CEpH—少氯漂白的有效尝试

对KP苇浆和NaOH－AQ麦草浆进行了CEPH少氯漂白试验，对漂液中的氯化物含量进行了检测。结果表明，此法效果显著，极其工业推广价值     

枸杞提取物脱色工艺研究

采用过氧化氢氧化色素脱色对枸杞提取物进行脱色。结果表明:100mg枸杞提取物在温度为90℃、pH值为9和过氧化氢添加量为6.00mL条件下,脱色时间为15min,多糖保留率为59.16%。     

水成沉积物释光测年研究进展与展望

石英光释光(OSL)测年方法对于蕴藏着丰富区域气候环境变迁、古洪水、古地震及构造信息的冲积、洪积、湖积等水成沉积物组成的沉积地层,面临许多难题.水成沉积物矿物颗粒在搬运和沉积过程中,先前积存的释光信号能否被晒退,晒退是否均匀?残留水平如何?如何准确测定这些沉积物的天然释光信号强度的等效剂量(De)?环境剂量率怎样才能准确测定等问题,是几十年来国内外释光测年研究者普遍关注的问题.本文通过对水成沉积物研究成果的梳理、存在问题及研究现状分析,探讨了光释光测年方法在水成沉积物方面的应用前景.     

65家面粉生产企业呼吁严禁面粉滥用增白剂

针对目前粮食滥用面粉增白剂的现象,北京市粮食集团公司等65家生产企业10月下旬共同呼吁,禁止滥用面粉增白剂,确保人们吃上放心的面粉。     

二氧化氯稳定溶液在棉织品漂白中的应用

与次氯酸钠和双氧水相比，二氧化氯不仅能有效降解织物中的杂质，而且不会降低织物强力，也不会造成水体的严重污染，是一种值得研究和推广的短流程纯棉织物前处理方法。文章简要说明了实验室制备二氧化氯稳定性溶液的方法，并通过正交试验法研究了二氧化氯漂白法的影响参数。     

百合膳食纤维的漂白工艺研究

对百合膳食纤维的漂白工艺进行了研究。研究显示 :两种膳食纤维具有相同的主次关系 ,即H2 O2 用量 >pH >漂白时间 >温度。H2 O2 的用量有极为显著影响 ,pH的影响次之。     

Phthalocyanine metal complexes: Versatile catalysts for selective oxidation and bleaching

Iron and other metal phthalocyanine complexes can mediate both selective oxidation and bleaching reactions depending on the choice of oxidant. Olefins, phenols, condensed aromatics can efficiently be oxidized to valuable products by ^tBuOOH. The use of H₂O₂ leads to a different kind of reactivity providing efficient systems for catalytic degradation of recalcitrant pollutants and bleaching. The discovery of remarkable catalytic properties of μ-nitrido diiron phthalocyanine complexes exemplified by mild catalytic oxidation of methane in water at near-ambient conditions is of especial significance. This emerging type of oxidation catalysts has a great potential for the development. In this context, a combinatorial approach might be particularly fruitful. First, different macrocyclic ligands can be used, e.g. phthalocyanines, porphyrins, porphyrazines, corroles, corrolazines, etc. to produce either symmetrical dimers with the same ligand or unsymmetrical dimers having two different macrocyclic ligands. Secondly, a number of transition metals (Fe, Mn, Ru, Cr, V, Ti, etc.) can be used for the preparation of homoleptic or heteroleptic dimers having the same or different metals. Finally, several single bridging atoms can be used including O, N, C. The great variability of possible metal, ligand, bridging atom combinations might provide a large variety of complexes with different and tunable catalytic properties.     

造纸工业中的低污染漂白技术的发展

造纸工业是环境污染的重要来源之一，本文对我国传统的纸浆漂白工艺进行分析，并简述了国内外新型的低污染漂白技术，同时提出了发展低污染漂白技术的对策。     

Benefits and limitations of a novel chlorophyll adsorbent

Silica hydrogels acidified with strong mineral acids, such as sulfuric acid, are highly effective chlorophyll and phospholipid adsorbents relative to traditional acid-activated bleaching earth (ABE), but they are not effective β-carotene adsorbents. When an acidified silica is used as the only bleaching agent, sulfuric acid leaches into the oil, and after deodorization, Tintometer red and yellow (R/Y) numbers are higher than those for ABE-bleached and deodorized oils. The fixed R/Y colors do not arise solely from the decomposition of β-carotene during deodorization. Sequential treatments of canola oils with sulfuric acid/silica and ABE can be performed to overcome all of the drawbacks associated with sulfuric acid/silica treatment alone, such that finished oils can be produced by lower overall adsorbent dosages.     

Separation and characterization of pigments from bleached and deodorized canola oil

An analysis of pigments responsible for color formation during bleaching and deodorization of canola oils treated with activated bleaching earth (ABE) or novel mineral-acid/silica (AS) adsorbents is presented. The chromophores are trace glycerides and were concentrated by silica column chromatography. The concentrated color bodies were hydrolyzed and analyzed as free acids or methyl esters by reversed-phase high-performance liquid chromatography with photodiode array and mass spectrometry detection,¹H and¹³C nuclear magnetic resonance and infrared spectroscopies. Absorbance in deodorized oils is mostly from oxygenated C18 and C20 fatty acids with 1 to 4 double bonds. High-wavelength absorbance in AS-bleached oils is from conjugated pentane fatty acids that are not observed for ABE-bleached oils. Thus, both the bleaching agent and the deodorization treatment affect the distribution and concentration of such stable chromophores.