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<p>This research focused on developing functional tarhana soup samples with a lower estimated glycemic index (GI) that are high in resistant starch and β-glucan, and rich in plant-based protein. Tarhana samples were produced by supplementing with hull-less barley and lentil flours and resistant starch obtained from high-amylose wheat. The color, microbial loads, phenolic contents, antioxidant capacity, and GI values of the tarhana samples were evaluated. RS content increased up to 13.82% in the samples treated with autoclaving cycles, while protein reached 20.75% in lentil-supplemented tarhana, enabling several formulations to be classified as “high in protein” according to EU regulations. Barley addition enhanced β-glucan levels to 3.09%. Significant increases were also observed in bioactive compounds of tarhana samples supplemented with resistant starch/barley/lentil flours. The results indicate that high-amylose wheat, barley, and lentils might be used as ingredients in traditional tarhana to obtain products with better functional and nutritional properties.</p>

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Formulation of a fermented soup with enhanced nutritional quality: higher resistant starch and protein contents and a reduced glycemic index

  • 期刊论文

  • 发表日期：

    2026年5月27日

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  • Kubra Ozkan,
  • Gizem Ince,
  • Ghizlane Salih,
  • Samuela Palombieri,
  • Francesco Sestili,
  • Andrea Visioni,
  • Hamit Koksel,
  • Osman Sagdic

摘要

This research focused on developing functional tarhana soup samples with a lower estimated glycemic index (GI) that are high in resistant starch and β-glucan, and rich in plant-based protein. Tarhana samples were produced by supplementing with hull-less barley and lentil flours and resistant starch obtained from high-amylose wheat. The color, microbial loads, phenolic contents, antioxidant capacity, and GI values of the tarhana samples were evaluated. RS content increased up to 13.82% in the samples treated with autoclaving cycles, while protein reached 20.75% in lentil-supplemented tarhana, enabling several formulations to be classified as “high in protein” according to EU regulations. Barley addition enhanced β-glucan levels to 3.09%. Significant increases were also observed in bioactive compounds of tarhana samples supplemented with resistant starch/barley/lentil flours. The results indicate that high-amylose wheat, barley, and lentils might be used as ingredients in traditional tarhana to obtain products with better functional and nutritional properties.