Judul: Karakteristik Sabun dengan Formula Tallow dan Ekstrak Temu Ireng (Curcuma aeruginosa) yang Berbeda
Abstrak: Tallow is a by-product that obtained from livestock production through fat rendering process. The high content of triglycerides in tallow can be utilized as raw bath soap with the saponification process. Temu ireng extract can be considered as fillers to the soap, because temu ireng extract countains higher total phenolic so that temu ireng can be acted as an antioxidants agent in the soap. The objective of this research was to study the characteristics of bath soap that made from different composition of tallow and extract temu ireng. Soap with A, B, and C formulation met the qualification with the SNI 06-3532-1994 in water content, the amount of fatty acid, and free alkaline, but did not to the amount of unsaponification fat. Soap with A, B, and C formula significantly affected the amount of fatty acids, pH value, unsaponifiable fat,and DPPH scavenging activity. The result of hedonic quality test from A, B, and C formula affected the intensity of color, temu ireng aroma, fatty aroma and foaming power significantly. DPPH scavenging activity had highest activity at 24.01% of C formula soap with antioxidant capacity of 73.47 mg EVC per 100 g and the amount of total phenolic was 17.32 mg GAE per 100 g.
Keyword: temu ireng (Curcuma aeruginosa), tallow, soap, Bogor Agricultural University (IPB)

Judul: Karakteristik Fisik Sabun Padat Berbahan Dasar Tallow dengan Penambahan Susu atau Krim
Abstrak: Animal fat generally have low economic value and less utilization. Animal fat can be processed into tallow through rendering process to produce a raw material in soap making. The purpose of this research was to analyze physical properties of soap by using tallow with milk or cream addition as raw material. The observed variables in this research were water content, hardness, pH, and foaming height. The randomized complete design with 4 treatments and 1 control was used as experimental design. Data were analyzed by analysis of variance (ANOVA). Kruskal Wallis test were used for nonparametric data. The results showed that water content of cream tallow soap and milk tallow soap had significant difference (P<0.05) with control soap. Hardness and foaming height of soap between treatments soaps and control soap had no significant difference. The value of pH of milk tallow soap had significant difference (P<0.05) with cream tallow soap and control. The organoleptic test results showed that cream tallow soap had significant difference (P<0.05) in colour with milk tallow soap. The cream tallow soap had no significant difference of favour with milk tallow soap. There was no significant difference on foaming ability between cream tallow soap and milk tallow soap.
Keyword: tallow, soap, physical properties

Judul: Cycle Hamilton pada Graf Lengkap, Graf Regular, dan Graf 2-Connected 4-Regular Berorder Kurang dari Sepuluh
Abstrak: Suatu graf disebut graf Hamilton apabila graf tersebut memuat cycle Hamilton, yaitu cycle yang melewati setiap vertex tepat satu kali. Menentukan keberadaan cycle Hamilton pada suatu graf dapat menggunakan syarat cukup yang berupa teorema-teorema yang telah diperkenalkan sejak tahun 1950-an. Beberapa syarat cukup yang dibahas dalam karya ilmiah ini adalah syarat cukup yang berhubungan dengan graf lengkap dan graf regular. Suatu graf lengkap berorder 𝑛������ ≥ 3 dan graf r-regular berorder 𝑛������ ≤ 2𝑟������ + 1 merupakan graf Hamilton, Karena kedua graf tersebut memuat cycle Hamilton. Selanjutnya, syarat cukup tersebut digunakan untuk menentukan keberadaan cycle Hamilton pada graf 2-connected 4- regular berorder kurang dari 10.
Keyword: graf Hamilton, graf regular, graf lengkap, graf 2-connected 4-regular