响应面法优化紫山药色素提取工艺

以紫山药为原料,采用溶剂提取法提取紫山药色素。结果表明,紫山药色素的最大吸收波长为540 nm,与丙酮和甲醇相比,体积分数为40%的乙醇对色素的提取率最高。以吸光值为指标,通过单因素试验分别考察了液料比、温度和提取时间等三个因素对紫山药色素提取率的影响,在此基础上采用响应面试验设计对乙醇提取色素的工艺参数进行优化,确定最佳工艺条件为:液料比92(m L/g)、温度58℃、提取时间128 min。     

响应面法优化产右旋糖酐肠膜明串珠菌的发酵培养基

为提高右旋糖酐的产率,对肠膜明串珠菌CICC-21725发酵培养基进行优化。在单因素试验的基础上,根据中心设计原理,采用响应面法确定培养基成分间交互作用及最优组成。结果表明:优化后各培养基成分为蔗糖80.0 g/L,蛋白质7.0 g/L,磷酸氢二钠1.5 g/L,磷酸二氢钾0.3 g/L,在p H7.1、25℃、150 r/min时发酵21 h,右旋糖酐产率可达92.79%,与单因素优化后的右旋糖酐产率相比,提高了7.2%。红外光谱及核磁共振分析表明,发酵产物为右旋糖酐。     

响应面法优化紫兰草紫色素提取工艺及其稳定性研究

为优化紫兰草紫色素提取工艺并对其稳定性进行研究,在单因素试验基础之上,以提取温度、料液比和提取时间为影响因素,蒸馏水为提取剂,吸光度值为响应值,利用Box-Behnken中心组合法进行三因素三水平响应面分析试验;同时,研究pH、光照、蔗糖、NaCl、金属离子、氧化剂和还原剂等因素对紫色素稳定性的影响。结果表明:经响应面法优化得到最佳提取工艺条件为提取温度38℃、料液比1∶24g/mL、提取时间60min,该工艺条件所得响应值与理论值相对误差为0.28;同时,此条件下提取的紫色素具耐酸性,易受光照影响,耐受蔗糖能力较强,NaCl具增色作用,除了Cu^2+以外,对大部分金属离子较稳定;在氧化剂中稳定性较好。本研究用响应面法优化了紫兰草紫色素的提取工艺,并验证出所提取的紫色素具有良好的稳定性。     

响应面法优化啤酒有害菌检测培养基

为了提高啤酒有害菌的检出率和检测的灵敏性,采用Plackett-Burman设计法和响应面分析法(Response Surface Analysis)对CNFF-A培养基组分和配比进行优化。先用Plackett-Burman设计从7个因子中筛选出对菌落数有显著影响的因素,再用最陡爬坡试验及Box-Behnken设计进一步优化。结果表明,蜂蜜、叶酸和乙酸钠是影响菌落数的显著因素,优化后的培养基配方为:蜂蜜0.1g/L、牛肉浸粉7.0g/L、酵母浸出物5.0g/L、精氨酸1.0g/L、叶酸2.0g/L和乙酸钠1.5g/L。此条件下,培养基对啤酒有害菌的检出率大大提高,且检测时间缩短了24h。     

利用响应面法优化GSH发酵培养基

利用Plackett-Burman试验设计,筛选出影响GSH产量的3个重要因素,分别为葡萄糖、蛋白胨、KH2PO4.在此基础上,再利用Box-Behnken试验设计及借助于MINTAB软件进行二次回归分析,确定了主要影响因素的最佳浓度,葡萄糖、蛋白胨、KH2PO4最佳发酵质量浓度分别为2.75%、3.03%、0.11%.在优化的培养基中,GSH产量达到147.02mg/L,比优化前的98.94mg/L提高48.60%.     

响应面法优化紫甘薯酒中花色苷含量

以紫甘薯酒为研究对象,在单因素实验的基础上,应用Box-Behnken方法进行三因素三水平实验,以液料比、发酵初始p H和发酵温度为影响因素,花色苷含量为响应值,进行响应面分析。确定最佳发酵工艺条件为液料比1.4∶1,p H4.15,发酵温度24℃。在此条件下发酵,可得酒度为12.3°,花色苷含量为123.34mg/L的紫甘薯酒,花色苷含量与其理论值124.54mg/L接近,相对误差小于0.96%。结果表明,采用响应面分析法对紫甘薯酒中的花色苷含量进行优化合理可行,可为进一步研究提供依据。      

紫甘薯淀粉产红曲色素的液态发酵培养基优化

本实验以紫甘薯为原料,采用液体深层发酵技术,应用响应面法优化了红曲霉液态发酵培养基。结果表明,以紫甘薯淀粉为碳源时,红曲霉发酵产红曲色素的二次多项数学模型具有显著性(p=0.0103),决定系数为0.947。由模型解逆矩阵得到:在紫甘薯淀粉、蛋白胨和L-谷氨酸钠浓度分别为12.63%、1.14%和0.35%时,红曲色素产量可达177.009U/ml。     

响应面法优化假单胞菌产胞外多糖发酵培养基

采用响应面法对假单胞菌（Pseudomonas sp.）FJY5-13生产胞外多糖的发酵培养基进行优化。通过Plackett-Burman试验、最陡爬坡试验及Box-Behnken试验构建回归方程,结果表明,最佳发酵培养基成分为甘油83.0 g/L、酵母浸粉5.7 g/L、NaCl 8.2 g/L、柠檬酸钠5 g/L、（NH4）2SO4 1 g/L、玉米浆粉7.5 g/L,在此条件下,胞外多糖的产量为10.50 g/L,约为优化前多糖产量7.9 g/L的1.3倍。     

桑黄液体发酵培养基的响应面法优化研究

为提高桑黄菌丝产量,利用SAS软件对桑黄菌液体发酵培养基进行优化研究。运用Plackett-Bunnan设计法筛选出影响桑黄粗多糖产量的主要因素,在此基础之上采用中心组合设计及响应面分析确定主要影响因子最佳浓度。通过试验发现,当玉米粉4.1%、麸皮2.8%,KH2PO40.32%时,桑黄胞外粗多糖产量达到最大值6.45g/L,较优化前的5.14g/L提高了25.4%。     

响应面法优化粘质沙雷氏菌产灵菌红素发酵工艺

为提高粘质沙雷氏菌(Serratia marcescens)PG12的灵菌红素产量,以K₂HPO₄浓度、溶氧量和发酵时间为考察因素,以灵菌红素产量为评价指标,对灵菌红素发酵工艺条件进行研究。在单因素试验基础上,通过响应面法对发酵工艺条件进行优化。结果表明,菌株产灵菌红素的最佳的发酵工艺条件为K₂HPO₄浓度28.45 mmol/L,溶氧量47%,发酵时间29 h。在最佳条件下,灵菌红素产量达到1 636.5 mg/L,较原始条件下的灵菌红素产量提高了13.14%。该研究可为灵菌红素发酵工艺条件的优化及生产实践提供有价值的参考。     

Optimizing conditions for anthocyanins extraction from purple sweet potato using response surface methodology (RSM)

Optimization for purple sweet potato (Ipomoea batatas (L.) Lam) anthocyanins (PSPAs) extraction was investigated using response surface methodology in this paper. PSPAs were extracted using acid-ethanol at different extraction temperature (40-80 °C), time (60-120 min) and solid-liquid ratio (1:15-1:30). The combined effects of extraction conditions on PSPAs yield and color attributes (expressed as L*, C* and H) were studied using a three-level three-factor Box-Behnken design. The results showed that The highest yield (158 mg/100 g dw) of PSPAs were reached at the temperature 80 °C, extraction time 60 min, and solid-liquid ratio 1:32. PSPAs yield indicated a high and significant correlation with L^* (P<0.05; r=−0.961) and it was significantly affected by extraction temperature (P<0.01) and solid-liquid ratio (P<0.05).     

响应面法优化螺旋藻自溶条件的研究

以新鲜螺旋藻藻泥为原料,通过响应面实验设计方法对螺旋藻自溶条件进行优化。以可溶性肽含量为响应变量,温度、pH以及Na+浓度为自变量,应用中心复合设计-一致精度(CCD Uniform precision)法设计实验,轴值取1.43,6个中心点,共20组实验。实验结果表明,螺旋藻自溶最适温度为48.6℃、pH为9.6以及Na+浓度为1.00mol/L,最适条件下螺旋藻自溶1hTCA-可溶性肽含量比未优化(室温25℃,加蒸馏水)下高6.35倍。     

响应面法优化酸性蛋白酶发酵条件的研究

采用响应面方法对黑曲霉（Aspergillus niger357）产酸性蛋白酶的发酵条件进行了优化。首先通过全因子实验分析了温度、pH值、接种量、装液量对产酶的影响,确定主要影响因子为温度、装液量,前者为正影响,后者为负影响。用最陡爬坡实验逼近最大响应区域,利用中心组合设计及响应面分析确定主要影响因子的最佳水平。在优化的发酵条件下发酵3d,酶活达到1543、01U／mL。     

响应面法优化普鲁兰酶发酵条件

采用响应面法对一株普鲁兰酶产生菌的产酶条件进行优化。首先,结合单因素实验,通过Plackett-Burmen试验设计,以P0.05为准,筛选出玉米淀粉、玉米浆、初始p H对普鲁兰酶产量有显著影响。根据响应面分析得到普鲁兰酶酶活最佳工艺参数为:玉米淀粉浓度3.49%,玉米浆浓度2.48%,初始p H为6.7。最后,优化后的培养基成分如下:玉米淀粉浓度3.49%,葡萄糖0.4%,玉米浆浓度2.48%,Fe SO40.1%,K2HPO4 0.1%,Mg SO4·7H2O 0.1%,初始p H为6.7,培养温度37℃,初始接种量为6%,酶活达到11.633U/m L。     

Optimisation of conditions for glucose syrup production from banana (Musa paradisiaca L.) pulp using response surface methodology

A central composite design was applied to assess some basic factors that affect profoundly the production of dextrose equivalent from banana pulp. Optimal conditions for the conversion of starch banana pulp to glucose were found to be a banana pulp concentration of 8.5%, reaction time of 90 min, and α‐amylase concentration of 0.04% for liquefaction and reaction time of 24 h with a glucoamylase concentration of 0.05% for saccharification. Only 16 and 12 experiments, respectively, were needed to assess these conditions. The adequacy of model was highly satisfactory, because the coefficients of determination (R²) were 0.93 and 0.91, respectively. The glucose syrup (GS) obtained was slightly yellowish with a hint of brown and slightly sweet. The syrup had a protein of 0.63% and an ash content of 0.60%, with a pH of 4.8. The characteristics of the GS produced met all the recommended standards, except for that of colour.     

响应面法优化虫草培养的研究

利用响应面分析法,研究蔗糖、牛肉膏和pH值对虫草菌生长生物量的影响。结果表明:营养源的种类和浓度对虫草菌生物量有很大的影响,在所选用的蔗糖、葡萄糖、柠檬酸铵、淀粉和牛肉膏、蛋白胨、硫酸铵七种营养源中,蔗糖和牛肉膏最利于虫草菌的生长,浓度以2%左右为宜;当蔗糖的浓度为2.74%、牛肉膏浓度为1.86%、pH值为7.37时,虫草菌C.FFCC5124的生物量为10.2g/L。响应面试验的方差分析表明:一次项对响应值的影响很显著,其次为平方项,而交互项影响较为微弱。     

Optimizing conditions for methylmercury extraction from fish samples for GC analysis using response surface methodology

Response surface methodology (RSM) was used to determine the optimum experimental conditions to extract methylmercury from fish samples for GC analysis. The influence of four variables – acid concentration (3–12 M), cysteine concentration (0.5–2% w/v), solvent volume (3–9 ml) and extraction time (10–30 min) – on recovery of methylmercury was evaluated. The detection limit for methylmercury analysis using a microelectron capture detector was 7 ng g^?1 in fish samples. The mean recovery under optimum conditions was 94%. Experimental data were adequately fitted into a second-order polynomial model with multiple regression coefficients (r ²) of 0.977. The four variables had a significant effect (p < 0.05) on the recovery of methylmercury from a reference material (BCR-463). Optimum conditions for methylmercury extraction were found using an acid concentration of 12.2 M, cysteine concentration of 2.4%, solvent volume of 1.5 ml and extraction time of 35 min. The validation of the developed method to analyze methylmercury in fish samples exhibited good agreement with mercury content in the samples.     

Optimizing extraction conditions for functional compounds from ginger (Zingiber officinale Roscoe) using response surface methodology

Food Science and Biotechnology - Extraction process was optimized for maximizing the contents of functional compounds from ginger using response surface methodology which applied Box–Behnken...     

玉米黑粉菌培养条件响应面法优化研究

采用Plackett—Burman设计（Plackett—BurmanDesign，P-B）对影响玉米黑粉菌（Ustilago maydis）AS 5．128发酵胞外多糖的内在和外在因素进行了筛选，所选取的6个相关因素为：初始pH、培养温度、发酵时间、装液量、接种量、摇床转速。在此基础上，采用响应曲面法（Response Surface Methodology，RSM）对影响玉米黑粉菌发酵胞外多糖的关键影响因素培养温度、发酵时间和接种量的最佳水平范围作了进一步的研究，通过对二次多项回归方程求解得知，培养温度26．37℃、发酵时间7．03d和接种量9．49％时，胞外多糖产量的最大预测值为1650．92μg／mL。     

响应面法优化松仁蛋白酶解工艺条件

在pH、酶与底物比、温度和酶解时间4个单因素实验的基础上,利用响应面分析法对松仁蛋白最佳酶解条件进行了研究。结果表明,Alcalase2.4L碱性蛋白酶水解松仁蛋白的最佳水解条件为pH8.0,水解温度53℃,酶与底物比8800U/g蛋白,底物浓度1.2%,水解时间50min。