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SEPARATION OF ORGANIC ACIDS BY CAPILLARY ZONE ELECTROPHORESIS AND ELECTROCHEMICAL DETECTION IN FRUIT JUICES

Acta Nutrimenta Sinica.1956;0(03):-.

Objective: The method for separation by capillary zone electrophoresis (CZE) and electrochemical determination of organic acids in fruit juices was developed. Method: In this system, 0.2mmol/L cetylpyridinium bromide (CPB) was used as an electro osmotic flow (EOF) modifier to reverse the direction of EOF. cyclodexfrin ( -CD) was added into running buffer to improve the separation efficiency. Then, the optimal separation conditions were achieved and successfully employed to separate six organic acids, including oxalic, malic, tartaric, succinic, fumaric acid and citric acids. One nano palladium modified carbon paste electrode was used for determination. Results: The calibration curves for all organic acids studied were linear with 2-3 orders (1 10–6-1.0 10–3 mol/L) of magnitude and all the detection limits (S/N=3) were below 2 mol/L. The RSD was between 1.05%-2.15% , and recovery was 93.4% . Conclusion: CZE separation combined with electrochemical detection is suitable for simultaneous determination of organic acids in fruit juices quickly with high sensitivity and selectivity.

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The Effects of Nutrimental Prescribed Diet on Antioxidant Potential in Mice

Muxin GONG ; Lei WANG ; Xin CHEN ; Tetsuya KONISHI

Acta Nutrimenta Sinica.1956;0(03):-.

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STUDY ON THE SENSIBILITY OF LPL-PVUⅡ GENE POLYMORPHISM TO INTERVENTION OF COARSE GRAIN FOOD IN DYSLIPIDEMIA POPULATION

Xuefen CHEN ; Chengkai ZHAI ; Ling JIANG ; Hui ZUO

Acta Nutrimenta Sinica.1956;0(03):-.

Objective: To explore the different genotypes’ susceptibility to intervention of coarse grain food in dyslipdemia population. Method: 409 middle and old aged residents with blood lipoprotein abnormalities were randomized to 2 groups: the intervention group (230 subjects) and the control group (179 subjects). Everyone of the former group was given a steamed bread of coarse grain food per day and health education once every month; while the control group was only given health education. Intervention period was 6 months. The genotypes of LPL-Pvu Ⅱ of the intervention group were analyzed by PCR-RFLP (restriction fragment length polymorphism) technique. Results: All indices in intervention group except WHR were improved after intervention. BMI, WHR, SBP, DBP, serum TG were significantly lower than control group; while serum HDL-C was significantly higher than control group after intervention. Among all genotype groups, the P+/P+ group was more sensible for the change of serum TG and more significant in the effect of improving blood lipids than the P-/P- group; and the susceptibility of change for TC and HDL-C in serum was least in the P-/P- group. Conclusion: There are good intervention effects of coarse grain food in dyslipdemia population. The susceptibilities to improve blood lipids vary with different geno-types of LPL-Pvu Ⅱ , especially for change of serum TG ,and P+/P+ group was more sensible.

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THE PRELIMINARY STUDIES ON ANTI-TUMOR ACTIVITY OF GINKGO ALBUMIN AND ITS MECHANISM

Qianchun DENG ; Wen HUANG ; Bijun XIE

Acta Nutrimenta Sinica.1956;0(03):-.

Objective:To study the anti-tumor activity of ginkgo albumin (GA) and its mechanism. Method: Molecular weight of GAⅡa was detected by MS (mass spectrum). The antioxidative effect of GA was studied by deoxyribonucleic acid method and nitroblue tetrazolium (NBT) photo-reduction, and the anti-tumor activity of GA on S180 sarcoma was studied both in vivo and in vitro. Results: Molecular weight of GAⅡa was 29 248u. GA had strong scavenging effect on superoxide radical and hydroxyl radical. The growth of S180 both in vitro and in vivo was inhibited significantly by GA. Conclusion: The anti-tumor activity of GA was probably related with its antioxidative effect.

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INHIBITION OF GASTRIC CANCER CELLS INVASION AND METASTASIS BY GENISTEIN IN VITRO

Junwen ZHANG ; Pilong WANG

Acta Nutrimenta Sinica.1956;0(03):-.

Objetive: To study the effect of genistein on the invasion and metastasis of human gastric cancer cells SGC-7901 in vitro. Method: MTT was used to study the effects of adhesion by genistein on SGC-7901. The Boyden Chamber membrane invasion culture system was used to study invasion and metastasis. Cell-immunochemistry was used to observe the change of TGF- 1. Results: In the membrane invasion culture system, the numbers of invading and migrating SGC-7901 cells were significantly lower in genistein treated groups than those in the control groups (P

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STUDY ON THE EFFECT OF DIFFERENT DIETARY FATTY ACID COMPOSITIONS ON MNU-INDUCED BREAST TUMORS IN RATS

Na WEI ; Mantian MI ; Bin WANG

Acta Nutrimenta Sinica.1956;0(03):-.

Objective: To study the effect of different dietary fatty acid compositions on breast tumors induced by methyl-nitrosourea(MNU) in rats. Method: Female SD rats were fed diets containing 15% fat (wt/wt) in the experimental period. At age of 50d, rats were randomly assigned to 8 groups and each group was suldivided into tumor group and control group. The tumor group was given a single ip injection of MNU (50 mg/kg bw) and switched to one of 8 different diets containing following fatty acids: saturated fatty acid(SFA); monounsaturated fatty acid(MUFA); n-6 polyunsaturated fatty acid(PUFA); n-3 PUFA; 1∶1 n-6/n-3; 5∶1 n-6/n-3; 10∶1 n-6/n-3; 1∶2∶1 S/M/P(n-6/n-3 at 1∶1) for 18w. The control groups received the physiological saline only. The weight growth, mammary tumor incidence, tumor multiplicity, and tumor latency were observed. Results: Except the weight growth was arrested in rats fed on n-3 PUFA 6w later, there was no significant difference in weight growth among the other groups. Additionally, there was no mammary tumor occurrence in control groups, but in model groups, the incidence of mammary tumors in rats fed on SFA, MUFA, n-6 PUFA,5∶1 n-6/n-3, 10∶1 n-6/n-3 and 1∶2∶1 S/M/P diets was twice higher than that in rats fed on 1∶1 n-6/n-3 diet, although there was also no tumorin rats fed on n-3 PUFA diet. Moreover, tumor multiplicity in rats fed on 1∶1 n-6/n-3 diet was obviously decreased in comparison with those groups, and tumor latency was prolonged too. Conclusion: The different dietary fatty acid compositions can diversely influence MNU-induced breast tumors incidence in rats and 1∶1 n-6/n-3 has obvious inhibitory effect.

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THE PREVENTIVE EFFECT OF LYCOPENE ON HYPERGLYCEMIA IN ALLOXAN-INDUCED DIABETIC RATS AND ITS MECHANISM

Yue HUANG ; Xinnan SHEN ; Yanni LIU ; Guoying YAO

Acta Nutrimenta Sinica.1956;0(03):-.

Objective: To study the preventive effect of lycopene (LP) on hyperglycemia in alloxan-induced diabetic rats, and reveal its possible mechanism.Method:Forty Sprague-Dawley rats were randomized into 5 groups:three groups of LP at doses of 5, 20, 50 mg(/kg bw ?d)for 15d, one control group and one model group of salad oil. Then alloxan (ALx) were injected intraperitoneally to the rats at dose of 150 mg/kg bw. At D4 and D14 after ALx injection, an oral glucose tolerance test (OGTT) was performed and body weight was measured, and at D14 GSP, FINS, NEFA, SOD,GSH-Px and MDA in liver were also determined . Results:Compared with the indices in group with ALX injection only,both the 2h blood glucose and GSP in group with medium-dose LP decreased significantly(P

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GREEN TEA CONSUMPTION PREVENTS HYPERCHOLESTEROLEMIA AND OBESITY: A CROSS SECTION STUDY

Yuebin YUAN ; Yuan TIAN ; Wenchao XIAO ; Shunzhang YU

Acta Nutrimenta Sinica.1956;0(03):-.

Objective:To study the preventive effect of drinking green tea on serum lipids and obesity of middle aged people. Method:Total of 3 317 middle-aged people were ascertained by a questionnaire, and their serum lipids were measured at their health examination. Results:Consumption of green tea significantly decreased serum total cholesterol (P

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EFFECTS OF SELENIUM ON GENE EXPRESSION OF PHOSPHOLIPASE D GENE IN LIVER IN DIABETIC RATS

Yuntang WU ; Zhong SUN ; Xia WANG ; Xiaoyong LIU ; Zhuangzhi ZHOU ; Yongming WANG

Acta Nutrimenta Sinica.1956;0(03):-.

Objective: To study the regulation of selenium on gene expression of phospholipase D (PLD) gene in relation to liver metabolism of diabetic (DM) rats. Method: Differential display cDNA fragments were isolated from former research project in diabetic rats which were supplemented orally with 50 g/kg bw d selenium for 60d, and were cloned, sequenced, and the homology was analyzed. RT-PCR was made using the primers designed according to the sequences of cDNA fragments. Results: In differential display cDNA fragment, Se-4 and PLD were homologous with sequence identities of 100%.The expression levels of PLD mRNA in DM group and DM+Se group was higher obviously than that of NC group(P

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EFFECTS OF DIFFERENT SELENIUM SOURCES ON THE FUNCTION OF HUMORAL IMMUNITY AND ANTIOXIDANT CAPACITY OF RABBITS IN VIVO

Hua ZHANG ; Kehe HUANG ; Jiabin XUE ; Xingxiang CHEN ; Weizhong XU ; Fu CHEN

Acta Nutrimenta Sinica.1956;0(03):-.

Objective: To explore the effect of different selenium sources on the function of humoral immunity and antioxidant capacity of rabbits. Method: Thirty-five rabbits were randomly divided into seven groups and vaccinated with rabbit haemorrhagic disease (RHD) dead vaccine. At the same time, rabbits were injected respectively with sodium selenite (0.1 mg/kg bw and 0.3 mg/kg bw), Kappa-selenocanageenan (0.1 mg/kgbw and 0.3 mg/kg bw), DL-selenomethionine (0.1 mg/kg bw and 0.3 mg/kg bw) and physiological saline as control. Antibody against RHD, activity of GSH-Px and content of MDA in rabbit serum were detected on 0, 10, 20, 30d after inoculation. Results: Sodium selenite (0.1 mg/kg bw), Kappa- selenocanageenan (0.3 mg/kg), and DL-selenomethionine (0.3mg/kg bw) could significantly increase the level of RHD antibody. Sodium selenite (0.3 mg/kg bw) and Kappa-selenocanageenan (0.3mg/kg bw) improved the activity of GSH-Px. All selenium groups could decrease serum MDA, but Kappa-selenocanageenan (0.3 mg/kg bw) showed the best effect. Conclusion: Kappa-selenocanageenan (0.3 mg/kg bw) was better than the lower dosage and other selenium sources in the effects on the function in humoral immunity and antioxidant capacity of rabbits.

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