Mango (Magnifera indica) seed kernel from Nigeria were analyzed for proximate composition, inorganic ions, amino acid composition, tannin and fatty acid composition. Mango seed kernel had 44.4% moisture content, 6.0% protein, 12.8% fat, 32.8% carbohydrate, 2.0% crude fiber, 2.0% ash and 0.39% tannin. Mango kernel fat contained high amounts of stearic (46.3%) and oleic (40.0%), while palmitic, linoleic, arachidonic and behenic acids were present in small quantities (<6.6%). Of the inorganic ions detected, potassium (365 mg/100 g), phosphorus (140 mg/100 g), magnesium (100 mg/100 g) and calcium (49 mg/100 g) were present in high levels, while iron, sodium, manganese and zinc were present in small levels (< 11.0 mg/100 g). The mango seed kernel is potentially a good source of nutrients for human and animal feed.
SUMMARY Using relatively mild gas chromatographic conditions, including glass‐lined injectors, glass columns and lower operating temperatures, the occurrence of a number of previously reported hydrocarbon and oxygenated terpenes in pepper oil has been confirmed. On the basis of gas chromatographic retentions and matching of infrared spectral data, and in the case of the latter compound, mass and NMR spectrometry, cis‐p‐2‐methen‐1‐ol, cis‐p‐2,8‐menthadien‐1‐ol and transpinocarveol have been identified as constituents of black pepper oil. Spectral data are reported which permit the partial characterization of a number of additional oxygenated compounds. The presence of artifacts due to photocatalyzed rearrangements is demonstrated and discussed.
The use of sequentially coupled columns to achieve a binary liquid phase mixture has been simplified by the availability of zero dead volume fittings compatible with fused silica columns. The extent to which the velocity gradient through the coupled column affects the "apparent" liquid phase ratio can be determined by graphic interpolation; the length ratio of the coupled column segments can then be adjusted so that the "apparent" liquid phase ratio actually experienced by the solutes agrees with the targeted value. The f8Ct that the direction of flow through the coupled column affects the chromatographic dispersion suggests that accepted generalizations on flow optimization throughout the column may not be precisely correct. (1981).
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