Chemical Properties. Chemical Constituents Maximum % as per BIS 1786: 2008 for Fe 500D grade of steel Carbon 0.30 Sulphur 0.055 Phosphorus 0.055 Sulphur + Phosphorus 0.105
Chemical Properties. Curcumin, or diferuloylmethane, is a α, β-unsaturated ketone which comprises about 2-8% of turmeric by weight and exists has an orange-yellow crystalline powder. The molecular weight of curcumin is 368.4 g/mol, and the melting point is 179-183°C. The chemical structure of curcumin was first described in 1973 and includes two methoxyl groups, two phenolic hydroxyl groups, and three double conjugated bonds. The bis-keto form of curcumin predominates under neutral and acidic aqueous conditions but exists in equilibrium with its enol tautomer especially at room temperature (Fig 1.1).
FIG 1.1. Structure of curcumin. Curcumin contains two carbonyl groups which forms a diketone. The diketone switches between the stable enol (protonated) and enolate (deprotonated) forms.
Chemical Properties. Monsalud and Nicolas (1958) found that bamboos contain ash, silica and pentosans than xxxxx. Semana et al. (1967) found that the Philippine bamboos had higher ash and silica content than those of Asian bamboos, but lower lignin content than the Indian species. The silica content increases in a linear fashion from internode 2 of the butt portion (1.6%) to internode 30 (9.9%) in B, blumeana (Espiloy, 1983). Shoots of three age levels (7, 10 and 15 days after emergence) of different bamboo species were chemically analyzed by Xxxxxxxx and Xxxxxxx(l978) for nutrient components. Results showed that the age level had no relation to the nutrient contents of the shoots which were largely similar,
Chemical Properties
