Analysis of drying kinetic of brewer ́s spent grains: effect of the temperature on the physical properties and the content of bioactive compounds / Análisis de la cinética de secado del bagazo residual de malta: efecto de la temperatura sobre las propiedades físicas y el contenido de compuestos bioactivos

Background: Brewer ́s spent grain (BSG) is a biomass by-product generated in large volumes during industrial beer production. BSG has become a growing environmental problem, as most breweries discard it inappropriately, negatively impacting the environment. Alternatives for the exploitation of this by-product have consisted of elaborating food supplements for farm animals, obtaining biofuels, developing adsorbents, and obtaining substances for the food industry. However, the high moisture content in BSG (approximately 70%), poses a significant challenge in exploring various reuse alternatives. Therefore, the implementation of a pre-drying process becomes essential. Objective: This study aimed to analyze the BSG drying kinetics at different temperatures and the effect of the drying temperature on the physical properties and the content of bioactive compounds. Methods: BSG samples were dried at different temperatures (50, 60, 70, 80, 90, and 105°C) and analyzed for their moisture ratio, water activity, total polyphenol content (TPC), and DPPH (1,1-diphenyl-2-picrylhydrazil) radical scavenging activity. Also, four kinetics models were fitted to the drying data. Results:It was determined that the effective diffusivity was between 5.23x10

Antecedentes: El Bagazo residual de malta (BSG por sus siglas en inglés) es un subproducto biomásico generado en grandes volúmenes durante la producción industrial de cerveza. El BSG se ha convertido en un creciente problema para el medio ambiente, debido a que la mayoría de las cervecerías descartan inapropiadamente este residuo generando un impacto negativo al ambiente. Las alternativas para el aprovechamiento de este subproducto han consistido especialmente en la elaboración de suplementos alimenticios para animales de granja, obtención de biocombustibles, desarrollo de adsorbentes y obtención de productos para la industria alimentaria. Sin embargo, el alto contenido de humedad (~70%) del BSG representa un reto para el desarrollo de diferentes alternativas de reutilización, por lo que se hace necesario un proceso de secado previo. Objetivos: En este estudio se analizó la cinética de secado del BSG a diferentes temperaturas y el efecto de la temperatura de secado sobre sus propiedades físicas y contenido de compuestos bioactivos. Métodos: Las muestras de BSG fueron secadas a diferentes temperaturas (50, 60, 70, 80, 90 y 105°C) y analizadas en términos de razón de humedad, actividad acuosa, contenido de polifenoles totales (TPC) y actividad secuestradora del radical DPPH. Además, se ajustaron 4 modelos cinéticos a los datos de secado. Resultados: Se determinó que la difusividad efectiva del BSG varió entre 5.23x10

Effects of some peruvian non-distilled alcoholic beverages on dental erosion / Efecto de algunas bebidas alcohólicas peruanas no destiladas sobre la erosión dental

Objective: To determine the erosive effect of pieces of permanent teeth exposed to non-distilled alcoholic beverages. Material and Methods: This study takes a quantitative approach, with an explanatory scope, descriptive and correlational, with a pure experimental design. The sample consisted of 45 premolar permanent teeth, which were randomly allocated to five sample groups. Every sample group was submerged in dark beer Cuzqueña Negra, wheat beer Cuzqueña de Trigo, lager beer Cerveza Cristal, lager beer Pilsen Callao and physiological saline solution; every solution had a quantity of 110 mL. The experiment was performed for five minutes, with three repetitions every 12 hours over a period of 70 days. The sampling was performed every seven days, using an analytical scale and a data sheet. Results: The average weight loss of dental pieces put in dark beer Cuzqueña Negra (pH 4.0) was 239.4456 mg. In lager beer Pilsen Callao (pH 4.6), it was 146.7867 mg. In lager beer Cerveza Cristal (pH 3.7), it was 131.3567 mg. In wheat beer Cuzqueña de Trigo (pH 4.5), it was 121.7122 mg. Lastly, in physiological saline solution (pH 6.8), it was 14.3311 mg. When applied to the sample, the statistical test Student's t-test resulted in a value of p≈0.000 (p<0.05). Conclusion: Non-distilled alcoholic beverages caused erosive effects in the pieces of permanent teeth.

Objetivo: : Determinar el efecto erosivo en dientes permanentes expuestos a bebidas alcohólicas no destiladas. Material y Métodos: Este estudio tiene un enfoque cuantitativo, con alcance explicativo, descriptivo y correlacional, con un diseño puramente experimental. La muestra consistió en 45 dientes permanentes premolares, que fueron asignados aleatoriamente a cinco grupos de muestra. Cada grupo de muestra se sumergió en cerveza Cuzqueña Negra, cerveza Cuzqueña de Trigo, Cerveza Cristal, cerveza Pilsen Callao y solución salina fisiológica; cada solución tenía una cantidad de 110 mL. El experimento se realizó durante cinco minutos, con tres repeticiones cada 12 horas durante un período de 70 días. El muestreo se realizó cada siete días, utilizando una escala analítica y una hoja de datos. Resultados: La pérdida de peso promedio de las piezas dentales colocadas en cerveza negra Cuzqueña Negra (pH 4,0) fue de 239,4456 mg. En la cerveza Pilsen Callao (pH 4,6), fue de 146,7867 mg. En la cerveza Cerveza Cristal (pH 3,7) fue de 131,3567 mg. En cerveza Cuzqueña de Trigo (pH 4,5), fue de 121,7122 mg. Por último, en suero fisiológico (pH 6,8) fue de 14,3311 mg. Cuando se aplicó la prueba estadística t de Student a la muestra dio como resultado un valor de p?0,000 (p<0,05). Conclusion: Las bebidas alcohólicas no destiladas causaron efectos erosivos en dientes permanentes.

Effect of RIM21 gene disruption on flocculation of lager yeast / 生物工程学报

Lager yeast is the most popular yeast strain used for beer production in China. The flocculation of yeast plays an important role in cell separation at the end of fermentation. Therefore, appropriately enhancing the flocculation capability of the lager yeast without affecting its fermentation performance would be desirable for beer industry. Our previous study showed that the defect of gene RIM21 might contribute to the enhanced flocculation capability of a lager yeast G03. To further investigate the role of the RIM21 gene in flocculation of strain G03, this study constructed a RIM21-deleted mutant strain G03-RIM21Δ through homologous recombination. Deletion of RIM21 improved the flocculation capability of strain G03 during wort fermentation at 11 °C without changing its fermentation performance significantly. The expression of FLO5, Lg-FLO1 and some other genes involved in cell wall integrity pathway were up-regulated in strain G03-RIM21Δ. In addition, the disruption of RIM21 enhanced resistance of yeast cells to cell wall inhibitors. These results provide a basis for elucidating the flocculation mechanism of lager yeast under low-temperature fermentation conditions.

Transformation of Brewery Subproducts into Valuable Biomass Using Mixotrophic Culture of Chlorella pyrenoidosa and Associated Bacteria

Abstract To develop a biorefinery concept applied in the brewery industry, Chlorella pyrenoidosa and a consortium of associated bacteria were cultivated mixotrophically in a continuous photobioreactor using brewery low-value subproducts as an integrative process. Beer production residues were biochemically characterized to assess the most promising options to be used as a nutrient source for microalgal cultivation. Due to its physical and chemical properties, pre-treated weak wort was used to prepare an organic complex culture medium for microalgal biotransformation. Filtration and nitrogen supplementation were necessary to improve nutrient removal and biomass productivity. Maximal removal of nitrate and phosphate obtained were 90% and 100% respectively. Depending on operation conditions, total carbohydrates depuration ranged from 50 - 80%. The initial concentration of total carbohydrates of the weak wort must be adjusted to 2 - 4g/L to maintain a stable equilibrium between microalgal and bacterial growth. The biochemical composition of produced biomass varied depending on the cultivation conditions as well as on its final use. Upon continuous mixotrophic conditions evaluated in this study, C. pyrenoidosa was composed mainly of carbohydrates and protein.

Investigation of the Erosive Potential of Different Types of Alcoholic Beverages

Abstract Objective: To evaluate the erosive potential of different alcoholic beverages according to pH, titratable acidity and buffering capacity. Material and Methods: Thirteen industrialized alcoholic beverages of different brands were selected and divided into five groups according to their type and composition. The pH measurement and titratable acidity for pH 5.5 and 7.0 were performed in triplicate in 50 mL of each beverage. The buffering capacity was calculated based on pH and titratable acidity for pH 7.0. ANOVA, Tukey, and Pearson correlation, with p<0.05, were used for data analysis. Results: Data showed normal distribution by Shapiro-Wilk test. The pH of alcoholic beverages ranged from 2.49 (Miks Ice Tea - Green Fruits) to 7.64 (Smirnoff). The highest values of acid titration (4.68) and buffer capacity (19.97) were observed in Smirnoff Ice. The following correlations (p<0.01) were noted between: pH and titratable acidity; buffering capacity and pH; buffering capacity and titratable acidity. Conclusion: Some beers and alcopops presented erosive potential due to their lower pH associated with high acid titration values. The whisky and sugarcane liquor examined were not potentially erosive.

Clinical and Laboratory Findings of Barley Allergy in Korean Children: a Single Hospital Based Retrospective Study

Análise de contaminação por microorganismos em latas de cerveja comercializadas na cidade de Sorocaba-SP / Analysis of contamination by microorganisms in beer cans marketed in the city of Sorocaba -SP

Objetivo ­ Determinar a presença de microrganismos na lata de cerveja, coletando amostras de três diferentes grupos de comerciantes, divididos em: G1 ­ Vendedores ambulantes, G2 ­ Bares e G3 ­ Supermercados do município de Sorocaba/SP, totalizando 33 amostras com e sem selo de proteção. Métodos ­ Foram realizadas a inoculação de todas as amostras em meios de cultura apropriados, analisando o nível de crescimento de cada uma e utilizando das provas bioquímicas especificas para identificação do microrganismo. Resultados ­ Das 30 amostras, excluídas as 3 amostras controle, apenas 5 sem o selo de proteção foram positivas, sendo que em três delas houve crescimento de bactérias Gram negativas e em duas houve o crescimento de bactérias Gram positivas. Conclusão ­ Com os resultados obtidos, foi possível concluir que a utilização do selo de proteção e a higienização anterior ao consumo são eficazes para evitar a contaminação bacteriana, pois em nenhuma dessas amostras houve crescimento de microrganismos

Objective ­ To determine the presence of microorganisms in the beer can, collecting samples from three different groups of markets, divided into: G1 - Street vendors, G2 - Bars and G3 - Supermarkets in the city of Sorocaba / SP, totaling 33 samples with and without protective seal. Methods ­ All samples were inoculated in appropriate culture media, analyzing the growth level of each one and using the specific biochemical tests to identify the microorganism. Results ­ Of the 30 samples, excluding the 3 control samples, only 5 without the protective seal were positive, in three of them there was growth of Gram negative bacteria and in two there was growth of Gram positive bacteria. Conclusion ­ With the results obtained, it was possible to conclude that the use of the protective seal and the cleaning prior to consumption are effective to avoid bacterial contamination, since in none of these samples there was growth of microorganisms

O produtor de cerveja caseira em Belo Horizonte: características do grupo e interfaces / The homebrewer in Belo Horizonte: group features and links with leisure studies

A produção de cerveja caseira é um fenômeno social que pode ser empiricamente observado e associado ao campo de Estudos do Lazer. Este texto apresenta e avança em relação aos resultados parciais da tese de doutorado intitulada "Da panela ao copo: a produção de cerveja como prática de lazer", e abordou aspectos sobre um grupo de cervejeiros caseiros de Belo Horizonte ­ MG e as interfaces desta prática com o lazer. Como estudo qualitativo com características etnográficas, foram realizadas entrevistas semiestruturadas, acompanhamento de brassagens e produção de cerveja em casa por um dos autores, com registro em diário de campo. Observou-se que os cervejeiros compõem um grupo social, majoritariamente masculino, culturalmente próximo, inserido no mercado de trabalho e que possuem em comum as variáveis tempo, espaço e dinheiro para vivenciar seu lazer.

Craft brewering is a social phenomenon that can be empirically observed and associated with the Leisure Studies. This paper presents and goes through to partial results of a doctoral thesis named "From the pot until the glass: brewering as leisure practice" and deal with aspects of a group of craft brewers in Belo Horizonte, city in Minas Gerais state, Brazil, such as the relationship of that practice with leisure. As a qualitative study with ethnographic characteristic, interviews has been made, participation in brewering sessions and craft brewering at home made by one of the authors, registered in a field journal. The brewers can be seen as a social group, mainly males, with a cultural approach, inserted in labor world and with common characteristics free time, space and financial resources for leisure living.

Aceitação sensorial de cervejas de diferentes marcas comerciais / Sensory acceptance of beers of different trademarks

A cerveja é uma bebida de ampla produção e consumo no mundo, conhecida desde os tempos remotos em diversos países. O presente trabalho teve como objetivo avaliar a aceitação sensorial de cervejas de duas marcas comercializadas na cidade de Imperatriz - MA. A análise sensorial foi conduzida com 60 julgadores não treinados, consumidores de cervejas. Para isso, foram utilizadas as escalas hedônica, do ideal e de intenção de compra. Para os dados de escala hedônica, todos os atributos encontraram-se na região de aceitação da escala, se localizando entre as categorias “gostei ligeiramente” e gostei muitíssimo”. Contudo, a marca B foi mais aceita, em virtude da melhor aparência apresentada. A marca A teve menor aceitação da cor, resultante da menor intensidade desse atributo.

Análise físico-química de cervejas artesanais comercializadas em Guaratinguetá-SP / Physical-chemical analysis of artisan beverages marketed in Guaratinguetá-SP

A cerveja é a bebida alcoólica mais consumida no mundo, sendo que as artesanais têm ampliado sua participação no mercado. Este trabalho objetivou caracterizar físico-quimicamente e agrupar cervejas artesanais de diferentes estilos encontradas no comércio da cidade de Guaratinguetá-SP. Foram analisadas 5 cervejas artesanais denominadas de A, B, C, D e E, em duplicata. A acidez total variou de 28,42 a 42,63 mEq/L, o teor de sólidos solúveis de 4,8 a 8,0 °Brix e o teor alcoólico de 5,90 a 9,25 % (v/v), sendo que todas as amostras apresentaram valores superiores ao descrito no rótulo. O valor médio do pH foi de 4,55 e a cor oscilou de 12,67 a 38,77 EBC. Pelas análises exploratórias PCA e HCA observou-se que os estilos Weissbier e Irish Red Ale apresentaram uma menor distinção entre os parâmetros físico-químicos analisados.

Análise físico-química de cervejas comerciais sem glúten / Gluten free commercial beer physical-chemical analysis

A determinação de importantes parâmetros de qualidade de cervejas foram realizados em duas cervejas comerciais sem glúten (A e B). Para a análise, as amostras foram degaseificadas em sonicador Desruptor de Célula Ultra-Sônico (UNIQUE) para posterior aferição de parâmetros físico-químicos. As análises foram realizadas em equipamento Anton Paar Beer analyzer do Instituto Federal do Rio de Janeiro. Ao final, seus resultados foram comparados com trabalhos da literatura com outras duas cervejas com glúten (C e D) em mesmo tipo de aparelho. Foram encontrados em média valores para as cervejas sem glúten inferiores a 26% para o álcool (%p/p), 8% para extrato real (%p/p), 22% para extrato original (%p/p) e 20% para grau real de fermentação (RDF %).

Análise microbiológica da superfície de latas de cerveja: a importância do processo de higienização antes do consumo / Microbiological analysis of beer can: the importance of sanitation before consumption

A produção de bebidas enlatadas segue normas para controle sanitário, porém não é possível estimar as condições higiênicas dessas latas quando chegam ao consumidor. O objetivo do presente trabalho foi analisar externamente latas de cerveja sem selo de proteção, coletadas em prateleiras de supermercado, à temperatura ambiente, quanto à contagem microbiana. As latas foram coletadas, aleatoriamente, em prateleiras de supermercados de Juiz de Fora, MG, à temperatura ambiente e foram submetidas à contagem de micro-organismos aeróbios mesófilos pelo método do esfregaço de suabe. Os resultados demonstraram que as latas testadas sem higienização prévia apresentaram contagem microbiana elevada e que processos de higienização simples, como a lavagem somente com água, podem reduzir consideravelmente a quantidade de micro-organismos na embalagem. A população deve ser esclarecida e instruída a realizar o processo de higienização das latas antes do consumo.

Construction of industrial brewing yeast for fermentation under high temperature and high gravity condition / 生物工程学报

As a new beer fermentation technology, high temperature and high gravity fermentation has brought many benefits to brewery industry, but there are also a series of problems such as the decrease of yeast flocculation ability at the end of fermentation and the high concentration of higher alcohols. To increase yeast flocculation ability and reduce the production of higher alcohols in high temperature and high gravity fermentation of beer, BAT2 was replaced by the FLO5 expression cassette to obtain the mutant strain S6-BF2. Real-time quantitative PCR showed that the relative transcriptional level of FLO5 in S6-BF2 improved 17.8 times compared with that in S6. The flocculation ability of mutant S6-BF2 heightened by 63% compared to that of the original strain S6, and the concentration of higher alcohols decreased from 175.58 mg/L to 159.58 mg/L in high temperature and high gravity fermentation of beer. Moreover, the activity of mitochondrial branched-chain amino acid transferase was repressed, resulting in the production of higher alcohols of 142.13 mg/L, reduced by 18.4% compared to that of the original strain S6, meanwhile, the flocculation ability of mutant S6-BF2B1 kept unchanged compared to the mutant S6-BF2. The determination result of flavor compounds showed that the higher alcohols/ester ratio in beer was reasonable. This research has suggested an effective strategy for enhancing yeast flocculation ability and decreasing production of higher alcohols in high-temperature and high-gravity brewing.

The food and nutrient intakes from daily processed food in Korean adults: based on the 6(th) Korea National Health and Nutrition Examination Survey data (2013 ~ 2015) / 한국영양학회지

PURPOSE: The consumption of processed foods has recently been increasing due to changes in the living environment. The purpose of this study was to identify the contribution of processed food to the nutrient intake of adult Koreans. METHODS: A total of 15,760 adult people in the 6(th) National Health and Nutrition Examination Survey (2013 ~ 2015) were included in this study. According to the Korea Food and Drug Administration's classification criteria for processed foods, the 24 hour dietary recall data of the subjects were classified as processed food or natural food. The processed food intake, nutrient intake and major processed food sources by food groups were analyzed. RESULTS: Men consumed more processed foods than did the women. Consumption of processed foods decreased with age, but it increased with the education level and the income level. The total daily processed food intake accounted for 68.1% of the total food intake. The food groups with high processed food intake were beverage, vegetables, cereals and grain products, fruits, and milk and dairy products in this order. The top food source of each food groups were beer, kimchi, bread, processed apple products, and milk. After adjusting for age, gender, and energy intake, all the nutrient intakes and percentage of dietary reference intakes for Koreans, except carbohydrates, were significantly higher in processed foods than in natural foods. The sodium intake from the processed food was 96.3% of total daily sodium intake. The intakes of nutrients from processed foods, excluding vitamins C, dietary fiber, iron, and vitamin A, were higher in men than in women. The intake of sodium from processed foods was highest for people of 30 ~ 49 years of age, and the intake of sodium from processed foods decreased for people over 50. CONCLUSION: Korean adults consumed more processed food than the natural food, consuming more calories and most of the nutrients from the processed food overall total daily intakes. The intake of processed foods is expected to further increase in the future, and nutritional education and research on the ingestion and selection of healthy processed foods are necessary.

Regulations of RLM1 gene affect the anti-autolytic ability of lager yeast / 生物工程学报

The autolysis of brewer's yeast seriously affects the quality of beer and the quality of yeast is considered as one of the key factors in beer brewing. Previous studies on brewer's yeast autolysis showed that RLM1 gene, an important transcription factor in cell integrity pathway, is closely related to the autolysis of yeast. In this study, RLM1 was knocked out and overexpressed in a haploid brewer's yeast. RLM1 disruption resulted in poor anti-autolysis performance of yeast, whereas overexpression of RLM1 contributed to the anti-autolytic ability of yeast. In addition, RLM1 gene knockout affected the osmotic stress resistance, cell wall damage resistance, nitrogen starvation resistance and temperature tolerance of yeast strain. The transcriptional level of GAS1 involved in cell wall assembly and DNA damage response was regulated along with the expression of RLM1, whereas other genes in CWI pathway did not show apparent regularity. RLM1 might mainly affect the expression of GAS1 so as to improve the stress resistance of lager yeast in harsh environment. The result from this study help further understand the mechanism of yeast autolysis and lay a foundation for breeding brewer's yeast strain with better anti-autolytic ability.

Nicotinamide riboside regulates inflammation and mitochondrial markers in AML12 hepatocytes

BACKGROUND/OBJECTIVES: The NAD+ precursor nicotinamide riboside (NR) is a type of vitamin B3 found in cow's milk and yeast-containing food products such as beer. Recent studies suggested that NR prevents hearing loss, high-fat diet-induced obesity, Alzheimer's disease, and mitochondrial myopathy. The objective of this study was to investigate the effects of NR on inflammation and mitochondrial biogenesis in AML12 mouse hepatocytes. MATERIALS/METHODS: A subset of hepatocytes was treated with palmitic acid (PA; 250 µM) for 48 h to induce hepatocyte steatosis. The hepatocytes were treated with NR (10 µM and 10 mM) for 24 h with and without PA. The cell viability and the levels of sirtuins, inflammatory markers, and mitochondrial markers were analyzed. RESULTS: Cytotoxicity of NR was examined by PrestoBlue assay. Exposure to NR had no effect on cell viability or morphology. Gene expression of sirtuin 1 (Sirt1) and Sirt3 was significantly upregulated by NR in PA-treated hepatocytes. However, Sirt1 activities were increased in hepatocytes treated with low-dose NR. Hepatic pro-inflammatory markers including tumor necrosis factor-alpha and interleukin-6 were decreased in NR-treated cells. NR upregulated anti-inflammatory molecule adiponectin, and, tended to down-regulate hepatokine fetuin-A in PA-treated hepatocytes, suggesting its inverse regulation on these cytokines. NR increased levels of mitochondrial markers including peroxisome proliferator-activated receptor γ coactivator-1α, carnitine palmitoyltransferase 1, uncoupling protein 2, transcription factor A, mitochondrial and mitochondrial DNA in PA-treated hepatocytes. CONCLUSIONS: These data demonstrated that NR attenuated hepatic inflammation and increased levels of mitochondrial markers in hepatocytes.

Saccharomyces cerevisiae populations and other yeasts associated with indigenous beers (chicha) of Ecuador

ABSTRACT Chicha, a type of beer made mainly with maize or cassava, is a traditional fermented beverage of the Andean region. There have only been a few studies on yeasts associated with chicha fermentation, and the species diversity occurring during the production of this beverage is not known. The objective of this study was to determine the biodiversity of yeasts in chicha, and to characterize the Saccharomyces cerevisiae populations associated with the production of chicha de jora, seven-grain chicha, chicha de yuca, and chicha de morocho in Ecuador. The molecular diversity of S. cerevisiae populations was determined by restriction polymorphism mitochondrial profiles. The beverages were characterized based on their physicochemical parameters. Twenty-six species were identified, and the most prevalent species were S. cerevisiae and Torulaspora delbrueckii. Other yeast species were isolated at low frequencies. Among 121 isolates of S. cerevisiae, 68 different mtDNA molecular profiles were identified. These results showed that chichas are fermented by a high number of different strains of S. cerevisiae. Some other species provided a minor contribution to the fermentation process. The chicha presented generally similar physicochemical parameters to those observed for other traditional fermented beverages, and can be considered as an acid fermented beverage.

Perfil de consumo de cervejas e vinhos em Salvador, BA / Profile of beer and wine consumption in Salvador, BA

Diante do grande consumo de bebidas alcoólicas no Brasil e no mundo, muitas empresas têm investido na confecção de embalagens cada vez mais promissoras. Com o objetivo de conhecer o perfil de consumo de cervejas e vinhos relacionado às suas respectivas embalagens, foi desenvolvida uma pesquisa na cidade de Salvador-BA, sendo entrevistadas 221 pessoas cujo consumo das bebidas estava intrinsecamente ligado ao ambiente social. A prevalência de consumo é das cervejas com cerca de 26,7%, sendo que os principais locais de dispêndio com a mesma são festas e bares. Vale salientar que a embalagem escolhida por 93,3% dos participantes é a de vidro. Observa-se então um crescimento favorável das indústrias cervejeiras no Brasil com a comercialização deste produto popular em detrimento do vinho, possuinte de um estilo mais elitizado e restrito de consumo.

Due to the large consumption of alcoholic beverages in Brazil and in the world, many companies have made investments to increase the design of its packaging. In order to discover the relation in between the consumption of beers, wine and its packages, a research has been developed in Salvador (BA). Therefore, 221 people were interviewed, concluding that the beverage choice was intrinsically related to the social environment. Furthermore, this study highlights the predominance of beers in front of wines consumption. This scientific enquire points the development of beers industries in Brazil, but also spotlight the decrease of wine consumption due to its elitist stigma.

Influence of beverage type and ingestion time on tooth corrosion / 대한치과재료학회지

This study was conducted to analyze the effects of beverages on tooth corrosion by selecting drinks that are enjoyed by modern people. Drinks were selected for carbonated beverages (Coca Cola), energy drinks (Red Bull), orange juice, beer (Hite) and water (Evian). Bovine tooth was immersed for 1 hour, 24 hours and 48 hours. The root mean square (RMS) values were obtained by scanning the bovine tooth at pre-immersion and immersion time after impression making. Two-way ANOVA, one-way ANOVA, and Tukey-test were used to compare differences between groups (α=0.05). The RMS value tended to increase with longer immersion times in all beverages, and there was a significant difference (p < 0.05) between before immersion-1hr and before immersion-48 hr. The mean of RMS according to the type of beverage was significantly different and there was a significant difference according to the change of immersion time (p < 0.05). In order to prevent tooth corrosion, it is necessary to change the method of ingestion or to reduce the time of ingestion.

Development of a propidium monoazide-polymerase chain reaction assay for detection of viable Lactobacillus brevis in beer

ABSTRACT The spoilage of beer by bacteria is of great concern to the brewer as this can lead to turbidity and abnormal flavors. The polymerase chain reaction (PCR) method for detection of beer-spoilage bacteria is highly specific and provides results much faster than traditional microbiology techniques. However, one of the drawbacks is the inability to differentiate between live and dead cells. In this paper, the combination of propidium monoazide (PMA) pretreatment and conventional PCR had been described. The established PMA-PCR identified beer spoilage Lactobacillus brevis based not on their identity, but on the presence of horA gene which we show to be highly correlated with the ability of beer spoilage LAB to grow in beer. The results suggested that the use of 30 µg/mL or less of PMA did not inhibit the PCR amplification of DNA derived from viable L. brevis cells. The minimum amount of PMA to completely inhibit the PCR amplification of DNA derived from dead L. brevis cells was 2.0 µg/mL. The detection limit of PMA-PCR assay described here was found to be 10 colony forming units (CFU)/reaction for the horA gene. Moreover, the horA-specific PMA-PCR assays were subjected to 18 reference isolates, representing 100% specificity with no false positive amplification observed. Overall the use of horA-specific PMA-PCR allows for a substantial reduction in the time required for detection of potential beer spoilage L. brevis and efficiently differentiates between viable and nonviable cells.