壳聚糖制备新工艺及生产废水处理

研究一种制备壳聚糖的新方法——“一步法”，即将虾、蟹壳酸浸、碱煮、脱乙酰后直接制得壳聚糖，分析了操作中各步骤的溶液组成、处理温度和处理时间等因索对壳聚糖脱乙酰度和粘均分子量的影响，并通过正交实验对工艺参数进行了优化。采用自然沉淀、两次中和及活性污泥法组合处理壳聚糖生产废水，不仅能使处理后的废水达标排放，而且可完全回用，实现零排放。废水处理过程中产生的废渣水洗后经压滤，可作饲科。     

三维荧光光谱法连续测定苯胺、二苯胺和N-甲基苯胺

本文比较了苯胺、二苯胺、N-甲基苯胺的二维荧光光谱和三维荧光光谱。提出了同时测定苯胺,二苯胺和N甲基苯胺的分析方法,它们的浓度分别在2.0×10~(-7)～5.0×10~(-6)mol/L,9.0×10~(-8)～7.4×10~(-6)mol/L,1.3×10~(-7)～2.0×10~(-8)mol/L范围内有良好的线性关系,检出限为1.0×10~(-7)mol/L,8.0×10~(-9)mol/L,1.0×10~(-7)mol/L.相对标准偏差分别为5％,7％,7％.此方法用于混合样品和工业废水的分析,获得较满意的结果.     

Synthesis of Novel 1-Arylsulfonyl-4-（1＇-N-2＇, 3＇, 4＇, 6＇-tetra-O-acetyl-β-D-glucopyranosyl）thiosemicarbazides

The synthesis of novel 1-arylsulfonyl -4- （1＇-N -2＇, 3＇, 4＇, 6＇-tetra-O-acetyl-β-D-gluco- pyranosyl） thiosemicarbazides via condensation of 2, 3, 4, 6-tetra-O-acetyl-β-D-glucopyranosyl isothiocyanate with substituted phenylsulfonyl hydrazines was described. Their structures and physical properties were confirmed by ^1H NMR, ^13C NMR spectra, elemental analysis and MS.     

CHARACTERIZATION OF NOVEL POLYMERIC INTERMEDIATE POLY（p-BROMOACETYL STYRENE） CROSSLINKED BY DIVINYLBEZENE

Acetyl crosslinked polystyrene (EPS) and crosslinked bromoacetyl polystyrene (BEPS)beads were synthesized by Fridel-Crafts acetylation of polystyrene (PS) and bromination of EPS respectively. FTIR, XPS, and TG-TDG were employed to characterize their structures. The results revealed there are two types of bromine in the BEPS molecule. One is in the main chain of polystyrene and the other is in the acetyl. The results of TG-DTG showed that the rates of loss weight of PS, EPS, and BEPS were 92.7%, 92.2%, and 81.3% among the 300 ℃～500 ℃; 7.3%, 7.8%, and 18. 7% in 594 ℃, 660 ℃, and 584.8 ℃, respectively.     

抗meso-四(α,α,α,α-O-苯乙酰苯)卟啉抗体的酶学性质研究

利用小分子ｍｅｓｏ－四(α,α,α,α－Ｏ－苯乙酰苯)卟啉作为全抗原免疫小鼠,通过细胞融合等技术制备了单克隆抗体(ＭｃＡｂ)１Ｆ２,利用高效液相色谱(ＨＰＬＣ)、基质辅助激光解吸飞行时间质谱(ＭＡＬＤＩ/ＴＯＦＭＳ)证明纯化得到的单抗是很纯的．ＭｃＡｂ１Ｆ２的保留时间是２．６３ ｍｉｎ,亚型为ＩｇＧ２ａ,相对分子量为１５６ ６７８．８．ＭｃＡｂ １Ｆ２－卟啉复合物形成时,卟啉Ｓｏｒｅｔ带最大吸收峰从４０８ｎｍ红移到４１６ｎｍ,并有增色效应,说明ＭｃＡｂ１Ｆ２－卟啉是刚性且紧密结合．抗体酶稳定性很高,但比活力只有４．６８７ ５ Ｕ/ｍｇ,为天然酶ＨＲＰ的１．８９９%．抗体酶的Ｋｍ＝２０．２９ ｍｍｏｌ/Ｌ,ｋｃａｔ＝３９６．８２ ｍｉｎ－１,ｋｃａｔ/Ｋｍ＝１．９５５ ７×１０４Ｌ·ｍｏｌ－１·ｍｉｎ－１．     

A New Route for the Synthesis of N-Substituted Diketopiperazine Derivatives

Eight N-substituted diketopiperazines (DKPs) were synthesized by solid-phase protocols. The introduction of iminodiacetic acid (Ida) and followed another α-amino acid residue as the precursor of DKP framework made the present synthesis to be very facile and efficient.     

含取代嘧啶环的α-氯乙酰脲的合成及生物活性研究

含取代嘧啶环的α－氯乙酰脲的合成及生物活性研究＊薛思佳陈代进＊＊谭冬云张爱东（华中师范大学化学系武汉４３００７９）关键词嘧啶α－氯乙酰脲合成植物生长调节剂中图分类号Ｏ６２６．４１酰基脲类化合物具有杀虫，除草，调节植物生长等生物活性。为了寻找具有高活性...     

Synthesis of N-Phosphoryl Branched Peptides

H-phosphonates were conveniently prepared by direct transesterification of diphenyl phosphite (DPP) with the corresponding alcohols, without further purification they were reacted with branched peptide methyl ester (L-Leu2-L-LysOMe) through Atherton-Todd method, a series of different substituted alkyloxy (N-phosphoryl-L-Leu)2-L-LysOMe were synthesized, and their stmctures were confirmed by ^31P NMR, ESI-MS, ^1H NMR, ^13C NMR, IR and elemental analysis. The approach possesses the advantages of easy operation, high yield and inexpensive phosphorylating reagent.     

N-异丙基丙烯酰胺温度敏感性水凝胶相转变动力学研究及其应用

研究指出表观二级动力学方程可以很好地描述N-异丙基丙烯酰胺水凝胶的溶胀和消溶胀动力学.即溶胀动力学方程为dR/dt=k_1(R_e-R)~2,消溶胀动力学方程为-dR/dt=k_c(R-R_e)~2.把这种水凝胶用于分离高分子水溶液时可引入“单位溶张比分离循环的合理时耗”这样一个参量.它根据溶胀和消溶胀过程中的起始溶胀比、平衡溶胀比、表观溶胀动力学常数和表观消溶胀动力学常数求出.具体公式为△t_1(T_s,T_c)=2/[R_c(T_s)-R_0(T_s)]~2k_s(T_s)+15/[R_0(T_c)- R_s(T_c)]~2k_c(T_c)~(1/2)在理想情况下,分离过程的“总合理时耗”与△t_1成正比,比例系数为分离过程中的除水总量与干凝胶用量的比值,即△t_r=W_W/W_G·△t_1.当根据二个动力学方程求得的总时耗计算值处于(0.9△t_r,1.1△t_r)范围内时,表明所选干凝胶用量和循环溶胀比区段均合适.     

脱乙酰壳多糖膜对碘的吸附

脱乙酰壳多糖膜对碘的吸附陈天＊汪士新（扬州大学农学院有机化学教研室扬州２２５００９）关键词脱乙酰壳多糖，膜，碘，吸附１９９６－１１－０６收稿，１９９７－０６－１１修回江苏省教育委员会自然科学基金资助项目脱乙酰壳多糖高分子链中含有大量的游离氨基，表现出...