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Evaluating eggplant (Solanum melongena L) genotypes for bioactive properties: A chemometric approach

Kaur, Charanjit, Nagal, Shweta, Nishad, Jyoti, Kumar, Ravinder, Sarika,
Food research international 2014 v.60 pp. 205-211
Solanum aculeatissimum, Solanum aethiopicum, Solanum incanum, Solanum melongena, Solanum sisymbriifolium, Solanum torvum, antioxidant activity, chemometrics, cluster analysis, eggplants, flavonoids, free radical scavengers, gallic acid, genotype, principal component analysis, solanum integrifolium, wild relatives
Thirty four genotypes of eggplant and its wild relatives were evaluated for their total phenolics, flavonoid content and antioxidant capacity. Free radical scavenging was evaluated using four in-vitro assays, viz. FRAP (Ferric reducing antioxidant power), CUPRAC (cupric reducing antioxidant capacity), TEAC (Trolox equivalent antioxidant capacity) and DPPH (2, 2-diphenylpicrylhydrazyl). Total phenolics in eggplant showed a wide variation, ranging from 22.62 to 234.46mg gallic acid equivalents (GAE)/100g fw (244.28 to 2990.64mgGAE/100g dw). With the exception of Solanum aethiopicum and its accessions (Ac-1, Ac-2 and Ac-3), all wild relatives had significantly (p<0.05) higher total phenolics and flavonoid content than cultivated ones. Total antioxidant capacity (FRAP) in wild genotypes ranged from 1.13 to 8.04μmol Trolox (TE)/g. The hierarchy in decreasing order was Solanum khasianum>Solanum torvum>Solanum sisymbriifolium>Solanum incanum>Solanum integrifolium>S. aethiopicum. The antioxidant capacity correlated high with total phenolics in all assays. In cultivated group, JBR-99 and RCMBL-3 possessed high antioxidant capacity than the rest. Principal component analysis (PCA) and Hierarchical cluster analysis (HCA) revealed distinct similarity between JBR-99 (green), S. sisymbriifolium, S. khasianum and S. torvum. Overall results indicate that the wild species of S. torvum, S. incanum and S. sisymbriifolium are potential candidates for improving the functional quality of cultivated eggplant.