Judul: Kajian Pengaruh Bahan Baku Dan Nisbah Minyak Daun Cengkeh Dengan Larutan NaOH 10% Terhadap Rendemen Dan Karakteristik Isolat Eugenol
Abstrak: Indonesia has high potential clove leaves oil business opportunity especially in the areas that have high production of cloves, example Java island with cloves cultivation area are about ± 50,000 ha (Balitro 2005) .. It's predicted have falls clove leaves about ± 305 tones/day or equivalent with 4.4 ton clove leaves oil/day. According to Uhe (2005), International market prices for clove leaves oil on February 2005 are 4.25 US Dollar per kg. One way to increase clove leaves oil value is producing isolate compound of clove leaves oil, called eugenol. Eugenol prices is more expensive than clove leaves oil. For illustration, while clove leaves oil prices is Rp. 25,000lkg, eugenol prices is Rp. 75,000/kg (lndesso, 2006). In international market, eugenol from Indonesia has lower raw price because of its lower quality. The price is about 5.15 US Dollar per kg CUhe 2(05). Eugenol can be used as raws material in pharmaceutical, cosmetic, food industries, and also as mixture in ingredient for cigarette industries. Eugenol was produce by isolating eugenol from clove leave oil. The chemical process of eugenol isolating is conducted by reaction of clove ' leave oil and strong base by using (Natrium Hidroxyde) to form Na-eugenolat. Eugenol can be regmerated from Na-eugenolat by using the HCI solution. Based on Sumangat et. al research (2003), eugenol isolation with NaOH 6% and ratio of clove leaves and NaOH is 1:7 producing eugenol with yield 67.8- 68.3, purity 99.3% - 99.5% and effectively about 89.5%. The aim of this research is to get the best combination treatment between raws material and ratio between clove leaves oil and NaOH 10%. Distillation method will be doing in 2 ways, treatment will be conducted for distilled clove leaves oil with steam method and condensation method. Ratio between Clove leaves oil and NaOH 10% are 1: 2; 1 : 2.5; and 1 : 3. Treatment design will be using Complete Factorial Random Design Clove leaves oil reacting with NaOH 10%, squealer for 30 minutes with 590 rpm, left for 24 hours, then the substratum which is eugenol compound reacting with HCl 6%, then it washes using hexane. The yield, purity, effectively, and also the physical chemical of eugenol (i.e. refraction index, density, purity, solubility in ethanol 70% and colour) were analysed. The analysis shows that distilled clove leaves oil method affecting the yield, degree of purity, isolation process effectively, and isolat eugenol yield aspect, but the ratio clove leaves oil with NaOH 10% affecting isolation process effectively, and isolate eugenol yield. The Yield by distillation method of clove leaves oil are 63.71 % while steam method are 63.24%. Yield by ratio treatment of clove leaves oil and NaOH 10% (1: 2~ 1 : 2.5; 1 : 3) in sequence arc 63.37 %, 63.62 (%, ancl 63.44%. Eugenol purity by distillation method of clove leaves oil are 97.24 % while by steam method are 98.36 %. Eugenol purity by ratio treatment of clove leaves oil and NaOH 10% (1: 2; 1 : 2.5; 1 : 3) in sequence are 97.44 %,97.57 (Xl, and 98.39 %, and the isolation
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Judul: Process design in the production of isoeugenol and vanillin from eugenol of clove leaf oil
Abstrak: Eugenol merupakan komponen utama minyak cengkeh yang kandungannya dapat mencapai 70−95 % tergantung dari bahan baku yang digunakan (bunga, tangkai, dan daun). Dengan kandungan eugenol yang tinggi, minyak cengkeh merupakan sumber bahan baku isoeugenol dan vanilin yang potensial. Tujuan umum penelitian ini adalah menghasilkan rancangan proses produksi vanilin yang berbasis eugenol minyak daun cengkeh yang memiliki kalayakan teknis maupun finansial. Adapun tujuan khusus dari penelitian ini adalah 1) identifikasi isoeugenol dan vanilin hasil sintesis, 2) simulasi rancangan proses industri isoeugenol dan vanilin, 3) kelayakan finansial dan nilai tambah. Adanya penelitian ini diharapkan potensi ekonomis eugenol minyak daun cengkeh (MDC) secara maksimal dapat diusahakan, sehingga dapat memberikan nilai tambah minyak daun cengkeh.
Keyword: clove leaf oil, eugenol, isoeugenol, vanillin, process design, potential raw material

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