Therefore, cloud stabilization of fruit juices can be
achieved by increasing the fine cloud content using homogenizer
or by raising the viscosity of the surrounding solution
(Genovese and Lozano 2006; Sinchaipanit and Kerr
2007). Additionally, cloud stabilization could also be
achieved by inactivation of pectinase enzymes. Ahmad and
Bhatti (1971a) proposed that neither pasteurization nor
homogenization is effective in preventing cloud loss separately.
Ahmad and Bhatti (1971b) further reported that the
combination of pasteurization coupled with incorporation
of stabilizers such as pectin and hydrocolloid acacia
improved the stability of both juices and concentrates.
Cloud stabilizing effect could be achieved by the addition of
certain hydrocolloids such as carboxymethyl cellulose
(CMC), guar gum, sodium alginate (SA), pectin, gum acacia
and gum tragacanth (Glicksman 1982). Hydrocolloids
impart cloud stability by two mechanisms: (1) increasing
the viscosity of the juice (Chulin et al. 2006) and (2) possible
complexing of charged protein particles of the cloud
with the hydrocolloid (Yamasaki et al. 1967). The homogenous
distribution of cloud without significant clarification
of the upper part of the juice during storage is decisive for
consumer acceptability of cloudy juices (Beveridge 2002).
The importance of hydrocolloids (hydrophilic colloids), as
the name suggests, is their hydrophilic or “water loving”
properties. In colloidal suspensions, liquid absorption and
consequent swelling of the dispersed colloid result in liquid
phase thickening, thereby increasing viscosity. This thickening
or viscosity-producing effect of hydrocolloid in juices is
responsible for suspension of solid particles (Saha and
Bhattacharya 2010). The protective colloid acts as a bridge
between the continuous and dispersed phase, thereby stabilizing
the suspension (Glicksman 1969). Studies have been
conducted in the past to evaluate the effect of addition of
hydrocolloids in many juices (Corredig et al. 2001; Aggarwal
and Sandhu 2004; Qin et al. 2005), but there is scanty literature
available reporting the effect of hydrocolloids on cloud stabilization in litchi juice. Therefore, the major objectives
of this study were to evaluate the effect of addition of
hydrocolloids on cloud stability and physicochemical properties
of litchi juice during storage.
Therefore, cloud stabilization of fruit juices can beachieved by increasing the fine cloud content using homogenizeror by raising the viscosity of the surrounding solution(Genovese and Lozano 2006; Sinchaipanit and Kerr2007). Additionally, cloud stabilization could also beachieved by inactivation of pectinase enzymes. Ahmad andBhatti (1971a) proposed that neither pasteurization norhomogenization is effective in preventing cloud loss separately.Ahmad and Bhatti (1971b) further reported that thecombination of pasteurization coupled with incorporationof stabilizers such as pectin and hydrocolloid acaciaimproved the stability of both juices and concentrates.Cloud stabilizing effect could be achieved by the addition ofcertain hydrocolloids such as carboxymethyl cellulose(CMC), guar gum, sodium alginate (SA), pectin, gum acaciaand gum tragacanth (Glicksman 1982). Hydrocolloidsimpart cloud stability by two mechanisms: (1) increasingthe viscosity of the juice (Chulin et al. 2006) and (2) possiblecomplexing of charged protein particles of the cloudwith the hydrocolloid (Yamasaki et al. 1967). The homogenousdistribution of cloud without significant clarificationof the upper part of the juice during storage is decisive forconsumer acceptability of cloudy juices (Beveridge 2002).The importance of hydrocolloids (hydrophilic colloids), asthe name suggests, is their hydrophilic or “water loving”properties. In colloidal suspensions, liquid absorption andconsequent swelling of the dispersed colloid result in liquidphase thickening, thereby increasing viscosity. This thickeningor viscosity-producing effect of hydrocolloid in juices isresponsible for suspension of solid particles (Saha andBhattacharya 2010). The protective colloid acts as a bridgebetween the continuous and dispersed phase, thereby stabilizingthe suspension (Glicksman 1969). Studies have beenconducted in the past to evaluate the effect of addition ofhydrocolloids in many juices (Corredig et al. 2001; Aggarwaland Sandhu 2004; Qin et al. 2005), but there is scanty literatureavailable reporting the effect of hydrocolloids on cloud stabilization in litchi juice. Therefore, the major objectivesof this study were to evaluate the effect of addition ofhydrocolloids on cloud stability and physicochemical propertiesof litchi juice during storage.
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