Pineapple waste at Promo Fruits Benin is bulky and difficult to manage. In addition, the company is dependent on electrical and thermal energy. With the aim of reducing waste and the energy bill, a technical-economic and environmental study was carried out. The methodology used is based on the analysis of energy needs, the study of recovery processes, economic and environmental analysis. The results showed that the company's annual energy consumption in electricity and diesel is 600 MWh and 307,695 liters respectively. The annual waste potential available is 11,607 T while that necessary to meet the company's energy needs is 14,904 T. The study of the choice of process retained biomethanation. The Functional Specifications of the reactor allowing said recovery has been defined and the digester has been sized. The economic study for a period of 25 years revealed that the investment cost is 2,101,196,208 FCFA and that the operating cost is 19,385,128 FCFA per year. In addition, the study made it possible to reduce from 96,434,691.12 FCFA to 0 FCFA the annual bill for electrical energy and from 123,078,750 FCFA to 71,898,186 FCFA for thermal energy of the company. From an environmental point of view, a reduction of 472.76 tonnes CO_2/year is obtained from emissions produced by non-recovered waste.

The objective of this study is to study the phytochemistry of the anti-bacterial activity of thirteen plants used in traditional medicine to treat typhoid fever in Benin. For this fact, we carried out the phytochemical screening, then the antibacterial activity was carried out by the micro-dilution method. The dosage of polyphenols was made on the extracts having exhibited good anti-salmonella activity. Phytochemical screening has revealed the presence of alkaloids, tannins (gallic and catechic) and flavonoids for all plants, as for other secondary metabolites, they vary from one plant to another. For the forty-five [H2O, EtOH (96%), CH2Cl2-MeOH (V / V)] extracts, the extraction yield ranged from 3.3% to 23.78%; the CH2Cl2-MeOH extracts have the best yields followed by ethanolic extracts. The evaluation of the anti-salmonella activity of the forty-five extracts on seven strains of Salmonella (clinical isolate and reference) made it possible to determine the minimum inhibitory concentration (MIC) of the active extracts following the biological screening. The ethanolic extract of Zanthoxylum zanthoxyloides and CH2Cl2-MeOH from Azadirachta indica are the most active in inhibiting four types of salmonella with MICs ranging from 250 to 500 μg / mL. The determination of the polyphenol contents showed the richness of these plants in these compounds and we noticed that the activity of the extracts varies according to their content of flavonoids. The results obtained confirmed the anti-salmonella potential of certain plants at the concentration tested and constitute a scientific database for the research of phytomedicines.

The use of biodegradable food packaging plants could provide an alternative to plastic packaging, particularly for some traditional foods. This work aims to investigate the species of plant leaves used as food packaging in the food crafts in West Africa through their domestication. Data on different species of plant leaves have been collected through a survey among 8 municipalities in Benin using tools and methods based on focus groups. The criteria to select priority species for domestication have been identified from the pair wise comparison of plant species identified in each locality, using standard method. A larval toxicity test was performed on the main species to ensure their safety for domestication. A total of 43 plant species belonging to 29 families have been identified. From them, about 20% was domesticated and 80% were grown naturally. A total of 21.5% of natural species are in the way to be domesticated from which ten (10) have been identified as priority, non-toxic with domestication level varying between 2 (Acceptable level) and 3 (High level). These species include Thalia geniculata, Siphonochilus aethiopicus, Sarcocephalus latifolius, Cyrtosperma senegalense, Daniellia oliveri, Agyrea nervosa (High level of domestication) and Ampelocissus leonensis, Isoberlinia doka, Sterculia tragacantha, Icacina trichantha (Acceptable level of domestication). Due to the benefits that provide these species, particularly their biodegradability, it should be wonderful to develop an intensive policy of domestication for their sustainable use.