Summary Studies were undertaken to examine the effect of heat treatment on total phenolic content (TPC), colour value (yellowishness and brightness), polyphenol oxidase (PPO) activity and curcuminoid of fresh turmeric rhizome. Fresh turmeric rhizomes were subjected to heat treatment at different temperatures (60–100 °C) for different durations (10–60 min), causing a reduction in browning which was evident from the improved yellowishness and brightness. Activity of PPO was also decreased during heat treatment and PPO was almost inactivated when heated at 80 °C for 30 min. TPC of heat‐treated turmeric after drying (powder) is significantly higher than that after the fresh process. TPC values increased gradually when samples were heated from 60 to 80 °C. At 90 and 100 °C, TPC values were almost identical. Maximum brightness and yellowishness were obtained when the turmeric was heated above 80 °C. Quantitation of curcuminoids in the turmeric sample was made with high performance thin layer chromatography (HPTLC). There was no significant change in the concentration of curcuminoids among the heat‐treated samples. But in the sun‐dried samples, a significant reduction in curcuminoid concentration was observed.

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The persistence of the y isomer of benzene hexachloride (lindane), when added to submerged tropical soils at a rate approximately three times that recommended for the protection of rice from stem borer infestation and of the a, ß, and isomers of benzene hexachloride applied at similar rates was between 70 and 90 days. Losses of all four isomers from sterilized, flooded soil samples were much slower than from nonsterilized samples, indicating that the microflora of submerged soils is able to degrade benzene hexachloride. Microbial degradation of -BHC was demonstrated by the release of C140> from submerged soils treated with C14-labeled -BHC. An application of -BHC at a rate approximately five times the usual field rate apparently inhibited CCL evolution from two tropical soils.

The antidiabetic effect of ginger was experimentally proved in the study and has concluded that the activity is initiated by antioxidant, antiglycation and potential to express or transport Glut4 receptors from internal vesicles.