Optimasi Proporsi Rosella Terhadap Kualitas Dan Kelayakan Finansial Crackers Rosella

Abstract

The purpose of this research is to find optimal conditions for total antosianin, antioxidant activity and cracking strength with the treatment of Rosella’s proportion; wheat flour, duration of fermentation, roasting temperature and view financial feasibility for home industry. This research is designed with a Central Composite Design-response Surface Method consisting of three (3) factors i.e. the proportion of Rosella: flour (X1) (10%: 90%; 20%: 80%; 30%: 70%); duration of fermentation (X2) (30, 45, and 60 minutes); and the temperature of roasting (X3) (140oC, 160oC, and180oC.). In order to analyze the effect of simultaneous influence of proportion of Rosella: wheat flour, long fermentation, and the temperature of roasting to total antioxidant activity and Anthocyanins content, crack strength; data are analyzed using ANOVA using the software, Design Expert DX 7.1.6 (trial version) by observing the significance in probability and reliability models. The final analysis is regarding the financial feasibility of the product (Rosella cracker) for home industry. The ANOVA result indicates that the treatment of Rosella’s proportion: wheat flour, duration of fermentation, temperature of roasting, simultaneously have no significant effect to the total yield of Anthocyanins, antioxidant activity, and cracking strength. Individually, the proportion of Rosella: wheat flour and roasting temperature have significant effect to the total yield of Anthocyanins and real antioxidant activity. Meanwhile, the duration of fermentation and temperature of roasting have very significant to the cracking strength. Based on the analysis results of optimal solution, we can obtain the optimal treatment on the proportion of Rosella: wheat flour amount 26.28 : 73.72 (%); duration of fermentation 30,92 minutes; temperature of roasting 144,90 oC with the value for optimum response Anthocyanins 41,3933 ppm, total antioxidant activity 55,9126%, and cracking strength broken 1504,21 N/m. Manufacturing of crackers Rosella in home industry is financially feasible, the breakeven point will be reached on the subject of sales volume 28.031,55 units or worth Rp. 109.260.852,-.