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Selenium Content and Antioxidant Potential of Some Edible Wild Mushrooms from Bandundu Area, DR Congo

Natural Resources 2017年第2期8卷 103-113页

作者： Marina Kisuba Kabuyi Paulin Mutwale Kapepula Jimmy Kabeya Kabengele Bénédicte Moni Gisèle Makengo Patricia Mbombo Mungitshi Adam Tujibikila Mukuta Clement Mbadiko Mutunda Simon Dibaluka Mpulusu Jean Paul Koto-Te-Nyiwa Ngbolua Nadège Ngombe Kabamba théophile mbemba fundu Research Laboratory of Food and Nutrition (LARAN) Department of Biology Faculty of Science University of Kinshasa Kinshasa XI Democratic Republic of the Congo Centre d’Etudes des Substances Naturelles d’ Origine Vé gé tale (CESNOV) Faculty of Pharmaceutical Sciences University of Kinshasa Kinshasa XI Democratic Republic of Congo Department of Biology Faculty of Science University of Kinshasa Kinshasa XI Democratic Republic of the Congo

Nutrition is an important aspect of public health because it is linked to many significant diseases and health problems. this work is part of the promotion of traditional foods from the Democratic Republic of Congo in general and in the province of Bandundu, in particular by assessing the selenium content and the antioxidant capacity of wild edible mushrooms. Methanolic extracts from selected mushrooms were characterized for their chemical fingerprint by TLC and their in vitro antioxidant activities using ABTS, DPPH assays. Phytochemical screening revealed the presence of alkaloids, free amines, steroids and terpenes in all species. However, Auricularia delicata and Pleurotus tuberregium contain flavonoids. All extracts displayed a good radical-scavenging activity at the concentration range 1 - 300 μg/mL in the following order: Auricularia delicata > Lentinus cf cladopus > Pleurotus tuberregium > Marasmius buzungolo > Schizophillum commune. Studied mushrooms showed the interest quantity of selenium and L. cf cladodus had the highest concentration. Moderate selenium content of these wild mushrooms associated with their important antioxidant activities could provide health benefits to Bandundu’s populations in protecting against oxidative damage under different conditions including konzo.

关键词： Antioxidant Activity Auricularia delicata Lentinus cf cladopus Marasmius buzungolo Pleurotus tuberregium Schizophyllum commune Selenium Traditional Food

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Peroxidase Inhibition and Antioxidant Activity of Bulk-Marketed Black Tea (<i>Camellia sinensis</i>L.) from the Democratic Republic of the Congo

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Journal of Biosciences and Medicines 2019年第9期7卷 66-80页

作者： Nadege Ngombe Kabamba Joyce Mbuyi Katalayi Jimmy Kabeya Kabengele Grace Nkakapen Djoumbissi Marie Joe Kabongo Kapinga thé ophile mbemba fundu Dieudonné Tshitenge Tshitenge Pascal Dibungi T. Kalenda Paulin Mutwale Kapepula Centre d’Etudes des Substances Naturelles d’Origine Vé gé tale (CESNOV) Faculty of Pharmaceutical Sciences University of Kinshasa Kinshasa The Democratic Republic of the Congo Laboratoire d’Analyses et de Recherche en Alimentation et Nutrition (LARAN) Department of Biology Faculty of Sciences University of Kinshasa Kinshasa The Democratic Republic of the Congo

the widely known leaves of Camellia sinensis (L.) derive the most consumed beverage globally. All over the world, like in the Democratic Republic of the Congo (DR Congo), they are marketed in the form of packaged and in bulk black tea. the aim of this study was to report the microscopic botanical features, the chromatographic fingerprints, the antioxidant activities, and the peroxidase inhibition of bulk-marketed black teas consumed in DR Congo. the microscopic analysis of powders from unpackaged black tea marketed in DR Congo allowed the identification of specific microscopical features, which are characteristic to C. sinensis (L.) such as numerous asterosclerites, numerous fragments of unicellular trichomes;fragments of abaxial epidermis consisting of cells with slightly wavy walls, numerous anomocytic stomata, and the detection of biological contaminants, e.g. the dust mites. TLC and HPLC analysis indicated that flavonoids (hyperoside, rutin) and phenolic acids (chlorogenic acid, gallic acid) were major phenolic compounds, along with other secondary metabolites. Aqueous extracts from all bulk-marketed black teas exhibited good antioxidant activities at the concentrations range of 1 - 20 μg·mL-1 using in vitro ABTS and DPPH assays. these extracts showed equally inhibitory effects on myeloperoxidase (MPO) and horseradish peroxidase (HRP) activities at the concentration ranges of 1 - 20 μg·mL-1 and 20 - 100 μg·mL-1 respectively. Bulk-marketed black teas consumed in DR Congo possess antioxidant and anti-inflammatory properties comparable to packaged Ceylon tea largely marketed. the observed bioactivities support the health benefits of the consumed black tea by Congolese people, despite the storage conditions to be improved in order to preserve its nutritional and therapeutic assets.

关键词： Antioxidant Activity Black Tea Camellia sinensis HRP L-012 Mites Myeloperoxidase

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