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 Pengaruh Suhu lama PEnyimpanan terhadap Stabilitas Vitanim C (Asam Askorbat) Pada Produk Minuman Sari BUah Jeruk Kemasan Tetra Pak dan Botol
Abstrak: Penelitian ini bertujuan untuk mempelajari pengaruh suhu dan lama penyimpanan terhadap stabilitas vitamin C pada produk minuman sari buah jeruk dengan jenis kemasan Tetra Pak dan botol. penelitian ini dilakukan di Laboratorium Kimia Gizi, Jurusan Gizi Masyarakat dan Sumberdaya Keluarga, Fakultas Pertanian, Institut Pertanian Bogor. Penelitian berlangsung mulai bulan Pebruari 1994 sampai bulan April 1994. Produk yang diteliti adalah minuman sari buah jeruk kemasan Tetra Pak dan kemasan botol. Sampel produk diperoleh dari PT Salim Graha yang terletak di Jalan Raya Bekasi KM 27. Pengambilan sampel dilakukan secara acak pada satu kali produksi. Alat yang dipergunakan dalam penelitian ini adalah peralatan untuk analisa kandungan vitamin C, total asam, pH, total padatan terlarut dan analisa kualitatif asam benzoat.
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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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