FOOD CHEMISTRY
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2024
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IF 8.5
Bolin Xu,Xiujun Lin,Yang Zhao,Chengpeng Yin,Yang Cheng,Xue Li,Yang Li
Oleogels containing bioactive substances such as citral (CT) are used as functional food ingredients. However, little information is available on the influence of different oleogel network structure caused by CT addition and fatty acid distribution on its digestion behavior. Coconut oil, palm oil, high oleic peanut oil, safflower seed oil, and perilla seed oil were used in this study. The results showed that perilla seed oil-CT-based oleogels had the highest oil-holding capacity (99.03 ± 0.3), whereas CT addition higher than 10 wt% could lead to the morphology collapse of oleogels. Physical and thermodynamic analyses revealed that CT could reduce oleogel hardness and higher unsaturated fatty acid content is more likely to form oleogel with stable and tight crystalline network. Moreover, the dense structure of oleogels hinders the contact between oleogels and lipase, thus weakening triglyceride digestion. These findings provide valuable insights into the design of oleogels loading with CT.
研究领域:
食品科学
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化学
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营养学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2022
·Vol. 12
·期 20
·6268-6284
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IF 6.177
Tingyu Liang,Jialing Chen,Sen Wang,Pengfei Wang,Zhangfeng Qin,Fang Jin,Mei Dong,Jianguo Wang,Weibin Fan
A series of H-MCM-22 zeolites with different Si/Al ratios (H-M22-x, x = 15–90) were hydrothermally synthesized by boron incorporation to investigate the influences of acid density on the methanol-to-hydrocarbon (MTH) performances and deactivation behaviors. The acid density of H-M22-x zeolites is nearly proportional to their aluminum contents; the residual boron barely affects the overall acidity of H-M22-x zeolites. 27Al and 29Si MAS NMR experiments support the existence of competitive occupancy of various framework T sites among boron, aluminum and silicon during zeolite synthesis, which leads to different distribution of Brønsted acid sites/framework aluminum among three types of pores in H-MCM-22 zeolites. Increasing the Si/Al ratio of H-M22-x zeolites leads to a gradual increase in the proportion of Brønsted acid sites in supercages while those in sinusoidal channels decrease. However, the acid density has a significantly larger impact than acid distribution on the MTH performances of H-M22-x zeolites. Increasing the acid density can accelerate the hydrogen transfer reactions in the MTH conversion and promote the formation of aromatics, ethene, and alkanes. The deactivation of H-M22-x zeolites with low acid density (x = 50–90) is mainly ascribed to coke covering the acid sites inside the micropores and partly blocking the pore mouths. Nevertheless, the deactivation of H-M22-x zeolites with high acid density (x = 15–30) is mainly caused by massive coke deposition on the external surface which blocks the pore mouths of inner micropores. The coke on the external surface exhibits a lower decomposition temperature than that inside the micropores. The deactivation behaviors of H-M22-x zeolites for the MTH reaction can be divided into three stages. Firstly, rapid deactivation of supercages occurred for all the H-M22-x zeolites in spite of their different acid densities, suggesting a much stronger influence of pore structure than acidity on the initial deactivation behaviors of H-M22-x zeolites. Secondly, the acid sites in sinusoidal channels of H-M22-x zeolites are highly resistant to coke formation, which dominates the MTH reaction in the second stage. Finally, with the continuous formation of coke in the surface pockets, which gradually covers the acid sites and pore mouths of sinusoidal channels, complete deactivation of H-M22-x zeolites can be observed. GC-MS and UV-vis analysis of partly or completely deactivated H-M22-x zeolites reveals that the retained species in H-M22-x zeolites gradually condense into bulky hydrocarbon species through successive hydrogen transfer reactions and form methylbenzenes, naphthalene, polymethylnaphthalenes, phenalenone, pyrenes and eventually graphite-like carbonaceous species.
研究领域:
催化化学
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材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL DAIRY JOURNAL
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2021
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IF 3.032
Lin Yang,Yan Zhao,Fang Wang,Jie Luo
The regiodistribution of fatty acids (FAs) in triacylglycerols plays a critical role in the digestion and adsorption of milk lipids . However, the stereospecific location of FAs in yak milk triacylglycerols remains unknown. In this study, the intrapositional and interpositional distribution of FAs in the yak milk from different pastoral areas were compared with those of human milk and cow milk. When compared with human milk, the stereospecific locations of FAs were relatively similar between yak milk and cow milk. However, White yak milk and human milk contained similar interpositional proportions of linoleic, α -linolenic acid and polyunsaturated FAs at the sn -3 position, significantly higher than those of cow milk. Moreover, the sn -3 interpositional proportion of α-linolenic acid in Maiwa yak milk was even higher than that in human milk. The study suggests that yak milk might provide better nutritional benefits as a source of essential FAs than cow milk.
研究领域:
食品科学
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动物学
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营养学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2025
·
IF 7.9
Yong Yu,Feng Ji,Shaojie Gao,Chengwei Deng,Bowen Zheng,Weiwei Cai
High-temperature proton exchange membrane fuel cells (HT-PEMFCs) exhibit strong tolerance to impurities in hydrogen, which enhances their potential for practical applications. However, the efficiency of gas, proton, and electron electrocatalytic interfaces remains suboptimal, leading to sluggish cathode reaction kinetics and significantly reducing platinum (Pt) utilization. In this study, quaternary ammonium-functionalized polybenzimidazole (QAPBI), where the quaternary ammonium groups form strong ion pair interactions with phosphate, is employed as a bifunctional ionomer in the cathode catalyst layer (CL). This modification facilitates the regulation of phosphate (PA) distribution within the cathode CL and simultaneously improves proton conduction efficiency. Consequently, well-structured three-phase interfaces are effectively established, and the adsorption of PA onto the catalyst surface is minimized, further enhancing Pt utilization. More importantly, the rapid adsorption of PA onto QAPBI reduces the migration and loss of PA during fuel cell operation, thereby enhancing long-term durability. As a result, the peak power density (PPD) of the QAPBI-based HT-PEMFC is increased by 42 % compared to conventional PTFE-based designs, with a corresponding improvement in durability of 37.5 %.
研究领域:
材料科学
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能源技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Yi Zhang,Feng Ji,Chengwei Deng,Jing Li,Weiwei Cai,Hansong Cheng
Polytetrafluoroethylene (PTFE) is the most widely used catalyst layer (CL) binder in a polybenzimidazole phosphoric acid (PBI–PA)-based high-temperature proton exchange membrane fuel cell (HT-PEMFC) due to its great hydrophobicity. However, PTFE also limits the formation of an effective triple-phase boundary (TPB) due to its strong resistance to acid retention. To obtain the composite ionomer in the CL of HT-PEMFC, polybenzimidazole (PBI) is thus invited. Then, an in situ quaternization strategy on PBI is developed to increase the TPB concentration in CL by controlling the PA distribution and taking into account the superior PA retention capability of quaternary ammonium groups. At the same time, Pt active sites can be freed and mass transfer channels can be in situ constructed. Consequently, the corresponding HT-PEMFC fed with H2/O2 attains a maximum power density of 755 mW/cm2 and an electrochemical surface area of 35.56 cm2/mgPt, surpassing those equipped with PTFE by 10 and 30%, respectively. The electrochemical performance improvement indicates that the in-situ quaternization strategy on the ionomer has great application potential in practical HT-PEMFC manufacturing.
研究领域:
能源材料科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）