Studies of the relationship between the composition of serum fatty acids and blood pressure are complex and controversial. Fatty acids, important constituents of biological membranes, could potentially affect vasoreactivities including blood pressure. In this study the compositions of fatty acids in serum phospholipids were compared between three types of hypertensive subjects (men, pre-menopausal women, and post-menopausal women) and their respective nrmotensive controls. Serum lipids were extracted and phospholipids were separated by thin layer chromatography. The percentage of palmitic acid (16 : 0) in serum phospholipids was significantly higher and the percentage of stearic acid (18 : 0) was significantly lower in all three hypertensive groups, compared with their corresponding control groups. Only in the group of post-menopausal women, palmitic acid was closely associated wish increases in both systolic (SBP) and diastolic blood pressure (DBP), while stearic acid was associated with decreases in both SBP and DBP. The polyunsaturated fatty acids in serum phospholipids behaved differently from saturated fatty acids. The ratios of products / precursor fatty acids, such as $\sumLCPUFA\omega6/18 : 2\omega$6, 20 : 4$\omega$6/18 : 2$\omega$6, ∑LCPUFA$\omega$3/18 : 3$\omega$3 and 22 : 6$\omega$3/20 : 5$\omega$3, were all clearly associated with both SBP and DBP in hypertensive, post-menopausal women. Desaturation and elongation in fatty acid metabolism could affect the bioavailability of eicosanoid precursors. Changes in the constituent fatty acids of phospholipids and eicosanoid precursors may also influence fluidity, ionic transport, hormone receptors and enzyme activities in biological membranes. In conclusion, both systolic and diastolic blood pressure in post-menopausal women was positively associated with the level of palmitic acid, and negatively associated with the level of stearic acid, in serum phospholipids. The relationships between serum phospholipid-$\omega$6 and $\omega$3 series fatty acids and blood pressure in women, especially in post-menopausal women, require further investigation by taking into consideration hormonal status and eicosanoid metabolism. Funker study is needed to determine the value of dietary manipulation of fatty acid constituents of serum phospholipids, relating to hypertension in women.
The results from the determination of contents of chemical components in Schizandra chinensis are as follows. The contents of malic acid and citric acid in Schizandra chinensis was 38,691 and 3,330 ppm/100g dry weight. The contents of total phenolic compounds in Schizandra chinensis was 1.560%. The predominat phenolic acids were cinnamic acid, gentisic acid, coumalic acid, chlorogenic acid and ferulic acid. Contents of crude lipids in Schizandra chinensis. was 160.5mg/g. Most of fatty acids in lipids were oleic acid, linoleic acid and linolenic acid which are unsaturated fatty acids, and palmitic acid which is saturated fatty acid. In case of essential oils, the predominat components in Schizandra chinensis were caryophyllene, calarene, cubebene, acoradiene and ${\beta}$-himachalene
Journal of the Korean Society of Food Science and Nutrition
/
v.20
no.3
/
pp.266-271
/
1991
The salted and dried mullet roe was manufactured by the conventional processing method. The processing conditions were the salting with soybean sauce of 10% NaCl, 1.2cm of thickness, 3m/sec of air velocity, 70% of RH and $20^{\circ}C$ of wind-drying temperature for 20 days. The fractional compositions of free and bound lipids were classified in neutral, Glyco - and phospholipids of the processed roe. The fatty acid content of glycolipids was measured during processing and storage. Major fatty acids of glycolipids were $C_{16:0},\;C_{18:1}\;and\;C_{18:2}$ whose total amount was 7.71mg/100mg occupying 77% of the total fatty acids of glycolipids. The ratio of unsaturated fatty acid to the saturated fatty acid of bound glycolipids was 2.09 and that of free glycolipids was as low as about 0.92. The rations of the polyenoic acids to the monoenoic acids were very low as 0.10-0.78. The essential fatty acids of bound glycolipids were 4.32mg/100mg and a very much decreased content of 1.46mg/100mg at 9 week storage time.
Little information on the cholesterol content and the fatty acid composition of avian species other than chicken is available. This study was conducted to compare the yolk cholesterol content and the fatty acid profiles of some wild birds maintained in captivity on commercial grain-based chicken diets. The concentration of cholesterol/g of yolk as well as the total yolk cholesterol per egg varied among species. Yolk cholesterol concentration, expressed as mg/g of yolk, was highest in chukar, followed by pheasant, guinea fowl and quail, while total yolk cholesterol in an egg was highest in guinea fowl, followed by pheasant, chuckar and quail. An inverse relationship between yolk cholesterol concentration and egg weight was observed among species with an exception of quail. Although major fatty acids of egg yolk were oleic acid, palmitic acid, linoleic acid and stearic acid in all birds, the composition varied among species. Chukar and quail showed higher oleic acid content than pheasant and guinea fowl, while showing lower linoleic acid. Fatty acids of chukar and guinea fowl eggs were more saturated than those of pheasant and quail. Chukar and especially quail had higher monounsaturated fatty acids (MUFA) than pheasant and guinea fowl; in quail egg 51.6% of total fatty acids were MUFA. Polyunsaturated fatty acids (PUFA), essential fatty acids (EFA) and the ratio of PUFA to saturated fatty acid (P/S ratio) were higher in pheasant and guinea fowl than in chukar and quail. Differences in fatty acid profile of triglyceride (TG) among birds were largely similar to those of total lipid. In comparison to TG, phosphatidyl choline (PC) was low in MUFA while high in saturated fatty acids (SFA), PUFA, P/S ratio and EFA. PC was most saturated in guinea fowl egg yolk, followed by chukar, quail and pheasant. PUFA, P/S ratio and EFA in PC were highest in pheasant followed by chukar, guinea fowl and quail. PE was distinguished from PC by its high contents of stearic acid, eicosapentenoic acid (EPA) and docosahexenoic acid (DHA) while low in palmitic, oleic and linoleic acids. In egg yolk of all birds MUFA was significantly lower in PE than in PC except in quail. Compared to other species, quail had a considerably higher content of MUFA in PE at the expense of SFA and PUFA.
Kim, Margarette C. Nogoy;Sun, Bin;Shin, Sangeun;Lee, Yeonwoo;Li, Xiang Zi;Choi, Seong Ho;Park, Sungkwon
Food Science of Animal Resources
/
v.42
no.1
/
pp.18-33
/
2022
Beef contains functional fatty acids such as conjugated linoleic acid and longchain fatty acids. This review summarizes results from studies comparing the fatty acid composition of beef from cattle fed either grass or grain-based feed. Since functional lipid components are contributed through dietary consumption of beef, the fatty acid composition is reported on mg/100 g of meat basis rather than on a percentage of total fat basis. Beef from grass-fed contains lesser total fat than that from grain-fed in all breeds of cattle. Reduced total fat content also influences the fatty acid composition of beef. A 100 g beef meat from grass-fed cattle contained 2,773 mg less total saturated fatty acids (SFA) than that from the same amount of grain-fed. Grass-fed also showed a more favorable SFA lipid profile containing less cholesterol-raising fatty acids (C12:0 to C16:0) but contained a lesser amount of cholesterol-lowering C18:0 than grain-fed beef. In terms of essential fatty acids, grass-fed beef showed greater levels of trans-vaccenic acid and long-chain n-3 polyunsaturated fatty acids (PUFA; EPA, DPA, DHA) than grain-fed beef. Grass-fed beef also contains an increased level of total n-3 PUFA which reduced the n-6 to n-3 ratio thus can offer more health benefits than grain-fed. The findings signify that grass-fed beef could exert protective effects against a number of diseases ranging from cancer to cardiovascular disease (CVD) as evidenced by the increased functional omega-3 PUFA and decreased undesirable SFA. Although grain-fed beef showed lesser EPA, DPA, and DHA, consumers should be aware that greater portions of grain-fed beef could also achieve a similar dietary intake of long-chain omega-3 fatty acids. Noteworthy, grain-fed beef contained higher total monounsaturated fatty acid that have beneficial roles in the amelioration of CVD risks than grass-fed beef. In Hanwoo beef, grain-fed showed higher EPA and DHA than grass-fed beef.
This study was aimed at investigating the differences in chemical composition of antler according to growing days (80 d and 90 d after casting) and sections (upper, middle, base) in elk. Antlers of six bulls (aged 3 years) cutted on day 80 and 90 after casting were used in this trial and compared chemical composition such as crude protein, crude fat, crude ash, calcium, magnesium, amino acids, lipids, and fatty acids. The contents of crude protein and ether extract were higher in antlers cutted on day 80 than in antlers cutted on day 90, but that of crude ash was higher in antlers cutted on day 90. Significantly difference was observed in crude protein content between growing days in middle part of antler (p<0.05). Calcium and magnesium contents were higher on 90 d than 80 d, but there was no significant difference between growing days of antler. Based on the growing period of antler, there were significant differences (p<0.05) in aspartic acid, threonine, valine, leucine, phenylalanine and lysine, and essential amino acids content was higher in antlers cutted on day 80. Total lipid, neutral lipid, and phospholipid contents were higher in antlers cutted on day 80 than in those cutted on day 90, sphingo-phospholipid content was higher than glycerophospholipid content and values was higher in antlers cutted on day 80 than in those cutted on day 90. For total fatty acids, unsaturated fatty acids composition, there was no significant difference between growing periods of antlers, but values was higher on day 80 than on day 90. Essential fatty acids contents were lower in antler cutted on day 90 than antlers cutted on day 80 and higher for upper part than lower part.
The change in fatty acid composition in brain tissue of the second generation rats(Sprague-Dawley strain) was studied using four different fat diets(Corn oil=CO, Soybean oil=SO, Perilla oil=PO, Fish oil=FO, 10% by Wt). The experimental diets were started from pregnancy in four different groups, each consisting of 9 rats. The seound generation rats were fed the same diet as their mothers. Animals were anesthetized with ether at 0, 3, 9 & 16 weeks of age. Whole brains were dissected out, brain tissues were, then, homogenized and lipids were extracted from brain tissues. The fatty acid compositions were measured after methylation by gas-liquid chromatography at 0, 3, 9 and 16 weeks of age of offspring. The changes in the relative concentrations of polyunsaturated fatty acids(PUFA) or more specifically docosahexaenoic acid(22 : 6, $\omega$3, DHA), the major $\omega$3 fatty acid component in rat brain at different age were similar to changes in the amount of DNA in brain tissue showing the maximum value during the lactation. The changes in saturated fatty acid(SFA) content showed a contrasting patten to those of PUFA, while monounsaturated fatty acid(MUFA) increased steadily throughout the experimental period. At birth, the relative concentrations of $\omega$3 series fatty acids the relative concentrations of PUFA, MUFA and SFA converged to very similar values respectively regardless of the dietary fatty acid compositions. In brain tissue, it is of value to note that while changes in relative concentrations of linoleic acid (18 : 2, $\omega$6, LA) and arachidonic acid(20 : 4, $\omega$6, AA) showed a precursor-product-like relationship, $\alpha$-linolenic acid(18 : 3, $\omega$3, $\alpha$-LnA) and DHA showed a different pattern. Even when the $\omega$3 fatty acid content in very low in maternal diet(CO), the second generation rat brain tissues appeared to secure DHA content, suggesting an essential role of this fatty acid in the brain. The fact that a large amount of $\alpha$-LnA in the maternal diet did not have a significant effect on the second generation rat brain $\alpha$-LnA content, indicated that DHA seemed essential component for the brain development in our experimental condition. In all groups, the relative content of $\alpha$-LnA in the brain tissues remained relatively constant throughout the experimental period at the very low level. The study of the specific concentrations and essential role(s) of DHA in each parts of brain tissue is needed in more details.
Among animals, the rabbit is known to be affected most sensitively by dietary changes and to be most susceptible to atherosclerosis. The exact reason is still unknown as to whether the primary cause is intrinsic (tissue itself) or extrinsic such as a blood factor which could be influenced by various dietary means. It is of utmost importance to check the nutritional quality of rabbit meat before it is accepted and adapted as a daily food item. To evaluate nutritional quality of rabbit meat, studies on various aspects of lipid components were carried out in comparison with other animal meats such as beef, pork and chicken also included in the study was the question whether the cooking and storage conditions influence the composition of fatty acids and cholesterol level. Some results and findings are listed below: 1. The content of linoleic acid (18 : 2), one of the essential fatty acids, was much higher in rabbit meat compared to the other meats. The Percentages of this Polyunsaturated fatty acids, was much higher in rabbit meat compared to the other meats. The percentages of this polyunsaturated fatty acid in terms of total fatty acids were $37.3{\pm}3.7$, 5.9, 14.5, and 21.9% for rabbit, beef, pork, and chicken respectively. The degree of unsaturation was high not only in meat but also in liver and adipose tissue of rabbit. The values of iodine number, the indication of degree of unsaturation, were known to be $102{\sim}107$, $32{\sim}47$, $46{\sim}67$, and $55{\sim}77$ for rabbit, beef, pork, and chicken respectively. Such a high proportion of this polyunsaturated fatty acid contained in rabbit meat could be harmful due to their Peroxidation effect. 2. A small amount of lower (short chain) fatty acids was isolated from rabbit tussues, which were not observed in other animal's tissues. The significance of this small amount of short chain fatty acids contained in rabbit meat remained an open question. 3. The concentration of total cholesterol in rabbit meat was similar to that of otherr but the content of esterified cholesterol was higher in rabbit meat. This was probably due to the perference of cholesterol to esterify with unsaturated fatty acids. By roasting the percentage of Polyunsaturated fatty acids was decreased while saturated palmitic acid was proportionally increased. 4 The composition of fatty acids were affected more by dry heat than moist heat. More research should be pursued to improve methods of preservation and storage to prevent possible peroxidation and rancidity problems of rabbit meat. In the meantime, the public should be informed to eat fresh rabbit meat and not to store it for a long period of time. This study was supported by the Ministry of Science and Technology in Korea.
Journal of the Korean Society of Food Science and Nutrition
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v.22
no.3
/
pp.286-290
/
1993
Mullet roe was salted and dried by the conventional processing method. Mullet roe was first salted with soybean sauce containing 10% NaCl and then pressed down to be a 1.2cm of thickness. It was dried at 2$0^{\circ}C$ under 3m/sec of aeration for 20 days. The lipids of the processed roe were fractionated by free and bound phospholipids. The contents of free and bound phospholipids were 9.30mg/100mg and 13.0mg/100mg respectively. The content of bound lipids were rapidly decreased than that of free fatty acids during processing and storaging. The major fatty acids of phospholipids were $C_{l6:0}$, $C_{20:0}$, $C_{16:1}$, $C_{l8:2}$ and $C_{20:5}$ whose contents were 6.64mg/100mg that occupied 72% of the total phospholipids. The ratio for the unsaturated fatty acids to the saturated ones of free phospholipids in fresh roe was 1.53 and it was decreased down to 0.34 in 9 weeks of storage. But the ratio of bound phospholipids was 1.04 of fresh roe and zero in 6 weeks. The content of essential fatty acids in bound phospholipids was 3.85mg/100mg occupying 75% of total essential fatty acids of the fresh roe, but they were totally destroyed during processing.g.g.g.
Comparisons between the Korean native pig(KNP: 75kg of slaughter weight and 240 days of age) versus Landrace(110kg of slaughter and 180 days of age) in dressing and lean meat percentages, compositions of fatty acids and amino acids and sensory evaluations on longissimus muscle are as below. Compared with Landrace, KNP had smaller percentages in dressing and lean meat percentages and a smaller backfat thickness. In retail cuts, KNP had greater percentages in shoulder butt, belly and picnic shoulder and smaller percentages in spareribs, ham and loin muscle. The KNP had greater percentages in crude fat, palmitic(C16:0) and linolenic(C18:3) acids and smaller percentages in oleic(C18:1) and linoleic(C18:2) acids, but total cholesterol content and ratios of saturated and unsaturated fatty acids and essential fatty acids did not differ between the two breeds. In amino acid composition, KNP had a greater percentage in lysine, but smaller percentages in most other amino acids. The KNP had a greater a*(redness) value in longissimus muscle(LM) color and a greater L*(whiteness) value in attached backfat color. Moreover, sensory evaluations on cooked LM showed that KNP had greater flavor, tenderness and springiness, which resulted in a greater overall acceptability. In summary, KNP, compared with Landrace, had smaller dressing and lean meat percentages, a smaller backfat thickness, greater percentages in popular retail cuts, greater percentages in intramuscular fat and an $\omega$-3 component linolenic acid, with no difference in cholesterol content, which, altogether, is considered to be more beneficial for human health.
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