These results showed the possibility to obtain jelly from apple pomace, but consumers clearly preferred jelly prepared with apple pomace and quince since consumers appreciated the quince taste in jelly.
The quince additive did not influence the hardness and cohesiveness. We expected that quince additive which increased the total content of pectins in puree (Forni et al., 1994) and is significant for gelification, could influence the texture of jelly. As expected, the quince additive was also beneficial for taste improvement. Under the studied conditions, the heating time had no significant influence on the textural parameters or overall acceptability. In fact, this range issued from a preliminary study. It appears then that a heating time lower than 25 min resulted in a very soft jelly whereas a heating time higher than 30 min result in a jelly with burning taste.
Consequently, the optimum heating time ranges from 25 to 30 min, but within this interval, the heating time did not affect the preparation of jelly. The best test was obtained with highest quince concentration (28.5 g/100 g) and lowest sugar concentration (43 g/100 g).
Overall preference brought the best response since it gave information about the flavour and also the texture of the product. However, the textural analysis enabled us to explain some results obtained by the judges. This work showed that it was possible to upgrade the apple pomace used as a food ingredient in the production of jelly.
Further studies have to be undertaken to better understand the role of pectin and degree of methylation on hardness values. Furthermore, it would be interesting to verify the preservation of nutritional value of apple pomace (pectin, phenolic compounds) during the treatment.
These results showed the possibility to obtain jelly from apple pomace, but consumers clearly preferred jelly prepared with apple pomace and quince since consumers appreciated the quince taste in jelly.The quince additive did not influence the hardness and cohesiveness. We expected that quince additive which increased the total content of pectins in puree (Forni et al., 1994) and is significant for gelification, could influence the texture of jelly. As expected, the quince additive was also beneficial for taste improvement. Under the studied conditions, the heating time had no significant influence on the textural parameters or overall acceptability. In fact, this range issued from a preliminary study. It appears then that a heating time lower than 25 min resulted in a very soft jelly whereas a heating time higher than 30 min result in a jelly with burning taste.Consequently, the optimum heating time ranges from 25 to 30 min, but within this interval, the heating time did not affect the preparation of jelly. The best test was obtained with highest quince concentration (28.5 g/100 g) and lowest sugar concentration (43 g/100 g).Overall preference brought the best response since it gave information about the flavour and also the texture of the product. However, the textural analysis enabled us to explain some results obtained by the judges. This work showed that it was possible to upgrade the apple pomace used as a food ingredient in the production of jelly.Further studies have to be undertaken to better understand the role of pectin and degree of methylation on hardness values. Furthermore, it would be interesting to verify the preservation of nutritional value of apple pomace (pectin, phenolic compounds) during the treatment.
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