Effects of combined zinc chloride-ultrasound pretreatment and thermal modification on the physicochemical properties of Moso bamboo

An environmentally friendly and efficient method for the synthesis of indeno[2,1-c]quinolines is developed using a urea/zinc chloride eutectic mixture as a green mildly acidic medium.

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Changes on the Structural and Physicochemical Properties of Conjugates Prepared by the Maillard Reaction of Black Bean Protein Isolates and Glucose with Ultrasound Pretreatment

Polymers ◽

10.3390/polym11050848 ◽

2019 ◽

Vol 11 (5) ◽

pp. 848 ◽

Cited By ~ 9

Author(s):

Hua Jin ◽

Qingshan Zhao ◽

Haiying Feng ◽

Yuxin Wang ◽

Jubing Wang ◽

...

Keyword(s):

Physicochemical Properties ◽

Maillard Reaction ◽

Bathochromic Shift ◽

Surface Hydrophobicity ◽

Protein Isolate ◽

Black Bean ◽

Secondary Structure Analysis ◽

Emulsification Property ◽

Ultrasound Pretreatment ◽

Bean Protein

The conjugates of black bean protein isolate (BBPI) and glucose (G) were prepared via the wet heating Maillard reaction with ultrasound pretreatment. The physicochemical properties of UBBPI-G conjugates prepared by ultrasound pretreatment Maillard reaction had been compared with classical Maillard reaction (BBPI-G). The reaction rate between BBPI and glucose was speeded up by ultrasound pretreatment. A degree of glycation (DG) of 20.49 was achieved by 2 h treatment for UBBPI-G, whereas 5 h was required using the classical heating. SDS-PAGE patterns revealed that the BBPI-G conjugates with higher molecular weight were formed after glycosylation. The results of secondary structure analysis suggested that the α-helix and β-sheet content of UBBPI-G were lower than that of BBPI-G. In addition, UBBPI-G conjugates had exhibited bathochromic shift compared with BBPI by fluorescence spectroscopy analysis. Finally, UBBPI-G achieved higher level of surface hydrophobicity, solubility, emulsification property and antioxidant activity than BBPI and BBPI-G (classical Maillard reaction).

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The Influence of Saturated Steam on Moso Bamboo Quasi-static Micromechanical Properties: Nano-Scale Evaluation

10.21203/rs.3.rs-590616/v1 ◽

2021 ◽

Author(s):

Tiancheng Yuan ◽

Zhaoshun Wang ◽

Xin Han ◽

ZhuRun Yuan ◽

XinZhou Wang ◽

...

Keyword(s):

Heat Treatment ◽

Cell Wall ◽

Crystallinity Index ◽

Thermal Modification ◽

Moso Bamboo ◽

Saturated Steam ◽

Static Properties ◽

Tan Δ ◽

Increasing Temperature ◽

Steam Heat

Abstract In this paper, in order to analyze the quasi-static properties of Moso bamboo, a new, environmentally friendly and eco-friendly method was used for bamboo thermal modification under the effect of saturated steam. Under saturated steam heat treatment, the chemical composition in bamboo decreased, and the bamboo cell wall shrunk slightly. The increased crystallinity index of cellulose and decreased intensity of peaks belong to hemicellulose were confirmed by XRD and Fourier transform infrared (FTIR) spectroscopy. In addition, the highest modulus of elastic and hardness of treated bamboo were 22.5GPa and 1.1GPa at 180℃/10 min. These conclusions confirmed the micro-mechanical properties of the bamboo cell wall were enhanced by saturated steam heat treatment. The E'r of differently treated bamboo increased with increasing temperature and time, while the E''r and tan δ negatively as a function of increasing frequency. Furthermore, this thermal modification can be regarded as a useful, environmental-friendly and eco-friendly treatment to outdoor use of bamboo-based materials.

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Prediction of the color variation of moso bamboo during CO2 laser thermal modification

BioResources ◽

10.15376/biores.15.3.5049-5057 ◽

2020 ◽

Vol 15 (3) ◽

pp. 5049-5057

Author(s):

Rongrong Li ◽

Jingjing Chen ◽

Xiaodong Alice Wang

Keyword(s):

Response Surface Methodology ◽

Response Surface ◽

Co2 Laser ◽

Feed Rate ◽

Thermal Modification ◽

Moso Bamboo ◽

Color Variation ◽

Surface Color ◽

Sweep Width ◽

Laser Emitter

Thermal modification is widely used for bamboo materials as an efficient modification method. CO2 laser with the advantages of high energy density, short process period, non-pollution, etc. could be applied as a novel thermal treatment for wooden and bamboo materials processing. The laser intensity argumentation of power, motion arguments of feed rate, and sweep width for laser emitter were selected as input arguments for treating the Moso bamboo surface. The lightness variation and total color variation (∆L* and ∆E*) were collected using a portable colorimeter to describe the bamboo surface color variation after laser irradiation. Response surface methodology was chosen for designing experiments and modeling. The results showed that the increase of laser power had a positive influence on increasing the absolute values of ∆L* and ∆E*, but the feed rate of laser emitter and sweep width increasing had opposite effects on absolute values of ∆L* and ∆E*. The quadratic models of ∆L* and ∆E* created by response surface methodology were competent for describing the relationship between laser processing arguments and color indexes of ∆L* and ∆E*. This approach will be useful for selecting suitable and desirable processing arguments to get the surface color of bamboo productions.

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