A dihydropyridone alkaloid, cenocladamide, and a derivative of piplartine, 4'-desmethylpiplartine were isolated along with piplartine from the leaves of Piper cenocladum. The structures of the new compounds were determined by spectroscopic methods and by comparison to piplartine. Concentrations of these amides in plants with and without ant mutualists, are compared.

Black pepper is the one of most important export products in Vietnam. As the largest exporter, Vietnam’s pepper commodities account for 58% of total worldwide exporters. However, Vietnam’s pepper production is dealing with disease problems, especially foot rot/quick death infected by Phytophthora capsici. The disease results in serious and rapid spread and infection in Vietnam, with yearly redu...

The investigation of aroma compounds of the essential oils of dried fruits of black pepper (Piper nigrum) and black and white "Ashanti pepper" (Piper guineense) from Cameroon by means of solid-phase microextraction (SPME) was carried out for the first time to identify the odorous target components responsible for the characteristic odor of these valuable spices and food flavoring products. By m...

Two new sphingolipids, pipercerebrosides A (1) and B (2), were isolated from the leaves of Piper betle L. Their structures, including absolute configurations, were determined by spectroscopic analysis and chemical degradation. These two compounds did not show significant cytotoxic activity against the cancer cell lines K562 and HL-60 in a MTT assay.

The scientists at ALMPG Institute of Basic Medical Sciences, University of Madras, Chennai, India evaluated a combination of spices (Piper nigrum Linn., P. longum Linn. and Zingiber officinale Rosc.), herbs (Cyperus rotundus Linn. and Plumbago zeylanica Linn.) and salts make up Amrita Bindu for its possible antioxidant activity. The study was focused to evaluate the antioxidant property of indi...

A simple, rapid and efficient method has been developed for the isolation of piperine from the fruits of Piper nigrum. The method involves extraction of the fruit powder with glacial acetic acid, from which piperine is partitioned into chloroform and subsequently crystallized. The identity of the compound was confirmed by its melting point, comparison of IR, HNMR, XRPD, mass spectral and molecu...

As argued above, more-durable mulch species are desirable; but mixtures are feasible and might include a proportion of readily-decomposable foliage species such as Gliricidia sepium , which is very well-known throughout Central and South America . The research project reported here has trials of pepper ( Piper nigrum ) grown on living supports of this species, between hedgerows of Inga . The pe...

Soil microorganisms have important influences on plant growth and health. In this study, four black pepper fields consecutively monocultured for 12, 18, 28 and 38 years were selected for investigating the effect of planting age on rhizosphere and non-rhizosphere soil microbial communities and soil physicochemical properties. The results revealed that the relative abundance of the dominant bacte...