Researches for natural antioxidants that play an important role in the prevention of diseases linked to free radicals ha</span><span style="font-family:Verdana;">ve</span><span style=&qu...Researches for natural antioxidants that play an important role in the prevention of diseases linked to free radicals ha</span><span style="font-family:Verdana;">ve</span><span style="font-family:Verdana;"> increased in recent years. In this study, antioxidant activity of </span><span style="font-family:Verdana;"><i></span><i><span style="font-family:Verdana;">Bauhinia rufescens</span></i><i><span style="font-family:Verdana;"></i></span></i><i><span style="font-family:""> </span></i><span style="font-family:""><span style="font-family:Verdana;">Lam which is a medicinal plant</span><i> </i><span style="font-family:Verdana;">was investigated</span><i><span style="font-family:Verdana;">.</span></i><span style="font-family:Verdana;"> The methanol extract, acetone extract and water extract of leaf and trunk bark had antioxidant activity. Three methods were used: 2,2-diphenyl-1picryl-hydrazyl (DPPH), 2,2</span></span><span style="font-family:Verdana;">’</span><span style="font-family:Verdana;">-Azino-bis-(3-ethylbenzoth</span><span style="font-family:""> </span><span style="font-family:Verdana;">iazoline-6-sulfonic acid) (ABTS) and ferric ion reducing power (FRAP) by spectrophotometr</span><span style="font-family:Verdana;">y</span><span style="font-family:Verdana;">. Phytochemical screening was carried out followed by the quantification of the total phenolic by the Folin-Ciocalteu method. The analysis of variance (ANOVA) with the STATISTICA 7.1 software revealed significant differences (p</span><span style="font-family:""> </span><span style="font-family:Verdana;"><</span><span> </span><span style="font-family:Verdana;">0.05). Percentage inhibition (PI) and IC</span><sub><span style="font-family:Verdana;">50</span></sub><span style="font-family:""><span style="font-family:Verdana;"> of the extracts were obtained using the OriginPro 8.5 software. These tests show that the bark is as rich in total phenolic as the leaves. The DPPH test shows that at 2.5 mg/ml, the bark and the leave have similar activity. Bark has a pe展开更多
Saba senegalensis is a popular wild fruit;which is consumed as such or transformed into various products. Despite its economic potential, its nutritional potential is unknown. The objective of this study is to charact...Saba senegalensis is a popular wild fruit;which is consumed as such or transformed into various products. Despite its economic potential, its nutritional potential is unknown. The objective of this study is to characterize its fruits according to Senegal’s main production areas. The study included five samples from five geographical areas of Senegal. Parameters measured include pH, protein, lipids, ash, moisture, vitamin C, carotenoids, polyphenols, minerals, and sugars. The results showed that for moisture, proteins, lipids, pH and reducing sugars did not differ significantly (p 0.05%) for all accessions. Vitamin C content varies between 32.86 and 198.22 mg·100g<sup>-</sup><sup>1</sup>, carotenoids with a content of between 5.05 and 9.12 mg·100g<sup>-</sup><sup>1</sup>;polyphenol contents are between 1.17 and 2.56 g·100g<sup>-</sup><sup>1</sup>. The nutritional value of Saba fruits appears to be homogeneous in Senegal. A thorough study of the functional molecules seems necessary for a better appreciation of the potential of this fruit.展开更多
In this study, the influence of provenance and extraction methods on the physicochemical properties and the antioxidant potential of M. charantia seeds oil were evaluated. The oil is obtained on the one hand by cold e...In this study, the influence of provenance and extraction methods on the physicochemical properties and the antioxidant potential of M. charantia seeds oil were evaluated. The oil is obtained on the one hand by cold extraction with hexane and on the other hand by hot extraction with soxhlet. The results obtained show that the extraction yield is significantly impacted by the extraction methods and the origin of the seeds. In addition, the soxhlet extraction gives a higher oil yield (32.07 ± 0.01). Cold extraction has made it possible to obtain oils with less attenuated physicochemical characteristics. Indeed, the acid numbers are high in the oils extracted by soxhlet (5.92 ± 0.25;4.25 ± 0.62 and 13.86 ± 0.83) than in those cold extracted with very low peroxide for all the oils obtained. On the other hand, the iodine and refractive indices are high in oils obtained cold (91.58 ± 0.85;100.74 ± 0.03 and 102.08 ± 0.28) (1.53 ± 0.01;1.52 ± 0.01 and 1.52 ± 0.01) with low saponification indices. The polyphenol concentrations and the anti-free radical activity are higher with the oils obtained cold (0.086 ± 0.001;0.08 ± 0.000 and 0.09 ± 0.01 mgEAG/g of oil) and (DPPH) (55.75% ± 1.16%;55.03% ± 0.72% and 56.35% ± 0.45%). The color parameters (L*, a* and b*) of the different oils extracted also vary depending on the extraction method used. Principal Component Analysis (PCA) and correlation analysis were performed on the physicochemical properties and the antioxidant potential of the extracted oils. Therefore, the results suggest cold extraction to obtain a good quality and oxidation resistant oil.展开更多
In Africa, traditional vegetable oil extraction often involves the use of plants in the manufacturing process. <span style="font-family:Verdana;"><span style="font-family:Verdana;"><...In Africa, traditional vegetable oil extraction often involves the use of plants in the manufacturing process. <span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"><i></i></span></span></span><i><span style="font-family:Verdana;"><span style="font-family:Verdana;"><i><span style="font-family:Verdana;">Quassia undulate</span></i></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><i><span style="font-family:Verdana;"></span></i></span></span></i><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"> oil is thus traditionally prepared. An expedition went to Kédougo (a region in southeastern Senegal involving women of the Bassaris community) in June 2018 to study the </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"><i></i></span></span></span><i><span style="font-family:Verdana;"><span style="font-family:Verdana;"><i><span style="font-family:Verdana;">Q</span></i></span></span><span><span><span style="font-family:;" "=""><span style="font-family:Verdana;">.</span><i><span style="font-family:Verdana;"> undulate</span></i></span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><i><span style="font-family:Verdana;"></span></i></span></span></i><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"> oil traditional extraction mode. Thus, the objective of this study is to follow the traditional extraction of </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"><i></i></span></span></span><i><span style="font-family:Verdana;"><span style="font-family:Verdana;"><i><span style="font-family:Verdana;">Q</span></i></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">.</span></span></span><span><spa展开更多
Quassia undulata is a plant that belongs to the Simaroubaceae family. In Africa, it occurs in the wooded savannah from Senegal in the west to the Central African Republic in the east. The seeds from the plant are very...Quassia undulata is a plant that belongs to the Simaroubaceae family. In Africa, it occurs in the wooded savannah from Senegal in the west to the Central African Republic in the east. The seeds from the plant are very rich in oil. The traditional extraction of this oil involves a phase of boiling the powder from the seeds in a decoction of Piliostigma thonningii leaves. Thus, the aim of this study is to determine the impact of Piliostigma thonningii leaves on the extraction yield, to assess the phytochemical profile of seeds and oilcake and, to determine the nutritional value of the cakes obtained after extraction. Thus, the traditional extraction of oil was carried out in the laboratory and physico-chemical and phytochemical analyses were carried out on the water decoction, the oil and, the oilcake. The results showed that the traditional extraction gives a low extraction yield (5.18% with PD and 6.12% without PD) compared to the Soxhlet extraction (56.9%). On the other hand, it was found that oil obtained by traditional extraction in the presence of Piliostigma thonningii leaves was of better physicochemical quality. Finally, oilcake very rich in proteins (36.71% - 42.69%) and mineral elements (110.9 - 152.33 mg/100g of calcium, 544.75 - 620.77 mg/100g of Potassium and 331.11 - 459.68 mg/100g of Magnesium) justify their use in human food. However, investigations should point to the impact of this traditional technique on the elimination of quassinoids, toxins and antihelminth compounds present in the seeds.展开更多
文摘Researches for natural antioxidants that play an important role in the prevention of diseases linked to free radicals ha</span><span style="font-family:Verdana;">ve</span><span style="font-family:Verdana;"> increased in recent years. In this study, antioxidant activity of </span><span style="font-family:Verdana;"><i></span><i><span style="font-family:Verdana;">Bauhinia rufescens</span></i><i><span style="font-family:Verdana;"></i></span></i><i><span style="font-family:""> </span></i><span style="font-family:""><span style="font-family:Verdana;">Lam which is a medicinal plant</span><i> </i><span style="font-family:Verdana;">was investigated</span><i><span style="font-family:Verdana;">.</span></i><span style="font-family:Verdana;"> The methanol extract, acetone extract and water extract of leaf and trunk bark had antioxidant activity. Three methods were used: 2,2-diphenyl-1picryl-hydrazyl (DPPH), 2,2</span></span><span style="font-family:Verdana;">’</span><span style="font-family:Verdana;">-Azino-bis-(3-ethylbenzoth</span><span style="font-family:""> </span><span style="font-family:Verdana;">iazoline-6-sulfonic acid) (ABTS) and ferric ion reducing power (FRAP) by spectrophotometr</span><span style="font-family:Verdana;">y</span><span style="font-family:Verdana;">. Phytochemical screening was carried out followed by the quantification of the total phenolic by the Folin-Ciocalteu method. The analysis of variance (ANOVA) with the STATISTICA 7.1 software revealed significant differences (p</span><span style="font-family:""> </span><span style="font-family:Verdana;"><</span><span> </span><span style="font-family:Verdana;">0.05). Percentage inhibition (PI) and IC</span><sub><span style="font-family:Verdana;">50</span></sub><span style="font-family:""><span style="font-family:Verdana;"> of the extracts were obtained using the OriginPro 8.5 software. These tests show that the bark is as rich in total phenolic as the leaves. The DPPH test shows that at 2.5 mg/ml, the bark and the leave have similar activity. Bark has a pe
文摘Saba senegalensis is a popular wild fruit;which is consumed as such or transformed into various products. Despite its economic potential, its nutritional potential is unknown. The objective of this study is to characterize its fruits according to Senegal’s main production areas. The study included five samples from five geographical areas of Senegal. Parameters measured include pH, protein, lipids, ash, moisture, vitamin C, carotenoids, polyphenols, minerals, and sugars. The results showed that for moisture, proteins, lipids, pH and reducing sugars did not differ significantly (p 0.05%) for all accessions. Vitamin C content varies between 32.86 and 198.22 mg·100g<sup>-</sup><sup>1</sup>, carotenoids with a content of between 5.05 and 9.12 mg·100g<sup>-</sup><sup>1</sup>;polyphenol contents are between 1.17 and 2.56 g·100g<sup>-</sup><sup>1</sup>. The nutritional value of Saba fruits appears to be homogeneous in Senegal. A thorough study of the functional molecules seems necessary for a better appreciation of the potential of this fruit.
文摘In this study, the influence of provenance and extraction methods on the physicochemical properties and the antioxidant potential of M. charantia seeds oil were evaluated. The oil is obtained on the one hand by cold extraction with hexane and on the other hand by hot extraction with soxhlet. The results obtained show that the extraction yield is significantly impacted by the extraction methods and the origin of the seeds. In addition, the soxhlet extraction gives a higher oil yield (32.07 ± 0.01). Cold extraction has made it possible to obtain oils with less attenuated physicochemical characteristics. Indeed, the acid numbers are high in the oils extracted by soxhlet (5.92 ± 0.25;4.25 ± 0.62 and 13.86 ± 0.83) than in those cold extracted with very low peroxide for all the oils obtained. On the other hand, the iodine and refractive indices are high in oils obtained cold (91.58 ± 0.85;100.74 ± 0.03 and 102.08 ± 0.28) (1.53 ± 0.01;1.52 ± 0.01 and 1.52 ± 0.01) with low saponification indices. The polyphenol concentrations and the anti-free radical activity are higher with the oils obtained cold (0.086 ± 0.001;0.08 ± 0.000 and 0.09 ± 0.01 mgEAG/g of oil) and (DPPH) (55.75% ± 1.16%;55.03% ± 0.72% and 56.35% ± 0.45%). The color parameters (L*, a* and b*) of the different oils extracted also vary depending on the extraction method used. Principal Component Analysis (PCA) and correlation analysis were performed on the physicochemical properties and the antioxidant potential of the extracted oils. Therefore, the results suggest cold extraction to obtain a good quality and oxidation resistant oil.
文摘In Africa, traditional vegetable oil extraction often involves the use of plants in the manufacturing process. <span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"><i></i></span></span></span><i><span style="font-family:Verdana;"><span style="font-family:Verdana;"><i><span style="font-family:Verdana;">Quassia undulate</span></i></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><i><span style="font-family:Verdana;"></span></i></span></span></i><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"> oil is thus traditionally prepared. An expedition went to Kédougo (a region in southeastern Senegal involving women of the Bassaris community) in June 2018 to study the </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"><i></i></span></span></span><i><span style="font-family:Verdana;"><span style="font-family:Verdana;"><i><span style="font-family:Verdana;">Q</span></i></span></span><span><span><span style="font-family:;" "=""><span style="font-family:Verdana;">.</span><i><span style="font-family:Verdana;"> undulate</span></i></span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><i><span style="font-family:Verdana;"></span></i></span></span></i><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"> oil traditional extraction mode. Thus, the objective of this study is to follow the traditional extraction of </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"><i></i></span></span></span><i><span style="font-family:Verdana;"><span style="font-family:Verdana;"><i><span style="font-family:Verdana;">Q</span></i></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">.</span></span></span><span><spa
文摘Quassia undulata is a plant that belongs to the Simaroubaceae family. In Africa, it occurs in the wooded savannah from Senegal in the west to the Central African Republic in the east. The seeds from the plant are very rich in oil. The traditional extraction of this oil involves a phase of boiling the powder from the seeds in a decoction of Piliostigma thonningii leaves. Thus, the aim of this study is to determine the impact of Piliostigma thonningii leaves on the extraction yield, to assess the phytochemical profile of seeds and oilcake and, to determine the nutritional value of the cakes obtained after extraction. Thus, the traditional extraction of oil was carried out in the laboratory and physico-chemical and phytochemical analyses were carried out on the water decoction, the oil and, the oilcake. The results showed that the traditional extraction gives a low extraction yield (5.18% with PD and 6.12% without PD) compared to the Soxhlet extraction (56.9%). On the other hand, it was found that oil obtained by traditional extraction in the presence of Piliostigma thonningii leaves was of better physicochemical quality. Finally, oilcake very rich in proteins (36.71% - 42.69%) and mineral elements (110.9 - 152.33 mg/100g of calcium, 544.75 - 620.77 mg/100g of Potassium and 331.11 - 459.68 mg/100g of Magnesium) justify their use in human food. However, investigations should point to the impact of this traditional technique on the elimination of quassinoids, toxins and antihelminth compounds present in the seeds.
