共查询到20条相似文献,搜索用时 15 毫秒
1.
L. Velasco J. M. Fernández-Martínez A. De Haro 《Journal of the American Oil Chemists' Society》1997,74(12):1595-1602
Near-infrared reflectance spectroscopy (NIRS) was used to estimate the fatty acid composition of the oil in intact-seed samples
of Ethiopian mustard (Brassica carinata Braun) within a mutation breeding program that produced seeds with variable fatty acid compositions. Five populations, from
1992 to 1996 crops, were included in this study; and NIRS calibration equations for major fatty acids (palmitic, stearic,
oleic, linoleic, linolenic, eicosenoic, and erucic) were developed within each single population. Furthermore, global calibration
equations, including samples from the five populations, were developed. After external validation, the NIRS technique permitted
us to obtain a reliable and accurate nondestructive estimation of the fatty acid composition of the oil, especially for the
major acids—oleic, linoleic, linolenic, and erucic. For these, the r
2 in external validation was higher than 0.95 by using both single-and multipopulation equations, and higher than 0.85 for
the remaining fatty acids. Moreover, the multipopulation equations provided an accurate estimation of samples from a population
not represented in the calibration data set, with values of coefficient of determination in validation (r
2) from 0.80 (palmitic and eicosenoic acids) to 0.97 (erucic acid). The ability of NIRS to discriminate among different fatty
acid profiles was mainly due to changes within six spectral regions, 1140–1240, 1350–1400, 1650–1800, 1880–1920, 2140–2200,
and 2240–2380 nm, all of them associated with fatty acid absorbers. Thus, NIRS can be used to estimate the fatty acid composition
of Ethiopian mustard seeds with a high degree of accuracy, provided that calibration equations be developed from calibration
sets that include large variability for the fatty acid composition of the oil. 相似文献
2.
Qingkang Wang Huixian Xing Xiangliu Liu Lili Mao Ze Wei Haijun Zhang Liyuan Wang Haoran Wang Muhammad Saeed Guihua Zhang Xianliang Song Xue-Zhen Sun Yanchao Yuan 《Journal of the American Oil Chemists' Society》2020,97(4):331-340
Rapid and accurate analysis of cottonseed protein content and the composition of fatty acids (especially, saturated fatty acids) is often required in cotton production and breeding programs. This study aimed to establish a set of effective estimation models for these parameters. Near infrared reflectance spectroscopy (NIRS) calibration equations using partial least-squares regression for protein concentration, oil concentration, and five fatty acids of shell-intact cottonseeds were established based on 90 varieties, and the prediction abilities of the calibration models were verified using 45 other varieties. The prediction abilities of the NIRS calibration equations were basically consistent with external validation results. Each equation was assessed based on the ratio of performance to deviation (RPDp). Protein content and seed total fatty acid (STA) content had high RPDp values (3.687 and 3.530, respectively), whereas cottonseed kernel total fatty acid (KTA) content, linoleic acid (18:2), stearic acid (18:0), myristic acid (14:0), and palmitic acid (16:0) exhibited relatively high RPDp (2.866, 2.836, 2.697, 2.676, and 2.506, respectively). The calibration model for oleic acid (18:1) had a low RPDp (1.945). The results indicated that NIRS can be used to rapidly determine contents of STA, KTA, protein, stearic acid (18:0), myristic acid (14:0), and palmitic acid (16:0) in shell-intact cottonseed. 相似文献
3.
Charles R. Hurburgh 《Lipid Technology》2007,19(4):88-90
Improvement of nutritional and/or functional properties of soybean oil by modification of soy fatty acid composition is one of the objectives of plant breeders. A major element of breeding is rapid identification and tracking of traits in seed samples. This discussion summarizes the progression of whole‐soybean fatty acid calibration developments at Iowa State University. Emphasis was placed on linolenic acid (18:3) and total saturates (16:0 + 18:0). Normal soybeans have 12–20% (of the oil) saturated fats; modified low saturate soybeans have 6–8% saturated fats. Normal soybeans have 6–12% linolenic acid; modified low linolenic soybeans have 1–3% linolenic acid. Infratec 122x/1241 and Bruins OmegaG NIRS units were calibrated to measure fatty acid levels as a percentage of total oil content, in whole soybeans. The first Infratec calibrations (in 1998) did not remain accurate as soybean genetics changed. Iterations of the calibration process yielded calibrations for total saturates and linolenic acid with standard errors of prediction (on 2005 crop samples not included in the calibration pool) of 1.0% percentage points and 0.8% points, respectively. These were sufficient to classify modified versus normal concentrations of the two fatty acids. The NIRS units could not determine the specific percentages within the classes of modified and normal soybeans. 相似文献
4.
Selections for different levels of C18 fatty acids in rapeseed to date have had only limited success, due in part to the low frequency of occurrence of desired
genotypes with increased linoleic and decreased linolenic acid. In the progeny of mutation experiments with seeds of the variety
Oro (linolenic acid content 8–10%) two stable mutants were selected, one with 5% and the other with 20% linolenic acid in
the seed oil. The level of linoleic acid in the two mutants is the same as Oro (16–20%), but the levels of oleic and linolenic
acids are inversely altered. In this paper several problems associated with selecting for linoleic and linolenic acids, which
became apparent during the mutation studies, are discussed. Many selections made from the mutated material were unstable,
reverting to the original Oro fatty acid composition after two or three self-pollinated generations. This fact plus environmental
and maternal effects made selection difficult. However, with the use of rapid and simple analytical methods and space-saving
growing techniques, these difficulties were overcome.
One of six papers presented in the symposium “Rapeseed Marketing and Breeding,” AOCS Meeting, Ottawa, September 1972. 相似文献
5.
Álvaro Fernández‐Cuesta José M. Fernández‐Martínez Rafel Socias i Company Leonardo Velasco 《European Journal of Lipid Science and Technology》2013,115(2):211-216
Almond kernels show large variability for oil content and fatty acid profile. The objective of this research was to evaluate the potential of near infrared (NIR) reflectance spectroscopy (NIRS) for the analysis of these traits in almond flour. Ground kernels of 181 accessions collected in 2009 were used for developing calibration equations for oil content and concentrations of individual fatty acids. Calibration equations were developed using second derivative transformation and modified partial least squares regression. They were validated with samples from 179 accessions collected in 2010. The accuracy of calibration equations was measured through the coefficient of determination (r2) in external validation and the ratio of the SD in the validation set to the standard error of prediction (RPD). Both r2 and RPD were high for oil content (r2 = 0.99; RPD = 9.24) and concentrations of oleic (r2 = 0.97; RPD = 5.37) and linoleic acids (r2 = 0.98; RPD = 7.35), revealing that calibration equations for these traits are highly accurate. Conversely, the accuracy of the calibration equations for palmitic (r2 = 0.54; RPD = 1.41) and stearic acids (r2 = 0.52; RPD = 1.44) was too low for allowing their application in practice. NIRS discrimination of oil content and concentrations of oleic and linoleic acids was mainly based on the spectral region from 2240 to 2380 nm. Practical applications : NIRS is a high‐throughput analytical technique that allows fast measurement of several traits in a single analysis without using chemical reagents. We evaluated the feasibility of analyzing oil content and concentrations of palmitic, stearic, oleic, and linoleic acids in almond flour using fruits collected during 2 years from a world germplasm collection. The fruits collected in 2009 were used for NIRS calibration, whereas the fruits collected in 2010 were used for validation. NIRS equations were highly accurate for measuring oil content and concentrations of oleic and linoleic acids, which are important traits defining the quality of almond flour for specific uses in the food industry. These results have applications both in the research laboratory and the food industry, where NIRS is becoming a widely used technique for quality control. 相似文献
6.
Rudolphi S Becker HC Schierholt A von Witzke-Ehbrecht S 《Journal of the American Oil Chemists' Society》2012,89(3):363-369
Near-infrared reflectance spectroscopy (NIRS) of intact seeds allows the non-destructive estimation of seed quality parameters
which is highly desirable in plant breeding. Together with yield, oil content and quality, a main aim in safflower (Carthamus tinctorius L.) breeding is the selection of genotypes with a low percentage of empty seeds even under cooler climates. We developed
NIRS calibrations for seed oil content, oleic and linoleic acid content, the seed hull fraction and the percentage of empty
seeds using seed meal and intact seeds. For the different calibrations 108–534 samples from a safflower breeding program with
lines adapted to German conditions, were analyzed with reference analyses (Soxhlet, gas chromatography), and scanned by NIRS
as intact seeds and seed meal. Calibration equations were developed and tested through cross validation. The coefficient of
determination of the calibration (R
2) for intact seeds ranged from 0.91(oil content), 0.90 (seed hull fraction), 0.84 (empty seeds), 0.73 (linoleic acid) to 0.68
(oleic acid). The coefficient of determination of the cross validation was higher for seed meal than for intact seeds except
for the parameter seed hull fraction. The results show that NIRS calibrations are applicable in safflower breeding programs
for a fast screening. 相似文献
7.
8.
Jiří Čmolík Jan Pokorný Marek Doležal Zdeněk Svoboda 《European Journal of Lipid Science and Technology》2007,109(7):656-662
The effect of the operating temperature (between 220 and 270 °C) on the formation of trans isomers of linoleic and linolenic acids in physically refined rapeseed oil during deodorization in a plant‐scale semicontinuous tray‐type deodorizer (capacity 10 t/h) was investigated. The industrial procedures of physical refining consisted of a two‐step bleaching and deodorization process. The degree of isomerization of linoleic acid ranged from 0.33 to 4.77% and that of linolenic acid from 4.43 to 45.22% between 220 and 270 °C, respectively. A relation between the logarithm of the degree of isomerization and the deodorization temperature can be approximated by statistically highly significant linear functions for both linoleic and linolenic acids. Oleic acid was resistant to the heat‐induced geometrical isomerization. The values found for the ratio between the degrees of isomerization of linolenic and linoleic acids, slightly decreasing with increasing temperature, were equal to 13.6 and 12.9 at 230 and 240 °C, respectively. Two trans isomers of linoleic acid, exclusively with one double bond isomerized into trans configuration, and four trans isomers of linolenic acid, mostly with one double bond isomerized into trans configuration, were determined in deodorized rapeseed oils. Linolenic acid was observed to be the main source responsible for the formation of nearly all trans fatty acids in physically refined rapeseed oil. At 235 °C, a deodorization temperature considered as a reasonable technological compromise, the content of trans fatty acids in plant‐scale physically refined rapeseed oil was less than 1% of total fatty acids, which would be acceptable for further application. 相似文献
9.
Comparative studies on composition of cardiac phospholipids in rats fed different vegetable oils 总被引:5,自引:5,他引:0
J. K. G. Kramer 《Lipids》1980,15(9):651-660
Male Sprague-Dawley rats were fed diets for 1 or 16 weeks, containing 20% by weight vegetable oils differing widely in their
oleic, linoleic and linolenic acid content. No significant changes were observed in the level of the cardiac lipid classes.
The fatty acid composition of the 2 major phospholipids, phosphatidylcholine and phosphatidylethanolamine, showed a remarkable
similarity between diets in the concentration of total saturated, C22 polyunsaturated and arachidonic acids. Monounsaturated
acids were incorporated depending on their dietary concentration, but the increases were moderate. Dietary linolenic acid
rapidly substituted C22 polyunsaturated fatty acids of the linoleic acid family (n−6) with those from the linolenic acid family
(n−3). The results suggest that dietary linolenic acid of less than 15% does not inhibit the conversion of linoleic to arachidonic
acid but the subsequent conversion of arachidonic acid to the C22 polyunsaturates was greatly reduced. Significant amounts
of dietary monounsaturated fatty acids were incorporated into cardiac cardiolipin accompanied by increases in polyunsaturated
fatty acids, apparently to maintain an average of 2 double bonds/molecule. The cardiac sphingomyelins also accumulated monounsaturated
fatty acids depending on the dietary concentration. It is quite evident from the results of this study that the incorporation
of oleic acid and the substitution of linolenic for linoleic acid-derived C22 polyunsaturated fatty acids into cardiac phospholipids
was related to the dietary concentration of these fatty acids and was not peculiar to any specific oil. Even though it is
impossible to estimate the effect of such changes in cardiac phospholipids on membrane structure and function, results are
discussed which suggest that the resultant membrane in the Sprague-Dawley male rat is more fragile, leading to greater cellular
breakdown and focal necrosis.
Contribution No. 914 from the Animal Research Institute. 相似文献
10.
建立了分析越南安息香种子油、果实和果壳的脂肪酸组成的在线甲基化-气相色谱法。将微克级的安息香样品与2μL衍生化试剂三甲基氢氧化硫(0.2 mol/L)加入裂解器,在350℃下瞬间反应,由气相色谱在线检测到8种脂肪酸甲酯成分,主要有棕榈酸( C16∶0)、硬脂酸( C18∶0)、油酸( C18∶1)、亚油酸( C18∶2)和亚麻酸( C18∶3),不饱和脂肪酸含量在84.5%以上,其中亚油酸含量最高,达47.29%。5次平行测定的相对标准偏差( RSD)小于3.81%。并结合相似性分析法比较了4种不同产地的安息香种仁与6种食用油的脂肪酸组成,相似性结果表明不同产地的安息香种仁的脂肪酸组成相似,其脂肪酸组成与食用植物油相近,与玉米油的组成分布最为接近,相似系数在0.987~0.990,且越南安息香种子中人体必需的多不饱和脂肪酸含量( C18∶2和C18∶3)与大豆油和葵花籽油相近,高于一般植物油,具有较高的营养价值。结果表明该法简便、快速、准确,适合越南安息香种子油脂的测定。 相似文献
11.
Fatty acid compositions of oleaster pulp and pit oils were determined by gas chromatography in 4 samples of different varieties. Pit oils were highly unsaturated, containing >90% linoleic, oleic, and linolenic acids, as well as traces of palmitoleic acid. Saturated fatty acids consisted of palmitic and stearic acids with traces of arachidic acid. Pulp oils showed fatty acid compositions entirely different from that of pit oils. They contained 9 saturated fatty acids, C12 to C24, some of them with high quantities, up to 34.9%, of the total fatty acids. Unsaturated fatty acids, mainly oleic and linoleic, with low quantities of palmitoleic and linolenic acids composed about one-third of the total fatty acids. 相似文献
12.
Leaves from soybean (Glycine max (L.) Merr.) plants were assayed to determine if the relationship between temperature and relative fatty acid composition
observed in the seed oil also existed for the triglycerides in the leaf oil. Leaf samples were harvested from eight soybean
lines (A5, A6, C1640, Century, Maple Arrow, N78-2245, PI 123440 and PI 361088B) grown at 40/30,28/22 and 15/ 12°C day/night.
At 40/30 and 28/22°C, seven fatty acids were observed at a level greater than 1.0%. These included the five major fatty acids
found in the seed oil: palmitic (16:0), stearic (18:0), oleic (18:1), linoleic (18:2) and linolenic (18:3) acid; plus two
fatty acids that had retention times the same as palmitoleic (16:1) and γ-linolenic (18:3 g) acid. In addition, an eighth
fatty acid that had a retention time the same as behenic (22:0) acid was found in the leaves of all lines at 15/12°C. Palmitic,
palmitoleic and stearic acid content did not differ significantly over temperatures. The oleic and linoleic acid content were
each highest at 15/12°C, while the γ-linolenic and the linolenic acid content were each highest at 40/30°C. The fatty acid
composition of the triglyceride portion of the leaf oil did not display the same pattern over temperatures as that observed
for seed oil. 相似文献
13.
Determination of the Fatty Acid Composition in Tree Peony Seeds Using Near-Infrared Spectroscopy
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Cui Huliang Cheng Fangyun Peng Liping 《Journal of the American Oil Chemists' Society》2016,93(7):943-952
Tree peonies (Paeonia Sect Moutan DC) are an emerging oil crop because of their high oil and α‐linolenic acid (ALA) content. This research was to investigate the potential use of near infrared reflectance spectroscopy (NIRS) for estimating the major fatty acids contents, such as palmitic acid (C16:0), oleic acid (C18:1), linoleic acid (C18:2) and linolenic acid (C18:3) in tree peonies. A total of 115 small seed samples and 447 single seeds were selected to calibrate the predictive models. NIRS absorbance spectra were collected using a Fourier transform near infrared (FT‐NIR) spectrometer for the small seed samples, and acousto‐optic tunable filter‐near infrared (AOTF‐NIR) for the single seed samples. Statistical analysis was performed with partial least squares (PLS). For the husked samples, C18:3, C18:1 and C18:2 showed the highest correlation coefficient of validation (Rv; = 0.9756, 0.9467 and 0.8485, respectively) and the ratio of performance to deviation (RPD; = 3.58, 1.91 and 2.17, respectively); however, C16:0 did not reach expectations (Rv = 0.7783, RPD = 1.32). For intact samples, C18:3 showed the best prediction (Rv = 0.9096, RPD = 3.14), followed by C18:2 (Rv = 0.8479, RPD = 1.96). The results for C18:1 were poor (Rv = 0.7237, RPD = 1.70). For single seeds, only the results for C18:3 (R = 0.9150, RPD = 1.73) were good in the husked seed samples. It was concluded that NIRS can be used to rapidly assess the content of the major fatty acids in small samples. 相似文献
14.
Benoit Igne Glen R. Rippke Charles R. Hurburgh Jr. 《Journal of the American Oil Chemists' Society》2008,85(12):1105-1113
Whole soybean fatty acid contents were measured by near infrared spectroscopy. Three calibration algorithms—partial least
squares (PLS), artificial neural networks (ANN), and least squares support vector machines (LS-SVM)—were implemented. Three
different validation strategies using independent sets and part of calibration samples as validation sets were created. There
was a significant improvement of the prediction precision of all fatty acids measured on relative concentration of oil compared
with previous literature using PLS (standard error of prediction of 0.85, 0.42, 1.64, 1.67, and 0.90% for palmitic, stearic,
oleic, linoleic and linolenic acids respectively). ANN and LS-SVM methods performed significantly better than PLS for palmitic,
oleic and linolenic acids. Calibration models developed on relative concentrations (% of oil) were compared to prediction
models created on absolute fatty acid concentration (% of weight) and corrected to relative concentration by multiplying by
the predicted oil content. While models were easier to develop in absolute concentration (higher coefficients of determination),
the multiplication of errors with the total oil content model resulted in no net precision improvement. 相似文献
15.
The common unsaturated fatty acids present in many vegetable oils (oleic, linoleic and linolenic acids) can be quantitated by 1H‐nuclear magnetic resonance spectroscopy (1H‐NMR). A key feature is that the signals of the terminal methyl group of linolenic acid are shifted downfield from the corresponding signals in the other fatty acids, permitting their separate integration and quantitation of linolenic acid. Then, using the integration values of the signals of the allylic and bis‐allylic protons, oleic and linoleic acids can be quantitated. The procedure was verified for mixtures of triacylglycerols (vegetable oils) and methyl esters of oleic, linoleic and linolenic acids as well as palmitic and stearic acids. Generally, the NMR (400 MHz) results were in good agreement with gas chromatographic (GC) analyses. As the present 1H‐NMR‐based procedure can be applied to neat vegetable oils, the preparation of derivatives for GC would be unnecessary. The present method is extended to quantitating saturated (palmitic and stearic) acids, although in this case the results deviate more strongly from actual values and GC analyses. Alternatives to the iodine value (allylic position equivalents and bis‐allylic position equivalents) can be derived directly from the integration values of the allylic and bis‐allylic protons. 相似文献
16.
Estimation of Oil Content and Fatty Acid Composition in Cottonseed Kernel Powder Using Near Infrared Reflectance Spectroscopy 总被引:1,自引:0,他引:1
Alfred Quampah Zhuang Rong Huang Jian Guo Wu Hai Ying Liu Jin Rong Li Shui Jin Zhu Chun Hai Shi 《Journal of the American Oil Chemists' Society》2012,89(4):567-575
Oil content and fatty acid composition in 444 ground cottonseed kernel samples were analyzed using near infrared reflectance
spectroscopy (NIRS). Calibration equations were developed for oil and fatty acid contents with the modified partial least
squares (MPLS) regression method. The correlations between NIRS and reference values in external validation were in agreement
with the predictions in calibration. Each equation was assessed based on the relative prediction determinant for external
validation (RPDv). Equations corresponding to total oil content (RPDv = 11.495) and linoleic acid (RPDv = 5.026) showed high accuracy. For palmitic acid (RPDv = 1.914), myristic acid (RPDv = 1.724) and oleic acid (RPDv = 1.999), the equations were predicted with relatively high accuracy while those for palmitoleic acid (RPDv = 0.686), stearic acid (RPDv = 0.792), linolenic acid (RPDv = 0.475) and 1-eicosenoic acid (RPDv = 0.619) were poorly predicted. The equations for traits with RPDv > 1.5 could be reliably used in screening samples for breeding programs. 相似文献
17.
Muhammad Sajjad Iqbal Abdul Ghafoor Inam Ullah Habib Ahmad 《Journal of the American Oil Chemists' Society》2014,91(11):1975-1986
Nigella sativa L. is an annual underutilized crop of enormous significance, it contains more than 100 bioactive constituents having both pharmaceutical and industrial applications. Nigella sativa L. germplasm consisting of 32 genotypes was quantified for palmitic acid, stearic acid, oleic acid, linoleic and linolenic acid and results obtained varied in percentage. Lipid extracted by chloroform methanol 2:1 (24–37 %) was higher compared to n-hexane (18–35 %) and chloroform methanol 1:3 (18–34 %). Extraction with solvent chloroform methanol 2:1 yielded a higher quantity of oil contents, hence recommended. The polyunsaturated fatty acids were higher than monounsaturated fatty acids. Stearic and palmitic acids were positively correlated as were stearic and linoleic acids. It is inferred that breeding for increased stearic acid, linolenic acid and reduced palmitic acid can be achieved through modern breeding methods. The genotypes rich in oil and oleic-linoleic acid, viz., Pk-020545, Pk-020576, Pk-020609, Pk-020620, Pk-020654, Pk-020699, Pk-020720, Pk-020780, Pk-020874 and Pk-020878, have been suggested for crop improvement programs and could augment the supply of edible oil as well as a biofuel substitute with large scale cultivation. 相似文献
18.
Component fatty acids of the oil extracted fromBetula platypbylla Sukatchev var.japonica Hara (Betulaceae) seeds were analyzed by gas liquid chromatography. The predominant fatty acid was linoleic acid (87%), and
together with oleic and linolenic acids the 18-carbon unsaturated acids amounted to 97% of the total acids. 相似文献
19.
Lih-Ling Wang Andrew C. Peng Andrew Proctor 《Journal of the American Oil Chemists' Society》1990,67(8):499-502
Lipids from five cultivars of highbush blueberries (Vaccinium corymbosum L.) were extracted and fractionated into neutral lipids (60–66%), glycolipids (20–22%) and phospholipids (14–18%). The major
fatty acids in all fractions were palmitic (16∶0), oleic (18∶1), linoleic (18∶2), and linolenic (18∶3) acids. All lipid classes
had a large concentration of C18 polyunsaturated acids (84–92%), indicating that blueberries are a rich source of linoleic and linolenic acids. Changes in
the fatty acid composition of neutral lipids and phospholipids were not significantly different among the five cultivars,
but significant differences were noted in the ratios of linoleic and linolenic acids in the glycolipids fraction. 相似文献
20.
Robert L. Wolff 《Journal of the American Oil Chemists' Society》1992,69(2):106-110
The fatty acid compositions of rapeseed and soybean oils marketed in France have been determined by gas liquid chromatography
on a fused-silica capillary column coated with a 100% cyanopropyl polysiloxane stationary phase. Under the operating conditions
employed, methyl esters of linolenic acid geometrical isomers could be separated and quantitated easily without any other
complementary technique. With only one exception, all samples under study (eight salad oils and five food samples) contain
geometrical isomers of linolenic acid in measurable, although variable, amounts. Totaltrans-18:3 acids may account for up to 3% of total fatty acids. This value corresponds to a degree of isomerization (percentage
oftrans isomers relative to total octadecatrienoic acids) of 30%. Examination of our data indicates that the distribution pattern
of linolenic acid geometrical isomers does not depend on the degree of isomerization. The two main isomers always have thec,c,t and thet,c,c configurations. These isomers occur in the almost invariable relative proportions of 47.8±1.7% and 41.1±1.0%, respectively.
The third mono-trans isomer is present in lower amounts−6.5±0.7%. The only di-trans isomer that can be quantitated with sufficient accuracy is thet,c,t isomer (4.9±1.5%). Mono-trans isomers of linoleic acid are also present in these oils. However, their maximum percentages are lower than those determined
for linolenic acid geometrical isomers. In the oils showing the highest degrees of isomerization,trans isomers of linoleic acid account for 0.5% (rapeseed oils) and 1% (soybean oils) of total fatty acids. Taking into account
all data, it would appear that the probability of isomerization of linolenic acid is about 13–14 times that of linoleic acid. 相似文献