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Nugraha E. Suyatma Alain Copinet Lan Tighzert Veronique Coma 《Journal of Polymers and the Environment》2004,12(1):1-6
Biodegradable film blends of chitosan with poly(lactic acid) (PLA) were prepared by solution mixing and film casting. The main goal of these blends is to improve the water vapor barrier of chitosan by blending it with a hydrophobic biodegradable polymer from renewable resources. Mechanical properties of obtained films were assessed by tensile test. Thermal properties, water barrier properties, and water sensitivity were studied by differential scanning calorimeter analysis, water vapor permeability measurements, and surface-angle contact tests, respectively. The incorporation of PLA to chitosan improved the water barrier properties and decreased the water sensitivity of chitosan film. However, the tensile strength and elastic modulus of chitosan decreased with the addition of PLA. Mechanical and thermal properties revealed that chitosan and PLA blends are incompatible, consistent with the results of Fourier transform infrared (FTIR) analysis that showed the absence of specific interaction between chitosan and PLA. 相似文献
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Marie Czamanski Adi Nugraha Philippe Pondaven Marine Lasbleiz Annick Masson Nicolas Caroff Robert Bellail Paul Tréguer 《Marine Biology》2011,158(12):2847-2862
The elemental carbon (C), nitrogen (N) and phosphorus (P) compositions of the whole-body and gut content of wild marine fish
inhabiting the Bay of Biscay (Northeast Atlantic) were studied. Furthermore, the literature was examined for studies of aquacultured
fish, reporting the elemental composition of the whole-body fish, that of their food, and nutrient assimilation and gross
growth efficiencies (GGE). In both wild-caught and aquacultured fish, significant differences in C, N and P elemental composition
were found between species, with P being the most variable component. Differences among species in terms of C, N and P content
could be explained by varying proportions of storage compounds in whole-body fish, and varying degrees of ossification. Aquacultured
fish feces were found to be P-rich, because of a lower P assimilation efficiency, compared to C or N assimilation efficiencies.
Examination of aquacultured fish literature also revealed that C, N and P GGE and nutrient resupply ratios agreed with basic
principles of homeostatic regulation of whole-body fish elemental composition. Extrapolation of the results to broader marine
systems indicated that fish may be important for conveying nutrients toward the ocean interior. 相似文献
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Nugraha Edhi Suyatma Alain Copinet Estelle Legin-Copinet Florence Fricoteaux Véronique Coma 《Journal of Polymers and the Environment》2011,19(1):166-171
PLA grafting on chitosan has been successfully prepared with two different methods: a direct grafting method and the ROP method.
The thermal properties showed that the copolymerization of PLA on the chitosan’s chain by direct grafting is more thermostable
than the one obtained by the ROP method. 相似文献
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Tehubijuluw Hellna Subagyo Riki Yulita Maulil Fatma Nugraha Reva Edra Kusumawati Yuly Bahruji Hasliza Jalil Aishah Abdul Hartati Hartati Prasetyoko Didik 《Environmental science and pollution research international》2021,28(28):37354-37370
Environmental Science and Pollution Research - Red mud as industrial waste from bauxite was utilized as a precursor for the synthesis of mesoporous ZSM-5. A high concentration of iron oxide in red... 相似文献
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Nugraha Willy Cahya Ishibashi Yasuhiro Arizono Koji 《Journal of Material Cycles and Waste Management》2023,25(5):2619-2631
Journal of Material Cycles and Waste Management - The present study examined the distribution and severity of heavy metal contamination in the sediments of the Ciujung Watershed and its tributaries... 相似文献
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