72 meses, 104/187 (55.61 por ciento) varones y 83/187 (44.38 por ciento) hembras. 173/187 (92.51 por ciento) se incluyeron en el grupo A (evaluación temprana) y 14/187 (7.48 por ciento) en el B (evaluación tardía). En ambos, el cáustico ingerido principalmente fue el hidróxido de sodio (lejía) (52 por ciento y 21.43 por ciento, respectivamente). El hidróxido de sodio (soda cáustica), easy off), el amoníaco, el ácido sulfúrico y la nieve carbónica (hielo seco) son los agentes productos de lesiones más severas en orofaringe y esófago. El grupo A prersentó vómitos (48.55), sialorrea (20.23 por ciento) y disfagia (10.40 por ciento), y el B disfagia (92.85 por ciento), vómitos (57.14 por ciento) y odinofagia (35.71 por ciento). A todos se les realizó endoscopia digestiva superior, dilataciones precoces en esofagitis grado II-III y dilataciones terapaúticas en los pacientes de evaluación tardía. El grupo A se resolvió con éxito. Ningún paciente ameritó intervención quirúrgica. Concluimos, que la endoscopia digestiva superior y las dilataciones precoces constituyen un método adecuado para manejar pacientes con lesiones esofágicas por cáustica antes de las 48 horas de evolución


Subject(s)
Humans , Male , Child, Preschool , Female , Infant , Child , Acids/analysis , Caustics , Endoscopy, Digestive System , Esophageal Stenosis/etiology , Gastric Dilatation , Infant Nutrition Disorders , Lye/administration & dosage , Sodium , Gastroenterology , Pediatrics , Venezuela
7.
Rev. Fac. Odontol. Bauru ; 5(3/4): 13-9, jul.-dez. 1997. tab
Article in Portuguese | LILACS, BBO | ID: lil-222586

ABSTRACT

Determinou-se a resistência adesiva por ensaios de cisalhamento da uniäo resina composta/porcelana, em funçäo de diferentes tipos de tratamento da superfície de porcelana. Cilindros de porcelana foram confeccionados e divididos em 5 grupos, os quais receberam os seguintes tratamentos: grupo I-ácido fluorídrico a 9,5 por cento; grupo II-ácido fosfórico a 37 por cento; grupo III-jatos de óxido de alumínio; grupo IV- abrasäo com ponta diamantada e grupo V- flúor-fosfato acidulado. Na sequência, em todos os grupos, os espécimes receberam aplicaçäo de primer silanizador, adesivo e resina composta. Após, os espécimes passaram por um processo de termociclagem, sendo, em seguida, submetidos a uma carga de cisalhamento na máquina de ensaios Kratos, a uma velocidade de 5mm/min., e pôde-se concluir que: o tratamento com ácido fluorídrico apresentou resistência adesiva superior aos demais tratamentos empregados, os tratamentos com ácido orto-fosfórico, jatos de óxido de alumínio, ponta diamantada e flúor-fosfato acidulado näo apresentaram diferenças estatisticamente significantes entre si


Subject(s)
Composite Resins/analysis , Dental Porcelain/analysis , Acids/analysis , Dental Restoration, Permanent , Denture, Partial, Fixed, Resin-Bonded
8.
Rev. bras. odontol ; 52(5): 46-9, set.-out. 1995. ilus, tab
Article in Portuguese | LILACS, BBO | ID: lil-160052

ABSTRACT

A pesquisa estudou o esmalte de 360 dentes decíduos anteriores, com vistas ao aspecto morfológico (luz polarizada e eletrônica de varredura). Dois ácidos (fosfórico a 37 por cento, e fluorídrico a 20 por cento), aplicados por 1 minuto separadamente e associados, foram estudados. Concluiu-se que näo existem diferenças significativas entre as espessuras de esmalte nas regiöes estudadas e foi possível identificar camadas significativas de esmalte aprismático nas faces vestibular e lingual. Os ácidos aplicados no esmalte aprismático deram padröes de descalcificaçöes significativos, principalmente quando o ácido fluorídrico foi aplicado primeiro


Subject(s)
Humans , Male , Female , Acids/analysis , Dental Enamel/anatomy & histology , Tooth, Deciduous/physiopathology
9.
Rev. farm. bioquim. Univ. Säo Paulo ; 25(2): 109-22, jul.-dez. 1989. ilus, tab
Article in Portuguese | LILACS | ID: lil-113726

ABSTRACT

Por metodos semi-empiricos de calculos de orbitais moleculares (CNDO/2, INDO e HAM/3) foram determinadas as densidades de carga e os niveis energeticos HOMO e LEMO dos acidos benzoico, 5-clorossalicilico, embonico, 3-hidroxi-2-naftoico, picrico e salicilico. Os resultados obtidos indicam que em um processo de transferencia de carga, os acidos estudados podem atuar como aceptores de eletrons. Consequentemente, muitas ligacoes que estes acidos formam com outros compostos podem ser interpretadas como complexos e nao como ligacoes de caracter ionico


Subject(s)
Acids/analysis , Chemistry, Pharmaceutical , Chemistry , Physics
10.
Rev. farm. bioquim. Univ. Säo Paulo ; 23(2): 142-51, jul.-dez. 1987. tab
Article in Portuguese | LILACS | ID: lil-47615

ABSTRACT

Foi proposta uma técnica simples e rápida para a identificaçäo de substâncias extraídas de amostras de material biológico. Para o reconhecimento do farmáco eventualmente nos extratos, säo utilizadas tabelas que demostram o comportamento de 40 substâncias usadas como padräo, seja quanto à resposta frente a duas sequências de agentes cromogênicos, ou seja quanto às respectivas médias de valores de hRf


Subject(s)
Humans , Acids/analysis , Chromatography, Thin Layer , Chromogenic Compounds/pharmacology , Poisoning/diagnosis
11.
Rev. Esc. Farm. Odontol. Alfenas ; (7): 59-76, jan.-dez. 1984. tab
Article in Portuguese | LILACS, BBO | ID: biblio-872413

ABSTRACT

Uma das doenças humanas mais estudadas nos últimos anos é a cárie dental. Entretanto, isto ocorreu somente depois que Orland, usando ratos "germ-free" mantidos com uma dieta cariogênica, proporcionaram evidências inequívocas que a cárie dental experimental não ocorre na ausência de microorganismo. O presente trabalho teve como objetivo o estudo da capacidade acidogênica dos microorganismos componentes da placa dental. Utilizando um meio composto de sacarose ou glicose 2,5g, NaCl 0,85g, indicador de Andrade 1 por cento e água destilada 100ml, ph 7.0 e adicionando material de placa dental a este meio, foi possível verificar aquela ocorrência em 100 indivíduos com idades variando entre 7 a 40 anos


Subject(s)
Dental Caries/diet therapy , Diet, Cariogenic , Dental Plaque/diagnosis , Dental Plaque/microbiology , Acids/analysis , Glucose/adverse effects , Sucrose/adverse effects
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