57 research outputs found
Study of phenolic and volatile composition of white wine during fermentation and a short time of storage
The phenolic composition including hydroxybenzoic acids, hydroxycinnamic acids and flavan-3-ols was identified and quantified in all studied samples by using a reversed-phase high-performance liquid chromatography (HPLC) system coupled with diode array detection. Gallic, protocatechuic, p-coumaric and vanillic acids were the major phenolic substances in grape juice, whereas caffeic acid was the most abundant phenolic acid in the wine after a short time of storage. For more reliable results, the antioxidant activity of grape juice and wine was measured by β-carotene bleaching (BCB) and 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging methods.The content changes of volatile compounds in the grape juice and wine were determined by using headspace solid phase microextraction (HS-SPME) coupled with gas chromatography (GC/FID and GC/MS). Hexanal, (E)-2-hexenal, 2-ethyl-1-hexanol, 1-hexanol, (Z)-neroloxide and linalool were the most representative compounds determined in grape juice, whereas ethyl esters of hexanoic, octanoic, decanoic and dodecanoic acids, hexyl acetate, isoamyl acetate, as well as isobutanol, isoamyl alcohol and 1-hexanol were identified as the main compounds.
Isolation of white wine volatiles using different sample preparation methods
Three sample preparation methods for gas chromatographic analysis of white wine volatiles were tested. In order to find an adequate replacement for common liquidliquid extraction using 1,1,1-trichlorofluoromethan, headspace solid-phase microextraction (HS-SPME) and stir bar sorptive extraction (SBSE) were tested. SPME and SBSE sample preparations are characterized by rapid and easy handling, small sample size and the possibility of automation, but the recovery of aroma compounds is restricted because of the discrimination properties of the polymer phase. Unlike SPME, the results obtained by SBSE are more similar to those of liquid-liquid extraction.
Prevalence of pain among college music students and faculty
Previous studies have demonstrated significant performance-related pain among professional musicians. No large-scale studies involving musicians at colleges have been performed. Determine prevalence and anatomic locations of pain among college music students and faculty. Learn what those musicians do when they get pain
Sources of Information about Dietary Fibre: A Cross-Country Survey
Dietary fibre (DF) has been recognized as a major determinant for improvement of health. Hence the means of information through which people become aware of its benefits are crucial. This work aimed at studying the sources of information about DF, as a means to educate people about aspects related to healthy eating. Factors such as gender, level of education, living environment or country were evaluated as to their effect on the selection of sources and preferences. For this, a descriptive cross-sectional study by means of a questionnaire, applied to a non-probabilistic sample of 6010 participants from 10 countries in different continents (Europe, Africa and America), answered after informed consent by all participants. For the analysis were used several descriptive statistics tools, crosstabs and chi square test to assess the relations between some of the variables under study. The results showed that mostly the information about DF comes from the internet, but the participants recognize that television might be a most suitable way to disseminate information about DF. The results also indicated differences between genders, levels of education, living environments and countries. The internet, the preferred source of information, got highest scores for Hungary, for urban areas, for university level of education and for female gender. The radio, the least scored source of information, was preferred in Egypt, for men and with lower education (primary school). As a conclusion, people get information through the internet due to easy access. However, it is to some extent a risk given the impossibility to control de information made public on the internet. The role of health centers and hospitals as well as schools should definitely be increased, as a responsible way to ensure correct information
Comparison of the ingestion of fibre rich foods in different countries
Introduction: The ingestion of fruits, vegetables and cereals, especially whole grain, is associated
with a healthy lifestyle and has been recognized as having multiple health benefits, associated,
among others, to the ingestion of adequate amounts of dietary fibre.
Objective: The aim of this work was to evaluate some eating habits related to fibre rich foods in
six different countries: Argentina, Croatia, Hungary, Latvia, Portugal and Romania.
Methods: A cross-sectional descriptive study was carried out by means of questionnaire survey
applied to a sample of 4905 participants, all over the age of 18 years old. The preparation and
application of the questionnaire followed the necessary ethical guidelines and the treatment
was made by SPSS.
Results: The results showed that for the global sample was observed a low ingestion of salads
and vegetables (78.2%), being this particularly problematic for Croatia (86.6%). Regarding the
consumption of fruits, for the whole sample the great majority also showed a low consumption
(92.3%), and for Latvian participants the percentage is very much expressive (98.3%). As for the
consumption of whole cereals, most participants also showed a low consumption, either for the
global sample (72.6%) or in the different countries, and particularly for Latvia (90.0%). Some
eating habits were also studied and it was observed that for the whole sample 71.9% showed a
low frequency of meals ate out of home, while 88.6% revealed acceptable frequency of eating
fast food, i.e, only once or twice a week. Conclusions: The results indicated that in the countries at study the ingestion of foods rich in
dietary fibre is very low, and therefore it is necessary to implement strategies to increase the
consumption of such foods.info:eu-repo/semantics/publishedVersio
Level of information about dietary fibre: a study involving 10 Countries
Introduction: Dietary fibre (DF) is recognized as healthy for long, so that health claims are
allowed by the European Food Safety Authority (EFSA) due to its proved benefits, extended but
not only confined to many diseases of the gastrointestinal tract.
Objective: This work intended to analyse the level of information about DF in 10 countries,
situated in Europe, Africa and South America.
Methods: A descriptive cross-sectional study was undertaken through a survey based on a
questionnaire of self-response applied to a sample of 6010 participants. The data were lately
treated by factor and cluster analyses, including validation methodologies.
Results: Factor analysis showed that ten of the twelve items used to assess the knowledge about
DF could be arranged into two factors: one related to health effects (α =0.854) and the other to
the sources (α =0.644). Furthermore, cluster analysis showed that the participants could be
divided into three groups: 1) Good knowledge about sources and health effects of DF; 2) Good
knowledge about the sources of DF but poor knowledge about the health effects; 3) Poor
knowledge about the sources and health effects of DF. Conclusions: The results clearly allowed identifying two factors and three clusters, and the
variables that most influenced cluster membership were country, living environment and level
of education.info:eu-repo/semantics/publishedVersio
Polifenóis totais e flavonoides em amostras de chá verde (Camellia sinensis L.) de diferentes marcas comercializadas na cidade de Salvador-BA
Determination of phenolic compounds and antioxidant activity of green, black and white teas of Camellia sinensis (L.) Kuntze, Theaceae
Foam-Mat Freeze-Drying of Blueberry Juice by Using Trehalose-β-Lactoglobulin and Trehalose-Bovine Serum Albumin as Matrices
This study aimed to evaluate the effect of pure protein compounds and trehalose incorporated into blueberry juice for foam-mat freeze-drying on the foam and powder properties. Foam-mat freeze-drying (FMFD) of blueberry juice was tested at − 55 °C for 24 h. Matrices used were trehalose + β-lactoglobulin (T3BL1) and trehalose + bovine serum albumin (T3A1) and compared with maltodextrin + whey protein isolate (M3W1). Physicochemical properties of foam and powder, e.g., foam stability, foam density, moisture, rehydration time, color, particle morphology, total phenolic, and anthocyanins (total and individuals), were investigated. T3BL1 and T3A1 had more stable foam than M3W1. However, overrun of T3BL1 and T3A1 foamed were inferior to the M3W1 sample. The M3W1 sample recovered 79% powder (dry weight) and was superior to others. Rehydration time of powdered T3BL1 and T3A1, with bulk densities of 0.55–0.60 g cm−3, was the fastest (34–36 s). The blueberry powders of M3W1 showed more irregular particle size and shape, while the samples with trehalose and pure proteins generated particles of more uniform size with obvious pores. T3BL1 and T3A1 showed less redness (a*) values than the M3W1 product. All samples were considered pure red due to hue values < 90. M3W1 was superior in total phenolic content (TPC) and total monomeric anthocyanins (TMA) compared with both samples made with trehalose + β-lactoglobulin and trehalose+bovine serum albumin. Delphinidin-3-glucoside (Del3Gl) concentration was found to be higher in M3W1. Also, M3W1 had higher cyanidin-3-glucoside (Cyn3Gl) and malvidin-3-glucoside (Mal3Gl) concentration. M3W1 also prevented the degradation of these bioactive compounds better than the other FMFD samples. The use of pure proteins and trehalose as matrices in the FMFD process had little advantage compared with maltodextrin/whey protein isolate. Thus, maltodextrin/whey protein isolate seems an ideal matrix for the manufacture of FMFD blueberry
Influence of shooting period and extraction conditions on bioactive compounds in Turkish green tea
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