Measures to avoid color darkening were adopted in all procedures from the treatment of raw materials to product package.

Selection of Aspergillus niger using corn powder as raw material to product citric acid

利用玉米粉产柠檬酸黑曲霉的筛选

Selection of raw materials, product formulation, manufacturing technology and technical indexes were presented.

对原材料的选用、生产配方、生产工艺、技术指标等作了介绍。

Good Raw Material Good Product

优质的原料优质的产品

The recycled CO_2, which was saturated with ethanol and water vapor, was then passed through the adsorption column with activated carbon as adsorbent. After desorption, raw ethanol product with 50 wt% ethanol could be obtained.

饱和了乙醇和水蒸汽的循环的CO2气通过活性炭吸附柱，解吸后可获得乙醇浓度为50wt%左右的粗乙醇产品。

The Behavior Analysis of Consumer Selecting Raw Farm Product Retail Terminal& Theory Explain Based on Consumer Utility

消费者选择生鲜农产品零售终端的行为分析&基于消费者效用的理论解释

Isobutyl isobutyrate with purity of ≥ 99.5% was obtained by distillation of the raw product, with the conversion of isobutyraldehyde of ≥ 98.5% and the selectivity to isobutyl isobutyrate of ≥ 95% respectively.

脱除催化剂后，粗产品精制得到纯度≥995%的异丁酸异丁酯，异丁醛的转化率≥985%，异丁酸异丁酯的选择性≥95%。

Reaction condition for synthesis of P hydroxymandelic acid through reacting phenol with glyoxylic acid was optimized. The purity of the obtained raw product was well determined by HPLC on common column.

优化了用苯酚与乙醛酸合成对羟基苦杏仁酸的反应条件，并在普通色谱柱上用HPLC法成功地测定了粗产物的纯度。

The raw product from hydrogenation is continuously rectified. 1,4-Butanediol from continuous rectification is subject to PBT polymerization test, and is found to be up to the polymerization grade.

对加氢所得的1,4-丁二醇粗产品进行了连续精馏和PBT聚合试验，表明试验所得的1,4-丁二醇产品达到了聚合级要求。

The raw product is washed, distilled in vacuum and filtrated to produce the end-product with an epoxidized value over 5%.

粗品经水洗、减压蒸馏、压滤可制得环氧值大于5.0%的成品。

Compared with appearance, analysis of major composition by GC and quality of raw product and purified biodiesel, the quality of purified biodiesel is better than raw biodiesel.

对得到的生物柴油产品，通过外观、主要成份的气相色谱分析以及性能指标的检测，表明分离后的产品纯度较高。

Result The content of polysaccharide was 80.6% after the raw product of girald acanthopanax was separated and refined.

结果红毛五加粗品多糖经分离精制后其多糖含量为80.6%。

The purity of raw product is 96%. and it is up to 98.5% by recrystallization.

反应收率为93%左右，粗品含量96%左右，通过重结晶，含量可达98.5%以上。

To drive the reaction to completion, it may be desirable to continuously separate the raw product phase.

为了驱使反应完全，希望继续分离粗产物相。

Raw product was analyzed by GC and IR for purity analysis and structure characterization.

用色谱仪和红外仪对产品进行纯度分析和结构表征。

The more modern face of China reasserts itself a few hours later in the district of Kundu.

几小时之后我们见到了更多标榜着自己的中国面孔，地点是昆都区（Kundu）。

Yet the bigger threat to its ambitions to reassert regional influence lies in its own attitude towards the neighbours.

然而，俄国雄心勃勃的想重振其区域影响力，其威胁在于它对领国的态度。

As America reasserts its role as a Pacific power, many in the region are asking whether we are there to stay.

在美国重申其作为太平洋强国的地位之际，该地区很多人在问，我们是否会继续留在那里。

Recently, factionalism has been reasserting itself; this is something to which we must certainly pay attention.

最近这个时期，又钻出了一个派性，这一点我们一定要注意。

Since the1970s, the city has reasserted its Catalon background.

二十世纪七十年代以来，这个城市重新宣告了它的加泰罗背景。

We have a tough and dominant boss who will reassert himself as soon as he gets back.

我们有一个粗暴专横的老板，他一回来就会重新发号施令。