Cited by 87Essential Oils and Antimicrobial ActivityPlant biochemistry and biosynthesisPhytochemicals and Medicinal Plants

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A glance at the chemodiversity of Ocimum species: Trends, implications, and strategies for the quality and yield improvement of essential oil

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Gurav, Tanuja P., Dholakia, Bhushan B., Giri, Ashok P.·2022·Phytochemistry Reviews

Abstract

Ocimum species represent commercially important medicinal and aromatic plants. The essential oil biosynthesized by Ocimum species is enriched with specialized metabolites specifically, terpenoids and phenylpropanoids. Interestingly, various Ocimum species are known to exhibit diverse chemical profiles, and this chemical diversity has been at the center of many studies to identify commercially important chemotypes. Here, we present various chemotypes from the Ocimum species and emphasize trends, implications, and strategies for the quality and yield improvement of essential oil. Globally, many Ocimum species have been analyzed for their essential oil composition in over 50 countries. Asia represents the highest number of chemotypes, followed by Africa, South America, and Europe. Ocimum basilicum L. has been the most widespread and well-studied species, followed by O. gratissimum L., O. tenuiflorum L., O. canum Sims, O. americanum and O. kilimandscharicum Gürke. Moreover, various molecular reasons, benefits, adverse health effects and mechanisms behind this vast chemodiversity have been discussed. Different strategies of plant breeding, metabolic engineering, transgenic, and tissue-culture, along with anatomical modifications, are surveyed to enhance specific chemotypic profiles and essential oil yield in numerous Ocimum species. Consequently, chemical characterization of the essential oil obtained from Ocimum species has become indispensable for its proper utilization. The present chemodiversity knowledge from Ocimum species will help to exploit various applications in the industrial, agriculture, biopharmaceutical, and food sectors.Supplementary information The online version contains supplementary material available at 10.1007/s11101-021-09767-z.

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Crossref · 10.1007/s11101-021-09767-z

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  • Ocimum × africanum essential oil is characterized by estragole or methyl chavicol, linalool, and citral (neral and geranial) rich chemotypes.

    “Ocimum × africanum essential oil is characterized by estragole or methyl chavicol, linalool, citral (neral and geranial) rich chemotypes (Raina and Misra, 2017; Gurav et al., 2021; Janesha et al., 2018; Pisutthanan and Pisutthanan, 2009).”

    From Vibrational spectroscopic methods for the identification and distinction of essential oils in genus Ocimum L.: A chemometric approach (2022) · cites this paper as Gurav et al., 2021

    The ‘Chemotypes reported from various Ocimum species and their hybrids’ section reports citral-rich oil containing geranial and neral from O. citriodorum, and lists methyl chavicol/linalool and other relevant chemotypes for O. americanum. It mentions O. africanum but does not specify these chemotypes for it or identify it with either of those named taxa. Page numbers are unavailable in our copy. (LLM, conf=0.76)

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  • Classification based on volatile oil composition requires distillation and fractionation of oils, and chemotype classification based on only one major volatile oil is erroneous because one plant may contain two or more chemical compounds in nearly equal amounts.

    “Furthermore, classification based on volatile oil composition requires the distillation and fractionation of oils, and the chemotype classification based on only one major volatile oil is erroneous as one plant may contain two or more chemical compounds in nearly equal amounts [15,20,21].”

    From Comprehensive Metabolomic Fingerprinting Combined with Chemometrics Identifies Species- and Variety-Specific Variation of Medicinal Herbs: An Ocimum Study (2023) · cites this paper as [21]

    Split into 2 atoms — 1 confirmed, 1 partially supported, 0 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.

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  • A significant number of studies have been devoted to describing Ocimum essential oils, but relatively few studies have been devoted to Ocimum leaves because there is a lack of a comprehensive and rapid fingerprinting approach.

    “A significant number of studies have been devoted to describing Ocimum essential oils [21,29,30], but relatively few studies have been devoted to Ocimum leaves as there is a lack of a comprehensive and rapid fingerprinting approach [16,31,32].”
  • Citral, linalool, and methyl chavicol are the three major essential oil components of O. × africanum.

    “On the basis of previous studies, it has been found that citral, linalool and methyl chavicol are the three major essential oil components of Ocimum × africanum (Raina and Misra, 2017; Gurav et al., 2021; Janesha et al., 2018; Pisutthanan and Pisutthanan, 2009).”

    From Vibrational spectroscopic methods for the identification and distinction of essential oils in genus Ocimum L.: A chemometric approach (2022) · cites this paper as Gurav et al., 2021

    In “Chemotypes reported from various Ocimum species and their hybrids” (page unavailable), our copy names O. africanum among species whose chemotypes are listed in supplementary tables, but does not state which compounds predominate in its oil. Searches for O. africanum with citral, linalool, and methyl chavicol found those compounds discussed for other Ocimum species or hybrids, not the claimed three-component profile for O. × africanum. (LLM, conf=0.70)

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2 of the 219 references couldn’t be matched to a known paper.

Research works printed but not linked: 13

  1. Bown D (2001) The herb society of America new herbs and their uses. DK, New York
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  8. Mathew R, Sankar PD (2014) Comparison of major secondary metabolites quantified in elicited cell cultures, non-elicited cell cultures, callus cultures and field grown plants of Ocimum. Int J Pharm Pharm Sci 6:102–106
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  10. Morales MR, Simon JE (1996) New basil selections with compact inflorescences for the ornamental market. In: Janick J (ed) Progress in new crops. ASHS Press, Alexandria
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Metadata

Authors
Gurav, T. P., Dholakia, B. B., & Giri, A. P.
Affiliations
  • National Chemical Laboratory (IN)
  • Tripura University (IN)
Corresponding author
  • Dholakia, Bhushan B.
  • Giri, Ashok P.
Venue
Phytochemistry Reviews
Published
2021-08-02
Volume
21
Issue
3
Pages
879-913
ISSN
  • 1568-7767 (ISSN-L)
  • 1572-980X
OpenAlex
W3187253987
Cited by
87
References
219
Citations by year
2026: 17 · 2025: 20 · 2024: 16 · 2023: 23 · 2022: 9 · 2021: 2
FWCI
1.14
Type
journal article
Language
en
Open access
Locations
  • Phytochemistry Reviews (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
Council of Scientific and Industrial Research, India (BSC0124)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Food Science › Essential Oils and Antimicrobial Activity
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Plant biochemistry and biosynthesis
  • Health Sciences › Medicine › Complementary and alternative medicine › Phytochemicals and Medicinal Plants
Keywords
Ocimum, chemodiversity, chemotypes, essential oil composition, Ocimum basilicum, Ocimum gratissimum, Ocimum sanctum, terpenoids, phenylpropanoids, plant breeding, metabolic engineering, transgenic plants, tissue culture, medicinal and aromatic plants

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