scholarly journals Physical, Chemical-physical and chemical characterization of must and integral juice in grape cultivars

2017 ◽  
Vol 10 (3) ◽  
pp. 1 ◽  
Author(s):  
I. T. S. Viana ◽  
G. V. A. Fonseca ◽  
G. H. Bueno ◽  
J. O. F. Melo

In recent years there has been an important increase in the production of grape derivatives such as integral grape juice. Thus, it was intended with the accomplishment of this study to evaluate the composition of the grape juice of the grape cultivars: Bordô, Concord e Isabel in the composition of integral grape juice from the Bento Gonçalves-RS. The samples were evaluated for classical analysis:°Brix, pH, titratable acidity, ratio Brix / titratable acidity made through methods, physics, physical chemistry and chemistry. The mineral elements sodium and potassium analyzed by flame emission and color intensity by colorimetry. For the statistical analysis of the data, the Tukey test was applied at the 5% level of significance. The contents of integral grape juice evaluated, SS, A Tand minerals presented according to the legislation, the pH was within the comparative average with other works. The determination of the color demonstrated the need to make cuts.

2020 ◽  
Vol 13 (7) ◽  
pp. 39
Author(s):  
J. L. C. Souza ◽  
L. B. Silva ◽  
R. X. Costa ◽  
M. C. Vieira

The objective of this work was to evaluate the physical and chemical characteristics of fruits of different matrices of mama-cadela and araçá. Physical evaluations were: longitudinal fruit diameter (DLF), fruit cross diameter (DTF), fruit mass (MF), longitudinal seed diameter (DLS), seed transverse diameter (DTS) and seed mass (MS) . Chemical analyzes consisted of analyzing pH, titratable acidity, humidity and ashes. The results of the physical and chemical analyzes were subjected to analysis of variance (ANOVA) and the Scoott-Knott test (p <0.05). The mean values of DLF; DTF; MF; DLS; DTS; MS; pH; titratable acidity; moisture and ash of the bitch-breast fruits were: 2.18 cm; 1.95 cm; 4.34 g; 1.73 cm; 1.40 cm; 1.57 g; 4.97; 0.49%; 66.31% and 32.50%. The fruits of araçá presented average values of longitudinal, transverse diameter, fruit mass, pH and titratable acidity: 2.58 cm; 2.03 cm; 6.39 g; 3.44; and 0.94%. The results showed variability among the mama-cadela breeds regarding chemical and physical evaluations; and no differences were observed between the araçá matrices in the physical variables..


Author(s):  
Maria José Silveira da Silva ◽  
Ana Paula Trindade Rocha ◽  
Dyego da Costa Santos ◽  
Alfredina Dos Santos Araújo ◽  
Marcela Nobre de Oliveira

<p>Objetivou-se<strong> </strong>caracterizar blend<em> </em>de abacaxi com acerola liofilizado quanto à composição físico-química. O estudo foi conduzido no Laboratório de Armazenamento e Processamento de Produtos Agrícolas da Universidade Federal de Campina Grande, Campina Grande, Paraíba. As polpas foram homogeneizadas em liquidificador durante 1 min e filtrado em peneira com malha de 2,5 mm, as amostras foram liofilizadas em liofilizador de bancada (Terroni, LS 3000), onde foi desidratada na temperatura de -50 °C por 76 h. A amostra in natura e a liofilizada foram submetidas às analises físico-químicas. Onde foi obtido um teor de água de 92% da amostra in natura e, após o processo de liofilização houve uma redução de 70%. A atividade de água (a<sub>w</sub>) foi inferior a 0,30 após a desidratação. Observou-se que houve um amento significativo nos teores de sólidos totais, acidez total titulável e sólidos solúveis totais. No tocante a relação SST/ATT houve um decréscimo de 8,37% e, com relação ao pH não houve diferença significativa entre a amostra in natura e a liofilizada. Com relação aos parâmetros de cor observou-se que houve um aumento de 33,91% para luminosidade e para intensidade de vermelho (+a*) de 3%, no entanto para a intensidade de vermelho (+a*) houve uma redução de 9,27% após a liofilização. O processo de secagem por liofilização concentrou as características físicas e químicas das amostras avaliadas, sendo considerado um método eficiente para redução da atividade de água e para conservação dos alimentos.</p><pre><strong><em>Physical-chemical characterization of pineapple blend with acerola obtained by the lyophilization method</em></strong></pre><p><strong>Abstract</strong><strong>: </strong>The objective of this work was to characterize the blend of pineapple and lyophilized acerola as regards the physicochemical composition. The study was conducted at the Laboratory of Storage and Processing of Agricultural Products of the Federal University of Campina Grande, Campina Grande, PB. The pulps were homogenized in a blender for 1 min and screened with a 2.5 mm mesh, the samples were lyophilized in a bench freeze dryer (Terroni, LS 3000), where it was dehydrated at -50 ° C for 76 h. The in natura and lyophilized samples were submitted to physico-chemical analysis. Where a water content of 92% of the sample was obtained in natura and after the lyophilization process there was a reduction of 70%. Water activity (aw) was less than 0.30 after dehydration. It was observed that there was a significant increase in the contents of total solids, total titratable acidity and total soluble solids. Regarding the SST / ATT ratio, there was a decrease of 8.37% and, regarding pH, there was no significant difference between the in natura and lyophilized samples. Regarding the color parameters, it was observed that there was an increase of 33.91% for luminosity and for red intensity (+ a *) of 3%, however for the intensity of red (+ a *) there was a reduction of 9.27% after lyophilization. It was concluded that the drying process by lyophilization concentrated the physical and chemical characteristics of the evaluated samples, being considered an efficient method to reduce water activity and to preserve food.</p>


2021 ◽  
Vol 322 ◽  
pp. 04001
Author(s):  
Ernawati ◽  
Moh. Awaludin Adam ◽  
Irawati Mei Widiastuti ◽  
Era Insivitawati

Product diversification is needed to increase selling and marketing prices. One of them is the African catfish sausage product. Liquid smoke has been used commercially by the food industry. This study aimed to determine the physical and chemical properties of smoked African catfish after adding different concentrations of liquid smoke and immersion duration. The chemical analysis measured the levels of protein, fat, and phenol. The results showed that sausage with a concentration of 20% liquid and soaking for 30 minutes was the best treatment with a protein content of 43.8 ± 0.34%, a fat of 12.33 ± 0.61%, and phenol 292.74 ppm. Determination of the compound using GC-MS found that the most dominant compound in the smokeless sausage was 2-hexanone, 3,3 dimethyl with a relative concentration of 32.42%. The dominant compound in the besttreated sausage was Furan, tetrahydro-2,2-dimethyl- with a relative concentration of 19%. Liquid smoke penetration is clearly visible in the microstructure of smoked sausages, both in the best-treated smoked sausages and commercial sausages. Scanning Electron Microscope (SEM) magnification of 2.500x shows that the best emulsified smoked sausages have a flatter structure, smaller droplets, and are more refined than smokeless sausages or commercial smoked sausages.


2006 ◽  
Vol 28 (2) ◽  
pp. 325-327 ◽  
Author(s):  
Ítalo Herbert Lucena Cavalcante ◽  
Natanael de Jesus ◽  
Antonio Baldo Geraldo Martins

The work had as objective the physico-chemical characterization of yellow mangosteen fruits. Six samples of 25 fruits were harvested in yellow mangosteen plants of the Active Germoplasm Bank of São Paulo State University and characterized by evaluation of length and width, weight, percentage and number of seeds per fruit, peel and pulp percentage, soluble solid (SS), titratable acidity (TA), vitamin C and SS/TA rate. Yellow mangosteen fruit is an intermediate vitamin C source with an average content 120.33 mg/100g of fresh fruit and has good technological quality.


1969 ◽  
Vol 244 (15) ◽  
pp. 4128-4135
Author(s):  
R T Acton ◽  
J C Bennett ◽  
E E Evans ◽  
R E Schrohenloher

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