Effect of an Extract from Evening-Primrose Seeds on Postprandial Blood Glucose Level and Its Active Components

Quantitative Analysis of Biologicaly Active Polyphenols in Evening Primrose (Oenothera Paradoxa) Seeds Aqueous Extracts

“…In O. biennis defatted seeds extract the quantity of gallic acid was similar and reached 4.13 mg/g, while that of (+)-cathechin was higher and reached 101 mg/g [Wettasinghe et al, 2002a]. In turn, Aitani et al [2003] detected in ethanolic extract from defatted seeds of O. biennis 27 mg/g of pentagalloylglucose, 31 mg/g of gallic acid and 34 mg/g of (+)-cathechin.…”

“…In O. biennis seeds extract Wettasinghe et al [2002a] showed that gallic acid and (+)-catechin were the main compounds responsible for its antioxidative activity. Additionally, Aitani et al [2003] detected the presence of pentagalloylglucose, procyanidin B 3 and procyanidin B 1 in an ethanolic extract from defatted seeds of O. biennis. The contents of total phenolics and procyanidins in the extracts during seeds storage varied from 469 to 388 mg/g and from 436 to 372 mg/g, respectively.…”

Anti-obesity effects of highly polymeric proanthocyanidins from seed shells of Japanese horse chestnut (Aesculus turbinata Blume)

“…These doses were the levels comparable to those used in other reports. For example, Aitani et al described that the extracts from evening-primrose seeds at doses of 500-1000 mg/kg mouse attenuated effectively the elevation of blood glucose after loading of sucrose (Aitani et al, 2003). Moreover, extracts of guava leaves at 500 mg/kg mouse have been shown to suppress the development of diabetes in the db/db mouse and the postprandial blood glucose of human subjects (Deguchi et al, 1998).…”

Effects of planting beds, nutrient treatment and drought stress on biochemical properties and vegetative traits of common evening primrose (Oenothera biennis L.) seeds

“…Considering that the physical and chemical properties of humic acid in vermicompost increase the nitrogen accumulation by the plant, it is not unexpected that the amount of oil decreases with increasing levels of vermicompost, because by increasing nitrogen content, the formation of nitrogenous protein foregrounds can be increased. Therefore, the formation of protein in the production of photosynthetic materials is increased and as a result, the amount of available material for the synthesis of fatty acids is decreased (Aitani, et al, 2003). Salehi et al (2011) using different levels of vermicompost on German chamomile, expressed the increase in essential oil percentage and its yield in accordance with increasing the level of this fertilizer, and stated that with increasing vermicompost content, in addition to increasing the required nutrients, the physical conditions and vital processes of soil are improved and a suitable bed for root growth is provided, that increases the production of dry matter, flower yield and essential oil content.…”

“…Using vegetable oils in traditional medicine is very common and they are used in the treatment of physiological diseases and prevention of infection (Hu, et al, 2015). Evening primrose seed oil is used to deal with fat accumulation in the body, diabetes, premenstrual syndrome (PMS), and other diseases, including eczema, mastalgia, cancer, multiple sclerosis, rheumatism, and high levels of cholesterol (Aitani, et al, 2003;Deng, et al, 2001;Sekeroglu and Ozguven, 2006). Although compared to the oil of this plant, the existence of other compounds in it has been underestimated, recent studies have confirmed the presence of antioxidant activity in the polyphenols in evening primrose seeds (Balasinska, B. and Troszynska, 1998;Birch, et al, 2002;Kulkarni and Deshpande, 2007;Wettasinghe, et al, 2002;Wettasinghe, et al, 1999;Wettasinghe, et al, 2000).…”