Spectroscopic measurement and dielectric relaxation study of vegetable oils  

作　　者：S.M.Sabnis D.N.Rander K.S.Kanse Y.S.Joshi A.C.Kumbharkhane 

机构地区：[1]Deptt.of Physics and Electronics,Lal Bahadur Shastri Mahavidyalaya,Dharmabad,Dist.Nanded(MS),India [2]School of Physical Sciences,Swami Ramanand Teerth Marathwada University,Nanded(MS),India

出　　处：《Information Processing in Agriculture》2024年第3期397-408,共12页农业信息处理(英文)

基　　金：The financial supports from SERB,DST,New Delhi(Project no.SR/FTP/PS-203/2012 and Project no.SB/S2/LOP-032/2013)are gratefully acknowledged.

摘　　要：The purpose of the current study is to investigate the qualitative characterization of nine different pure vegetable oil samples using dielectric spectroscopy which is a vastly resourceful and reasoned technique in the temperature range 0℃ to 25℃.Time-domain reflectometry technique is applied up to the microwave frequencies of 50 GHz for the first time for qualitative characterization of the selected vegetable oil samples with a special focus on the variances of dielectric properties like dielectric permittivity(ε′),dielectric loss(ε″),relaxation time concerning temperature and other physiochemical properties of the vegetable oil specimens.The experimental methodology involves the use of time-domain reflectometry(TDR)measurements up to the scale of 50 GHz done to analyse the aspects like lower and higher scales of values towards the static dielectric permittivity(ε_(s))and relaxation time(τ)(ps)to further meaningfully compare and correlate this values with the fatty acid profiles of each of the nine vegetable oil samples to reason and draw comparative inferences about the quality aspects of vegetable oils.Microwave TDR studies provide an effective,alternate,simple,rapid,and viable way to exercise quality control and actuate data regarding the quality status of vegetable oils.Variances of dielectric permittivity(ε′)concerning dielectric loss(ε″)are graphically interpreted using the Cole Davidson model.The static dielectric permittivity(ε_(s))was further recertified and measured accurately by using a precision LCR meter.Thermodynamic properties of all the nine vegetable oil samples like enthalpy(ΔH)(kJ/mol)and entropy of activation(ΔS)(J/mol·K)are also calculated to further insight the dependence of dielectric properties of these oil samples concerning temperature.This dielectric spectroscopic study affirms the association of the quality aspects of these nine vegetable oil samples with their dielectric properties by providing meaningful correlations,comparatives and concurrencies of dielectric

关 键 词：Vegetable oils Time-domain reflectometry(TDR) Dielectric permittivity(e) Relaxation time(t) Fatty acid profile 

分 类 号：TS225[轻工技术与工程—粮食、油脂及植物蛋白工程] O63[轻工技术与工程—食品科学与工程]