Food Technology
Mohammad Sadegh Arab; Hannan Lashkari; Mehrdad Niakosari; Mohammad Hadi Eskandari
Abstract
This study aimed to evaluate the effects of intelligent pH-sensitive composite film based on gelatin and Persian gum incorporated with purple carrot extract (PCE) on the freshness of wrapped mozzarella cheese. In this regard, the color, pH, yeast and mold count of control and treatments wrapped with ...
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This study aimed to evaluate the effects of intelligent pH-sensitive composite film based on gelatin and Persian gum incorporated with purple carrot extract (PCE) on the freshness of wrapped mozzarella cheese. In this regard, the color, pH, yeast and mold count of control and treatments wrapped with intelligent pH-sensitive composite film during 60 days were evaluated. The results showed that the pH significantly reduced in wrapped cheese with and without PCE (control) samples during storage. However, this reduction was more pronounced in the control sample (P<0.05). Additionally, the application of composite film on cheese affected the color during storage. It was observed that L* and a* values of the composite film-wrapped cheese were significantly higher than the control sample, but the b* values were significantly lower than the control sample. Moreover, poor microbial growth (yeasts and mold) was observed in cheese samples wrapped by composite film with purple carrot compared to the control. Also, the pH of the composite film with extract significantly decreased from 6.33 to 4.85 during storage (P < 0.05), which showed the changes of color from purple to pink. After 40 days, the color changed to pink, indicating the end of the cheese storage. Therefore, it was concluded that the pH-sensitive film, while being an effective method to improve the shelf life of mozzarella cheese, can also use as an indicator for freshness.
Sara Hoseinpoor; Mohammad Hadi Eskandari; Gholam Reza Mesbahi; Shahram Shekarforoush; Asgar Farahnaki
Abstract
Nitrite is responsible for some characteristics of cured meat products such as color, flavor and suppressing
the outgrowth and production of toxin from Clostridium botulinum. Despite all of its desired properties, nitrite is
responsible for the formation of carcinogenic N-nitrosamine. In this study, ...
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Nitrite is responsible for some characteristics of cured meat products such as color, flavor and suppressing
the outgrowth and production of toxin from Clostridium botulinum. Despite all of its desired properties, nitrite is
responsible for the formation of carcinogenic N-nitrosamine. In this study, nitrite-free and low-nitrite meat
curing systems were developed to eliminate or reduce nitrite from meat products. Thirteen different formulations
were made including standard frankfurter ingredients with or without nitrite in combination with cochineal and
paprika as natural coloring agents. For example, control sample was with 120 mg/kg nitrite, low-nitrite sample
was contained 40 mg/kg nitrite and some samples were without nitrite. The samples were stored at 4 oC for eight
weeks. During the storage, color changes (L*, a*, b*) were determined and evaluated. Also, the produced
samples were exposed to natural and artificial light and their color stability were compared. In addition, the
colors of samples were evaluated by trained panelists. The results showed that the sample with 40 mg/kg nitrite
and 0.002 % cochineal, the sample contained 40 mg/kg nitrite and 1 mg/kg paprika and the sample without
nitrite and contained 0.015 % cochineal had no significant different color (p
