In order to assess the meat quality under different storage time and conditions, the pH value, TBA value, glycogen and lactic acid content in muscle of Landrace and Yorkshire were measured. The results showed that wit...In order to assess the meat quality under different storage time and conditions, the pH value, TBA value, glycogen and lactic acid content in muscle of Landrace and Yorkshire were measured. The results showed that within 10 h post slaughtering, post slaughtering time had extremely significant influence on pH value and lactic acid content of Landrace, but had no significant influence on glycogen content and TBA value. On the other hand, post slaughtering time had extremely significant influence on pH value of Yorkshire, but had no significant influence on glycogen, lactic acid content and TBA value. The pH values of Yorkshire at 3, 5 and 10 h post slaughtering were 5.21% （ P 〈 0.01 ）, 5.64% （ P 〈 0.05 ） and 5.59% （ P 〈 0.05 ） higher than those of Landrace, respectively ; the lactic acid content in muscle of Landrace at 10 h post slaughtering was 56.04% （P 〈0.05） higher than that of Yorkshire; the TBA value in muscle of Yorkshire at 10 h post slaughtering was 89. 19% （P 〈 0.01 ） higher than that of Landrace; there was no significant difference in glycogen content between Yorkshire and Landrace. When pork stored at 4℃, storage time had no significant influence on pH value and glycogen content in muscle of Landrace, but had significant influence on drip loss, lactic acid content and TBA value ; storage time had no significant influence on pH value, glycogen content and TBA value in muscle of Yorkshire, but extremely significant influence on drip loss and significant influence on lactic acid content. The pH value in muscle of Yorkshire at 24 h post storage at 4℃ was 6.56% （P 〈0.05） higher than that of Landrace; the glycogen contents in muscle of Landrace at 24, 48, 72, 96, 120 and 144 h post storage at 4℃ were 84.90% （P〈0.05）,78.40% （P〈0.01）, 101.87% （P〈0.05）, 83.80% （P〈0.05）, 83.59% （P〈 0.05）and67.25% （P〈0.01）higher than those of York-shire, respectively; the drip loss of Landrace at 72 h post storage and TBA value at 144 h post storage were 55.70% （ P 〈 0.05 ） and 141.33 % （ P 〈 0.01 ） higher than those of Yorkshire, respectively; there was no significant difference in glycogen content between Yorkshire and Landrace. When pork stored at -20℃, storage time had significant influence on TBA value in muscle of Landrace, but had no significant influence on pH value, thawing water loss rate, glycogen and lactic acid content; storage time had no significant impact on pH value, thawing water loss rate, glycogen content and TBA value in muscle of Yorkshire, and had significant influence on lactic acid content. The pH value in muscle of Yorkshire at 24 h post storage at - 20℃ was 5.43 % （ P 〈 0.05 ） higher than that of I.andrace ; the glycogen contents in muscle of Landrace at 24, 48, 72, 96, 120 h post storage at - 20℃ were 85.08% （ P 〈0. 05 ）, 108.66% （ P 〈 0.01 ）, 72.69% （ P 〈 0.05 ）, 90.31% （ P 〈 0.01 ）, 70.38% （ P 〉 0.05 ） higher than those of Yorkshire, respectively ; the thawing water loss rates of Landrace at 24 and 72 h were 160.14% （ P 〈 0.05 ） and 74.32% （ P 〈 0.05 ） higher than those of Yorkshire, respectively ; there was no significant difference in lactic acid content and TBA value at the same time point between Yorkshire and Landrace.展开更多
Human albumin(HA)is a very important blood product which requires strict quality controlstrategy.Acid precipitation is a key step which has a great effect on the quality of final product.Therefore,a new method based o...Human albumin(HA)is a very important blood product which requires strict quality controlstrategy.Acid precipitation is a key step which has a great effect on the quality of final product.Therefore,a new method based on quality by design(QbD)was proposed to investigate thefeasibility of realizing online quality control with the help of near infrared spectroscopy(NIRS)and chemometrics.The pH value is the critical process parameter(CPP)in acid precipitationprocess,which is used as the end-point indicator.Six batches,a total of 74 samples of acidprecipitation process,were simulated in our lab.Four batches were selected randomly as cali-bration set and remaining two batches as validation set.Then,the analysis based on materialinformation and three dfferent variable selection methods,including interval partial least squaresregression(iPLS),competitive adaptive reweighted sampling(CARS)and correlation coeficient(CC)were compared for eliminating irrelevant variables,Fimally,iPLS was used for variablesselection.The quantitative model was built up by partial least squares regression(PLSR).Thevalues of determination coeficients(R^(2)_(C) and R^(2)_(P)),root mean squares error of prediction(RMSEP),root mean squares error of calibration(RMSEC)and root mean squared error of crossvalidation(RMSECV)were 0.969,0.953,0.0496,0.0695 and 0.0826,respectively.The paired t test and repeatability test showed that the model had good prediction ability and stability.The results indicated that PLSR model could give accurate measurement of the pH value.展开更多
A series of extraction equilibrium experiments for aminobenzoic acid with di(2-ethylhexyl)phosphoric acid (D2EHPA) dissolved in n-octane or 1-octanol was carried out. The effects of aminobenzoic acid concentration,D2E...A series of extraction equilibrium experiments for aminobenzoic acid with di(2-ethylhexyl)phosphoric acid (D2EHPA) dissolved in n-octane or 1-octanol was carried out. The effects of aminobenzoic acid concentration,D2EHPA concentration and pH on the distribution ratio were discussed in detail. The infrared spectra of the organic phase loaded with solute illustrated that pH had little effect on the structure of the complex formed. There proceed ion association and cation-exchange.reaction in the extraction. An expression of the equilibrium distribution was proposed.展开更多
目的研究联合应用Apgar评分、脐动脉血pH值与乳酸诊断新生儿窒息的效果.方法选取2020年4月至2022年3月广州市番禺区妇幼保健院收治的100例新生儿窒息患儿为研究组,同期在本院分娩的200例正常新生儿为对照组,比较2组1 min Apgar评分、脐...目的研究联合应用Apgar评分、脐动脉血pH值与乳酸诊断新生儿窒息的效果.方法选取2020年4月至2022年3月广州市番禺区妇幼保健院收治的100例新生儿窒息患儿为研究组,同期在本院分娩的200例正常新生儿为对照组,比较2组1 min Apgar评分、脐动脉血pH值及乳酸水平,并分析各单项指标及不同指标联合诊断新生儿窒息的准确率、灵敏度和特异度.结果研究组1 min Apgar评分、脐动脉血pH值和乳酸水平均高于对照组(均P<0.001).各单项指标中,1 min Apgar评分诊断准确率高于脐动脉血pH值和乳酸(均P<0.01)、灵敏度高于脐动脉血pH值(P<0.05)、特异度高于乳酸(P<0.01);联合指标中,1 min Apgar评分+脐动脉血pH值诊断准确率、灵敏度和特异度分别为80.67%、81.00%和80.50%,1 min Apgar评分+乳酸诊断准确率、灵敏度和特异度分别为80.00%、84.00%和78.00%,1 min Apgar评分+脐动脉血pH值+乳酸诊断准确率、灵敏度和特异度分别为95.00%、100.00%和92.50%,1 min Apgar评分+脐动脉血pH值+乳酸的诊断准确率、灵敏度和特异度高于1 min Apgar评分+脐动脉血pH值和1 min Apgar评分+乳酸(均P<0.001).结论在应用1 min Apgar评分与脐动脉血pH值的基础上联合乳酸检测能够提高新生儿窒息的诊断效果.展开更多
测定了 10种国产白肋烟和 8种进口白肋烟的非挥发性有机酸、高级脂肪酸、生物碱含量及水溶液的 p H值。结果表明 ,国产白肋烟中非挥发性有机酸、高级脂肪酸和生物碱的含量明显高于进口白肋烟。但国产白肋烟的 p H值显著低于国外样品。...测定了 10种国产白肋烟和 8种进口白肋烟的非挥发性有机酸、高级脂肪酸、生物碱含量及水溶液的 p H值。结果表明 ,国产白肋烟中非挥发性有机酸、高级脂肪酸和生物碱的含量明显高于进口白肋烟。但国产白肋烟的 p H值显著低于国外样品。对国产白肋烟的加料处理技术 。展开更多
基金Supported by Shandong Swine Industry Technology System Innovation(SDAIT-08-03)Agricultural Improved Variety Project of Shandong Province(2011LZ013-01)National Swine Industry Technology System Innovation(CARS-36-09B)
文摘In order to assess the meat quality under different storage time and conditions, the pH value, TBA value, glycogen and lactic acid content in muscle of Landrace and Yorkshire were measured. The results showed that within 10 h post slaughtering, post slaughtering time had extremely significant influence on pH value and lactic acid content of Landrace, but had no significant influence on glycogen content and TBA value. On the other hand, post slaughtering time had extremely significant influence on pH value of Yorkshire, but had no significant influence on glycogen, lactic acid content and TBA value. The pH values of Yorkshire at 3, 5 and 10 h post slaughtering were 5.21% （ P 〈 0.01 ）, 5.64% （ P 〈 0.05 ） and 5.59% （ P 〈 0.05 ） higher than those of Landrace, respectively ; the lactic acid content in muscle of Landrace at 10 h post slaughtering was 56.04% （P 〈0.05） higher than that of Yorkshire; the TBA value in muscle of Yorkshire at 10 h post slaughtering was 89. 19% （P 〈 0.01 ） higher than that of Landrace; there was no significant difference in glycogen content between Yorkshire and Landrace. When pork stored at 4℃, storage time had no significant influence on pH value and glycogen content in muscle of Landrace, but had significant influence on drip loss, lactic acid content and TBA value ; storage time had no significant influence on pH value, glycogen content and TBA value in muscle of Yorkshire, but extremely significant influence on drip loss and significant influence on lactic acid content. The pH value in muscle of Yorkshire at 24 h post storage at 4℃ was 6.56% （P 〈0.05） higher than that of Landrace; the glycogen contents in muscle of Landrace at 24, 48, 72, 96, 120 and 144 h post storage at 4℃ were 84.90% （P〈0.05）,78.40% （P〈0.01）, 101.87% （P〈0.05）, 83.80% （P〈0.05）, 83.59% （P〈 0.05）and67.25% （P〈0.01）higher than those of York-shire, respectively; the drip loss of Landrace at 72 h post storage and TBA value at 144 h post storage were 55.70% （ P 〈 0.05 ） and 141.33 % （ P 〈 0.01 ） higher than those of Yorkshire, respectively; there was no significant difference in glycogen content between Yorkshire and Landrace. When pork stored at -20℃, storage time had significant influence on TBA value in muscle of Landrace, but had no significant influence on pH value, thawing water loss rate, glycogen and lactic acid content; storage time had no significant impact on pH value, thawing water loss rate, glycogen content and TBA value in muscle of Yorkshire, and had significant influence on lactic acid content. The pH value in muscle of Yorkshire at 24 h post storage at - 20℃ was 5.43 % （ P 〈 0.05 ） higher than that of I.andrace ; the glycogen contents in muscle of Landrace at 24, 48, 72, 96, 120 h post storage at - 20℃ were 85.08% （ P 〈0. 05 ）, 108.66% （ P 〈 0.01 ）, 72.69% （ P 〈 0.05 ）, 90.31% （ P 〈 0.01 ）, 70.38% （ P 〉 0.05 ） higher than those of Yorkshire, respectively ; the thawing water loss rates of Landrace at 24 and 72 h were 160.14% （ P 〈 0.05 ） and 74.32% （ P 〈 0.05 ） higher than those of Yorkshire, respectively ; there was no significant difference in lactic acid content and TBA value at the same time point between Yorkshire and Landrace.
基金support of the Major Special Project of National Science and Technology(No.2014ZX09508003-001-003)the supply of Supernatant FIV of Shandong Taibang Biological Products Limited Company.
文摘Human albumin(HA)is a very important blood product which requires strict quality controlstrategy.Acid precipitation is a key step which has a great effect on the quality of final product.Therefore,a new method based on quality by design(QbD)was proposed to investigate thefeasibility of realizing online quality control with the help of near infrared spectroscopy(NIRS)and chemometrics.The pH value is the critical process parameter(CPP)in acid precipitationprocess,which is used as the end-point indicator.Six batches,a total of 74 samples of acidprecipitation process,were simulated in our lab.Four batches were selected randomly as cali-bration set and remaining two batches as validation set.Then,the analysis based on materialinformation and three dfferent variable selection methods,including interval partial least squaresregression(iPLS),competitive adaptive reweighted sampling(CARS)and correlation coeficient(CC)were compared for eliminating irrelevant variables,Fimally,iPLS was used for variablesselection.The quantitative model was built up by partial least squares regression(PLSR).Thevalues of determination coeficients(R^(2)_(C) and R^(2)_(P)),root mean squares error of prediction(RMSEP),root mean squares error of calibration(RMSEC)and root mean squared error of crossvalidation(RMSECV)were 0.969,0.953,0.0496,0.0695 and 0.0826,respectively.The paired t test and repeatability test showed that the model had good prediction ability and stability.The results indicated that PLSR model could give accurate measurement of the pH value.
文摘A series of extraction equilibrium experiments for aminobenzoic acid with di(2-ethylhexyl)phosphoric acid (D2EHPA) dissolved in n-octane or 1-octanol was carried out. The effects of aminobenzoic acid concentration,D2EHPA concentration and pH on the distribution ratio were discussed in detail. The infrared spectra of the organic phase loaded with solute illustrated that pH had little effect on the structure of the complex formed. There proceed ion association and cation-exchange.reaction in the extraction. An expression of the equilibrium distribution was proposed.
文摘目的研究联合应用Apgar评分、脐动脉血pH值与乳酸诊断新生儿窒息的效果.方法选取2020年4月至2022年3月广州市番禺区妇幼保健院收治的100例新生儿窒息患儿为研究组,同期在本院分娩的200例正常新生儿为对照组,比较2组1 min Apgar评分、脐动脉血pH值及乳酸水平,并分析各单项指标及不同指标联合诊断新生儿窒息的准确率、灵敏度和特异度.结果研究组1 min Apgar评分、脐动脉血pH值和乳酸水平均高于对照组(均P<0.001).各单项指标中,1 min Apgar评分诊断准确率高于脐动脉血pH值和乳酸(均P<0.01)、灵敏度高于脐动脉血pH值(P<0.05)、特异度高于乳酸(P<0.01);联合指标中,1 min Apgar评分+脐动脉血pH值诊断准确率、灵敏度和特异度分别为80.67%、81.00%和80.50%,1 min Apgar评分+乳酸诊断准确率、灵敏度和特异度分别为80.00%、84.00%和78.00%,1 min Apgar评分+脐动脉血pH值+乳酸诊断准确率、灵敏度和特异度分别为95.00%、100.00%和92.50%,1 min Apgar评分+脐动脉血pH值+乳酸的诊断准确率、灵敏度和特异度高于1 min Apgar评分+脐动脉血pH值和1 min Apgar评分+乳酸(均P<0.001).结论在应用1 min Apgar评分与脐动脉血pH值的基础上联合乳酸检测能够提高新生儿窒息的诊断效果.
