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High temperature-induced alterations of volatile profiles in fragrant brown rice
wimonmuang kanphassorn,Cho Yoo-Hyun,이영상 한국작물학회 2023 Journal of crop science and biotechnology Vol.26 No.1
To understand high temperature-induced alterations in flavor-determining volatile property of fragrant rice, the brown rice of ‘Cheonjihyang-1-se’ was exposed to 45 °C for periods of up to 7 days and subsequent daily changes in the relative amounts of volatiles were determined by Head Space-Solid Phase Microextraction coupled with Gas Chromatography-Mass Spectrometry. Based upon their time-series patterns of quantitative changes after exposure, 66 identified volatiles were classified into the following six groups: 13 newly produced, 21 gradually increased, 5 initially increased and constantly maintained, 7 not significantly changed, 16 gradually decreased, and 4 rapidly disappeared volatiles. The amount of 2-acetyl-1-pyrroline (2AP), the most important fragrance-determining volatile in rice, rapidly decreased by 61% after 7 days exposure to 45 °C, compared with pre-exposure. Multivariate Partial Least-Squares Discriminant Analysis showed that fragrant rice exposed to high temperatures for a different day could be distinguished using their volatile profiles. These results suggest that there were significant qualitative and quantitative changes in the volatiles in brown rice exposed to unfavorably high temperatures, which may result in alterations to the flavoring and overall market quality of fragrant rice.
Kanphassorn Wimonmuang,Hyojeong Yoon,Sang-Yun Lee,Soyeon Lee,In-Seop Jeong,Yoo-Hyun Cho,Young Sang-Lee 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
To understand changes in phytonutrient property during storage, recently patented fragrant rice variety "Cheonhyejinseonhyang-byeo" in rough and brown rice forms were stored at 4, 10,15, and 25°C up to 9 months, and changes in amount of tocopherols (T), tocotrienols (T3), squalene (SQ), and phytosterols were determined. Fragrant rice stored in brown rice showed significantly lower content compared to rough rice after 6 month storage in most phytonutrients except for SQ, especially under 25°C conditions. Higher temperature accelerated degradation of phytonutrients, especially when stored in brown rice, in that αT, αT3, γT, and γT3 contents stored at 25°C for 9 months reduced by 42, 61, 26, 45%, respectively, relative to pre-storage conditions. No temperature-dependent changes were observed in phytosterol and SQ contents in both rice forms up to 9-month storage. Extended storage duration decreased αT, αT3, γT, γT3 and SQ contents in that αT contents in brown rice exhibited 14, 28, and 42% reduction compared to pre-storage after 3, 6, and 9-month storage, while phytosterols showed increasing tendency during storage.
Method Development for Determination of Octacosanol Contents in Triticale (x Triticosecale) Leaves
Hyojeong Yoon,Sang-Yun Lee,Kanphassorn Wimonmuang,Myoung Ryoul Park,Ja-Hwan Ku,Young-Sang Lee 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
Octacosanol is an aliphatic 28-carbon fatty alcohol with diverse biological effects. Aiming at development of an optimized extraction methods for quantitation of octacosanol, dried and powdered leaves of triticale (x Triticosecale) were extracted under different solvent, temperature, duration, and multiple extraction conditions and then derivatized prior to injection into a GC-MS followed by quantitation in selected ion monitoring (SIM, m/z=467.4) mode. Finalized optimal analysis methods were as follows: single-time extraction of 200 mg powdered leaf samples in 20 mL chloroform for 24 hours at room temperature followed by silylation with N-Methyl-N-trifluoroacetamide (MSTFA). Validation of developed methods showed acceptable accuracy (83–97%, recovery rate), linearity (R²=0.999, within 1 to 200 ppm), intra-date repeatability (4.3%, RSD, n=6), and inter-date reproducibility (3.6%, RSD, n=3). The limit of detection (LOD) and limit of quantitation (LOQ) were 0.15 ppm and 0.45 ppm, respectively. All these findings supported practicality of developed analysis methods to quantify octacosanol in leaves of triticale.
Sang-Yun Lee,Eui-Jun Min,Hyo-Jeong Yoon,Kanphassorn Wimonmuang,Hee-Kyoung Kang,Young-Sang Lee 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
The fruits of Prunus mume containing high organic acid is a well-being food traditionally used at home and widely industrialized in Korea. Seeds of Prunus mume, however, also contain toxic cyanide called ‘amygdalin’ which may cause headache, food poisoning and even death. To develop a rapid and efficient analysis method to quantify amygdalin content, Prunus mume seeds were extracted in MeOH under different temperature (25-70℃), duration (10-240 min), multiple extraction (1-2 times) and filtration conditions and resultant extraction efficiencies were compared. Optimized analysis conditions were as follows: 100 mg of dried and pulverized seed were extracted in 10 mL MeOH at 60℃ for 30 min, filtered through Na2SO4, concentrated by using a rotary evaporator, and hexane-water solvent partitioning, collected water layer volume was adjusted to 20 mL prior to injection into an HPLC. Validation of developed method exhibited acceptable linearity (R²=0.9999, 25-500 ppm), accuracy (87-112%, recovery), repeatability (3.8%, RSD), reproducibility (3.6% RSD) and limit of detection (LOD) and quantification (LOQ) were 0.28 ppm and 0.84 ppm, respectively.