The objective of this study was to investigate the physical characteristics, phytochemical contents, and antioxidant activity of 10 organic-pigmented rice varieties including Tubtim Chumpae, Niaw Daeng, Nieng Guang, Mali Daeng, Hom Nil, Niaw Dam, Riceberry, Mali Gomain Surin, Malinil Surin, and Pa Ga Am Puen (obtained from Tapthai organic villages, Tha-mo, Prasat, Surin province, Thailand in June, 2021). The physical characteristics investigated included grain length, width, shape, and color in both paddy and unpolished rice. The results revealed that the mean length and width of paddy rice grain varieties ranged from 6.58 to 10.85 mm and 2.12 to 3.27 mm, respectively, while the length and width of unpolished rice grain were 5.94 to 7.53 mm and 1.74 to 2.61 mm, respectively. Most organic-pigmented rice varieties had a slender shape except for Nieng Guang and Niaw Dam, which were moderately shaped. There were 5 colors of paddy rice, including straw, purple, purple straw, black and black furrow on straw background and light purple straw while unpolished rice showed red, dark purple, black, purple, and light brown color. The anthocyanin content, total phenolic compounds and antioxidant activity of different rice varieties showed a significant difference in the range of 4.38 to 77.96 mg/100 g DW, 42.94 to 341.19 mg GAE/100 g DW and 2.71 to 34.77 mM TE/100 g DW, respectively. Niaw Dam exhibited the highest anthocyanin concentrations. The highest total phenolic content was found in Mali Daeng and Nieng Guang, resulting in high antioxidant activity. This study suggested that pigmented rice is rich in phytochemicals and antioxidants. Nieng Guang, in particular, could be promoted for cultivation and beneficial use in the food, pharmaceutical, and cosmetic industries. HIGHLIGHTS Surin province is one of the principal regions with diverse indigenous and commercial rice varieties in Thailand The grain shape of eight varieties of rice, including Tubtim Chumpae, Niaw Daeng, Mali Daeng, Hom Nil, Riceberry, Mali Gomain Surin, Malinil Surin and Pa Ga Am Puen were slender while that of Nieng Guang and Niaw Dam varieties were moderate. The physical aspects of rice indicate its quality, market value and have essential role in selecting, handling, storing, and processing of rice Niaw Dam black rice had a high content of anthocyanin while Mali Daeng and Nieng Guang red rice had the highest content of total phenols, resulting in higher antioxidant activity than the other Pa Ga Am Puen brown rice had the lowest anthocyanin content, total phenolic content and antioxidant activity The basic information of this study might be useful for selecting rice varieties for future rice breeding and provide pigmented rice nutrition information especially indigenous pigmented rice which has potential in the food, pharmaceutical and cosmetic industries GRAPHICAL ABSTRACT
Mulberry fruit has a short shelf life of only 1 - 2 days under room conditions, make it one of the most fragile and extremely perishable fruits. This study investigated the effects of exogenous methyl jasmonate (MeJA) combined with polyethylene bag (PE) on postharvest decay, total ascorbic acid, total phenolic, anthocyanin, and antioxidant activities in 'Kamphaeng Saen 42’ mulberry fruits. The study was conducted at Postharvest Quality and Storage System Laboratory, Division of AgriScience and Technology (Postharvest Technology), Faculty of Bioresources and Technology, King Mongkut’s University of Technology Thonburi in December 2019. The experiment was laid out in Completely Randomized Design (CRD) with 4 replicates and 2 treatments consisting of 1) untreated with MeJA (control) and 2) fruits treated with 10 mmol L-1 methyl jasmonate (MeJA) combination with polyethylene bag (PE) and maintained at 10 ± 2 °C, 90 ± 2 % relative humidity (RH). The results showed that treating the mulberry fruits with 10 mmol L-1 MeJA before placing them in the PE bag was the most effective method to reduce fruit decay and also resulted in higher levels of total ascorbic acid, total phenols, and antioxidant activities than in the control at the end of storage (55.14 mg/100 g FW, 43.78 mg GAE /g FW and 28.91 mM TE /100 g FW), respectively. However, the treated fruits showed lower anthocyanin content than the control during the first 8 days of storage. These results suggest that the combination of MeJA with PE bag is beneficial in reducing fruit decay and increasing total ascorbic acid, total phenols, and antioxidant activities in 'Kamphaeng Saen 42’ mulberry fruits during storage at 10 ± 2 °C, 90 ± 2 % RH for 10 days. HIGHLIGHTS Mulberry fruit is one of the most fragile and extremely perishable fruits resulting in its has short shelf life Exogenous MeJA combined with PE bag were applied to decay reduction and enhanced total ascorbic acid, total phenolic, and antioxidant activities in ‘Kamphaeng Saen 42’ mulberry fruit Mulberry fruits treated with 10 µmolL-1 MeJA combined with PE bag were the most effective in reducing fruit decay and increasing total ascorbic acid, total phenols, and antioxidant activities in 'Kamphaeng Saen 42’ mulberry fruits GRAPHICAL ABSTRACT
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