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: Pengaruh Penambahan Ekstrak Tea Tree dan Peppermint pada Kualitas Sabun Padat Berbahan Dasar Tallow
Abstrak: Tallow merupakan minyak yang diperoleh dari hasil ektraksi lemak abdomen sapi. Tallow dari lemak sapi umumnya digunakan untuk produksi sabun. Penelitian ini bertujuan menganalisis kualitas sabun padat berbahan dasar tallow dengan penambahan ekstrak tea tree dan peppermint dengan taraf yang berbeda. Penelitian menggunakan rancangan acak lengkap yang terdiri dari 4 perlakuan dan 3 ulangan. Perlakuan dalam penelitian ini adalah penambahan ekstrak tea tree dan peppermint pada sabun tallow 0% (P1), penambahan 2% (P2), penambahan 5% (P3), penambahan 8% (P4). Parameter yang diamati adalah kadar air, keasaman pH, asam lemak bebas, dan uji bakteri dengan melihat adanya zona bening pada sabun. Hasil rata-rata yang didapatkan pada penelitian ini ialah kadar air 19,65%, keasaman pH 9,12, asam lemak bebas 0.27% dan ditemukan zona bening terhadap bakteri P.acnes, E.coli and S.aureus., Tallow is an oil obtained from the extraction of cow abdominal fat. Tallow from beef tallow is generally used for soap production. This research aims to analyze the quality of solid soap made from tallow with the addition of tea tree and peppermint extracts at different levels. The research used a completely randomized design consisting of 4 treatments and 3 replications. The treatments in this research were the addition of tea tree and peppermint extracts to tallow soap 0% (P1), addition of 2% (P2), addition of 5% (P3), addition of 8% (P4). The parameters observed were water content, pH acidity, free fatty acids, and bacterial testing by looking at the clear zone in the soap. The average results obtained in this study were water content 19.65%, acidity pH 9.12, free fatty acids 0.27% and a clear zone was found for P.acnes, E.coli and S.aureus bacteria.
Keyword: antibacterial soap, quality solid soap, peppermint, tallow soap, tea tree

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