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1.
Rice (Oryza sativa L.) bran contains valuable nutritional constituents, which include lipids with health benefits. A germplasm collection consisting
of 204 genetically diverse rice accessions was grown under field conditions and evaluated for total oil content and fatty
acid (FA) composition. Genotype effects were highly statistically significant for lipid content and FA profile (P<0.001). Environment (year) significantly affected oil content (P<0.05), as well as stearic, oleic, linoleic, and linolenic acids (all with P<0.01 or lower), but not palmitic acid. The oil content in rice bran varied relatively strongly, ranging from 17.3 to 27.4%
(w/w). The major FA in bran oil were palmitic, oleic, and linoleic acids, which were in the ranges of 13.9–22.1, 35.9–49.2,
and 27.3–41.0%, respectively. The ratio of saturated to unsaturated FA (S/U ratio) was highly related to the palmitic acid
content (r
2=0.97). Japonica lines were characterized by a low palmitic acid content and S/U ratio, whereas Indica lines showed a high
palmitic acid content and a high S/U ratio. The variation found suggests it is possible to select for both oil content and
FA profile in rice bran. 相似文献
2.
Variation in Fatty Acid Compositions, Oil Content and Oil Yield in a Germplasm Collection of Sesame (Sesamum indicum L.) 总被引:1,自引:0,他引:1
Bülent Uzun Çiğdem Arslan Şeymus Furat 《Journal of the American Oil Chemists' Society》2008,85(12):1135-1142
The variation in oil content, oil yield and fatty acid compositions of 103 sesame landraces was investigated. The landraces
varied widely in their oil quantity and quality. The oil content varied between 41.3 and 62.7%, the average being 53.3%. The
percentage content of linoleic, oleic, palmitic and stearic acids in the seed oil ranged between 40.7–49.3, 29.3–41.4, 8.0–10.3
and 2.1–4.8%, respectively. Linolenic and arachidic acids were the minor constituents of the sesame oil. Linoleic and oleic
acids were the major fatty acids of sesame with average values of 45.7 and 37.2%, respectively. The total means of oleic and
linoleic acids as unsaturated fatty acids of sesame were about 83% which increases the suitability of the sesame oil for human
consumption. The superiority of the collection was observed in oil content. The oil content of a few accessions was above
60%, proving claims that some varieties of sesame can reach up to 63% in oil content. The accessions with the highest oil
content were relatively richer in the linoleic acid content while there were some landraces in which linoleic and oleic acid
contents were in a proportion of almost 1:1. The results obtained in this study provide useful background information for
developing new cultivars with a high oil content and different fatty acid compositions. Several accessions could be used as
parental lines in breeding programmes aiming to increase sesame oil quantity and quality. 相似文献
3.
Afaf Kamal-Eldin Lars Åke Appelqvist 《Journal of the American Oil Chemists' Society》1994,71(2):135-139
Seeds from different collections of cultivatedSesamum indicum Linn. and three related wild species [specifically,S. alatum Thonn.,S. radiatum Schum and Thonn. andS. angustifolium (Oliv.) Engl.] were studied for their oil content and fatty acid composition of the total lipids. The wild seeds contained
less oil (ca. 30%) than the cultivated seeds (ca. 50%). Lipids from all four species were comparable in their total fatty acid composition, with palmitic (8.2–12.7%), stearic
(5.6–9.1%), oleic (33.4–46.9%) and linoleic acid (33.2–48.4%) as the major acids. The total lipids from selected samples were
fractionated by thin-layer chromatography into five fractions: triacylglycerols (TAG; 80.3–88.9%), diacylglycerols (DAG; 6.5–10.4%),
free fatty acids (FFA; 1.2–5.1%), polar lipids (PL; 2.3–3.5%) and steryl esters (SE; 0.3–0.6%). Compared to the TAG, the four
other fractions (viz, DAG, FFA, PL and SE) were generally characterized by higher percentages of saturated acids, notably palmitic and stearic
acids, and lower percentages of linoleic and oleic acids in all species. Slightly higher percentages of long-chain fatty acids
(20∶0, 20∶1, 22∶0 and 24∶0) were observed for lipid classes other than TAG in all four species. Based on the fatty acid composition
of the total lipids and of the different acyl lipid classes, it seems thatS. radiatum andS. angustifolium are more related to each other than they are to the other two species. 相似文献
4.
Ali Moayedi Karamatollah Rezaei Sohrab Moini Behnam Keshavarz 《Journal of the American Oil Chemists' Society》2011,88(4):503-508
Chemical compositions of oils extracted from three wild almond species [Amygdalus scoparia from Beyza, Iran (AZ); A. scoparia from Borazjan, Iran (AJ), and A. hausknechtii from the Firuzabad region, (AH)] and a domestic species, A. dulcis from Estahban, Iran (AD), as a reference, were investigated. Total oil content ranged from 44.4% in AJ to 51.4% in AD. Saponification
numbers were in the range of 173.5 (for AJ) to 192.9 for AD. Oxidative stability, total phenolic contents and total wax contents
were found to be within the ranges 11.7–14.0 h, 33.9–43.2 and 2.05–2.53%, respectively. The main monounsaturated fatty acid
(MUFA) was oleic acid ranging from 66.7% for AH to 69.7% for AZ. The only polyunsaturated fatty acid (PUFA) was linoleic acid
ranging from 18.2% for AZ to 23.0% for AD. The major saturated fatty acid was palmitic acid. MUFA contents and MUFA to PUFA
ratio in the oils from wild almond species as well as those in the domestic one were found at higher levels than those in
the common vegetable oils such as soybean, various nut oils, and also those from the seeds of pomegranate, grape, date and
sesame. Oils from wild almond species investigated here are rich in oleic acid and can be considered as potential vegetable
oils in the human diet. 相似文献
5.
Klaus Eder Huldreich Nonn Holger Kluge 《European Journal of Lipid Science and Technology》2001,103(10):668-676
High concentrations of polyunsaturated fatty acids (PUFA) in meat have detrimental effects on its technical properties. The present study was carried out to investigate whether PUFA levels in pork can be reduced by increasing the concentrations of oleic acid in pig diets. To this end a bifactorial experiment was carried out with 48 female growing finishing pigs. Six different diets were used with two different concentrations of linoleic acid (12 vs. 24 g/kg) and three different concentrations of oleic acid (12 vs. 18 vs. 24 g/kg). The experiment started at a body weight (BW) of 58 kg and continued until 115 kg BW. The fatty acid composition of total lipids of backfat, perirenal fat and musculus (m.) longissimus dorsi was analysed. Concentrations of linoleic acid and total PUFA in backfat and perirenal fat were affected only by the dietary linoleic acid content but not at all by the dietary oleic acid content. Increasing the dietary concentration of oleic acid raised the level of oleic acid in those tissues at the expense of saturated fatty acids, suggesting competition between monounsaturated fatty acids and saturated fatty acids for incorporation into triglycerides. At the low dietary linoleic acid concentration, the percentages of linoleic acid and total PUFA in total lipids of m. longissimus dorsi were also unaffected by the dietary oleic acid content. In contrast, at the high dietary linoleic acid concentration, percentages of linoleic acid and total PUFA of the m. longissimus dorsi were reduced by increasing the dietary concentration of oleic acid, suggesting that oleic acid and linoleic acid compete for incorporation into muscle lipids. Thus, at high dietary linoleic acid levels the fatty acid composition of the m. longissimus dorsi was favourably affected by high dietary oleic acid concentrations; in backfat and perirenal fat, however, no beneficial effect of high dietary oleic acid levels was seen. 相似文献
6.
Mohammad R. Sabzalian Ghodratollah Saeidi Aghafakhr Mirlohi 《Journal of the American Oil Chemists' Society》2008,85(8):717-721
Seeds of six safflower (C. tinctorius L.) genotypes and 19 accessions of two wild species were analyzed for oil and fatty acid composition. Oil content ranged
from 29.20 to 34.00, 20.04 to 30.80 and 15.30 to 20.80% in C. tinctorius, C. oxyacantha Bieb. and C. lanatus L., respectively. The main fatty acids of oleic, linoleic, palmitic and stearic acids composed 96–99% of the total fatty acids
in all species. The sum of myristic, palmitoleic, arachidic, and behenic fatty acids in oil of the species ranged from 0.43
to 0.57%. The oleic acid in seed oil of C. tinctorius, C. oxyacantha and C. lanatus ranged from 12.24 to 15.43, 14.11 to 19.28 and 16.70 to 19.77%, respectively. The corresponding ranges for linoleic acid
were 71.05 to 76.12, 63.90 to 75.43 and 62.47 to 71.08%. Palmitic acid in seed oil varied from 5.48 to 7.59% in C. tinctorius, 6.09 to 8.33% in C. oxyacantha and 7.44 to 8.78% in C. lanatus. The stearic acid of the seed oil showed a variation of 1.72 to 2.86, 2.50 to 4.87 and 3.14 to 4.79% in genotypes of these
species, respectively. The fatty acids composition of oil among the cultivated and wild species were not considerably different,
indicating that seed oil of the wild safflower is possibly suitable for human consumption and industrial purposes. 相似文献
7.
P. F. Knowles 《Journal of the American Oil Chemists' Society》1972,49(1):27-29
Current research on the fatty acid composition of the seed oil of safflower (Carthamus tinctorius L.) has shown the following: (1) there is a possibility that the oleic acid content can be increased above 80%, though probably
not above 85%, by use of modifying genes and the major geneol; (2) wild species do not look very promising as a source of genes for modifying fatty acid composition; (3) commercially
grown high linoleic and high oleic types are temperature stable; (4) an experimental type with about equal amounts of oleic
and linoleic acids is responsive to temperature, with high temperature increasing oleic acid and low temperature increasing
linoleic acid; and (5) stearic acid in another experimental type with higher levels of stearic acid (5–10%) is reduced by
low temperatures.
One of seven papers presented at the Symposium, “The Plant Geneticist’s Contribution Toward Changing Lipid and Amino Acid
Composition of Oilseeds,” AOCS Meeting, Houston, May 1971. 相似文献
8.
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
9.
Seed samples of 54 species of wild Cruciferae were newly collected from natural populations of the west Mediterranean and
adjacent areas in a search for “new” oil crops. Oil contents and fatty acid compositions were determined simultaneously by
gas liquid chromatography using methyl heptadecanoate as the internal standard. The study revealed large variations in oil
content (6–48.8%), oleic acid (5–31.3%), linoleic acid (2–24.8%), linolenic acid (1.7–64.1%), and erucic acid (0–55.1%). Correlation
coefficients between component fatty acids inter se and oil content were determined separately for all species, the tribe
Brassiceae, and the genusBrassica. The promising species identified are being studied further. 相似文献
10.
Pure cardiolipins (1,3-diphosphatidylglycerol) were prepared from mitochondria of heart, liver and kidney from 21-day-old
male Wistar rats and submitted toNaja naja venom phospholipase A2 (EC 3.1.1.4) action. Incubation conditions were controlled carefully, and a complete hydrolysis of cardiolipin to lysocardiolipin
{di [1 (1″) acylsn-glycero-3-phosphoryl] 1′, 3′-sn-glycerol} and fatty acids from positions 2 (2″) was obtained in less than two hr practically without side reactions. Cardiolipins
from the three organs contained low levels of saturated fatty acids; stearic acid accounted for 0.4–0.7% and palmitic acid
for 1.4–3.5% of total fatty acids. These percentages apparently depended on the organ. In all three cases, linoleic acid was
the major component, but its percentage varied from 62–78% of total fatty acids. Acyl chains linked to positions 1 (1″) of
all three cardiolipin preparations exhibited a similar pattern; they were composed of linoleic acid for 85–89%. This fatty
acid also was the main component esterified at position 2 (2″), but its percentage was much more variable: from 39.8% in heart
to 51.2% in kidney and 67.8% in liver mitochondria. The remaining acids comprised octadecenoic and polyunsaturated fatty acids
with more than 18 carbon atoms in different proportions. As opposed to other phospholipids,cis-vaccenic acid, and not oleic acid, was the main octadecenoic acid present in cardiolipins.
Octadecenoic acids were nine- to 10-fold more concentrated at positions 2 (2″) than at positions 1 (1″). The percentage ofcis-vaccenic acid was four- to five-fold higher than that of oleic acid at positions 2 (2″), whereas oleic acid dominated at
positions 1 (1″). From results presented in this study and selected literature data, it may be concluded that fatty acids
are asymmetrically distributed in cardiolipins of different origins, with linoleic acid showing a definite preference for
position 1 (1″). 相似文献
11.
F. Jahaniaval Y. Kakuda M. F. Marcone 《Journal of the American Oil Chemists' Society》2000,77(8):847-852
This paper reports the fatty acid and triacylglycerol (TAG) compositions of five Amaranthus accessions (RRC1011, R149, A.K343, A.K432, and A. K433) representing two species and a cross between one of these and a third species. Seed oils of these were analyzed by
gas chromatography and reversed-phase high-performance liquid chromatography, and their compositional properties compared
with buck-wheat (Fagopyrum esculentum), corn (Zea mays), rice bran (Oryza sativa), soybean (Glycine max L. Merr.), sesame (Sesamum indicum), quinoa (Chenopodium quinoa), and cottonseed (Gossypium hirsutum) oils. All Amaranthus accessions were relatively high in palmitic (21.4–23.8%) and low in oleic (22.8–31.5%) and linolenic (0.65–0.93%) acids when
compared to most of the grain and seed oils. The fatty acid composition of Amaranthus accessions K343, K433, and K432 (group I) were different from R149 and RRC1011 (group II) in mono and polyunsaturated fatty
acids, but the saturate/unsaturate (S/U) ratios were very similar. All Amaranthus accessions were similar in TAG type, but showed slight differences in percentage. High similarities in UUU, UUS, and USS
composition were observed among Amaranthus K343, K433 and K432, and between R149 and RRC1011. The fatty acid compositions of Amaranthus oil (group I) and cottonseed oil were similar, but their TAG compositions were different. The grain and oilseed oils were
different from each other and from the Amaranthus accessions oils in terms of fatty acid composition, S/U, and TAG ratios. The UUU, UUS, and USS percentages were very diverse
in grain and seed oils. The percentages of squalene in the TAG sample from the Amaranthus accessions were 8.05% in K343, 11.10% in K433, 11.19% in K432, 9.96% in R149, and 9.16% in RRC1011. Squalene was also tentatively
identified in quinoa and ricebran oils at levels of 3.39 and 3.10%, respectively. 相似文献
12.
Ikechukwu E. Ezeagu Klaus J. Petzke Erika Lange Cornelia C. Metges 《Journal of the American Oil Chemists' Society》1998,75(8):1031-1035
As the search for alternative sources of food to alleviate hunger continues, this study was undertaken to determine the fat
content and the fatty acid composition of 15 lesser-known wild tropical seeds gathered in Nigeria. Results were contrasted
with five tropical soybean varieties (Glycine max). The fat content varies from less than 1% (Pterocarpus santalinoides, Daniellia ogea) to 59% (Entandrophragma angolense). The fatty acid composition of most of the wild and mostly leguminous seeds differed considerably, compared to the composition
of tropical soybeans. The oil of Adansonia digitata, Prosopis africana, Afzelia lebbeck, Enterolobium cyclocarpium, and Sesbania pachycarpa contained high proportions of linoleic and oleic acid as well as palmitic and linolenic acid. Seeds of Milletia thonningii, Lonchocarpus sericeus, and S. pachycarpa were much higher in linolenic acid and relatively poor in linoleic acid, compared to soybeans. The content of saturated fatty
acids was higher than that of soybeans, resulting in lower polyunsaturated/saturated (P/S) ratios (0.83–2.12) than observed
in soybeans (P/S=3.4), with the exception of the composition of S. pachycarpa (P/S=3.15). Some of these less familiar wild seeds could be used as sources for industrial or edible oils, provided that
possible toxic constituents could be removed. 相似文献
13.
The lipids of the common house cricket,Acheta domesticus L., have been examined with the following results. The fatty acids associated with the lipid extracts do not change significantly
from the third through the eleventh week of the crickets' postembryonic life. The major fatty acids are linoleic (30–40%),
oleic (23–27%), palmitic (24–30%), and stearic acids (7–11%). There are smaller amounts of palmitoleic (3–4%), myristic (∼1%),
and linolenic acids (<1%). The fatty acid composition of the cricket lipids reflects but is not identical to the fatty acids
of the dietary lipids: linoleic (53%), oleic (24%), palmitic (15%), stearic (3%), myristic (2%), and linolenic acid (2%).
The amount of triglycerides present in the crickets increases steadily from the second through the seventh or eighth week
of postembryonic life, then drops sharply. Other lipid classes, such as hydrocarbons, simple esters, diglycerides, monoglycerides,
sterols, and free fatty acids remain about constant. The composition of the fatty acids associated with the tri-, di-, and
monoglycerides and the free fatty acid fraction are all about the same. The fatty acids associated with the simple esters
are high in stearic acid.
Postdoctoral Research Associate, Department of Chemistry, University of Michigan, 1965–1967. 相似文献
14.
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
15.
A. C. Joshi B. K. Chopra L. C. Collins V. M. Doctor 《Journal of the American Oil Chemists' Society》1973,50(8):282-283
Gas chromatographic determination of the fatty acids in the seeds of soybean (Glycine max) showed mainly linoleic, oleic and palmitic acids with linoleic acid being the major component. Changes in the distribution
of fatty acids were measured during germination in the cotyledons and roots. A decrease in palmitic and oleic acids was observed
in the cotyledons from 6 to 12 days, while linoleic acid increased during the same period. In roots also, the major fatty
acid was linoleic acid, while palmitic and linolenic acids were higher in roots in comparison with the cotyledons. During
the 3–12 days of germination period, no major changes in the distribution pattern of fatty acids were observed in the roots.
The possible significance of these changes is discussed. 相似文献
16.
Francie G. Dunlap Pamela J. White Linda M. Pollak 《Journal of the American Oil Chemists' Society》1995,72(9):989-993
The fatty acid composition of corn oil can be altered to meet consumer demand for “healthful” fats. The first step in altering
the oils is to survey existing corn breeding materials for fatty acid composition. The Latin American Maize Project (LAMP),
an international program designed to evaluate the agronomic characteristics of maize accessions in Latin American and U.S.
germplasm banks for future use, provides useful starting materials. LAMP was based on the cooperative efforts of 12 countries.
In a two-stage evaluation, the project identified the highest-yielding open-pollinated top 20% of populations, then approximately
the top 5% of those 20%. Twenty of the populations from four countries with temperate climates were randomly selected for
fatty acid analysis. The populations were from United States, Chile, Argentina, and Uruguay. Fifty S1 lines from each population were randomly chosen for analysis for a total of 1,000 genotypes sampled. Statistical differences
in fatty acid composition were computed among the 20 populations and among the four countries. The findings showed a wide
range of fatty acid profiles present in unadapted, elite corn breeding materials with ranges for each fatty acid as follows:
palmitic acid, 6.3–18.2%; stearic acid, 0.9–4.5%; oleic acid, 18.5–46.1%; linoleic acid, 36.6–66.8%; linolenic acid, 0.0–2.0%;
and arachidic acid, 0.0–1.4%. Several populations were significantly different from the others. Some lines had unusual fatty
acid compositions, including one with 8.3% total saturates and another with 20.2% total saturates. This study shows that existing
corn breeding materials could be used to produce high- and low-saturate oils, but other methods would probably be required
to produce a high-oleic corn oil. 相似文献
17.
A. R. Chowdhury R. Banerji G. Misra S. K. Nigam 《Journal of the American Oil Chemists' Society》1984,61(6):1023-1024
The seeds of 8 plant species of Mimosaceae were studied for their fat and protein contents and fatty acid and mineral compositions.
The oil fromEntada phaseoloides contained 14 newly identified acids in addition to 8 previously reported. Six seed oils were rich in oleic and linoleic acid
as the sum of 18:1 and 18:2 ranged from 64.4–78.5%. 相似文献
18.
Cloning of Δ12- and Δ6-desaturases from Mortierella alpina and recombinant production of γ-linolenic acid in Saccharomyces cerevisiae 总被引:2,自引:0,他引:2
Yung-Sheng Huang Sunita Chaudhary Jennifer M. Thurmond Emil G. Bobik Jr. Ling Yuan George M. Chan Stephen J. Kirchner Pradip Mukerji Deborah S. Knutzon 《Lipids》1999,34(7):649-659
Two cDNA clones with homology to known desaturase genes were isolated from the fungus Mortierella alpina. The open reading frame in one clone encoded 399 amino acids and exhibited Δ12-desaturase activity when expressed in Saccharomyces cerevisiae in the presence of endogenous fatty acid substrate oleic acid. The insert in another clone contained an open reading frame
encoding 457 amino acids and exhibited Δ6-desaturase activity in S. cerevisiae in the presence of exogenous fatty acid substrate linoleic acid. Expression of the Δ12-desaturase gene under appropriate
media and temperature conditions led to the production of linoleic acid at levels up to 25% of the total fatty acids in yeast.
When linoleic acid was provided as an exogenous substrate to the yeast cultures expressing the Δ6-desaturase activity, the
level of γ-linolenic acid reached 10% of the total yeast fatty acids. Co-expression of both the Δ6- and Δ12-desaturase cDNA
resulted in the endogenous production of γ-linolenic acid. The yields of γ-linolenic acid reached as high as 8% of total fatty
acids in yeast. 相似文献
19.
Fatty acid composition of Iranian citrus seed oils 总被引:1,自引:0,他引:1
Fatty acid compositions of seed oils from eight Iranian citrus fruits were determined. The ranges of values for major fatty
acids were 21.8–29.4% palmitic, 3.1–7.60% stearic, 0.3–1.3% palmitoleic, 23.5–32.3% oleic, 33.5–39.8% linoleic, and 3.1–7.6%
linolenic. Low amounts (up to 0.1%) of myristic and arachidic acids and traces of a few unidentified ones constituted minor
fatty acids. 相似文献
20.
Fatty acid composition and its relationship with physicochemical properties of pecan (Carya illinoensis) oil 总被引:1,自引:0,他引:1
J. F. Toro-Vazquez M. A. Charó-Alonso F. Pérez-Briceño 《Journal of the American Oil Chemists' Society》1999,76(8):957-965
The composition and physicochemical properties of pecan (Carya illinoensis) kernels and oils from different native trees of the central region of Mexico were investigated. The main compositional characteristic
of the kernel was the high lipid content (70–79% w/w on dry basis) with elevated concentration of oleic acid (55–75% w/w).
The results confirmed the relationship in the biosynthesis of linoleic and linolenic acids from oleic acid existing in oilseeds.
Our results indicate that in pecans such relationship is a function of pecan tree age. The proportion of oleic, linoleic,
and linolenic fatty acids determined the oxidative stability, viscosity, and melting/crystallization behavior of pecan oil.
In general, these properties in pecan oils were similar or superior to extra-virgin olive oil and unrefined sesame oil. Although
all native pecan oils studied showed a significant concentration of oleic acid, a particular group of native Mexican pecan
trees produces an oil with a fatty acid composition with the nutritional appeal that consumers demand nowadays (i.e., very
high oleic acid, 60–75%), with excellent natural oxidative stability (i.e., induction time for oxidation between 8.5 and 10.8
h), and substantially higher concentrations of α-, γ-, and δ-tocopherol than in pecan varieties previously reported in the
literature. 相似文献