نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه علوم و صنایع غذایی، واحد شهرکرد، دانشگاه آزاد اسلامی، شهرکرد، ایران

2 گروه علوم و صنایع غذایی، دانشکده کشاورزی، دانشگاه آزاد اسلامی، واحد شهرکرد، شهرکرد، ایران

3 استادیار،‌ گروه علوم وصنایع غذایی، دانشگاه آزاد اسلامی، واحد شهرکرد، شهرکرد، ‌ایران

4 گروه علوم و صنایع غذایی، دانشگاه آزاد اصفهان (خوراسگان)

چکیده

          شکلات ‌تلخ سوسپانسیونی از ساکارز، پودر کاکائو و ذرات غیرچرب است که در فاز پیوسته‌‌ای از کره کاکائو پراکنده شده­اند. در سال‌‌های اخیر گرایش مصرف‌کنندگان به مصرف محصولات کم­کالری با مقدار قند کمتر به دلیل ارتقای سلامتی مورد توجه قرار گرفته است. در این پژوهش، اثر شیرین‌‌کننده‌‌های حجمی مختلف مانند ایزومالت، اینولین و سوربیتول در فرمولاسیون شکلات تلخ به عنوان جایگزین شکر بر ویژگی­های رئولوژیکی، رفتارهای ذوب‌‌شوندگی و ویژگی­های  حسی شکلات تلخ مقایسه و ارزیابی شد. نمونه‌‌ها تحت تجزیه و تحلیل‌‌های رئولوژیکی پایا و نوسانی، پارامترهای ذوب‌‌شوندگی مانند دمای ابتدایی ذوب، دمای پیک، آنتالپی و دمای انتهایی ذوب و همچنین  تجزیه و تحلیل حسی با استفاده از روش هدونیک 5 نقطه‌‌ای قرار گرفتند. نتایج بررسی­ها نشان دادند استفاده از انواع مختلف پرکننده‌‌های حجمی تأثیر معنی‌‌داری بر ویژگی‌‌های رئولوژیکی و حسی شکلات تلخ دارد، به‌‌طوری که ایزومالت سبب افزایش و اینولین و سوربیتول سبب کاهش ویسکوزیته ظاهری نمونه‌‌ها شده­اند. جایگزین کردن شکر با سوربیتول سبب افزایش رفتار ژل‌‌مانند شد در حالی که ایزومالت و اینولین خاصیت ویسکوز نمونه‌‌ها را افزایش دادند. شیرین‌‌کننده‌‌های حجمی سبب تغییر در دمای ذوب اولیه، آنتالپی و کاهش دمای پیک ذوب شکلات تلخ شدند. ارزیابی حسی نشان داد که نمونه‌‌های حاوی سوربیتول پایین‌‌ترین و نمونه‌‌های حاوی ساکارز بیشترین امتیاز مربوط به پذیرش کلی را دارند. شیرین‌‌کننده‌‌های حجمی تأثیرات مختلفی بر ویژگی‌‌های حسی و رئولوژیکی شکلات تلخ داشتند از این‌‌رو استفاده از مخلوطی از این ترکیبات به­منظور دستیابی به فرمولاسیون بهینه و مشابه با نمونه تجاری آن توصیه می‌شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

The Effect of Substituting Sugar With Isomalt, Inulin and Sorbitol on the Physical and Sensory Properties of Dark Chocolate

نویسندگان [English]

  • seyed vahid loghmani 1
  • hooman molavi 3
  • mohammad fazel 4

1 Food Science and Technology department, Shahrekord branch, Islamic Azad University, Shahrekord, Iran

3 food science and technology department shahrekord branch Islamic azad university

4 Department of Agriculture and Food Technology, Khorasgan Branch, Islamic Azad University, Isfahan

چکیده [English]

In recent years, there has been tendency among consumers to use low-calorie products with lower sugar content to promote their health. In this study, the effects of various bulk sweeteners such as isomalt, inulin and sorbitol in the formulation of dark chocolate as a sugar substitute on the rheological properties, melting behaviors and sensory properties of dark chocolate were compared and evaluated. The samples were subjected to steady and dynamic rheological analyses; melting parameters such as initial melting temperature, peak temperature, enthalpy and final melting temperature, as well as sensory analysis, were investigated using a 5-point hedonic method. The use of different types of bulk sweeteners had a significant effect on the rheological and sensory properties of dark chocolate; so, isomalt increased, while inulin and sorbitol decreased the apparent viscosity of the samples. Substituting sugar with sorbitol increased the gel-like behavior, while isomalt and inulin increased the viscous behavior of the samples. Bulk sweeteners also caused changes in the initial melting temperature and enthalpy, as well as decreasing the peak melting temperature of dark chocolate. Sensory evaluation also showed that the samples containing sorbitol had the lowest and those having sucrose had the highest score related to the total acceptance. Bulk sweeteners had different effects on the sensory and rheological properties of dark chocolate; so, the use of a mixture of these compounds to achieve an optimal formulation similar to that of the commercial sample is recommended.
 

کلیدواژه‌ها [English]

  • Sensory evaluation
  • Melting behavior
  • Rheology
  • Dark chocolate
  • Volumetric sweeteners
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