FIBERS AND POLYMERS
·
2016
·Vol. 17
·期 2
·305-309
·
IF 1.022
Yu Yalun,Cai Muyuan,Zhou Lan,Shao Jianzhong
The accumulation and autoxidation of residual oily soil from human sebum is regarded as a major reason for the aging and yellowing of clothing and household textiles. In this study, the yellowing degree of cotton fabrics soiled with human sebum components and aged under various environmental conditions (various temperatures, humidities and light intensities etc.) were investigated. The representative sebum components including olive oil, squalene, oleic acid and cottonseed oil were selected and their chemical changes were studied by FTIR analysis. The results showed that, olive oil, squalene, oleic acid and cottonseed oil could caused more significant fabric-yellowing than other components in human sebum, and the yellowing degree could become higher with increasing temperatures, humidities and/or light intensities of aging environments. The chemical structures of olive oil, squalene and oleic acid changed remarkably after aging treatment. The aging products contained hydroxyl groups and carbonyl groups, and the conjugated C=O group was considered to be the chemical species leading to the yellowing of sebum-soiled fabrics.
研究领域:
纺织科学
·
生物化学
✓ 已验证
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 5
·1056
·
IF 3.1
Xuefeng Bai,Han Zhang,Yu Tu,Sijia Sun,Yangzi Li,Hao Ding,Ming Bai,Liang Chang,Jianmeng Zhang
In order to enhance the degree of binding reaction of TiO2in titanium-containing ceramic glazes and prevent the reaction of its transformation into rutile to eliminate the yellowing phenomenon of the glaze surface, an apatite–TiO2composite opacifier (ATO) was prepared through the mechanical grinding of hydroxyapatite and anatase TiO2. The properties, opacification mechanism, and yellowing inhibition of the prepared ceramic glazes were studied. The results show that the ATO is characterized by a uniform coating of TiO2on the surface of the apatite and the formation of close chemical bonding between the apatite and TiO2. The ceramic glaze surface when using an ATO has a white appearance and excellent opacification performance. When an ATO was used, the L*, a*, and b* values of the glaze were 89.99, −0.85, and 3.37, respectively, which were comparable to those of a ZrSiO4glaze (L*, a*, and b*were 88.24, −0.02, and 2.29, respectively). The opacification of the glaze was slightly lower than that of the TiO2glaze (L* value was 92.13), but the appearance changed from yellow to the white of the TiO2glaze (b* value was 9.18). The ceramic glaze layer when using an ATO mainly consists of titanite, glass phase, and a small amount of quartz, and the opacification mechanism is the crystallization of the generated titanite. ATOs can play an active role in solving the critical problem that arises when TiO2replaces ZrSiO4as an opacifier.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Yuqian Liu,Jinguang Liu,Caiyun Tang,Victoria Anthony Uyanga,Longhua Xu,Fengjiao Zhang,Jingyu Sun,Yilun Chen
Flavonoids are the main metabolites responsible for yellowing of rice. However, the accumulation pattern of flavonoids and the metabolic basis of flavonoid biosynthesis during rice yellowing remain unclear. Thus, flavonoid-targeted metabolomics was used to investigate the composition and concentration of flavonoids in rice during yellowing. The results indicated the differential flavonoids at Month 3 and Month 5 of storage were more in composition and concentration with higher antioxidant capacity. Accumulated flavonoids were mainly flavones, flavonols, isoflavones, and anthocyanidins, of which rutin, farrerol, naringenin , cyanidin 3-rutinoside, and diosmetin were the indicators of rice yellowing. Metabolic association among flavonoids demonstrated the formation of yellow pigments was jointly induced by flavones, flavonols, isoflavones, and anthocyanidins metabolism. Examination of flavonoid metabolism presented in this study enhanced current understanding of the relationship between flavonoid metabolites and development of rice yellowing. It also offers a theoretical basis for targeted prediction of rice yellowing in the future.
研究领域:
植物学
·
食品科学
·
代谢组学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Guangqi Hu,Yuqiong Sun,Yixuan Xie,Shuangshuang Wu,Xuejie Zhang,Jianle Zhuang,Chaofan Hu,Bingfu Lei,Yingliang Liu
UV absorbers are very effective in the fields of antiyellowing, resistance of photocatalytic degradation, and sunscreen cosmetics. However, commercialized UV absorbers have the drawbacks of toxicity, low absorption efficiency, transparency, etc. Here, we report for the first time silicon quantum dots as full-band UV absorbers. The NH-refunctionalized silicon quantum dots with high-performance UV absorption were successfully synthesized under the synergistic effect of sodium citrate and ethanediamine, and the (NH, OH)-functionalized silicon quantum dots (SiQDs) with full-band UV absorption can be achieved by reregulating −NH2 and −OH groups on the surface. The as-prepared (NH, OH)-functionalized SiQDs exhibited good stability and underwent treatment of varying pH and temperature. Furthermore, experimental results demonstrated that compared to commercial water-soluble organic UV absorbers, the (NH, OH)-functionalized SiQDs showed better antiyellowing performance for polyurethane and resistance of photocatalytic degradation for rhodamine B, and presented huge application potential in sunscreen cosmetics. Finally, the UV absorption mechanism of SiQDs was explained to be mainly related to Γ → Γ direct band gap transition, which absorb UV light and release it as thermal radiation.
研究领域:
材料科学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Food Chemistry-X
·
2025
·
IF 8.2
Shanshan Wu,Dingwu Zhang,Siyi Hu,Cunyu Li,Zhanbo Dong,Yurong Hu,Fangyuan Fan,Jianhui Ye,Xinqiang Zheng,Yuerong Liang,Liaoyuan Yu,Jianliang Lu
Lack of optimal sealed yellowing (SY) technique and suitable tea cultivars limits the yield and quality improvement of the Pingyang Huangtang (PYHT) tea. In this study, the effect of SY temperature, relative humidity (RH) and ventilation operation on the PYHT quality had been investigated. Results showed total sensory score was significantly influenced by SY temperature and RH, and optimal PYHT quality could be achieved when SY was performed at 60 °C, 70 % RH for 10 h with 2 ventilation operation. Quality formation of PYHT was mainly associated with degradation of chlorophylls, fluctuation of volatile with different odor notes, and decrease in level of galloylated catechins and the ratio of total polyphenols to amino acids. The quality of tea made from the shoots of ‘Zhenong 801’, ‘Zhongcha 108’, ‘Jiukengzao’ and ‘5–21’ was higher than that of the commonly used cultivar ‘Pingyang Tezao’, therefore, these cultivars were recommended to apply in PYHT industry.
研究领域:
食品科学
·
茶叶加工学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CEREAL SCIENCE
·
2020
·
IF 2.938
Jinguang Liu,Meng Liu,Yuqian Liu,Meng Jia,Saimin Wang,Xuedong Kang,Hui Sun,Padraig Strappe,Zhongkai Zhou
Differences in volatile compounds and the changes in physicochemical properties during the yellowing of glutinous rice were analyzed for investigating its association with water content during storage. The physicochemical analysis indicated that the yellowing led to an enhanced rice viscosity and reduced pasting temperature. More importantly, rice yellowing at higher moisture content resulted in a greater difference in the pasting properties between fresh and the yellowed rice. The changes in the rheological properties of rice appeared to be more sensitive to the initial moisture content, in particular at high moisture condition. In addition, the parameter tanδ might be a key indicator in highlighting the association of rice yellowing with its corresponding dynamic rheological properties. Specially, the volatile compounds detected by gas chromatography-ion mobility spectrometry (GC-IMS) and gas chromatography-mass spectrometry (GC-MS) showed that most of volatile compounds were decreased following the rice yellowing process, which was independent to the initial moisture content of the storage, and the increased level of the storage moisture enhanced the loss of the volatile compounds. Nevertheless, the newly formed volatile compounds during the rice yellowing still noted, and the increase of 1,2,4-trimethyl-bnzene and the decrease of phenol may be the potent to indicating of rice yellowing.
研究领域:
食品科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2022
·
IF 5.204
Shengdi Yan,Guozhang Wu
The thermal degradation mechanism and stabilization strategies of isosorbide (ISB)- co -1,4-cyclohexanedimethanol (CHDM) polycarbonate (I c C-PC) and I c C-PC/bisphenol-A polycarbonate (BPA-PC) blends were systematically investigated. I c C-PC is more prone to molecular weight decrease and yellowing than BPA-PC during high-temperature processing. MALDI-TOF-MS and 1 H-NMR analysis results show that ISB-PC and CHDM-PC underwent hydrolysis, β-elimination, and ISB-unit oxidation reactions, in which the former two reactions reduced molecular weight, and the latter induced yellowing. The addition of phosphite antioxidants, which have a strong peroxide removal ability, and free radical scavengers with low steric hindrance can inhibit the hydrolysis and ISB-unit oxidation. Accordingly, the thermal stability of I c C-PC is significantly improved. By reducing the reaction time (even if the catalysts loading is increased) and adding antioxidants, the thermal stability of reactive blends can be further improved, and the I c C-PC/BPA-PC transparent alloys close to the PC raw materials were prepared.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2019
·
IF 5.399
Yue Xiao,Wenting Shang,Jinguang Liu,Hui Sun,Padraig Strappe,Zhongkai Zhou
Pasting properties indicated that the yellowing process led to a reduced peak viscosity and breakdown value of the postharvest yellowing (PHY) rice compared to corresponding normal one. More importantly, the current study revealed that both moduli of G′ and G″ of the gel formed from the PHY rice was lower than that of its corresponding rice and the yellowing significantly reduced the area of the hysteresis curve. Thus, it is proposed that PHY may inhibit the formation of a continuous network structure. Studies of moisture absorption dynamics and low-field NMR suggested that the yellowing process led to a faster moisture absorption and de-absorption, indicating a faster moisture fluidity in rice kernels induced by yellowing process. Potent of the “capillary channels” might be formed during rice yellowing, and these structural characteristics may be associated with its higher digestibility due to the accelerated diffusion of the digestive enzymes in rice kernels.
研究领域:
食品科学
·
植物生理学
✓ 已验证
DOI
高影响因子
POLYMER TESTING
·
2022
·
IF 4.931
Chao Wu,Bing Chen Meng,Lik-ho Tam,Li He
Polymer resins have yellowing issue when subjected to elevated temperatures or UV exposure, which limit their applications in color-sensitive fields. This paper presents an experimental study on the yellowing mechanisms of epoxy and vinyl ester resins under thermal, UV and natural aging conditions. Anti-yellowing methods including air isolation, antioxidant, UV absorber are selected and their effectiveness is assessed. The resins before/and after aging are characterized to analyze their yellowing index, surface morphology, weight loss, mechanical properties (i.e. modulus and Vickers hardness), glass transition temperature and FT-IR spectra. The yellowing mechanisms and the influencing factors are discussed. It is found that the resin yellowing is a result of radical oxidation reaction due to aging, which forms chromophores such as carbonyl groups, double bonds and conjugated structures. Vinyl ester has better yellowing resistance than epoxy. Antioxidant and UV absorber are not effective in terms of anti-yellowing effect, but air isolation has the best performance to slow down the yellowing process. Yellowing in natural environment can be more complicated due to other factors like moisture, wet-dry cycles etc. This study provides an experimental evidence for the study of yellowing mechanisms of polymer resins.
研究领域:
材料科学
·
聚合物化学
✓ 已验证
产品关联
DOI
高影响因子
AIP Advances
·
2021
·Vol. 11
·期 7
·
IF 1.548
Zeng Jun,Wang Han,Chen Xindu,Wu Peixuan,Chen Xin,Tang Yadong,Zhang RongGuang,Feng Liang,Xu Guojie
At present, nanofiber antibacterial materials, especially silver antibacterial materials, are one of the most popular antibacterial materials. Nanofiber antibacterial materials are the most widely used materials due to their antibacterial spectrum and persistence. In fact, the storage and anti-yellowing properties of nanofiber antibacterial materials are of great concern in the application of industrial and consumer goods. However, there are few studies on the uniform preparation, storage, and anti-yellowing properties of antibacterial materials. Thus, we prepared nanofiber antibacterial materials by adding surfactants and studied the dispersion and storage time of the spinning solution. After spinning and forming the membrane, we tried to study the fiber morphology and environmental factors prepared by different proportions. Finally, we also tried to study the properties of the nanofiber membrane, such as contact angle, anti-yellowing, and antibacterial property. In a word, we explored the basic rules of material preparation, storage, and yellowing resistance so as to provide guidance for nanofiber antibacterial material industrial production.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 8
·1-7
·
IF 2.8
Wu Fang,Pu Zejun,Hou Hongbo,Li Xianyong,Zhu Rongli,Wang Xu,Yu DaYang,Zhong Jiachun
Bioderived polycarbonate (ISB-PC) was synthesized via transesterification and polycondensation of isosorbide (ISB) and diphenyl carbonate (DPC) using lithium acetoacetone as a catalyst. The resulting ISB-PC exhibited high glass transition temperatures similar to bisphenol A polycarbonate (BPA-PC) and was thermally stable up to 350 ℃. The incorporation of isosorbitol into the polymer chain imparted an improved mechanical property of ISB-PC, such as a higher bending and tensile modulus and higher elongation at break. ISB-PC can be readily cast into transparent films with a tensile strength of 73.3 MPa and a tensile modulus of 534 MPa. ISB-PC displayed high UV transmittance and possessed blue fluorescence under UV irradiation. At the same time, ISB-PC also has strong anti-yellowing ability.
研究领域:
材料科学
·
化学工程
·
聚合物科学
✓ 已验证
DOI
高影响因子
Food Chemistry-X
·
2024
·
IF 6.5
Shunyao Qi,Tiexin Zeng,Peiling Wu,Le Sun,Zhengqi Dong,Lijia Xu,Peigen Xiao
The bitter and astringent taste and miscellaneous smell of vine tea prevent its further development. In this study, we used a processing technology that mimics yellow tea to improve the flavor of vine tea and revealed its internal reasons through metabolomics. Sensory evaluation showed the yellowing process for 6–12 h reduced the bitterness and astringency significantly, and enriched the aroma. The improvement of taste was mainly related to the down-regulation of anthocyanins (54.83–97.38%), the hydrolysis of gallated catechins (34.80–47.81%) and flavonol glycosides (18.56–44.96%), and the subsequent accumulation of d -glucose (33.68–78.04%) and gallic acid (220.96–252.09%). For aroma, increase of total volatile metabolite content (23.88–25.44%) and key compounds like geraniol (239.32–275.21%) induced the changes. These results identified the positive effects of yellowing process on improvements in vine tea flavor and the key compounds that contribute to these changes.
研究领域:
食品科学
·
代谢组学
·
茶叶加工技术
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）