natural-products-in-plant-pest-management

Antimicrobials to Prevent Biodeterioration of Grains 105The evaluation of the bioactive compound to understand the impact on thenutritional quality of the paddy grains stored up to 90 days revealed that1 g/kg treatment is effective in preventing biodeterioration of paddy grainswithout affecting the nutritional quality in terms of dry matter loss, lipid, carbohydrateand protein content (Fig. 4.8a–d), suggesting that 2-hydroxy-4-methoxybenzaldehydeis an important antimicrobial of plant origin that could be exploitedto prevent biodeterioration of grains during storage (Mohana et al., 2009).Even though a few antimicrobial active components have been isolatedand characterized by earlier workers, evaluations of these to assess their potencyto prevent biodeterioration of grains are lacking. The active compounds isolatedfrom the seeds of P. corylifolia L. and from the rhizome of D. hamiltoniiWight & Arn. have been successively evaluated to assess their potency to(a)Carbohydrate content (g/g)0.700.680.660.640.620.600.580.560.540.52Changes in total carbohydrates0 30 60 90Storage period (days)(b)Protein content (mg/g)4.34.24.14.03.93.83.70Changes in proteins30 60 90Storage period (days)Control0.5 gm/kgControl0.5 gm/kg1 gm/kgThiram1.0 gm/kgThiram(c)Lipid contents (mg/g)4035302520151050Changes in lipids0 30 60 90Storage period (days)(d)Dry matter loss (%)65432100Dry matter loss30 60 90Storage period (days)Control0.5 g/kgControl0.5 g/kg1 g/kgThiram1 g/kgThiramFig. 4.8. (a–d) Comparative effi cacy of the bioactive compound 2-hydroxy-4-methoxybenzaldehydeisolated from D. hamiltonii (0.5 g/kg and 1 g/kg) and thiram (2 g/kg) on fungiinducing nutritional losses in paddy grains stored up to 90 days.