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This study utilizes lemon peel waste which was previously only as garbage that has no selling value to be valuable or has a selling value by making it essential oil to be applied in making liquid soap. This study aims to determine the effect of concentrations of essential oil extraction solvents and local lemon peels on the yield and characteristics of liquid soap. This study used a Randomized Block Design (RBD) with two factors, namely the type of fresh or dried lemon peel and the concentration of the methanol solvent used is 100%, 85% and 70%, then carried out two replications of each treatment.The tests carried out were the amount of yield in essential oils, liquid soap pH test, foam stability test, and organoleptic hedonic test which included the aroma of liquid soap, liquid soap color, liquid soap clarity, and viscosity of liquid soap. In this study, it can be concluded that the difference in interaction between the type of material and the concentration of methanol solvent did not significantly affect the level of 5% and 1% of all tests. The difference in the type of material has a very significant effect on 1% of the oil yield and is real 5% at the pH of liquid soap, and the difference in methanol plate concentration which has a significant (1%) effect on yield and clarity, and at 5% at pH and the smell of liquid soap. The best treatment was obtained by B1C3 with a yield characteristic of 283.35%; pH 9.82; foam height 69.2%; aroma 1.54; color 1.76; clarity 1.92; and viscosity 1.67.

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PENGARUH KONSENTRASI PELARUT PADA PROSES EKSTRAKSI MINYAK ATSIRI DAN JENIS KULIT LEMON LOKAL (Citrus limon (L.) Burm.f.) TERHADAP RENDEMEN MINYAK ATSIRI DAN KARAKTERISTIK SENSORI SABUN CAIR