Photochemical advanced oxidative process treatment effect on the pesticide residues reduction and quality changes in dried red peppers

Abstract

Pesticide residues in crops are widely monitored, and the residue reduction techniques at the post-harvest stage are important to maintain food safety. In dried crops, pesticide residues can be concentrated after dehydration, which increases concerns regarding residue risk. Therefore, the residue reduction effects of ultraviolet (UV), ozone, and photochemical advanced oxidative process (pAOP) were investigated for dried peppers at the post-harvest stage. UV254 treatment reduced 59.7% of the residue concentration on average, while UV360 showed a reduction of only 13.3% under 9.6 W m−2 of UV exposure for 24 h. Gaseous ozone treatments reduced the residue concentrations up to 57.9% on average. In contrast, the pAOP treatment reduced the concentration up to 97% and was superior to UV or ozone treatment alone. Increased drying temperature under pAOP condition resulted in higher reduction ratios at 40–80 °C. The pAOP conditions with 12 and 24 µmol/mol of ozone and UV254 irradiation for 24–48 h reduced the residue concentrations to 39–67%. Particularly, difenoconazole, fludioxonil, imidacloprid, and thiamethoxam residue concentrations were drastically reduced by over 50% under 12 µmol/mol ozone of the pAOP condition, while carbendazim, fluquinconazole, and pyrimethanil were relatively stable and their concentrations reduced below 50% under 24 µmol/mol ozone of the pAOP treatment. Various drying-related quality parameters of drying peppers such as water-soluble color, capsanthin, capsaicinoids, acid value, peroxide value, and thiobarbituric acid value were slightly altered, but not significantly, under 12 µmol/mol ozone of the pAOP condition, while the peroxide value was significantly altered under the higher ozone conditions. Therefore, pAOP treatment combined with gaseous ozone can be used for reducing residual pesticides in peppers without greatly reducing quality.

Effect of Abiotic Signals on the Accumulation of Saponarin in Barley Leaves in Hydroponics Under Artificial Lights

“…The light quantity was controlled at 100, 300, and 500 PPFD, and the quantity was measured with a Portable Luxmeter (HD2102.1, Delta OHM S.r.l., Selvazzano Dentro, Italy). The blue light LED (Zhongshan Jinsung Electronic, Zhongshan, China) and UVA lamp (Hansung Ultraviolet Co. Ltd. Seongnam, Republic of Korea) were used as additional light sources . The additional blue light and UVA were irradiated to 10% of the total PPFD and 2.5 W m –2 , respectively.…”

“…The blue light LED (Zhongshan Jinsung Electronic, Zhongshan, China) and UVA lamp (Hansung Ultraviolet Co. Ltd. Seongnam, Republic of Korea) were used as additional light sources. 40 The additional blue light and UVA were irradiated to 10% of the total PPFD and 2.5 W m –2 , respectively.…”

Purification of Pesticide-Contaminated Water Using Activated Carbon from Prickly Pear Seeds for Environmentally Friendly Reuse in a Circular Economy

“…Its residues are often found in fruit, vegetables, cereals, and dairy products, as well as in drinking water [16][17][18][19]. Currently, there are several methods for treating pesticide-contaminated water, including ozonation [20,21], reverse osmosis [21], photocatalytic degradation [22] using various nanomaterials [23], the advanced oxidative process [24,25], photo-Fenton processes [26,27], anaerobic-aerobic biological treatment [28], etc. AC adsorption is a highly successful technique used for the removal of pesticides from contaminated water [29].…”