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1.
Food Chem ; 345: 128772, 2021 May 30.
Article in English | MEDLINE | ID: mdl-33310255

ABSTRACT

We developed a whey protein admixture of turmeric extract by spray drying (TWPC-SD) and by foam mat drying (TWPC-FMD) and compared its bioactive compounds and nutrients contents. TWPC samples were evaluated for preference and acceptability. Vitamins and carotenoids were determined by high-performance liquid chromatography. Total phenolics, curcumin and antioxidant capacity were determined by spectrophotometry. Centesimal composition was performed according to the Association of Official Analytical Chemists. Chemical elements were determined by inductively coupled plasma optical emission spectrometry. TWPC containing 3.6 mg of curcumin showed good acceptability. Carotenoids and riboflavin were not detected in either TWPC. Vitamin C content was maintained, and antioxidant capacity was increased in both products (p < 0.05). TWPC-SD showed higher total phenolic and curcumin contents compared to TWPC-FMD (p < 0.05). Thus, the TWPC-SD is a good alternative for human consumption since it showed good sensory acceptability and its nutrients and bioactive compounds can contribute to human health.


Subject(s)
Complex Mixtures/chemistry , Curcuma/chemistry , Nutrients/analysis , Plant Extracts/chemistry , Whey Proteins/chemistry , Antioxidants/analysis , Ascorbic Acid/analysis , Carotenoids/analysis , Chromatography, High Pressure Liquid , Desiccation , Humans , Phenols/analysis , Spray Drying , Vitamins/analysis
2.
Semina Ci. agr. ; 30(3): 613-618, 2009.
Article in Portuguese | VETINDEX | ID: vti-471693

ABSTRACT

The modern life has increased the demand for fresh-cut fruits and vegetables, which maintain closer characteristics to in natura, beyond the convenience and be ready-to-use. The effect of active packages in the browning inhibition of fresh-cut potatoes was estimate. 30 micra cellulosic films with ascorbic + citric acid addition (2, 3 e 5% each one), sodium metabisulphite (0,3 ; 0,5 e 1%) and the control (without anti-browning agent). The control treatment with film (without agent) and without film presented increase on pH after storage from 5,7 to 6,7 while potatoes with AA + AC antioxidants addition demonstrated a little decrease to 5,5. Potatoes treatments with AA + AC antioxidants in the films maintained the initial color by all storage period, while potatoes with sodium metabisulphite in the films exhibited a strong browning. This effect for the films with antioxidants addition happened because the decrease on pH, below the optimum point for enzyme activity, improving to reduce the relative enzyme activity lower to 50%, considering then the film with antioxidants addition being more effective to control the enzymatic browning, acting on polyphenoloxidase inhibition.    


A vida moderna tem aumentado a demanda por frutas e hortaliças minimamente processadas, que mantêm características próximas ao in natura, além da praticidade e conveniência. Foi avaliado o efeito de embalagens ativas na inibição do escurecimento de batatas fatiadas minimamente processadas. Filmes de base celulósica, com 30 micras de espessura, foram incorporados com a mistura ácido ascórbico + ácido cítrico (2, 3 e 5% de cada), antioxidante metabissulfito de sódio (0,3 ; 0,5 e 1,%) e o controle (sem agente anti-escurecimento). As amostras de batatas envolvidas em filme (sem agente) e sem filme apresentaram aumento de pH de 5,7 para 6,7 após armazenamento, enquanto batatas envolvidas em filmes com adição de compostos químicos apresentaram diminuição de pH para 5,5. Os filmes incorporados com as misturas de AC e AA mantiveram a coloração inicial da batata durante o período de estocagem, enquanto que os filmes contendo metabissulfito de sódio apresentaram escurecimento intenso das batatas. Este efeito para os filmes com adição de antioxidantes ocorreu em razão da diminuição do pH, abaixo do ponto ótimo de atividade desta enzima, conseguindo reduzir a atividade relativa da enzima à menos de 50%, considerando o filme com adição de antioxidantes sendo mais efetivo no controle do escurecimento enzimático, agindo na inibição da enzima polifenoloxidase.   

3.
Semina ciênc. agrar ; 30(3): 613-618, 2009.
Article in Portuguese | LILACS-Express | VETINDEX | ID: biblio-1498478

ABSTRACT

The modern life has increased the demand for fresh-cut fruits and vegetables, which maintain closer characteristics to in natura, beyond the convenience and be ready-to-use. The effect of active packages in the browning inhibition of fresh-cut potatoes was estimate. 30 micra cellulosic films with ascorbic + citric acid addition (2, 3 e 5% each one), sodium metabisulphite (0,3 ; 0,5 e 1%) and the control (without anti-browning agent). The control treatment with film (without agent) and without film presented increase on pH after storage from 5,7 to 6,7 while potatoes with AA + AC antioxidants addition demonstrated a little decrease to 5,5. Potatoes treatments with AA + AC antioxidants in the films maintained the initial color by all storage period, while potatoes with sodium metabisulphite in the films exhibited a strong browning. This effect for the films with antioxidants addition happened because the decrease on pH, below the optimum point for enzyme activity, improving to reduce the relative enzyme activity lower to 50%, considering then the film with antioxidants addition being more effective to control the enzymatic browning, acting on polyphenoloxidase inhibition.


A vida moderna tem aumentado a demanda por frutas e hortaliças minimamente processadas, que mantêm características próximas ao in natura, além da praticidade e conveniência. Foi avaliado o efeito de embalagens ativas na inibição do escurecimento de batatas fatiadas minimamente processadas. Filmes de base celulósica, com 30 micras de espessura, foram incorporados com a mistura ácido ascórbico + ácido cítrico (2, 3 e 5% de cada), antioxidante metabissulfito de sódio (0,3 ; 0,5 e 1,%) e o controle (sem agente anti-escurecimento). As amostras de batatas envolvidas em filme (sem agente) e sem filme apresentaram aumento de pH de 5,7 para 6,7 após armazenamento, enquanto batatas envolvidas em filmes com adição de compostos químicos apresentaram diminuição de pH para 5,5. Os filmes incorporados com as misturas de AC e AA mantiveram a coloração inicial da batata durante o período de estocagem, enquanto que os filmes contendo metabissulfito de sódio apresentaram escurecimento intenso das batatas. Este efeito para os filmes com adição de antioxidantes ocorreu em razão da diminuição do pH, abaixo do ponto ótimo de atividade desta enzima, conseguindo reduzir a atividade relativa da enzima à menos de 50%, considerando o filme com adição de antioxidantes sendo mais efetivo no controle do escurecimento enzimático, agindo na inibição da enzima polifenoloxidase.

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