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Abstrak :
Tesis ini mempelajari mengenai pengaruh injeksi ekstrak Andaliman dan Alpha-Tocopherol sebagai green corrosion inhibitor pada baja API 5L dalam larutan HCl 1M. Dengan pengujian weight loss diperlihatkan bahwa inhibitor campuran antara ekstrak Andaliman dan Alpha-Tocopherol mampu menurunkan laju korosi dengan efisiensi 92.07 pada konsentrasi inhibitor 2 ml Andaliman 0.5 ml Alpha-Tocopherol. Dari pengujian polarisasi ditunjukkan bahwa inhibitor campuran antara ekstrak Andaliman dan Alpha-Tocopherol menggeser kurva polarisasi kearah atodik dan katodik mixed type inhibitor , yang menunjukkan ciri utama sebagai inhibitor dari bahan organik. Pengujian dengan FTIR dan GCMS memperkuat dugaan bahwa inhibitor ekstrak Andaliman dan Alpha-Tocopherol sebagai inhibitor adsorpsi/film forming. ......This thesis is intended to study the influences of Andaliman extract and Alpha- Tocopherol injection as green corrosion inhibitor for API 5L steel in HCl 1M solution. By weight loss analysis, it show that mixed inhibitor from andaliman extract and Alpha-Tocopherol can reduce corrosion rate with efficiency up to 92.07 % under inhibitor injection about 2 ml Andaliman + 0.5 ml Alpha- Tocopherol. By polarization, it is shown that inhibitor shift polarisation curves for both of anodic and cathodic polarisation (mixed type inhibitor), shows that inhibitor have characteristic as inhibitor from organic material. By FTIR and GCMS analysis can be concluded that inhibitor from Andaliman and A- Tocopherol act inhibition by adsorption/film forming corrosion inhibitor.

Abstrak :
Penelitian mengenai potensi antioksidan alfa-tokoferol terhadap tingkat maturasi dan kualitas oosit domba garut (Ovis aries) pascakriopreservasi menggunakan metode slow freezing telah dilakukan. Sebanyak 138 oosit yang memiliki kualitas A dan B dimaturasi dalam medium TCM-199 dengan penambahan antioksidan alfa-tokoferol pada konsentrasi 0 mM, 100 mM, 150 mM, dan 200 mM. Oosit hasil maturasi in vitro tersebut, kemudian dikriopreservasi serta diamati tingkat maturasi dan kualitasnya. Pengamatan tingkat maturasi dilihat berdasarkan pembentukan badan polar I. Pengamatan kualitas oosit meliputi kondisi morfologi dan viabilitas menggunakan pewarna Hoechst dan propidium iodide. Hasil penelitian menunjukkan bahwa tidak ada perbedaan signifikan antarkonsentrasi secara statistik (P > 0,05), namun terdapat kecenderungan konsentrasi 150 mM memiliki persentase tertinggi terhadap tingkat maturasi oosit in vitro (88,57%); viabilitas (82,86%); dan kondisi morfologi (82,86%). Dengan demikian, 150 mM alfa-tokoferol merupakan konsentrasi terbaik yang mampu mempertahankan stabilitas oosit pascakriopreservasi.

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The study of the potential alpha-tocopherol antioxidants towards garut sheep (Ovis aries) oocyte maturation and quality post-cryopreservation using slow freezing method has been conducted. A total of 138 oocytes which have A and B qualities, were maturating in TCM-199 medium with the addition of alpha-tocopherol antioxidants at concentrations of 0 mM, 100 mM, 150 mM, and 200 mM. Oocytes from in vitro maturation are then cryopreserved and the maturity and quality was observed. Observation of oocyte maturation was seen based on the formation of the polar body I. Observation of oocytes quality includes morphological condition and viability by Hoechst and propidium iodide dyes. This experiment showed that there was no statistically siginificant difference between concentrations (P > 0.05), but there is a tendency of 150 mM have the highest percentage of oocyte in vitro maturation (88.57%); viability (82.86%); and morphological condition (82.86%). In conclusion, presence of 150 mM alpha-tocopherol was the optimal concentration that is able to maintain the oocyte membrane stability post-cryopreservation.