Nutritional Compositions, Phenolic Contents and Antioxidant Activities of Rainfed Rice Grown in Different Degrees of Soil Salinity

Abstract

Rice (Oryza sativa) is a staple food crop for over half of the world’s population. However, drought as a result of climate change has led to increased soil salinity, thereby reducing agricultural potential, especially rice nutritional compositions and biochemical properties. Nevertheless, soil management by using suitable fertilizers might be able to improve rice quality even though these rice samples were grown in soil with a high degree of salinity. This study investigated nutritional compositions, phenolic contents, and antioxidant activities of twenty-five rainfed rice samples in Khao Dawk Mali 105 (KDML105) and Rice Department 15 (RD15) varieties grown in soil with different degrees of salinity. The soil, however, had been improved by the usage of fertilizer at the tillering and booting stages. Results indicated that all rice samples exhibited similar nutrients, total phenolic contents (TPCs), and antioxidant potentials, suggesting that appropriate fertilizer could improve rice qualities. Principle Component Analysis (PCA) and Pearson correlation results suggested that regardless of rice varieties, organic matter (OM) and soil potassium (Ks) showed a very strong positive correlation with protein and minerals (Ca, Na, K, and Fe), while opposite results were observed with soil pH. Moderate to very weak correlations were also observed between soil parameters and TPCs, as well as between soil parameters and antioxidant activities. The received information will be useful for the future development of appropriate fertilizer usage in salt-tolerant rice with particular nutritional quality.

Green Extraction of Hodgsonia heteroclita Oilseed Cake Powder to Obtain Optimal Antioxidants and Health Benefits

“…Phenolics can act as effective antioxidants. Our results were in line with previous studies, suggesting that TPCs were highly correlated to antioxidant activities, whereby OCPs with high TPCs led to high antioxidant activities [39]. An 80% (v/v) aqueous methanolic extract of flaxseed, sesame, mustard, nigella, and groundnut OCPs exhibited DPPH radical scavenging activities ranging from 5.80 to 12.28 µmol TE/g DW [35], while 96% (v/v) aqueous ethanolic extracts of camelina, linseed, and rapeseed OCPs exhibited DPPH radical scavenging activities with half maximal effective concentration (EC 50 ) values of 2.8 to 5.7 µg/mL [34].…”

Phenolic profiles and in vitro biochemical properties of Thai herb ingredients for chronic diseases prevention

“…High TPCs in CSA gave high antioxidant potential in both HAT and SET mechanisms. A strong correlation between TPCs and antioxidant activities was also observed in rice, sacred lotus, and other plant extracts 12 , 16 , 23 , while water extract of CSA stem bark exhibited TPC of 682.67 mg GAE/g extract and DPPH radical scavenging activities with IC 50 of 9.47 µg/mL as the highest among 16 galactogogue medicinal plants in Northeastern Thailand 24 . This TPC value corresponded to our 70% ( v/v ) aqueous ethanolic extract of CSA with TPC of 728.50 mg GAE/g extract.…”

Fructan Concentrations in Cooked Cereal Grains as a Nutritional Consideration for Low-FODMAP Diet

“…The investigation into varying fructan levels in white and brown rice emphasizes the imperative for ongoing exploration, particularly in light of potential gluten contamination and the bran component in brown rice. The divergent fructan profiles between these rice varieties highlight the relationship between grain composition and fructan content, insisting on the understanding in the context of dietary management [ 1 , 19 ]. In the context of barley and wheat groats, the significant presence of fructans, particularly in items like couscous and bulgur, was noticed.…”