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The third method depends on first derivative of the ratios spectra by measurements of the amplitudes at and The fourth one depend on isosbestic point at All the proposed methods were extensively validated. They have the advantage of being economic and time saving. All the described methods can be readily utilized for the analysis of pharmaceutical formulations.
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The results obtained by adopting the proposed methods were statistically analyzed and compared with those obtained by official methods. FLU is in a class of medications called corticosteroids. Fluticasone propionate was determined by spectrophotometric methods [ 1314 ] and by HPLC [ 15 - 17 ].
HPLC is successful for the determination of drugs in pharmaceutical dosage forms and biological samples.
Owing the widespread use of HPLC in routine analysis, it is thoroughly validated [ 18 - 20 ]. Derivative spectrophotometry has been found to be a useful method in the determination of mixtures with two or more components having overlapping spectra and in eliminating interference from formulation matrix by using the zero-crossing techniques [ 21 - 23 ].
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Ratio-spectra derivative spectrophotometric method has also been found to be useful in the estimation of drugs in their mixtures. This method permits the determination of a component in their mixture at the wavelengths corresponding to a maximum or minimum and also the use of peak-to-peak between consecutive maximum and minimum.
The main advantage of derivative of the ratio-spectra method may be the chance of easy measurements in correspondence of peaks so it permits the use of the wavelength of highest value of analytical signals maximum or minimum.
Moreover, the presence of a lot of maxima and minima is another advantage by the fact that these wavelengths give an opportunity for the determination of active compounds in the presence of other active compounds and excipients which possibly interferes the analysis [ 24 - 26 ]. Though recommendations on dates appropriate for sowing exist across all agro-ecological zones where maize is cultivated, staggered dates of sowing is prevalent in Nigeria thereby making available to borers maize stands at different phenological stages for completion of several generations Consistent with the findings of Ogunwoluand Okweche and UmoetokB.
As previously observed by Bosque-Perez and Dabrowskias well as Polaszekthe early- planted crop was less severely infested and damaged compared with the later crop. The significant reductions in infestation and damage accompanied by yield increases with application of carbofuran against stem borers agreed with the findings of Egwuatu and ItaDaramolaHalimie et al.
Daramola alluded to the contributory role of nematicidal action of carbofuran in increasing yield in his study.
Sosan and Daramola found that yield loss could be consistently and reliably predicted from percentage bored node and internode. In that study, the respective ranges of data reported were This was not our experience. Though the ranges of bored internodes in our study were wider, 7.
Explanation may be found in differences in borer species composition and abundance and in differences in environmental conditions mediating crop-pest interaction. As observed in the study by Ajala et al.
However, the advantage of reduced sampling time and cost with foliar sampling is nullified by its low efficiency as a predictor of yield loss. In the absence of a robust yield loss predictive model based on borer damage detection in early crop growth stages at Makurdi, use of carbofuran will continue to be prophylactic.
Maize Zea mays L. Interrelationship among Chilo partellus damage parameters and their contribution to grain yield reduction in maize Zea mays L. Evaluation of maize Zea mays L. Maize supply to local industries in Nigeria: Preliminary studies on the occurrence of stem borer and incidence of stalk rot under varying plant population densities in maize.
Major insect pests of maize in Africa: