3.5. Pasting properties and thermal properties of noodle during steaming.
The RVA test is widely used for evaluating changes in viscosity of cereal flours or starches during heating and cooling. In general pasting properties are related to the swelling and rupture of starch granules in a system (Hormdok & Noomhorm, 2007) Table 2 shows pasting properties of noodles steamed for different periods of time. The results revealed that the peak viscosity and breakdown viscosity of steamed noodles were significantly (P< 0.05) lower than those of non-steam-treated noodles, which was clearly attributed to the restricted swelling capacity. The pasting temperature was higher than that of non-steam-treated noodles. In addition, with an increase in steaming time the peak viscosity and breakdown viscosity decreased, whereas the pasting temperature increased for control noodles and remained nearly constant for other noodles. It is reported that decreased swelling and hydration of starch granules would reduce the pasting viscosity (Guler et al., 2002). Many researchers had reported the effect of heating on increase or decrease in paste viscosities. Hormdok and Noomhorm (2007) found that rice flour with annealed and heat-moisture treatment exhibited a reduction in peak viscosity. Liu, Corke, and Ramsden(2000) also reported that the reduction in peak viscosity and breakdown viscosity was apparently for maize starch treated with autoclave. However, this was not consistent to the observation by Hoover and Vasanthan (1994) in their study oven heating, And they reported the increased paste viscosities in wheat starch. It is somed heating, froze concluded that in wheat starch. It can be concluded thatin heating treatment affected paste viscosities some way and these depended on disparity in starch sources. Ackn methods and heating conditions. Furthermore, peak viscosity of noodle was obviously decreased by Naci, but was clearly increased by Nazco3, which was attributed to the starch-salt interaction. Generally, the effect of salts on pasting property of starch was dependent on the type and concentration of salt, and starch sources dation (Zhou, Wang, Li, Fang. & Sun, 2011). Thus, salt and alkaline salt Refere might cause starch granules to swell to various degree before control resulting lower or higher peak viscosity. Compared with AAcc (2 and white salted noodles, yellow alkaline noodles Mini decreased more slowly in the breakdown viscosity during steaming , suggesting a slower loss of starch granule integrity.
3.5 การวางคุณสมบัติและคุณสมบัติความร้อนของก๋วยเตี๋ยวระหว่างนึ่ง The RVA test is widely used for evaluating changes in viscosity of cereal flours or starches during heating and cooling. In general pasting properties are related to the swelling and rupture of starch granules in a system (Hormdok & Noomhorm, 2007) Table 2 shows pasting properties of noodles steamed for different periods of time. The results revealed that the peak viscosity and breakdown viscosity of steamed noodles were significantly (P< 0.05) lower than those of non-steam-treated noodles, which was clearly attributed to the restricted swelling capacity. The pasting temperature was higher than that of non-steam-treated noodles. In addition, with an increase in steaming time the peak viscosity and breakdown viscosity decreased, whereas the pasting temperature increased for control noodles and remained nearly constant for other noodles. It is reported that decreased swelling and hydration of starch granules would reduce the pasting viscosity (Guler et al., 2002). Many researchers had reported the effect of heating on increase or decrease in paste viscosities. Hormdok and Noomhorm (2007) found that rice flour with annealed and heat-moisture treatment exhibited a reduction in peak viscosity. Liu, Corke, and Ramsden(2000) also reported that the reduction in peak viscosity and breakdown viscosity was apparently for maize starch treated with autoclave. However, this was not consistent to the observation by Hoover and Vasanthan (1994) in their study oven heating, And they reported the increased paste viscosities in wheat starch. It is somed heating, froze concluded that in wheat starch. It can be concluded thatin heating treatment affected paste viscosities some way and these depended on disparity in starch sources. Ackn methods and heating conditions. Furthermore, peak viscosity of noodle was obviously decreased by Naci, but was clearly increased by Nazco3, which was attributed to the starch-salt interaction. Generally, the effect of salts on pasting property of starch was dependent on the type and concentration of salt, and starch sources dation (Zhou, Wang, Li, Fang. & Sun, 2011). Thus, salt and alkaline salt Refere might cause starch granules to swell to various degree before control resulting lower or higher peak viscosity. Compared with AAcc (2 and white salted noodles, yellow alkaline noodles Mini decreased more slowly in the breakdown viscosity during steaming , suggesting a slower loss of starch granule integrity.
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