Functionalities of chitosan conjugated with stearic acid and gallic acid and application of the modified chitosan in stabilizing labile aroma compounds in an oil-in-water emulsion

Q1 · AGRICULTURAL & FORESTRY SCIENCE

Article

Author: Yang, Tsung-Shi ; Liu, Tai-Ti ; Lin, I-Hwa

The aims of this research were to conjugate chitosan (CT) with stearic acid (SA) and gallic acid (GA), and apply the modified chitosan to stabilize labile aroma compounds such as allyl isothiocyanate (AITC) and limonene in oil-in-water emulsions. Generally, the antioxidant activity of CT-SA-GA increased as the GA content in the conjugate increased. In most assays, GA had a lower IC₅₀ value than that of CT-SA-GA; however, CT-SA-GA exhibited better performance than GA in the Fe²⁺-chelating activity. In accelerated tests (heating or illumination) for evaluating the chemical stability of AITC and limonene during storage, CT-SA and CT-SA-GA were used to prepare AITC and limonene O/W emulsions, respectively. Tween 80 and Span 80 (T-S-80), an emulsifier mixture, were used as a control in both emulsions for comparison. The results show that CT-SA or CT-SA-GA could protect AITC or limonene from degradation or oxidation more effectively than T-S-80.

MembranesQ4 · ENGINEERING & TECHNOLOGY

Removal of Organic Compounds with an Amino Group during the Nanofiltration Process

Q4 · ENGINEERING & TECHNOLOGY

ArticleOA

Author: Żyłła, Renata ; Olak-Kucharczyk, Magdalena ; Ledakowicz, Stanisław ; Marszałek, Joanna ; Foszpańczyk, Magdalena

The research covered the process of nanofiltration of low molecular weight organic compounds in aqueous solution. The article presents the results of experiments on membrane filtration of compounds containing amino groups in the aromatic ring and comparing them with the results for compounds without amino groups. The research was carried out for several commercial polymer membranes: HL, TS40, TS80, DL from various manufacturers. It has been shown that the presence of the amino group and its position in relation to the carboxyl group in the molecule affects the retention in the nanofiltration process. The research also included the oxidation products of selected pharmaceuticals. It has been shown that 4-Amino-3,5-dichlorophenol—a oxidation product of diclofenac and 4-ethylbenzaldehyde—a oxidation product of IBU, show poor separation efficiency on the selected commercial membranes, regardless of the pH value and the presence of natural organic matter (NOM). It has been shown that pre-ozonation of natural river water can improve the retention of pollutants removed.

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Indication	Highest Phase	Country/Location	Organization	Date
Mycoses	Phase 1	-	Shikoku Kasei Holdings Corp.	-

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