By T. Elmqvist (auth.), Lars Bohlin, Jan G. Bruhn (eds.)

Bioassay equipment in traditional Product examine and Drug Development includes the court cases from the Phytochemical Society of Europe's very winning symposium in this subject, held August 24-27, 1997 in Uppsala, Sweden.
during this quantity, best educational and commercial scientists talk about novel equipment for assaying usual items to discover new structure-activity relationships. Of key significance during this strategy is the provision and reliability of particular bioassay tools, yet chapters additionally speak about chemical and organic range and the way to dereplicate average product extracts to extend potency in lead discovery.
Anti-tumor, HIV-inhibitory, antiprotozoal, anti-infective and immunomodulatory typical items are mentioned. numerous business initiatives are provided for the 1st time.
This quantity bridges the distance among educational and commercial learn and scientists, and will be required interpreting in drug businesses and schools of pharmacy, in addition to serving scientists in pharmacognosy, pharmacology, phytochemistry, usual items and drug discovery.

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J. VLIETINCK known agents in this therapeutic indication should be distinguishable from effects of drugs for other indications [6]. It is clear that the degree of relevance increases from subcellular systems (molecular assays) to cellular systems (cellular assays). to organs up to conscious animals and human volunteers. Although considerable discussion is going on about the necessity of animal experiments. it is without any doubt that they are necessary for the discovery and evaluation of drugs.

In a prescreen a bioassay is applied to large numbers of initial samples to determine whether or not they have any bioactivity of the desired type. Such bioassays must have high capacity, low cost and must give rapid answers. They need not be quantitative. A bioassay in a screen is used to select materials for secondary testing, whereas in a monitor a bioassay is used to guide fractionation of a crude material towards isolation of the pure bioactive substances. It must, therefore, be fast and cheap, have high capacity and be readily available to the phytochemist.

2 .... 5 .... 5 .... 20 10 o o 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 Figure 3. FAB Mass Spectra of Cytotoxic Fractions from Axinella aplysinoides cf. ; b) ~ - 20 min. -::-.... -- HO o OMe 4. Discussion We have concluded that there is no single or universal scheme for dereplication. Some decisions or choices would appear to be obvious. For example. if one were to screen plant extracts for virtually any bioactivity in vitro, a dereplication for tannins should be presumed necessary.

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