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Journal : Jurnal AGROTEKNOLOGI

KARAKTERISTIK FISIKOKIMIA SELAI KULIT BUAH NAGA (Hylocereus polyrhizus) DENGAN PENAMBAHAN VARIASI KONSENTRASI BUAH NANAS (Ananas comosus L.) Pratiwi Jati Palupi; Retno Prasetia; Muh. Doddy Pratama; Indah Sriwahyuni
JURNAL AGROTEKNOLOGI Vol 15 No 01 (2021)
Publisher : Faculty of Agricultural Technology, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/j-agt.v15i01.20644

Abstract

Dragon fruit peels (Hylocereus polyrhizus) are generally only considered trash by the public because they are considered useless, even though dragon fruit peels still contain useful nutrients. Dragon fruit skin can be used as food, one of which is a jam. The addition of pineapple fruit variations to dragon fruit peel jam as a flavor enhancer and natural fragrance to reduce the use of sugar in jam and the aroma of pineapple fruit can mask the distinctive aroma of dragon fruit which is less desirable. The purpose of this study was to determine the appropriate concentration variations in the manufacture of dragon fruit peel jam with the addition of pineapple, which consumers liked. This study used a completely randomized design with six (6) treatments and two (2) replications. Dragon fruit peel jams analyzed by chemical tests included moisture content, sugar level, and pH, while organoleptic test included color, texture, taste, aroma, and a total of 30 untrained panelists. Observation data were processed using ANOVA (α = 5%) and further tested using the honest significant difference test (BNJ) (α = 5%). The results showed that the pineapple’s addition to dragon fruit peel jam had a very significant effect on the panelists' preference for aroma and taste, but not significantly different from the color, texture, and chemical characteristics of jam. The N6 treatment (dragon fruit peel 250 g: pineapple fruit 250 g) was the best jam, based on chemical characteristics (pH content of 3.52, moisture content of 18.65%, sugar level of 53.30%) and preferable in organoleptic characteristics (2.97 of color, 2.97 of texture, 2.97 of flavor, 3.00 of taste). Keywords: agricultural waste, dragon fruit peel, jam, pineapple
Karakteristik Seduhan Daun Pletekan (Ruellia tuberosa L.) dengan Penambahan Variasi Konsentrasi Kayu Manis Retno Prasetia; Pratiwi Jati Palupi
JURNAL AGROTEKNOLOGI Vol 17 No 01 (2023)
Publisher : Faculty of Agricultural Technology, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/j-agt.v17i01.28035

Abstract

Pletekan leaves (Ruellia tuberosa L.) used as antidiabetic (type 2) contains flavonoid (polyphenol compounds) to prevent the formation of oxidative stress because of excess amount of glucose. In the previous research, naturally brewed of pletekan leaves combined with cinnamon gave the best result in taste and gave the highest concentration of tannin and phenol than other natural flavor (bay leaves, ginger, and pandan leaves). Thus, in this research, the variation concentration of cinnamon added in brewed of pletekan leaves that gave the best result was studied. This study was arranged in randomized design with six concentrations of cinnamon and three replications. The parameters analyzed were total phenolic, tannin, antioxidant activity, and organoleptic results (hedonic test) that was analyzed with ANOVA at 5% level. The result showed that the addition of the highest cinnamon concentration (S6) gave the highest concentration of phenol (224.88 ± 1.85 mg/L) and tannin (227.18 ± 1.67 mg/L) with the highest inhibition percentage as antioxidant (55.53 ± 0.16 %). In the organoleptic results, combination of pletekan leaves with the highest cinnamon concentration (S6) gave the highest preferred color (63.39%), taste (61.63%), and odor (70.2%), thus this one was the best combination in giving the preferred taste of beverage. So that, naturally brewed of pletekan leaves combined with cinnamon could increasing taste of it and expected to be a one of beverage from leaves. The brewed of pletekan leaves combined with cinnamon could increasing taste of it and expected to be a one of beverage from leaves as a raw material. Keywords: cinnamon, herbal beverage brewed, pletekan leaves