Influence of drying method and location on proximate chemical composition of African metallic wood boring beetle, Sternocera orissa (Coleoptera: Buprestidae) in Republic of South Africa

2012 ◽  
Vol 6 (6) ◽  
Author(s):  
Kagiso G. Shadung
Keyword(s):  
South Africa ◽  
Chemical Composition ◽  
Drying Method ◽  
Wood Boring ◽  
Proximate Chemical Composition

scholarly journals Proximate Chemical Composition of Dried Shrimp and Tilapia Waste Bioflocs Produced by Two Drying Methods

2021 ◽  
Vol 9 (2) ◽  
pp. 193
Author(s):  
Tarq Binalshikh-Abubkr ◽  
Marlia M. Hanafiah ◽  
Simon Kumar Das
Keyword(s):  
Chemical Composition ◽  
Freeze Drying ◽  
Drying Methods ◽  
Shrimp Waste ◽  
Drying Method ◽  
Iron Copper ◽  
Nutrient Value ◽  
Nitrogen Free Extract ◽  
Freeze Dried ◽  
Proximate Chemical Composition

The effects of two waste sources, red hybrid tilapia (Oreochromis sp.) and whiteleg shrimp (Litopenaeus vannamei), and two drying methods (freeze-drying and oven-drying) on the proximate chemical composition of bioflocs were investigated. In total, four kinds of experimentally treated bioflocs were compared to identify the best waste source and drying method to produce biofloc of an acceptable nutrient value: freeze-dried shrimp biofloc (FDSBF), oven-dried shrimp biofloc (ODSBF), freeze-dried tilapia biofloc (FDTBF), and oven-dried tilapia biofloc (ODTBF). The protein, lipid, ash, fiber, total nitrogen free extract (NFE), and energy contents of the dried bioflocs ranged from 12.12 to 24.09 g/100 g, 0.35 to 0.92 g/100 g, 42.45 to 61.01 g/100 g, 7.43 to 17.11 g/100 g, 16.45 to 18.59 g/100 g, and 0.99 to 1.94 Kcal g−1, respectively. Statistically, there were significant differences within the means of the two biofloc sources in terms of their proximate compositions (p < 0.05). The average values between the drying methods for protein, lipid, total NFE, and energy were also significantly different, while no significant differences (p > 0.05) were recorded for ash and fiber. Amino acids (AAs) were higher in FDTBF, followed by ODTBF. The mineral profiles showed that phosphorous, potassium, manganese, selenium, and copper were higher in the tilapia waste bioflocs, while calcium, zinc, iron, copper, chromium, and cobalt were higher in the shrimp waste bioflocs. Although the statistical analysis showed that the shrimp waste bioflocs had higher levels of lipid, fiber, total NFE, and minerals, the tilapia waste bioflocs contained higher levels of potential AAs, energy, and protein, which are regarded as expensive ingredients in aquaculture feeding. This study indicates that biofloc derived from tilapia waste can be regarded as a more suitable source of biofloc meal (in terms of protein, ash, energy, and AAs) than biofloc derived from shrimp waste. Our findings also suggest that freeze-drying is a more effective drying method for drying biofloc, as it efficiently maintains nutritional quality.

scholarly journals Chemical composition, antioxidant activities and antibacterial activities of essential oil from Erythrina caffra Thunb. growing in South Africa

Heliyon ◽  
2021 ◽  
pp. e07244
Author(s):  
Olubunmi A. Wintola ◽  
Aderonke A. Olajuyigbe ◽  
Anthony J. Afolayan ◽  
Roger M. Coopoosamy ◽  
Olufunmiso O. Olajuyigbe
Keyword(s):  
South Africa ◽  
Chemical Composition ◽  
Essential Oil ◽  
Antioxidant Activities ◽  
Antibacterial Activities

Chemical composition, antioxidant capacity, and sensory quality of dried jujube fruits as affected by cultivar and drying method

2016 ◽  
Vol 207 ◽  
pp. 170-179 ◽  
Author(s):  
Aneta Wojdyło ◽  
Adam Figiel ◽  
Pilar Legua ◽  
Krzysztof Lech ◽  
Ángel A. Carbonell-Barrachina ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Antioxidant Capacity ◽  
Sensory Quality ◽  
Drying Method

OPTIMIZATION OF DRYING OF TOBACCO LEAF WITH A SLIT OF THE MIDDLE VEIN ACCORDING TO THE QUALITY INDICATORS OF TOBACCO RAW MATERIALS

2021 ◽  
Author(s):  
Е.Е. УЛЬЯНЧЕНКО
Keyword(s):  
Chemical Composition ◽  
Quality Indicators ◽  
Raw Materials ◽  
Technological Properties ◽  
Drying Method ◽  
Drying Process ◽  
Protein Ratio ◽  
Drying Time ◽  
Tobacco Leaves ◽  
Tobacco Leaf

При производстве табачного сырья важную роль играет сокращение продолжительности сушки табачных листьев. Одним из способов интенсификации сушки свежеубранных табачных листьев является прием прорезания средней жилки (ПСЖ) листьев вдоль волокон. По результатам исследований 2019–2020 гг. была создана база данных табачного сырья, полученного при естественном способе сушки с применением приема ПСЖ, которая может служить информационным материалом для производителей табака. Проведена оптимизация процесса сушки табачного листа ПСЖ по показателям качества табачного сырья для расширенного диапазона сортотипов табака. Объектом исследований были сорта отечественной селекции, включенные в Государственный реестр селекционных достижений, допущенные к использованию: Самсун 85, Вирджиния 202, Юбилейный новый 142, Трапезонд 92, Трапезонд 204, Дюбек 33, Американ 287 и Крупнолистный Ильский (находится в стадии государственных испытаний). Критерием оценки эффективности применения приема ПСЖ на исследованных сортах табака являлся совокупный сравнительный анализ следующих показателей контрольных (без ПСЖ листа) и опытных образцов: уровень интенсификации сушки, показатели товарного качества, технологических свойств и химического состава полученного сырья. Установлено, что ПСЖ позволяет интенсифицировать процесс сушки в 1,3–2,46 раза в зависимости от сорта табака и положительно влияет на технологические свойства сырья, у большинства сортов увеличивается выход волокна и сохраняются объемно-упругие свойства. Динамика сушки оказывает влияние на изменение химического состава сырья. В процессе сушки за счет гидролизации солей никотина и его освобождения путем окисления кислородом воздуха уровень никотина в ряде образцов снижается в пределах 10–30%. Чем выше содержание никотина, тем выше крепость табака, грубее его вкус. Изменения углеводно-белкового соотношения в сторону повышения углеводов улучшают вкусовые характеристики сырья. По каждому исследованному сорту не удалось выявить закономерной зависимости его структуры и характера процесса сушки при ПСЖ с преобразованиями химического состава сырья. На основе анализа технологических и качественных показателей табачного сырья, представленных в разработанной базе данных по интенсификации сушки различных сортов табака с применением приема ПСЖ табачных листьев, можно планировать выбор оптимального способа сушки для каждого сорта табака, позволяющего повысить эффективность использования сырья и улучшить его качественные характеристики. In the production of tobacco raw materials, reducing the drying time of tobacco leaves plays an important role. One of the ways to intensify the drying of freshly harvested tobacco leaves is the method of cutting the middle vein (CMV) of the leaves along the fibers. Based on the results of research in 2019–2020, a database of tobacco raw materials obtained by a natural drying method using CMV reception was created, which can serve as information material for tobacco producers. The optimization of the process of drying the CMV tobacco leaf according to the quality indicators of tobacco raw materials for an expanded range of tobacco variety types was carried out. The object of research was the varieties of domestic selection included in the State Register of Breeding Achievements, approved for use: Samsun 85, Virginia 202, Yubileyny novy 142, Trapezond 92, Trapezond 204, Dubek 33, American 287 and Krupnolistnyy Ilskiy (under state testing). The criterion for evaluating the effectiveness of the use of CMV intake on the studied tobacco varieties was a cumulative comparative analysis of the following indicators of control (without CMV sheet) and experimental samples: the level of drying intensification, indicators of commercial quality, technological properties and chemical composition of the obtained raw materials. It is established that CMV allows to intensify the drying process by 1,3–2,46 times, depending on the tobacco variety and has a positive effect on the technological properties of raw materials, most varieties increase the yield of fiber and retain volume-elastic properties. The dynamics of drying affects the change in the chemical composition of raw materials. During the drying process, due to the hydrolysis of nicotine salts and its release by oxidation with air oxygen, the nicotine level in a number of samples decreases within 10–30%. The higher the nicotine content, the higher the strength of tobacco, it is coarser in taste. Changes in the carbohydrate-protein ratio in the direction of increasing carbohydrates improve the taste characteristics of raw materials. For each studied variety, it was not possible to identify a regular dependence of its structure and the nature of the drying process at CMV with transformations of the chemical composition of raw materials. Based on the analysis of technological and qualitative indicators of tobacco raw materials presented in the developed database on the intensification of drying of various varieties of tobacco using the use of CMV of tobacco leaves, it is possible to plan the choice of the optimal drying method for each variety of tobacco, which allows to increase the efficiency of using raw materials and improve its quality characteristics.

scholarly journals Composition and Biological Potential of Essential Oil from Thelechitonia trilobata Growing in South Africa

2011 ◽  
Vol 6 (12) ◽  
pp. 1934578X1100601
Author(s):  
Jamie Peebles ◽  
Ephraim Gwebu ◽  
Opeoluwa Oyedeji ◽  
Sarah Nanyonga ◽  
Nokuthula Kunene ◽  
...  
Keyword(s):  
South Africa ◽  
Chemical Composition ◽  
Essential Oil ◽  
Invasive Plant ◽  
Toxicity Tests ◽  
Contact Toxicity ◽  
Agricultural Pests ◽  
Biological Potential ◽  
Germacrene D ◽  
Positive Results

Thelechitonia trilobata is regarded as a troublesome weed that grows to form a dense blanket over the soil preventing the growth of other crops in farmland. Although the plant is regarded as a notorious, invasive plant, its chemical composition and biological potential have not been reported. The essential oil was isolated from the fresh leaves of T. trilobata using hydrodistillation. α-Pinene (21.6%), α-phellendrene (21.0%), limonene (12.8%) and germacrene D (7.5%) were the major constituents of the oil. The essential oil was screened against agricultural pests. The anti-tick properties were tested on Ripicephalus e. ervertsi found on sheep, while repellency, fumigation, and contact toxicity tests were carried out with maize weevils. Except for the contact toxicity test, all other bioassays gave positive results.

scholarly journals Proximate chemical composition and biological profile of fatty acids of Withania somnifera L dunal

2013 ◽  
Vol 7 (27) ◽  
pp. 2034-2039
Author(s):  
Uddin Ghias ◽  
Rauf Abdur ◽  
Gul Sumaira ◽  
Saleem Muhammad ◽  
Umar Salma ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Chemical Composition ◽  
Withania Somnifera ◽  
Biological Profile ◽  
Proximate Chemical Composition
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