The linear rheological properties of the control, 10%, and 30% blends exhibited similar viscoelastic solid behavior (Ferry, 1980), where both G0 and G00 had plateaus (G0 > G00) and there were parallel to each other over three decades of the experimental frequency.
Blends showed higher moduli values than the control. The storage or elastic moduli (G0) and the phase shifts (d) for the control were in a range of 20 to 90 Pa and 15 to 32, respectively. The elastic moduli (G0) and the phase shifts (d) for the 10% blend were in a range of 99 to 437 Pa and 15 to 31, respectively, while the 30%
blend exhibited a 212–851 Pa elastic moduli (G0) and the (d) between 11 and 23 (Fig. 3b). The G0 and the d values of the remaining blends (10%, 15%, and 25%) were in between the 20% and 30% blend (data not shown). These results indicated that blends exhibited
stronger viscoelastic solid properties than the control, suggesting that blends should have better baking quality than the control. However, the stronger viscoelastic solid-behaviour of the blends, partially caused by the fibre in the banana, may not have the same effect on the dough system and the baking process. Therefore,
blends and the control flour might have similar baking quality despite their differences in the dynamic rheology testing. This is due to the difference between the suspension system tested here and the dough system used for baking, where the solid content of the dough system is much higher than the suspension used for dynamic rheology analysis. The non-linear shear behavior of the control and the 10% as well as 30% blends showed shear-thinning behavior (Fig. 3a). The viscosity of the blends was higher than the control, whereas the viscosity of the 30% blend was highest (Fig. 3a). The remaining blends exhibited the same shear-thinning with values between the 10% and the 30% blends (data not shown), indicating that all blends
has similar viscosities but, slightly higher than the control. Because the actual industrial processing shear rates are in the range of 1 to 100 s1 (Bloksma, 1988), we could predict that, processing the control flour will require less mixing-energy than the blends due to the lower viscosities and should be easily processed. Although there were differences between the control and the blends in their rheological properties, it is reasonable to consider these differences being not substantial enough to cause changes in the final bread
quality. Especially, if we consider the nutritional benefits due to the high potassium and fibre of the blends.
คุณสมบัติ rheological เชิงเส้นของผสมควบคุม 10% และ 30% จัดแสดง viscoelastic แข็งพฤติกรรมคล้าย (เรือเฟอร์รี่ 1980), ที่ G0 และ G00 มีราบ (G0 > G00) และขนานกันกว่าสามทศวรรษของความถี่ทดลองผสมแสดงให้เห็นว่าค่า moduli สูงกว่าตัวควบคุม Moduli เก็บหรือยืดหยุ่น (G0) และกะระยะ (d) สำหรับตัวควบคุมได้ในช่วง 20 ถึง 90 Pa และ 15 ถึง 32 ตามลำดับ Moduli ยืดหยุ่น (G0) และกะระยะ (d) สำหรับผสม 10% อยู่ในช่วง 99-437 Pa และ 15 กับ 31 ตามลำดับ ในขณะ 30%ผสมผสานการจัดแสดง 212-851 Pa ยืดหยุ่น moduli (G0) และ (d) ระหว่าง 11 และ 23 (Fig. 3b) G0 และค่า d ของผสมที่เหลือ (10%, 15% และ 25%) อยู่ระหว่าง 20% และ 30% ผสม (ข้อมูลไม่แสดง) ผลลัพธ์เหล่านี้ระบุว่า ผสมจัดแสดงแข็งแกร่ง viscoelastic แข็งคุณสมบัติมากกว่าการควบคุม การแนะนำให้ ผสมควรมีเบเกอรี่คุณภาพดี กว่าตัวควบคุม อย่างไรก็ตาม แข็งแกร่ง viscoelastic ทึบพฤติกรรมของผสม บางส่วนเกิดจากเส้นใยในกล้วย อาจไม่มีผลดีกับระบบแป้งและกระบวนการอบ ดังนั้นblends and the control flour might have similar baking quality despite their differences in the dynamic rheology testing. This is due to the difference between the suspension system tested here and the dough system used for baking, where the solid content of the dough system is much higher than the suspension used for dynamic rheology analysis. The non-linear shear behavior of the control and the 10% as well as 30% blends showed shear-thinning behavior (Fig. 3a). The viscosity of the blends was higher than the control, whereas the viscosity of the 30% blend was highest (Fig. 3a). The remaining blends exhibited the same shear-thinning with values between the 10% and the 30% blends (data not shown), indicating that all blendshas similar viscosities but, slightly higher than the control. Because the actual industrial processing shear rates are in the range of 1 to 100 s1 (Bloksma, 1988), we could predict that, processing the control flour will require less mixing-energy than the blends due to the lower viscosities and should be easily processed. Although there were differences between the control and the blends in their rheological properties, it is reasonable to consider these differences being not substantial enough to cause changes in the final breadquality. Especially, if we consider the nutritional benefits due to the high potassium and fibre of the blends.
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