کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
604382 880305 2012 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of alkalis on konjac glucomannan gels for use as potential gelling agents in restructured seafood products
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Effect of alkalis on konjac glucomannan gels for use as potential gelling agents in restructured seafood products
چکیده انگلیسی

Four dispersions of 3% glucomannan in water, deacetylated with 5% 0.6 N and 1 N KOH (lots L1 and L2) and 0.6 N and 1 N NaOH (lots L3 and L4) as gelling agents, were evaluated for use in raw restructured seafood products. Several properties (pH, moisture content, water binding capacity, cooking loss and lightness) together with puncture data (breaking force and breaking deformation) were determined after 1 and 10 days of chilled storage at 5 °C. All these data were analyzed together with different viscoelastic parameters obtained at small amplitude oscillatory strain (SAOS) after 1 day of chilled storage, showing that L1 and L4 samples were the most suitable gels for incorporation in raw restructured fish products. In both cases the highest stress (σmax) and strain (γmax) amplitude values were found in the linear viscoelastic (LVE) range; however, L1 showed both high strain amplitude and breaking deformation values. Moreover, creep and recovery (transient) data showed that L1 was the most time-stable gel with the highest elasticity and the lowest relaxation exponent (n). L4 gel showed strong rigidity, i.e. the highest values of breaking force and storage moduli (G′) and the highest n value, making it less gel-like. Both L1 and L4 gels became significantly less gel-like over 10 days of chilled storage due to the loss of gel strength (S) and a noticeable increase of n. These chilled storage effects were more intense in L4 than in L1.

Figure optionsDownload as PowerPoint slideHighlights
► The type and concentration of the alkali of glucomannan gels at 3% was studied.
► Viscoelastic and mechanical properties of glucomannan gels were analyzed.
► 0.6 N KOH and 1 N NaOH were the most suitable alkalis for using as gelling agents.
► 0.6 N KOH was the most-time stable gel with the highest elasticity.
► Both gels became significantly less gel-like over 10 days of chilled storage.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Food Hydrocolloids - Volume 27, Issue 1, May 2012, Pages 145–153
نویسندگان
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