Physical property and antioxidant activity of spread product from Jerusalem artichoke (Helianthus tuberosus L.) tubers

Tubers of Jerusalem artichoke ( Helianthus tuberosus L. ) or Kaentawan (Thai name) are produced worldwide and mainly cultivated in North America, Northern Europe, Australia, China as well as Thailand.  It contained high fructans (inulin and fructo-oligosaccharides), moderate protein and dietary fiber, and very low fat and sugar.  Fructans are acts as two major functions as soluble dietary fiber and prebiotic.  It has been increasingly used as a versatile ingredient in processed functional foods. This study aimed to develop Kaentawan spread product and to determine its physical properties and antioxidant activity.  The developed spread product was made from different levels of Kaentawan tubers; 100% (F1), 75% (F2), and 50% (F3). The results showed that formula F1 and F2 found significantly higher water activity (a w ) than formula F3. The higher amount of Kaentawan tuber, the lower pH value was observed. For total soluble solid content, there were significantly increased when decreased the level of added Kaentawan tuber (F1oxygen radical absorbance capacity (ORAC) assay in formula F1 showed the highest value (16.53 mmolTE/g FW) compared to formulas F2 and F3 (13.11 and 10.02 mmolTE/g FW respectively). The amount of Kaentawan in spread product of formula F3 was achieved acceptable to consumers. Thus, Kaentawan tubers had capability to be developed for the spread product and could become a commercial product.