Judul: Kinetika Perubahan Vitamin C Sebagai Fortifikan Dan Penentuan Umur Simpan Sari Buah Jeruk
Abstrak: The main objective of this research was to determine the kinetic degradation of vitamin C as a fortificant in orange juice and to predict its shelf life using Arrhenius model approach. Orange juice may experiences gradual browning formation during storage that causes a product expiration. Sensory testing (sweet, sour, and bitter taste) and color objective (L, a and b parameters) were used to measure the product quality. The combination of 1.2% malic acid and 0.05% vitamin C in orange juice was acceptable sensorically and experienceda least discoloration. The product shelf-life was extended up to 234 days (based on color) dan 101 days (based on vitamin C concentration). Vitamin C contributed 233% of nutritional adequacy value.
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Judul: Mempelajari Ketahanan Warna Beta Karoten dan Umur Simpannya pada Jelly Drink di PT. GarudaFood Putra Putri Jaya.
Abstrak: Penelitian ini bertujuan mempelajari aplikasi pembuatan jelly drink skala industri, dan memperkirakan umur simpan jelly drink dengan vitamin C maupun tanpa vitamin C dengan metode ASLT Arrhenius menggunakan parameter warna yang diukur secara sensori maupun dengan instrumen (Lab Hunter). Penelitian ini dibagi menjadi dua tahap yaitu (1) mempelajari aplikasi pembuatan jelly drink skala industri, (2) memperkiran umur simpan jelly drink dengan pewarna beta karoten yang ditambahkan vitamin C maupun tanpa vitamin C Pada tahap awal, penelitian dilakukan dengan mempelajarai aplikasi pembuatan jelly drink skala industri. Percobaan dilanjutkan dengan memperkirakan umur simpan jelly drink dengan pewarna beta karoten yang ditambahkan dengan vitamin C maupun tanpa vitamin C dengan parameter warna yang dianalisa secara instrumen maupun sensori. Jelly drink disimpan di chamber 35°C, 40°C dan 45°C. Jelly drink yang ditambahkan vitamin C dapat mempertahankan warna beta karoten dibanding tanpa vitamin C. Jelly drink tanpa vitamin C yang disimpan di chamber 35°C, 40°C dan 45°C mulai kehilangan warnanya pada hari ke 28 sedangkan jelly drink dengan penambahan vitamin C masih dapat diterima warnanya secara sensori pada hari ke-35. Perkiraan Umur simpan jelly drink menggunakan Accelerated Shelf-Life Test (ASLT) model Arrhenius. Jelly drink dengan pewarna beta karoten tanpa vitamin C dengan metode ASLT Arrhenius memiliki umur simpan yang lebih singkat. Jelly drink yang memakai vitamin C dapat mempertahankan kestabilan warna beta karoten selama 543 hari (27°C) dan 335 hari (33°C) secara instrumen sedangkan dengan uji sensori 189 hari pada 33°C. laju penurunan vitamin C yang disimpan pada suhu 45°C lebih cepat dibandingkan refrigerator (10°C), 35°C, dan 40°C.
Keyword: beta carotene, jelly drink, ASLT

Judul: Distribution and Diversity of Ectoparasite Mites on Geckos in Indonesia
Abstrak: Data on the diversity and dispersal of parasitic mites on house geckos in Indonesia are very scarce. In this work, the distribution and diversity of mites living on three species of house geckos, namely Cosymbotus platyurus, Hemidactylus frenatus, and H. garnotii collected throughout Indonesia, has been elaborated. Geckos and mites were captured and immediately preserved in 70% ethanol. Whole mount of the mites was prepared by clearing in lactophenol followed by mounting on polyvinyl lactophenol solutions. The SEM preparation was conducted to examine the detail morphological characters of the mites. The results showed that among 448 individuals of geckos, 221 geckos were infected by Geckobia mites. Prevalences of C. platyurus, H. frenatus, and H. garnotii infested by mites were 14.8%, 50.69%, and 79.6%, respectively. Three different spesies of Geckobia (G1, G2, and G3) could be differentiated; and based on similarities of their morphological characters to ones described in published literatures, Geckobia G2 is Geckobia glebosum and Geckobia G3 is Geckobia bataviensis while G1 could not be identified to the species level. The highest mean intensity of Geckobia G1 infestation was found on H. garnotii (I=7.0), G. glebosum infestation on H. frenatus (I=3.5), and G. bataviensis infestation on H. garnotii (I=11.8). In general, C. platyurus was infested by the least number of mites. Geckobia G1 were found living on the skin folds on the claws, G. glebosum were found mainly on the body and thigh, and G. bataviensis were found on almost all parts of the host’s body. Geckobia mites are distributed randomly throughout Indonesian Archipelago, following the pattern of distribution of their hosts. So it is concluded that Geckobia G1, G. glebosum, and G. bataviensis are sympatric.
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