Adhesives Out of a Betel Nut
adhesives
Abstract
Water hyacinth was introduced as an ornamental crop species in many countries more than a century ago, because of their attractive blue, lilac to purplish flowers and round to oval leaves. They were supplied to many gardeners and horticulture institutes and were supposed to be a prized species.
Soon, it was realized to be an invasive species due to their adaptability to a wide type of fresh water ecosystems and interference with human activities. Thus a huge amount of money, and efforts have been invested since then for their management. However, it was recently realized that they could be substainably managed in their natural ecosystem and used in biofuel production, generating ample avenues of research, development and marketing of their end product (i.e. bioethanol and biogas). As the search for alternatives to fossil fuel intensifies in this age of modernization and industrialization, fuelled by increasing energy costs, water hyacinth holds a strong promise in the 21st century biofuel industry. The antoxidative properties of water hyacinth leaves were investigated by evaluating the scavenging capacity of liquid extracts in a competitive protective process against oxygenated free radicals (OFRs) released via electrolysis in a phosphate buffer with a Pt electrode. Colorimetric measurements carried out at 515 nm, through a N,N-diethyl-1,4-phenylenediamine (DPD) assay, showed a decreased absorbance of the sample, as compared to the blank obtained by electrolysis of the buffer without plant extract, revealing, thereby, the presence of antioxidizing agents in the liquid extracts. The antioxidative activity was estimated in terms of equivalent-glutathione (EG, in nmoles equivalent-glutathione per gram of dry plant material selected (eg/gdp)), and compared to those of soya beans and garlic bulbs. The EG value increased with decreasing dilution factors, regardless to the plant type, suggesting a strong influence of the medium pH on the
Abstract
Water hyacinth was introduced as an ornamental crop species in many countries more than a century ago, because of their attractive blue, lilac to purplish flowers and round to oval leaves. They were supplied to many gardeners and horticulture institutes and were supposed to be a prized species.
Soon, it was realized to be an invasive species due to their adaptability to a wide type of fresh water ecosystems and interference with human activities. Thus a huge amount of money, and efforts have been invested since then for their management. However, it was recently realized that they could be substainably managed in their natural ecosystem and used in biofuel production, generating ample avenues of research, development and marketing of their end product (i.e. bioethanol and biogas). As the search for alternatives to fossil fuel intensifies in this age of modernization and industrialization, fuelled by increasing energy costs, water hyacinth holds a strong promise in the 21st century biofuel industry. The antoxidative properties of water hyacinth leaves were investigated by evaluating the scavenging capacity of liquid extracts in a competitive protective process against oxygenated free radicals (OFRs) released via electrolysis in a phosphate buffer with a Pt electrode. Colorimetric measurements carried out at 515 nm, through a N,N-diethyl-1,4-phenylenediamine (DPD) assay, showed a decreased absorbance of the sample, as compared to the blank obtained by electrolysis of the buffer without plant extract, revealing, thereby, the presence of antioxidizing agents in the liquid extracts. The antioxidative activity was estimated in terms of equivalent-glutathione (EG, in nmoles equivalent-glutathione per gram of dry plant material selected (eg/gdp)), and compared to those of soya beans and garlic bulbs. The EG value increased with decreasing dilution factors, regardless to the plant type, suggesting a strong influence of the medium pH on the
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