4. Discussion
4.1. Response optimization
The jelly formulation from pectin substances is a well-known
source since pectin has been long unambiguously established as
a genuine gelling agent in diverse food formulations, notably,
preserves, jellies, and marmalades. The presented formulation of
peel jellies were developed by using the optimization plots with
fulfilling the jelly ingredients specification such as amount of
sugar and citric acid. Other than that, this optimized condition
can act as a guidance to continue to change formulation ingredients
until fit the needs for jelly propertie