离子交换树脂调控黄冠梨汁色值研究

以黄冠梨试材,研究离子交换树脂对色值稳定性影响,重点明确离子交换树脂对不同腐烂程度果汁的色值调控效果。采用离子交换树脂与活性炭两种方法对果汁分别进行处理,同时三种离子交换树脂进行组合,比较色值、色值稳定性、总酚含量、氨基态氮含量的变化,结果表明:离子交换树脂组合处理的不同烂果率梨汁色值下降缓慢、色值稳定性显著提高、总酚含量以及氨基态氮含量相对下降,烂果率达到6%时能在40 d内满足车间要求的T440保持在45%以上的要求。其中,采用离子交换树脂组合处理烂果率6%浓缩汁得到最佳指标,36 d时色值稳定在透光率54.3%左右,d T440稳定在35%左右,氨基态氮下降50 mg/100 g,总酚下降25 mg/100 g。

为士果胶酶加工砀山酥梨浓缩清汁的应用

酶制剂在加工果蔬浓缩清汁方面起着重要的作用,酶制剂的功能影响着果蔬汁质量的好坏,现对为士果胶酶在线生产砀山酥梨清汁的研究,说明该种酶制剂结合其他工艺条件表现出来的功能,结果表明,可以提高产品色值稳定性,提高生产过程超滤通量,降低产品浊度。

Synthesis of a novel organic nonlinear optical chromophore and the Testing for μ_gβ Value

A novel second-order nonlinear optical chromophore （DCDHF-2-V） was synthesized from 3-Hydroxy-3-methyl-2-butanae, propanedinitrile and 4-diethylaminobenzaldehyde by aldol condensation reaction. Molecular structural characterization was investigated by elemental analysis, FTIR, and 1H-NMR spectra. The melting point obtained from DSC thermogram was almost 251 ℃, and the compound shows a thermal stability up to 270 ℃. Second-order NLO properties of the chromophore were measured by solvatochromic method. From the quantum-mechanical two-level model, it can be obtained that the μgβ value of DCDHF-2-V is 6520×10^-48esu atthe wavelength of 1064 nm.