showed the dry weights of pectin after first and second extraction under different extraction conditions. It could be seen that the weight of pectin obtained after the first extraction using UAHE was lower than that of CHE. This was because ultrasound disintegrated the material, adversely affecting the separation of liquid and solid phases (Xu et al., 2014). It was
noted that researchers had investigated the effects of temperature and time of UAHE on pectin yield, reporting that the pectin yield of UAHE was lower than that of CHE (Bagherian et al., 2011), which was contradictory with other studies (Panchev et al., 1988, 1994; Xu et al., 2014). Overlooking the pectin absorbed in the residue would probably lead to the improper conclusion.
Considering this disadvantage, the second extraction was necessary in order to obtain the dissolved pectin completely. Through the second extraction with hot distilled water, little pectin was recovered from the residue after CHE, while about 40–50% of Pectin I (pectin obtained by the first extraction) was recovered from the residue after UAHE. The total weight of pectin extracted by UAHE was significantly higher than that by CHE (p < 0.05).
showed the dry weights of pectin after first and second extraction under different extraction conditions. It could be seen that the weight of pectin obtained after the first extraction using UAHE was lower than that of CHE. This was because ultrasound disintegrated the material, adversely affecting the separation of liquid and solid phases (Xu et al., 2014). It wasnoted that researchers had investigated the effects of temperature and time of UAHE on pectin yield, reporting that the pectin yield of UAHE was lower than that of CHE (Bagherian et al., 2011), which was contradictory with other studies (Panchev et al., 1988, 1994; Xu et al., 2014). Overlooking the pectin absorbed in the residue would probably lead to the improper conclusion.Considering this disadvantage, the second extraction was necessary in order to obtain the dissolved pectin completely. Through the second extraction with hot distilled water, little pectin was recovered from the residue after CHE, while about 40–50% of Pectin I (pectin obtained by the first extraction) was recovered from the residue after UAHE. The total weight of pectin extracted by UAHE was significantly higher than that by CHE (p < 0.05).
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