Publications by authors named "Halida Rahmania"

Article Synopsis
  • The roasting process of sesame oil changes its internal composition, which affects its stability against oxidation, but this effect varies depending on the type of oxidation (thermal or photo).
  • The study compared different sesame oils (raw, refined, and roasted) and rapeseed oils by exposing them to thermal oxidation at 120℃ and photo-oxidation at 50,000 lx for 5 and 10 hours.
  • The findings indicate that roasted sesame oil is more stable during thermal oxidation due to antioxidant changes, while refined sesame oil is more stable under photo-oxidation, highlighting the significant impact of both roasting and refining processes on sesame oil’s oxidative stability.
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Food lipid oxidation provides various volatile compounds involved in food flavor via the decomposition of lipid hydroperoxide (LOOH). This study predicted the pathways which can coherently explain LOOH decomposition focusing on hydroperoxy octadecadienoic acid (HpODE) isomers (9-EZ-HpODE, 9-EE-HpODE, 10-HpODE, 12-HpODE, 13-ZE-HpODE, and 13-EE-HpODE) which are the major LOOH contained in edible oils. Each standard was first prepared and thermally decomposed.

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Article Synopsis
  • Acid value (AV) measures oil degradation by looking at free fatty acids from the breakdown of triacylglycerols, but this study hypothesizes that carboxylic acids from triacylglycerol oxidation also contribute to AV.
  • Heating canola oil at 180 °C for 6 hours raised the AV significantly, but the increase from free fatty acids was minimal, suggesting other factors are at play.
  • The research identified specific azelaoyl-triacylglycerols contributing to AV increase, indicating that AV is also a marker for the thermal oxidation of oils.
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Even though γ-oryzanol (OZ) such as 24-methylenecycloartanyl ferulate (24MCAFA) is abundant in purified rice bran oil, we realized that the oil contained the prospect of two additional novels of OZ species. To identify this, we isolated and analyzed their chemical structures by using HPLC-UV-MS, NMR, and IR. We revealed for the first time that the oil had also contained cyclobranyl ferulate (CBFA) and cyclosadyl ferulate (CSFA) which are likely to be exist due to the isomerism of 24MCAFA under acid condition.

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Although the stability of rice bran oil (RBO) has been showed on several studies, the factors which make it capable on maintaining its stability under thermal oxidation has not been sure yet. We hypothesized that its fatty acid composition [high composition of oleic acid (OA), lower composition of linoleic acid (LA) and α-linolenic acid (LnA)] and/or its antioxidant agents [γ-oryzanol (OZ)] and vitamin E [tocopherol (Toc), tocotrienol (T3)] might be the biggest factor. To prove the hypothesis, we thermally oxidized RBO under 40 °C for 17 days to mimic the harsh daily storage condition, and compared it with soybean oil (SO) and rapeseed oil (RPO) then monitoring their primary oxidation products [triacylglycerol hydroperoxide (TGOOH)] from easily oxidized fatty acid contained in triacylglycerol (TG) and the amount loss of antioxidant agents.

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γ-Oryzanol (OZ), a functional substance found in rice bran, consists of multiple molecular species. In both in vitro and in vivo studies, the researches exploring the various function of rice bran OZ have been conducted for a long time, and it has become clear that OZ has a lot of pharmaceutical activities. It is assumed that each type of OZ molecular species may have different effects.

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γ-Oryzanol (OZ), which has a lot of beneficial effects, is a mixture of ferulic acid esters of triterpene alcohols (i.e., triterpene alcohol type of OZ (TTA-OZ)) and ferulic acid esters of plant sterols (i.

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For Indonesian community, meatball is one of the favorite meat food products. In order to gain economical benefits, the substitution of beef meat with rat meat can happen due to the different prices between rat meat and beef. In this present research, the feasibility of FTIR spectroscopy in combination with multivariate calibration of partial least square (PLS) was used for the quantitative analysis of rat meat in the binary mixture of beef in meatball formulation.

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