Study on analysis of waste edible oil with deterioration and removal of acid value, carbonyl value, and free fatty acid by a food additive (calcium silicate)

Improvement in the Quality of Deteriorated Blended Oil by Calcium Silicate Treatment

“…Calcium silicate adsorbent (Ca: Si = 1:3, CAS30) was obtained from Tomita Pharmaceutical Co., Ltd., Japan. The characteristics of CAS30 were previously reported in detail by Ogata et al 15,16) Deterioration of the oils prepared was performed as follows. Each oil prepared (300 mL) was heated at 180 °C with stirring at 250 rpm for 7 h per day for a total of 4 d. The oxygen flow for aeration was maintained at 300 mL/min.…”

“…[12][13][14] Moreover, we have elucidated that calcium silicate is an useful adsorbent for improving the quality of deteriorated pure oil. 15,16) Previous study reported the removal of AV or CV using calcium silicate at different molar rations. 16) Pore volume of calcium silicate (CAS30, the molar ratio of Ca:Si=1:3) was greater than that of calcium silicate at different molar rations.…”

Regeneration of Waste Edible Oil by the Use of Virgin and Calcined Magnesium Hydroxide as Adsorbents

“…Edible shirashime soybean oil, rapeseed oil, and olive oil were purchased from Showa Sangyo Co. Ltd. and J-OIL MILLS, Inc. Deterioration of the oils was carried out by both heat and aeration treatments 10 . Untreated edible oil 200 mL was heated at 180 while stirring at 250 rpm for 7 h/day total of 4 days while maintaining an aeration oxygen flow of 300 mL/min.…”

“…Polar compounds generated during the deterioration of edible oil were removed by the adsorbents because of van der Waals interactions 20 . In addition, calcium silicate, a food additive, is also useful for decreasing the AV, CV, and FFA 10 . The mechanism of adsorption of polar and non-polar compounds generated in waste edible oil by calcium silicate was related with the presence of silica gel molecules in calcium silicate.…”

Effect of Tocopherol Treatment on Deterioration of Edible Oil Quality (Acid Value, Carbonyl Value, Free Fatty Acid and Radical Activity)

“…Waste edible oil was prepared by both heat and aeration treatment 6,7 . Untreated edible oil 300 mL was heated at 180 while stirring at 250 rpm for 5 h per day Total days: 6 days and aerated oxygen flow at 300 mL/min.…”