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Occurrence of Hydrolysis Products of Phospholipids in Some Sub-humid Tropical Soils of Bangladesh

R. MANDAL
Department of soil Science, University of Dhaka, Bangladesh.

A. ISLAM
Department of soil Science, University of Dhaka, Bangladesh.

Abstract/ Executive Summary:

Hence and Anderson’s method for determining lipid phosphate was found best among the four methods used due to double over-night pretreatment. Air-dried samples yielded lower lipid values than the fresh ones due to changes in the nature of the organic matter itself on drying, or adsorption and binding of lipids to clay fractions. Concentrations of phosphatidyl choline, phosphatidyl ethanolamine and glycerophosphate ranged from 0.65 to 9.50, 0.30 to 3.60 and 015 to 2.25 ppm, respectively and each was significantly correlated with organic phosphate, total phosphate, organic carbon and total nitrogen content of the samples. All the fractions, however, showed better correlation to the cumulative effect of the same variables.

Keywords: Tropical soils, Soils of Bangladesh, Phosphate, Phospholipids

Location:

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Soil fertility

Objectives:

To estimate the relative amounts of their hydrolysis products in some sub-humid tropical soils of Bangladesh and evaluation of their relationships with soil properties.

Methodology:

Samples of surface soils (0 to 15 cm) were collected from different sites in Bangladesh containing high organic matter which represented ten soil series and five major soil groups. The soils were air dried, mixed and sieved through a 100 mesh screen. Fresh soil samples were also preserved properly. Data on certain physical and chemical properties of the soil samples studied are presented. Analytical methods: Analysis were made for pH by the Pye glass electrode method (soil : solution ratio 1 : 2.5), organic carbon by wet oxidation method, total nitrogen method, organic and total phosphorus and the hydrolysis products of phospholipids. Extraction and estimation of phospholipids were undertaken by the methods.

Source of Information: Dacca University Studies, B, XXVII (1): 39-46, 1979 (January)

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The extracted lipid phosphate content in fresh samples was higher than those of air-dried ones in all methods. However, extracted lipid phosphate in equal amounts from both the fresh and air-dried samples where a slightly higher value was observed in the fresh sample. The reduction in solubility might have been due to changes in the nature of the organic matter itself on drying or adsorption and binding of the lipids to the clay fractions of the samples. Concentrations of phosphatidyl choline, phosphatidyl ethanolamine and glycerophosphate ranged from 0.65 to 9.50 ppm (mean 3.20 ppm), 0.30 to 3.60 ppm (mean 1.45 ppm) and 0.15 to 2.25 ppm (mean 0.66 ppm) respectively. These constituents constitute about 43.3 to 63.6%, 21.0 to 36.8% and 8.3 to 16.7% of the lipid phosphate respectively and 0.28 to 1.70%, 0.12 to 0.68% and 0.06 to 0.40% of the organic phosphate respectively. The values obtained in the present study compared well with findings of other investigators. Phosphatidyl choline and phosphatidyl ethanolamine accounted for 0.5 to 1.9% and 0.39 to 1.60% of the organic phosphate respectively and about 40 and 30% of the lipid phosphate respectively. Significant correlations between phospholipids and organic phosphate, total phosphate and organic matter have been reported earlier. Variation of phospholipids as well as their hydrolysis products with organic carbon and organic phosphate was due to the fact that these components are integral part of organic matter. Evidence from the present study supports this idea as the amounts of phospholipids as well as their hydrolysis products are positively correlated with clay contents of the samples. Concentrations of phosphatidyl choline, phosphatidyl ethanolamine and glycerophosphate ranged from 0.65 to 9.50, 0.30 to 3.60 and 015 to 2.25 ppm, respectively and each was significantly correlated with organic phosphate, total phosphate, organic carbon and total nitrogen content of the samples. All the fractions, however, showed better correlation to the cumulative effect of the same variables.

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