scholarly journals MELHORIA NA EFICIÊNCIA DA CLARIFICAÇÃO DE SUCO DE MARACUJÁ PELA COMBINAÇÃO DOS PROCESSOS DE MICROFILTRAÇÃO E ENZIMÁTICO

Author(s):  
BRENO DE PAULA ◽  
INGRID V.M. MORAES ◽  
CAROLINA C. CASTILHO ◽  
FLÁVIA DOS SANTOS GOMES ◽  
VIRGÍNIA MARTINS DA MATTA ◽  
...  

Este trabalho teve como objetivo a obtenção de suco clarificado de maracujá, utilizando a técnica de microfiltração. Introduziu-se a etapa de tratamento enzimático antes da microfiltração, visando aumentar a eficiência do processo pela redução da viscosidade e do teor de polpa do suco. Foram testadas três diferentes enzimas hidrolíticas em três níveis de concentração. Os resultados não mostraram diferenças significativas quanto ao Brix, pH e acidez das amostras de suco hidrolisado em relação ao suco integral. Observou-se efeito positivo da ação das enzimas na redução da viscosidade e do teor de polpa. A microfiltração foi realizada em sistema de membrana tubular com tamanho médio de poro equivalente a 0,3 µm e pressão transmembrana de 1,5 bar. O suco permeado apresentou-se límpido, isento de polpa e com qualidade e sanidade microbiológica. Tais resultados comprovaram a eficiência da microfiltração para clarificação e estabilização de sucos de frutas. IMPROVEMENT IN THE EFFICIENCY OF PASSION FRUIT JUICE CLARIFICATION BY THE COMBINATION OF MICROFILTRATION AND ENZYMATIC PROCESSES Abstract This work had as objective the obtention of clarified passion fruit juice by using the microfiltration technique. A step of enzymatic treatment was introduced before microfiltration, aiming to enhance process efficiency by reduction of viscosity and pulp content of the juice. Three different hidrolytic enzymes were tested in three concentration levels. The results didn’t demonstrate significant differences in Brix, pH and acidity of the hidrolyzed juice samples in relation to the concentrated juice. Positive effect was observed in the action of the enzymes in the reduction of viscosity and pulp content. The microfiltration was realized in a tubular membrane system with average size of the pore equivalent to 0.3 m and transmembrane pressure of 1.5 bar. The permeate juice was clear, free from pulp and with good micribiological quality. Such results proved the efficiency of microfiltration for clarification and stabilization of fruit juices.

2014 ◽  
Vol 651-653 ◽  
pp. 211-214 ◽  
Author(s):  
Zeng Xin Li ◽  
Xu Yi Zhou ◽  
Zhong He Tian ◽  
Hong Li ◽  
Sa Sa Wang

The clarify fruit juice has the characteristics of clear bright and current commercially available in the beverage industry and international trade market. Chitosan clarification method has the compatibility, complete degradation and degradation metabolites of low toxicity and good biological and is widely used in juice production in the fruit and vegetable clarification. Some research shows that factors affecting the results of juice clarification are chitosan dosage, temperature, time, solution of pH, the molecular weight of chitosan solution viscosity size.Chitosan used in fruit juice processing could clarify fruit juice, but also had the characteristics of gel in the juice stored, and could maintain the original freshness of fruit juice. Bentonite, zeolite, maifan stone,such as the load with chitosan applied to fruit juice clarification, the amount of random factors difficulty to control can be avoided. Caroxymethyl chitosan used in blackberry juice processing the content of protein, polyphenol in juice reduced more than the chitosan treatment.It was good to prevent turbidity during storage or secondary precipitation.


2011 ◽  
Vol 28 (6) ◽  
pp. 746-755 ◽  
Author(s):  
Saurabh Sudha Dhiman ◽  
Gaurav Garg ◽  
Jitender Sharma ◽  
Ritu Mahajan

2016 ◽  
Vol 196 ◽  
pp. 1272-1278 ◽  
Author(s):  
Vincenzo Lettera ◽  
Cinzia Pezzella ◽  
Paola Cicatiello ◽  
Alessandra Piscitelli ◽  
Valerio Guido Giacobelli ◽  
...  

Author(s):  
B. Meena ◽  
V.G. Sowmeya ◽  
Archa B. Praveen ◽  
A. Swetha ◽  
D. Naga Sarath Chandra ◽  
...  

This study aimed to identify and characterize a pectinase-producing novel yeast from the fermented juice of Phyllanthus emblica and apply the enzyme for fruit juice clarification. Among the five pectinase-producing yeasts, isolate-1 exhibited the highest pectinase activity and was further used in this study. Based on morphological, physiological, and 18SrRNAanalyses, isolate-1 was recognized as a new strain sharing 99% sequence homology with other Meyerozyma strains and was thus designated as Meyerozyma sp. VITPCT75. The strain produced pectinase optimally at a temperature and pH of 25oC and 7, respectively. Maximum pectinase production was observed after 4-days incubation. The enzyme exhibited optimum activity at the temperature of 25 °C and pH 7.0. The enzyme was more stable at a temperature and pH of 20 °C and 7, respectively. Storage stability studies revealed that the enzyme was stable at -20 °C. The cell-free supernatant was partially purified using ammonium sulfate and solvent precipitation. Acetone at a concentration of 20% assured an adequate partial purification. The molecular weight of pectinase was determined as 6 kDa. The enzymatic metal ion preference-related studies revealed that Ca²z, Kz, Cu²z, Fe²z, and Ba²z ions enhanced, Ni²z ions moderately inhibited, and Mn²z ions intensely inhibited the enzymatic activity. Neither Na+ and Mg2+ ions nor EDTA affected the enzyme activity. When subjected to fruit juice clarification, the enzyme significantly reduced the viscosity of the juice.


2004 ◽  
Vol 88 (2) ◽  
pp. 209-217 ◽  
Author(s):  
N. Ortega ◽  
S. de Diego ◽  
M. Perez-Mateos ◽  
M.D. Busto

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