Firmness is considered as an important parameter for yogurt
texture (Fig. 3). Control had the highest firmness value during
storage. This was most likely due to a higher protein rearrangement
in the control yogurt (Prasanna, Grandison, & Charalampopoulos,
2013). The addition of POE changed the gel firmness significantly
between treatments, and a lower firmness was showed for all
supplemented yogurts. The increased softness of yogurt with POE
could be attributed to increased water in the gel system due to the
decreased syneresis. It has also been observed that the addition of
POE contributed to the increase of cohesiveness, adhesiveness and
springiness when compared with the yogurt control (Fig. 3). An
increase in adhesiveness could indicate a tendency of the LF-yogurt
with POE to become associated with the surface of the texturometer
(Magenis et al., 2006); therefore, more work is needed to
overcome the forces of attraction between yogurt surface and
texturometer probe surface. An increase in springiness, which is the ability of a sample after the deformation regains its condition, may
also be attributed to the higher amount of water in the gel, making
it softer and with a less brittle network (Fig. 2), which means that the sample has a greater capacity to regain its initial position. This is
in agreement with the results of cohesiveness, as LF-yogurts made
with POE showed higher values of cohesiveness (greater strength of
internal bonds).
Firmness is considered as an important parameter for yogurttexture (Fig. 3). Control had the highest firmness value duringstorage. This was most likely due to a higher protein rearrangementin the control yogurt (Prasanna, Grandison, & Charalampopoulos,2013). The addition of POE changed the gel firmness significantlybetween treatments, and a lower firmness was showed for allsupplemented yogurts. The increased softness of yogurt with POEcould be attributed to increased water in the gel system due to thedecreased syneresis. It has also been observed that the addition ofPOE contributed to the increase of cohesiveness, adhesiveness andspringiness when compared with the yogurt control (Fig. 3). Anincrease in adhesiveness could indicate a tendency of the LF-yogurtwith POE to become associated with the surface of the texturometer(Magenis et al., 2006); therefore, more work is needed toovercome the forces of attraction between yogurt surface andtexturometer probe surface. An increase in springiness, which is the ability of a sample after the deformation regains its condition, mayalso be attributed to the higher amount of water in the gel, makingit softer and with a less brittle network (Fig. 2), which means that the sample has a greater capacity to regain its initial position. This isin agreement with the results of cohesiveness, as LF-yogurts madewith POE showed higher values of cohesiveness (greater strength ofinternal bonds).
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