Moon, Soo-Kyung;Lee, Doo-Seog;Yoon, Ho-Dong;Kim, Yeon-Kye;Yoon, Na Young;Kim, In-Soo;Jeong, Bo-Young
Korean Journal of Fisheries and Aquatic Sciences
/
v.45
no.6
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pp.612-618
/
2012
The proximate and fatty acid compositions of the edible portion of three species of cultured freshwater fish (common eel Anguilla japonica, rainbow trout Onchorhynchus mykiss, and Israeli carp Cyprinus carpio) were compared between imports from China and domestically produced specimens. The lipid contents of cultured common eel and rainbow trout were rich in imported fishes (20.4 and 12.2%, respectively) compared with those in domestic ones (16.0 and 8.01%, respectively), while those of Israeli carp were rich only in the domestically produced specimens (8.06 and 3.07%, respectively). There was a negative correlation between the lipid and moisture contents in all fish samples (r =-0.86). The protein contents ranged from 16.6 to 21.3% in domestic fishes and 15.3 to 19.1% in imported ones. The most prominent fatty acids in the fishes were: saturated fatty acids, 16:0, 18:0 and 14:0; monounsaturated fatty acids, 18:1n-9, 16:1n-7 and 18:1n-7; and polyunsaturated fatty acids (PUFA), 18:2n-6, 22:6n-3 (docosahexaenoic acid, DHA), and 20:5n-3 (eicosapentaenoic acid, EPA). The percentage of n-3 PUFA (e.g., DHA, 22:5n-3, EPA, and 18:3n-3) was higher in domestic common eel and Israeli carp than in imported ones, but similar in domestic and imported rainbow trout, and higher in domestic wild rainbow trout than in cultured ones. On the other hand, all of the cultured freshwater fishes contained a relatively large amount of 18:2n-6, which is a characteristic fatty acid in cultured fish lipids.
This study investigated the effects of squid Todarodes pacificus liver oil on the serum lipids and adipose tissue weight of rats. The rats in the soybean oil (SO) group received a basic diet prepared according to the recommendations of the American Institute of Nutrition (AIN-93G), with 7% SO as lipid source. The rats in the Patagonian toothfish Dissostichus eleginoides muscle oil (PTFO) group received 5% PTFO and 2% SO as the lipid source, while the rats in the eco-friendly squid liver oil (EFSO) group received 5% EFSO and 2% SO. EFSO was prepared according to the method outlined in the author's patent. PTFO was extracted from muscle using a physical method in the author's laboratory. The prominent polyunsaturated fatty acids in the dietary oils were 18:2n-6 (54.3%) and 18:3n-3 (5.64%) in SO, DHA (6.77%) and EPA (3.61%) in PTFO, and DHA (26.2%) and EPA (9.94%) in EFSO. After feeding for 4 weeks, the serum lipid levels (e.g., triglyceride, total cholesterol, and low-density lipoprotein cholesterol) of the rats in the EFSO group were significantly reduced as compared with those in the SO group (P<0.05); those of the rats in the PTFO group were also reduced, albeit not significantly, compared with the SO group. On the other hand, the total white adipose tissue (visceral, epididymal, and perirenal) weight was significantly reduced in the EFSO and PTFO groups compared to the SO group. These results demonstrate that EFSO is an effective lipid modifying agent in rat blood, and that EFSO and PTFO have greater anti-obesity effects than SO.
The purpose of this study was to investigate the pattern of individual fatty acid intake and to compare serum lipid levels and total serum fatty acid composition of high school students in Seoul (total : 234 ; male : 91 ; female : 143) In serum lipid levels, total cholesterol (Chol.), HDL-Chol. and LDL-Chol. levels of female students were significantly higher than those of male students and there was no significant difference between High Fish & Low Meat intake (HFLM) and Low Fish & High Meat intake (LFHM) groups. The average fat intake was 22-25 energy % of total subjects and especially, that of LFHM group was 29%, which were over the recommendation level. Although the average P/M/S ratio of dietary fat was 1.1/1.2/1.0, the average range of $\omega6/\omega3$ fatty acid ratio of dietary fat was found to be 17.9-20.7, which was far beyond the suggested range, 4-10. The average intake of cholesterol of total subjects was 360mg. LFHM group had more meats and beverages such as carbonated drinks and tended to have less beans, vegetables and mushrooms. In addition, LFHM group had more energy and fat intake than those of HFLM group, the P/S ratio of dietary fat (0.73) was lower than the recommended ratio. Serum C16 : 0 composition of LFHM group was significantly higher than that of HFLM group, and EPA and DHA composition of HFLM was significantly lower than that of LFHM. Therefore, in HFLM group, the P/S ratio of serum fatty acids was significantly higher and the $\omega6/\omega3$ ratio was lower. Dietary C18 : 0 was negatively correlated with serum EPA and DHA composition. Individual PUFA intake was negatively correlated with serum C16 : 0 and sum of SFA, and positively correlated with serum C18 : $2\omega6(LA)\;,\;sum\;o;\omega6$ and sum of PUFA. Serum C18 : 1, C18 : $3\omega3\; and\; C20\;:\;4\omega6$ (AA) compositions were not correlated with dietary fatty acid. Only serum triglyceride (TG) levels were significantly correlated with serum fatty acid compositions. Sum of SFA, C14 : 0, C16 : 0, sum of MUFA and C18 : 1 compositions were positively correlated with serum TG levels, but LA, AA, sum of PUFA and P/S ratio were negatively correlated with it.
As a part of basic investigation for utilizing by-products derived from seafood processing as a food source, a chemical characteristics of fish bones (cod bone, Alaska pollack bone, yellowfin sole bone, hoki bone, conger eel bone and mackerel bone) were investigated. The crude protein (40.7% on the dry basis) and collagen contents (5.86%, on the dry basis), imino acid composition (189 residues/1,000 residues) of hoki bone were higher than those of the other fish bones, but were lower than those of the animal bone. The crude lipid contents and EPA and DHA compositions of yellowfin sole, conger eel and mackerel bones were $22.8{\sim}43.9%$ on the dry basis and $15.6{\sim}23.8%$, respectively and were lower than those of squid viscera. The major ash components of the fish bones were found to be calcium and phosphorus and the contents in 100 g crude ash were $37.1{\sim}38.6%$ and $18.0{\sim}18.5%$ respectively. The calcium and phosphorus contents in 100 g crude ash of cod and Alaska pollack bones were more than those of the animal bones, as well as the others. It may be concluded, front these results, hoki bone can be effectively utilized as a processing materal of collagen or gelatin and cod and Alaska pollack bones as a calcium source.
Journal of the Korean Society of Food Science and Nutrition
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v.37
no.7
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pp.886-890
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2008
Levels of minerals, vitamin, amino acids, fatty acids and chemical compositions were determined in the fleshy parts that are used for food. The moisture, crude protein, crude lipid, crude ash and carbohydrate contents of masou salmon were $73.6{\pm}0.4$, $17.7{\pm}0.3$, $3.3{\pm}0.2$, $1.3{\pm}0.1$ and $4.1{\pm}0.2%$, respectively. Potassium was the highest followed by phosphorus, calcium and sodium. The vitamin C and E levels in masou salmon were 600 and $200\;{\mu}g/100\;g$, respectively. Sixteen amino acids were detected and essential amino acids among them are threonine, valine, methionine, isoleucine, leucine, phenylalanine, lysine, arginine, and histidine. Oleic acid was the most abundant fatty acid in masou salmon and polyunsaturated fatty acids were EPA, DHA, linoleic acid, $\alpha$-linolenic acid, $\gamma$-linolenic acid and arachidonic acid. These results may offer a scientific basis for the commercial use of masou salmon.
Journal of the Korean Society of Food Science and Nutrition
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v.36
no.5
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pp.651-656
/
2007
Fish-frames which are left after obtaining fillets or muscle during fish processing, consist of useful food components such as muscle, collagen, calcium, eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). This study was carried out to prepare snack using flatfish frame and also to elucidate food component characterization of the snack. The results of heavy metal and volatile basic nitrogen (VBN) content suggested that flatfish frame was a suitable material for preparing snack. The optimal addition ratio of flatfish frame to mix was 3% for preparing snack according to the results of VBN content, water activity and sensory evaluation. The major fatty acids of the snack with 3% flatfish frame (SFF) were 16:0 and 18:0 as saturates, 18:1n-9+7 as monoenes, and 18:2n-6 and 18:3n-3 as polyenes, while EPA and DHA were contained in small amount SFF. Total amino acid content (9,281.9 mg/100 g) of the SFF was higher than that of the snack without flatfish frame (7,791.3 mg/100 g) and the major amino acids were aspartic acid, glutamic acid, proline and leucine. The calcium and phosphorus contents of SFF were 492.3 mg/100 g and 270.3 mg/100 g, respectively. The Ca/P of SFA was 1.82 which is a good ratio for the absorption of calcium. The SFF was superior in total amino acid, calcium and phosphorus contents compared to the snack without flatfish frame.
Jeong, Sewon;Kim, Ji Yeon;Paek, Ju Eun;Kim, Joohee;Kwak, Jin Sook;Kwon, Oran
Journal of Nutrition and Health
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v.46
no.3
/
pp.226-238
/
2013
Omega-3 polyunsaturated fatty acids are essential fatty acids because humans cannot synthesize them de novo and must obtain them in their diet. Fish and fish oil are rich sources of omega-3 fatty acids, including eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). Significant evidence of the beneficial role of dietary intake of omega-3 fatty acids in blood flow has been reported and putative mechanisms for improvement of blood flow include anti-thrombotic effects, lowered blood pressure, improved endothelial function, and anti-atherogenic effects. Edible oils containing omega-3 fatty acids were registered as functional ingredients in the Korea Health Functional Food Code. Although omega-3 fatty acids have been evaluated by the Korea Food and Drug Administration (KFDA) based on scientific evidence, periodic re-evaluation may be needed because emerging data related to omega-3 fatty acids have accumulated. Therefore, in this study, we re-evaluated scientific evidence for the effect of omega-3 fatty acids as a functional ingredient in health functional food on improvement of blood flow. A comprehensive literature search was conducted for collection of relevant human studies using the Medline and Cochrane, KISS, and IBIDS databases for the years 1955-2012. Search keywords were used by combination of terms related to omega-3 fatty acids and blood flow. The search was limited to human studies published in Korean, English, and Japanese. Using the KFDA's evidence based evaluation system for scientific evaluation of health claims, 112 human studies were identified and reviewed in order to evaluate the strength of the evidence supporting a relation between omega-3 fatty acids and blood flow. Among 112 studies, significant effects on improvement of blood flow were reported in 84 studies and the daily intake amount was ranged from 0.1 to 15 g. According to this methodology of systematic review, we concluded that there was possible evidence to support a relation between omega-3 fatty acid intake and blood flow. However, because inconsistent results have recently been reported, future studies should be monitored.
The degree of platelet aggregation, thromboxane B2(TXB2)formation and fatty acid composition of platelet phospholipids(PL) were investigated in 24 healthy male subjects who for five weeks consumed either corn oil(CO) rich in linoleic acid(LA), perilla oil (PO) rich in $\alpha$-linoleic acid($\alpha$-LAN), or canola oil(CNO) rich in oleic acid(OA) as a major fat source. Total fat intake was 30% of total calories and prescribed oil intake of each dietary group was 50% of the total fat intake. In the CO group, significantly decreased contents of polyunsaturated fatty acids(PUFA), n-6 PUFA, n-3 PUFA and eicosapentanoic acid(EPA) were observed, and significantly increased contents of OA and saturated fatty acids(SFA) were observed in platelet PL after 3 weeks and 5 weeks of dietary treatment. In the PO group, contents of OA and docosahexanoic acid(DHA) were increased, and the ratio of n-6/n-3 was decreased significantly in platelet PL after dietary treatment. The CNO group showed significatnlty decreased contents of PUFA, P/S ratio, n-6 PUFA, LA,(EPA+DHA)/arachidonic acid(AA), and significantly increased SFA contents after 3 weeks of the oil-based diet. The dietary-induced effects on fatty acid composition of platelet PL were observed mostly after 3 weeks of the oil-based diet. The dietary-induced effects on fatty acid composition of platelet PL were observed mostly after 3 weeks. Plasma TXB2 levels were increased after 3 and 5 weeks of dietary treatment. However, only the CO and CNO groups showed significantly increased plasma TXB2 levles after 3 and 5 weeks of dietary treatment. However, only the CO and CNO groups showed significantly increased plasma TXB2 levels after 5 weeks of experimental diets, when compared with initial values. Degree of platelet aggregation increased only in the CO group after dietary treatment. As a result, at week 5 the degree of platelet aggregation of the CO group was significantly higher than those of the PO and CNO groups. Among the three oil-based diets, the PO-based diet seems to have beneficial effects on atherosclerosis by influencing plasma TXB2 levels and the degree of platelet aggregation, while the CO-based diet showed the most adverse effects. Our results imply that plasma TXB2 levels might be affected by dietary fatty acid composition.
Conjugated linoleic acid(CLA) is a collective term for a group of positional (c8, c10; c9, c11; c10, c12, and c11, c13) and geometric(cis,cis; cis,trans; trans,cis; and trans,trans) isomers of octadecadienoic acid (linoleic acid) with conjugated double bond system. CLA has been shown to have a variety of biological effects. Major effects of CLA on health, such as anti-cancer, anti-oxidation, anti-atherosclerosis and improving immuno-responses, might be derived or partially derived from the alternated lipid metabolism after CLA feeding. Most of studies on the effect of CLA on fat metabolism are concentrated on rats, mice, pigs and other mammals. The CLA inhibited carcinogen-induced neoplasia in several animal models and inhibited the proliferation of human malignant melanoma, colorectal and breast cancer cells and CLA reduced the atherosclerosis. Several studies have determined the antioxidant property of CLA; however, the property still remains controversial. Some of the studies have shown that CLA acted as an antioxidant, whereas some other studies have demonstrated that CLA might be a prooxidant. Several studies suggested that CLA could reduce fat accumulation in mammals. CLA was suggested to promote muscle growth and reduce fat deposition in mouse, and improve feed efficiency in rats. CLA has been shown to inhibit the activity of stearoyl-CoA reductase. CLA also reduced the content of arachidonic acid. Since arachidonic acid, and eicosapentaenoic acid (EPA) and docosahexenoic acid (DHA) are synthesized by different pathways, reducing the synthesis of arachidonic acid may not mean reducing that of EPA and DHA. Many sutdies have been shown biological effects of CLA. Therefore, further research is needed to answer the following questions: 1) how to synthesize the new CLA by new methods, 2) why CLA has shown biological effects, 3) how to increase CLA effects in animal products.
Omega-3 unsaturated fatty acids, including eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), are found in fish and fish oil. Recent studies have shown that omega-3 fatty acids are effective in cancer, cardiovascular disease, immune system, cirrhosis, and nervous system disorders. In particular, omega-3 was also reported to help improve hyperlipidemia and liver function tests. On the other hand, there are few cases in Korea. This study examined whether omega-3 is effective in improving hyperlipemia and liver function by taking 1 gm/day for 2 weeks. As a result, AST was decreased in the liver function test, and GGT related to alcoholic hepatitis and fatty liver showed significant results. Omega-3 has been shown to help improve the liver function. The triglyceride, total cholesterol, and low density cholesterol associated with cardiovascular disease decreased after omega-3 ingestion, particularly high density cholesterol. Omega-3 has also been shown to improve the hyperlipidemia. Comparisons between males and females before and after the ingestion of omega-3 showed significant results in AST (P<0.01) from the male group and in GGT (P<0.01) and high density cholesterol (P<0.01) from the female group. As a result, omega-3 intake can help control and improve liver function and hyperlipidemia.
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