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Sasanka Chandra Bhattacharyya

Bio: Sasanka Chandra Bhattacharyya is an academic researcher from National Chemical Laboratory. The author has contributed to research in topics: Absolute configuration & Lactone. The author has an hindex of 20, co-authored 66 publications receiving 1164 citations.

Papers published on a yearly basis

Papers
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Journal ArticleDOI
TL;DR: In this paper, three sesquiterpenic furanoids of the selinane group were isolated from agarwood oil, obtained from the fungus infected plant Aquillaria agallocha Roxb.

74 citations

Journal ArticleDOI
TL;DR: Costunolide, the new sesquiterpene lactone isolated from costus root oil (Saussurea lappa Clarke) is shown to have the structure I on the basis of dehydrogenation, ozonolyses and the formation of santanolide 'C' under mild conditions.

71 citations

Journal ArticleDOI
TL;DR: Agarospirol (Ia) as discussed by the authors is a sesquiterpene alcohol isolated from the essential oil of infected agarwood (Aquilaria agallocha Roxb.).

64 citations

Journal ArticleDOI
TL;DR: Two terpenic coumarins, oroselol and jatamansin, have been isolated from the oil obtained from the roots of Nardostachys jatamsi.

63 citations


Cited by
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Journal ArticleDOI
TL;DR: This review summarizes the present knowledge regarding the biological activities of sesquiterpene lactones and their structure-activity relationships and suggests their evolutionary significance in plants as deterrents against herbivores and anti-fungal, anti-bacterial allelopathic agents.

552 citations

Journal ArticleDOI
TL;DR: The tribal, subtribal and generic distribution of sesquiterpene lactones is examined, the compounds’ utility as taxonomic characters discussed and the biogenetically based methodology shows the efficacy of this analytical methodology.
Abstract: The Asteraceae is characterized by structurally diverse sesquiterpene lactones and furanosesquiterpenes. In this review the tribal, subtribal and generic distribution of sesquiterpene lactones is examined and the compounds’ utility as taxonomic characters discussed. Sesquiterpene lactones fulfill the major requirements for good analytic and synthetic characters. Studies of infraspecific sesquiterpene lactone variation indicate that different elements within complex taxa are often defined by distinct chemistries, termed chemotypes. Chemotypes have been identified within many of the thoroughly investigated taxa:Ambrosia camphorata, A. chamissonis, A. confertiflora, theA. cumanensis-A. psilostachya-A. artemisiifolia complex,A. dumosa, Artemisia tridentata, Gaillardia pulchella andMelampodium leucanthum. Such an analytic usage is mostly restricted to the infraspecific level. Synthetic usage at the interspecific level and above profits from the application of a biogenetically based methodology for sorting out the complex molecules’ carbon-skeletal and substitutional features into unit characters. Cladistics or Hennigian phylogenetic systematics provides a useful framework for such an analysis. Preliminary surveys indicate that sesquiterpene lactones are especially good characters for differentiating subtribes within several major tribes: the Vernonieae, Heliantheae and Mutisieae. As yet, too few data are available for other tribes to discern such patterns. Species surveys inVernonia, Ambrosia, Iva, Parthenium,Tetragonotheca andArtemisia demonstrate that sesquiterpene lactones are useful in discerning infrageneric groups. The biogenetic cladistic analysis of the interspecific sesquiterpene lactone variation inIva shows the efficacy of this analytical methodology. At present, such biogenetically based approaches are impeded by limited biosynthetic evidence and the erratic distribution of sesquiterpene lactones within the family. Instances of apparent displacement of sesquiterpene lactones by other terpenoids (i.e. sesquiterpene furans, alcohols and acids, diterpenes, diterpene acids, etc.) at various taxonomic levels suggest that ultimately sesquiterpene lactones must be interpreted as taxonomic characters in the context of the family’s total terpene chemistry. All taxa from which sesquiterpene lactones have been reported are listed together with the compound names, major structural features and the literature cited. A less-complete listing is provided for taxa producing furanosesquiterpenes. Structures for all reported compounds are included. Two appendices listing alphabetically taxa and compounds and relevant text page numbers permit cross-indexing of plants and compounds.

350 citations

Journal ArticleDOI
TL;DR: This monograph, published in two parts, comprehensively reviews production, trade, processing, chemistry, and evaluation of quality of ginger.
Abstract: Ginger is used in more ways than any other spice. This monograph, published in two parts, comprehensively reviews production, trade, processing, chemistry, and evaluation of quality. Botany, world varieties, agronomy, crop improvement and potential are reviewed briefly with emphasis on the yield of functional components. Processing for the market, international trade patterns, and factors influencing them are discussed. Derived products such as ginger powder, syruped ginger, volatile oil, and oleoresin are discussed in greater detail. The increasing world demand for quality products of added value such as the oleoresin and volatile oil show prospects for their production in the growing countries. The chemistry of the components which contribute aroma and pungency that characterize ginger is critically reviewed. The second part deals with evaluation of quality. The physico-chemical parameters prescribed as a measure of quality for ginger and its products in the existing standards can assure only hygienic quality and purity, and possibly the source, when new parameters such as GC-fingerprints are included. The importance of sensorily evaluating flavor quality is emphasized to understand the variation in flavor quality required by the industrial and retail markets. Related areas, such as problems in sensory evaluation of intense flavored substances, objective flavor profile analysis, and correlation of instrumental and sensory data, are discussed and our recent work in this area is summarized. Areas where more research are needed are indicated. Other areas briefly discussed are functional, physiological, and toxicological properties in use of ginger; biosynthetic aspects of the components stimulating flavor; and structure and pungency and chemistry of spices from allied species and genera. A comprehensive bibliography is provided to aid in further study and research.

339 citations

Journal ArticleDOI
TL;DR: A compilation of the volatile and semi-volatile constituents of agarwood, the infected fragrant heartwood of some Aquilaria species, mainly A. malaccensis, A. sinensis and A. crassna, is presented in this article.
Abstract: A compilation of the volatile and semi-volatile constituents of agarwood, the infected fragrant heartwood of some Aquilaria species, mainly A. malaccensis, A. sinensis and A. crassna, is presented. This high-priced wood has a long tradition in religious ceremonies as incense and its essential oil is well appreciated in fine perfumery. More than 150 compounds have been identified so far, mostly sesquiterpenoids, chromones and volatile aromatic compounds. The scarce knowledge of their organoleptic properties is summarized. Studies on the chemistry of agarwood smoke are discussed. Emphasis is given to structural and analytical aspects.

290 citations

Journal ArticleDOI
TL;DR: All important chemical constituents of the Celastraceae family isolated up to 1 March 1978 are surveyed and discussed from a chemical, pharmacological, biosynthetic and chemotaxonomic point of view.

213 citations