Judul: Aplikasi Siklodekstrin untuk Mengontrol Pelepasan Aroma pada Produk Skin Lotion
Abstrak: The aroma in skin lotion usually release by storage conditions (time, temperature, packaging). The aroma in product can be controlled by the addition of stabilizer. In this study, cyclodextrin added to reduce the loss of aroma (cananga oil perfume) in skin lotion. The addition of cyclodextrin was at various concentrations (0%-1%). The aroma concentration in skin lotion analyzed by GC-MS method and sensory analysis. The skin lotions were kept in close and open bottles, at 50oC for 1 month. The result showed that skin lotion quality such as pH, viscosity, and emulsion stability were improved by cyclodextrin addition. Aroma compound contain β- Caryophyllene, α-Caryophyllene, α-Farnesene, and δ-Cadinene by GC-MS. The addition of 0,8% cyclodextrin resulted a good product with less loss of aroma from the product. α-Farnesene and δ- Cadinene can be maintained, while α, β-Caryophyllene loss decrease by 22% and 33%, in close bottle. It is suggested for further study to look at aroma release in storage for more than 1 month.
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Judul: Pengaruh Penambahan Minyak Nilam sebagai Fiksatif terhadap Ketahanan Wangi Gel Pengharum Ruangan Alami.
Abstrak: Conventional gel air freshener mostly contains sinthetic materials, especially fragrance and fixative agent, which potentially harms human health and the environment. Therefore, it is necessary to develop product that more friendly to the environment and save for human by using natural essential oil. This natural gel air freshener scents in a short periode if its used in high room temperature. So, as natural fixativea agent, patchouly oil is added in this research. Patchouly oil has a high boiling point and specific aroma. The purpose of this study are to determine suitable gel formula by hedonic test, the weight loss of the product during four weeks, concentration of patchouly oil which results in the best aroma resistance and its effectiveness as fixative agent in gel based air freshener by comparison pairwise test. The results showed that the best gel formula is contains of 3% of carrageenan, 1% of agar-agar, and 1% of glucomannan. Product containing 0% of patchouly oil and 8,9% of lemon oil showed the most prefered colour and the most prefered aroma. The lowest product weight loss is 57,44%, which is resulted from the addition of 1,1% of patchouli oil to 8,9% of lemon oil. The best aroma retention is resulted from the addition of 1,1% of patchouli oil to 8,9 % of lemon oil. The most effective concentration of patchouli oil in binding the gel air freshener aroma is 1,1%.
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Judul: Closed Knight’s Tour pada Papan Catur Berbentuk Persegi Panjang dengan Ukuran Maksimal 8 × 8
Abstrak: Closed Knight’s Tour merupakan langkah kuda yang mengunjungi setiap kotak pada papan catur tepat satu kali dengan langkah kuda berawal dan berakhir pada kotak yang sama. Graf yang terbentuk dari closed knight’s tour dinotasikan sebagai graf G(m,n), dengan m adalah banyaknya baris dan n adalah banyaknya kolom. Graf tersebut memuat Hamiltonian cycle. Sebuah graf terhubung G adalah graf bipartite jika dan hanya jika graf tersebut tidak memiliki cycle dengan panjang ganjil. Papan catur yang memenuhi syarat cukup untuk memiliki closed knight’s tour adalah papan catur berukuran 5 × 6, 5 × 8, 6 × 6, 6 × 7, 6 × 8, 7 × 8, dan 8 × 8.
Keyword: bipartite, closed knight’s tour, hamiltonian cycle, knight’s tour, teori graf