Neem tree (Azadirachta Indica), native to the Indian subcontinent, is known as a versatile plant, rich source of bioactive compounds such as azadirachtin, nimonol, nimocinol, nimocinolide, gallic acid, gallocatechin, epicatechin, azadiradione, nimbin, salannin, epoxyazadiradione, etc. The isolated from neem phytochemicals, among other, are more than 300. The present work details the techniques for extracting compounds from different parts of neem, such as bark, husk seed, seed, seeds oil, tree, leaves, and flowers. Furthermore, it comments on the various applications, including medicinal, environmental, and veterinary of the neem-derived bioactive compounds, as well as their use in cattle raising and in cosmetics, disinfectants, rubber, and textile production, on the basis of a systematic documentary analysis from 2019 onwards.

The present research features an experimental comparative design and the objective of this work was to determine the susceptibility to microbiological contamination in fatty acid methyl esters (FAMEs) and the FAME–water interface of residual and refined lard, large volume simulating storage conditions as fuel supply chain, and to identify the microorganisms developed. The plates were seeded according to ASTM E-1259 and the instructions provided by the manufacturer of the Bushnell Haas agar. Microbiological growth was observed at the FAME–water interface of FAME obtained from residual lard. Using the MALDI-TOF mass spectrometry technique, Pseudomonas aeruginosa and Streptomyces violaceoruber bacteria were identified in the residual lard FAMEs, with the latter being previously reported in FAMEs. The implications of microorganism development on the physicochemical quality of FAMEs are significant, as it leads to an increase in the acid index, which may negatively impact metals by inducing corrosion. The refined lard FAMEs did not show any development of microorganisms. The present research concluded that residual lard tends to be more prone to microbiological attack if the conditions of water and temperature affect microbial growth. The findings will contribute to the knowledge base for a safer introduction of FAMEs into the biofuel matrix.