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Acta Alimentaria
Authors:
M. Kadivec
,
M. Kopjar
,
D. Žnidarčič
, and
T. Požrl

In this study ascorbic acid and phenolic compounds contents of eggplant flesh and eggplant peel were determined. Among the investigated eggplant cultivars generally eggplant peel had higher ascorbic acid and phenolic compounds contents than eggplant flesh. Ascorbic acid content in eggplant flesh ranged from 33.62 to 92.75 mg kg−1 and in eggplant peel from 12.45 to 111.01 mg kg−1. Phenolic compounds content ranged from 11.77 to 22.18 g kg−1 in eggplant flesh and from 13.46 to 29.42 g kg−1 in eggplant peel. Eggplant peel is usually treated as waste, i.e. byproduct, omitting its potentially beneficial characteristics. Due to higher ascorbic acid and phenolic compounds contents, further investigations should be directed on possible use of eggplant peel as natural ingredient for functional products formulation.

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, Z. Z. ( 2012 ) Kinetic study for phosphate removal from waste water by recycled datepalm wastes as agricultural by-products . Int. J. Environ. Stud . 69 : 135 – 149

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wheat milling industry that continues to develop each passing day produces a large amount of different by-products during separating the endosperm. The obtained by-products from the milling industry can be called as germ, red-dog flour, bran, and shorts

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Introduction The increasing demand for food has led to the accumulation of more and more by-products. In particular, the waste from agricultural cultivation, if not properly treated, will cause the accumulation of organic waste, thus has the risk of

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Acta Alimentaria
Authors:
F. Abulude
,
W. Adesanya
,
M. Ogunkoya
,
O. Elemide
, and
E. Esiet

The nutritional composition of ogi and its by-products were evaluated with respect to proximate composition, mineral contents and physicochemical properties using standard methods of analysis. The results showed that guinea corn contained more protein (17.52%) than maize (11.24%), but was lower in nitrogen free extract, lipid and minerals (P, K, Na, Fe, Zn and Cu). The predominant content of residue was fibre.

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Journal of Thermal Analysis and Calorimetry
Authors:
J. Amorim
,
S. Eliziário
,
D. Gouveia
,
A. Simőes
,
J. Santos
,
M. Conceiçăo
,
A. Souza
, and
M. Trindade

Abstract  

The thermogravimetry (TG) is a technique used in the quality control of foods. In this work the moisture and ash contents in the rice and by-products (bran and husk), the thermal stability and the gelatinization process by conventional, thermogravimetric and calorimetric methods were studied. The moisture and ash contents obtained by TG and conventional methods did not present significant differences. The rice presented higher starch content, while the bran presented higher protein content. The thermogravimetric data presented the following thermal stability order: rice>bran>husk. The calorimetric curves indicated the gelatinization of the starch. The kinetic parameters were compatible.

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Abstract  

Instrumental neutron activation analysis (INAA) with gamma-ray spectrometry was applied to determine As, Ca, Cd, Cl, Co, Cu, Cr, Fe, Hg, K, Mg, Mn, Mo, Na, Sb, Se and Zn in the Brazilian agroindustrial by-products. These materials are widely used in ruminant feeding. The results obtained were compared with requirement and maximum tolerable concentrations. The general conclusions from the data obtained were: (1) many by-products presented concentrations of some essential elements lower than the requirement concentrations, while in some concentrations of Cr, Fe, Mg and Se exceeded by a little the maximum tolerable concentrations, (2) the elements As, Cd, Hg and Sb, generally considered toxic, showed concentrations lower than maximum tolerable values.

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Abstract  

The rate of heat evolution as well as total heat output are strongly affected by other components of hydrating mixture, apart from neat portland cement, such as slag, fly ash and other industrial by-products; among them the wastes from fluidised bed combustion (FBC) has been taken into account recently. In this study the calorimeter was applied to follow the early hydration of cements produced with these materials. They interact with cement paste in a few ways: as set controlling agent and as active pozzolanic admixtures. Thus the rate of heat evolution/hydration is modified, depending on the composition of clinker and percentage of waste in the mixture. After the series of measurements for clinker-waste mixture hydrated systems also some ‘model’ mixtures were investigated to separate the effects from particular waste components.

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Abstract  

The concentration of 226Ra, 232Th and 40K has been determined by -ray spectrometry. The measured activity in the selected building materials and by-products of coal fired power plants ranges from 21.5 to 91.3 Bq·kg–1, 15.4 to 63.2 Bq·kg–1 and 83.2 to 683.9 Bq·kg–1 for 226Ra, 232Th and 40K, respectively. The results were compared with the reported data of other countries and with the world average activity of soil. The radium equivalent activities values of all building materials are lower than the limit of 370 Bq·kg–1, equivalent to a -dose of 1.5 mSv·y–1. The values of the external hazard index and the internal radiation hazard index are less than unity.

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Progress in Agricultural Engineering Sciences
Authors:
Tamás Csurka
,
Klára Pásztor-Huszár
,
Adrienn Tóth
,
Richárd Pintér
, and
László Ferenc Friedrich

Introduction The utilization of byproducts, especially by-products of animal origin, will be more important than ever before in the near future because of the increasing world population and need of food, especially meat products. Sustainability and

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