Tunisian Milk Thistle: An Investigation of the Chemical Composition and the Characterization of Its Cold-Pressed Seed Oils

Pistacia lentiscus is an aromatic member of the Anacardiaceae family, endemic to the Mediterranean regions, which produces red and black oleaginous seeds in maturity. Our study focuses on the characterization of Pistacia lentiscus seed oils from three localities of High Atlas Mountain in the Azilal region of Morocco. Our results showed a very appreciable oil yield reaching more than 21% which clearly differs between the three sites studied (21.33 ± 0.17% in Boizoghrane, 15.22 ± 0.10% in Tighanimine, and 7.67 ± 0.29% in Tawjanizm locality); the analysis of the total fatty acids composition revealed a predominance of the unsaturated fatty acids represented essentially by the oleic and linoleic fatty acids, and also the triglyceride composition was dominated mainly by POO + SOL, POL + SLL + PoOP, and OOO. This potential of the chemical composition offers the possibility of producing nutraceutical oil, which represents a source of income capable of insisting vulnerable local populations to protect this species from deforestation, thus maintaining biodiversity, and to reduce by this interest the migratory flow from marginal areas.

Download Full-text

Physicochemical characterization of microcapsules containing cold pressed black cumin seed oils (Nigella sativa L.) as an alternative nutrient source in a functional diet

LWT ◽

10.1016/j.lwt.2021.113045 ◽

2021 ◽

pp. 113045

Author(s):

Najwa Yanya Santiworakun ◽

Acharee Suksuwan ◽

Sukrit Sirikwanpong ◽

Winai Dahlan ◽

Tipayanate Ariyapitipun

Keyword(s):

Nigella Sativa ◽

Physicochemical Characterization ◽

Seed Oils ◽

Nutrient Source ◽

Black Cumin ◽

Black Cumin Seed ◽

Cold Pressed ◽

Cumin Seed

Download Full-text

Processing and characterization of YBa2Cu3O7−x/Ag composites

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100173364 ◽

1990 ◽

Vol 48 (4) ◽

pp. 46-47

Author(s):

Jafar Javadpour ◽

Bradley L. Thiel ◽

Sarikaya Mehmet ◽

Ilhan A. Aksay

Keyword(s):

Composite System ◽

Precursor Solution ◽

Microstructural Development ◽

Superconducting Properties ◽

Practical Applications ◽

Nitrate Precursor ◽

Cold Pressed ◽

Tape Cast ◽

Composite Samples

Practical applications of bulk YBa2Cu3O7−x materials have been limited because of their inadequate critical current density (jc) and poor mechanical properties. Several recent reports have indicated that the addition of Ag to the YBa2Cu3O7−x system is beneficial in improving both mechanical and superconducting properties. However, detailed studies concerning the effect of Ag on the microstructural development of the cermet system have been lacking. Here, we present some observations on the microstructural evolution in the YBa2Cu3O7−x/Ag composite system.The composite samples were prepared by mixing various amounts (2.5 - 50 wt%) AgNO3 in the YBa2Cu3O7−x nitrate precursor solution. These solutions were then spray dried and the resulting powders were either cold pressed or tape cast. The microstructures of the sintered samples were analyzed using SEM (Philips 515) and an analytical TEM (Philips 430T).The SEM micrographs of the compacts with 2.5 and 50 wt% Ag addition sintered at 915°C (below the melting point of Ag) for 1 h in air are displayed in Figs. 1 and 2, respectively.

Download Full-text

Chemical composition of Azadirachta indica A. Juss and Ricinus communis Linn. seed oils growing in Marigat, Baringo County, Kenya

East African Journal of Science, Technology and Innovation ◽

10.37425/eajsti.1.2.88 ◽

2020 ◽

Vol 1 (2) ◽

Author(s):

Ann Kiplagat Jepkorir ◽

Charles Maina Irungu ◽

Philip Bett Kendagor

Keyword(s):

Chemical Composition ◽

Ricinoleic Acid ◽

Unsaturated Fatty Acids ◽

Ricinus Communis ◽

Methyl Esters ◽

Octadecenoic Acid ◽

Seed Oils ◽

Octadecanoic Acid ◽

Alkyd Resins ◽

Natural Remedies

All parts of A. indica (neem) and R. communis (castor) plants have mostly been used as natural remedies in the control and treatment of several ailments, control of pests and insects, animal feeds and production of industrial products globally. The seed oils of A. indica and R. communis are known to have antidiabetic, anti-helminthic, antifertility, antioxidant, antibacterial, anti-inflammatory, anti-cancer, insecticidal and mosquitocidal activity. This study reports for the first time the chemical composition of A. indica and R. communis seed oils from Marigat, Baringo County, Kenya. Seed oils of A. indica and R. communis were extracted from mature dried seeds through cold pressing and boiling respectively and chemical composition determined using Gas Chromatography (GC)-Mass Spectrometry (MS). The constituents of both seed oils were dominated by saturated and unsaturated fatty acids, cyclic esters and methyl esters. The predominant constituents of R. communis were (Z)-6-Octadecenoic acid (37.33%), Ricinoleic acid (30.22%) and 13-Hexyloxacyclotridec-10-en-2-one (26.67%) while those of A. indica were 2-hexyl-1-decanol (30.97%), Octadecanoic acid (29.69%) and Oxalic acid, 6-ethyloct-3-yl ethyl ester (15.55%). Oils contained Hexadecanoic acid and Octadecanoic acid which are used in the manufacture of several products such as candles, soaps, lotions, perfumes and cosmetics. Octadecenoic acid is important in control of human diseases and Ricinoleic acid in production of alkyd resins for surface coating and biofuel. From the results, A. indica and R. communis seed oils constituents have potential in the agricultural, industrial, comestics and pharmaceutical sectors but require further fractionation to isolate the bioactive compounds.

Download Full-text

Fractionation and characterization of lignin from waste rice straw: Biomass surface chemical composition analysis

International Journal of Biological Macromolecules ◽

10.1016/j.ijbiomac.2019.10.068 ◽

2020 ◽

Vol 145 ◽

pp. 795-803 ◽

Cited By ~ 6

Author(s):

Shubhangi De ◽

Shubham Mishra ◽

Elangovan Poonguzhali ◽

Mathur Rajesh ◽

Krishnamurthi Tamilarasan

Keyword(s):

Chemical Composition ◽

Rice Straw ◽

Composition Analysis ◽

Surface Chemical ◽

Surface Chemical Composition ◽

Chemical Composition Analysis

Download Full-text

Structural Factors Inducing Cracking of Brass Fittings

Materials ◽

10.3390/ma14123255 ◽

2021 ◽

Vol 14 (12) ◽

pp. 3255

Author(s):

Lenka Kunčická ◽

Michal Jambor ◽

Adam Weiser ◽

Jiří Dvořák

Keyword(s):

Chemical Composition ◽

Plastic Flow ◽

Beta Phase ◽

Alpha Phase ◽

Structural Factors ◽

Transmission Electron ◽

Medical Gas ◽

Hot Die Forging ◽

Multiple Step

Cu–Zn–Pb brasses are popular materials, from which numerous industrially and commercially used components are fabricated. These alloys are typically subjected to multiple-step processing—involving casting, extrusion, hot forming, and machining—which can introduce various defects to the final product. The present study focuses on the detailed characterization of the structure of a brass fitting—i.e., a pre-shaped medical gas valve, produced by hot die forging—and attempts to assess the factors beyond local cracking occurring during processing. The analyses involved characterization of plastic flow via optical microscopy, and investigations of the phenomena in the vicinity of the crack, for which we used scanning and transmission electron microscopy. Numerical simulation was implemented not only to characterize the plastic flow more in detail, but primarily to investigate the probability of the occurrence of cracking based on the presence of stress. Last, but not least, microhardness in specific locations of the fitting were examined. The results reveal that the cracking occurring in the location with the highest probability of the occurrence of defects was most likely induced by differences in the chemical composition; the location the crack in which developed exhibited local changes not only in chemical composition—which manifested as the presence of brittle precipitates—but also in beta phase depletion. Moreover, as a result of the presence of oxidic precipitates and the hard and brittle alpha phase, the vicinity of the crack exhibited an increase in microhardness, which contributed to local brittleness.

Download Full-text