Development, optimization, sensory profiling, modeling, and storage behavior on chocolate peanut spread
Chu, Christine April
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Chocolate peanut spread (CPS) was developed using a constrained mixture design whereby peanut, chocolate and sugar were adjusted to 100% of the mixture. A processing variable, roast, was included and peanuts were roasted to three levels. Response surface methodology (RSM) was used and combinations of 29-65% peanut, 9-41% chocolate, and 17- 36% sugar, adding up to 100% at a medium roast were determined as optimum formulations. RSM was used to profile and characterize formulations of CPS. Relations between descriptive, consumer acceptance, instrumental texture/physicochemical and mixture/processing variables were determined using PLSR2. Formulations high in peanut, chocolate or sugar did not drive overall acceptability, especially high sugar formulations. Accelerated shelf-life testing was conducted at 30, 35 and 40°C and effects of time and temperature were studied. Q10 of roasted peanutty, peanut butter and overall acceptability were determined as 1.64, 1.56 and 1.67, respectively. Predicted shelf-life of CPS at 23°C is approximately 2 years.