Adsorption performance and mechanism of pectin modified with β-cyclodextrin for Zn and Cu.

Removing heavy metals from aqueous solutions has drawn more and more attentions these years because of their serious global health challenge to human society. To develop an adsorbent with green, stable and high-efficiency for adsorption of heavy metals, pectin β-cyclodextrin composite was successfully prepared and used for Zn and Cu adsorption for the first time. Various variables that influence the adsorption performance were explored, and the optimal adsorption conditions were determined.

Optimization and characterization of pectin extracted from hawthorn by deep eutectic solvent.

In this study, hawthorn pectin was extracted from dried hawthorn with deep eutectic solvent(DES) and compared with the traditional extraction methods such as acid extraction (AE) and ultrasonic-assisted extraction (UAE). Under optimal conditions, with a molar ratio of choline chloride to urea at 1:3, a water content of 30 %, a liquid-to-solid ratio of 30:1 (mL/g), an extraction temperature of 80 °C, an extraction time of 60 min, and a pH of 1, the yield of hawthorn pectin was 4.33 % ± 0.

[Molecular identification and genetic diversity in Konnyaku's soft rot bacteria].

The soft rot bacteria Erwinia are an important pathogens of konnyaku and other ornamental plants. Thirty-three strains were isolated from soft-rotted konnyaku and other ornamental plants. According to the characteristics of pathogenicity and culture character on semi selective medium (crystal violet pectate, CVP), most of strains tested caused rotten symptom in tubers and stems of konnyaku, and characteristic deep cavities were formed on CVP.