Abstract
The essential oil of Kaempferia galanga L. commonly known as sand ginger has increased its demand in national and international market for decades. Cinnamic acid esters like ethyl-p-methoxy cinnamate (EPMC) and ethyl cinnamate (EC) are major constituents in its essential oil. In spite of the high demand for the plant as raw material, identification of quality chemovars having high essential oil (EO) yield and constituents is still at an infant stage. With this in mind, we have evaluated the EO yield of 36 accessions from three provinces of Eastern India, which varied within a range of 0.41 ± 0.01 to 2.63 ± 0.03 v/w. Further, a total of 65 compounds were detected by gas chromatography and mass spectrometry (GC-MS) with area percentages varying from 76.16 to 97.3%. EPMC was found to be the major component in 14 accessions with area percentages varying from 10.7% to 41.1%, whereas other 22 accessions showed EC as the major constituent, varying from 16% to 29.1%. Further, a diversity study among accessions was performed by agglomerative hierarchical clustering (AHC) and principal component analysis (PCA) analysis based on the abundance of identified constituents, which categorized all 36 accessions into three clusters. Thus, the present study helps to identify quality chemovar K.g16 and K.g14 with respect to oil yield and constituents, respectively, which could be used to guide commercial cultivation and further improvement of the taxa.
Highlights
Plant secondary metabolites play a significant role in the development of important drugs and cosmetics as they possess distinct physiological actions
Herbarium samples of accession K.g1–20 were submitted to the Plant Taxonomy and Conservation Department, Regional Plant Resource Center (RPRC), Bhubaneswar and those of K.g21–36 were submitted to Centre for Biotechnology (CBT), Siksha ‘O’ Anusandhan Deemed to be University, Bhubaneswar
principal component analysis (PCA) and agglomerative hierarchical clustering (AHC) were used for the first time as pattern recognizing methods to study the chemical diversity analysis of K. galanga essential oil. This approach it has been successfully employed to analyze the correlation and variation in different crops [35,36,41]. It can be concluded from the current study that there are variations in the yield and chemical composition of different K. galanga accessions collected from Odisha, WestBengal, and Assam provinces of India
Summary
Plant secondary metabolites play a significant role in the development of important drugs and cosmetics as they possess distinct physiological actions. With time, their uses have proven safety, efficacy, cultural acceptability and lesser side effects [1]. The rhizomes and the root tubers are used for treating wounds, piles, coughs, fever, skin diseases, epilepsy, bronchitis, rheumatism, asthma, malaria, and splenic disorders. For these reasons, K. galanga rhizomes have been known as stimulant, expectorant, diuretic, carminative, antihypertensive, larvicidal, and repellent in traditional remedies [11,12]
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