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Ding Y, Zhong B, Yang T, Zhang F, Liu C, Chi Z. Carboxyl-modified nanocellulose (cNC) enhances the stability of cNC/pullulan bio-nanocomposite hard capsule against moisture variation. Carbohydr Polym 2024; 328:121706. [PMID: 38220341 DOI: 10.1016/j.carbpol.2023.121706] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2023] [Revised: 11/30/2023] [Accepted: 12/15/2023] [Indexed: 01/16/2024]
Abstract
The quality of polysaccharide-based films and hard capsules is often affected by changes in relative humidity, manifesting as unstable water content, and changes in mechanical strength that make them brittle or soft. Herein, carboxyl-modified nanocellulose (cNC) was prepared and used as a new component to successfully improve the moisture resistance of cNC/pullulan/high-acyl gellan bio-nanocomposite hard capsules (NCPGs). Homogenously dispersed cNC in the pullulan/high-acyl gellan matrix could render the formation of more hydrogen bonds that provided additional water-binding sites and limited the free movement of pullulan and high-acyl gellan molecular chains within NCPGs. This contributed to a decreased amount of pooling adsorption water and an increased amount of Langmuir adsorption water in NCPGs, as compared to pullulan/high-acyl gellan hard capsules (PGs) without cNC. Therefore, the equilibrium moisture content (EMC) values of NCPGs decreased at 83 % relative humidity and increased at 23 % relative humidity compared to those of PGs. Together with enhanced mechanical and barrier properties, NCPGs effectively protected encapsulated amoxicillin and probiotic powder from changes in the outside humidity. Additionally, NCPGs exhibited faster drug release. This study presents a new mechanism and strategy for fabricating films and hard capsules with enhanced stability against moisture variation.
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Affiliation(s)
- Yuanyuan Ding
- College of Marine Life Sciences, Ocean University of China, No. 5 Yushan Road, 266003 Qingdao, China
| | - Bocun Zhong
- College of Marine Life Sciences, Ocean University of China, No. 5 Yushan Road, 266003 Qingdao, China
| | - Tenglin Yang
- College of Marine Life Sciences, Ocean University of China, No. 5 Yushan Road, 266003 Qingdao, China
| | - Fenglong Zhang
- College of Marine Life Sciences, Ocean University of China, No. 5 Yushan Road, 266003 Qingdao, China
| | - Chenguang Liu
- College of Marine Life Sciences, Ocean University of China, No. 5 Yushan Road, 266003 Qingdao, China
| | - Zhe Chi
- College of Marine Life Sciences, Ocean University of China, No. 5 Yushan Road, 266003 Qingdao, China.
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Gao M, Li J, Qiu L, Xia X, Cheng X, Xu F, Xu G, Wei F, Yang J, Hu Q, Cen Y. Glucose and pH responsive fluorescence detection system based on simple synthesis of silicon-coated perovskite quantum dots. Spectrochim Acta A Mol Biomol Spectrosc 2023; 289:122212. [PMID: 36512959 DOI: 10.1016/j.saa.2022.122212] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Revised: 11/20/2022] [Accepted: 12/02/2022] [Indexed: 06/17/2023]
Abstract
Perovskite quantum dots (PQDs) are extremely unstable in ambient air due to their inherent structural instability, which limits the wide application of PQDs. In this work, silicon-coated CsPbBr3 PQDs (CsPbBr3@SiO2) was synthesized via a simple method. The SiO2 coating effectively isolated PQDs from water and oxygen in the environment, which were the main elements that destroyed the structure stability of PQDs. The synthesized CsPbBr3@SiO2 can be stored in water for more than 2 months and posessed wonderful dispersibility in aqueous solution. The fluorescence intensity remained unchanged within 7 days and only decreased by 11.9 % within 2 months. We found that CsPbBr3@SiO2 was extremely sensitive to environmental pH, and the fluorescence intensity decreased with the reduction of pH. In addition, an excellent linear relationship with pH value in the range of 1.0 ∼ 5.0 was achieved. As we all known that glucose can be catalyzed by glucose oxidase to produce gluconic acid and hydrogen peroxide, in which a good deal of protons were produced and the pH was gradually lowered. Since CsPbBr3@SiO2 was stable to water and oxygen, and sensitive to ambient pH, we applied CsPbBr3@SiO2 to the detection of glucose. CsPbBr3@SiO2 showed fantastic selectivity and sensitivity to glucose, and the detection limit can even reach 18.5 μM. Furthermore, CsPbBr3@SiO2 was successfully applied to the detection of glucose in the human serum with satisfactory performance.
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Affiliation(s)
- Mingcong Gao
- School of Pharmacy, Nanjing Medical University, Nanjing, Jiangsu 211166, PR China
| | - Jiawei Li
- School of Pharmacy, Nanjing Medical University, Nanjing, Jiangsu 211166, PR China
| | - Lei Qiu
- School of Pharmacy, Nanjing Medical University, Nanjing, Jiangsu 211166, PR China
| | - Xinyi Xia
- School of Pharmacy, Nanjing Medical University, Nanjing, Jiangsu 211166, PR China
| | - Xia Cheng
- Department of Pharmacy, Ruijin Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai 200025, PR China
| | - Feifei Xu
- School of Pharmacy, Nanjing Medical University, Nanjing, Jiangsu 211166, PR China
| | - Guanhong Xu
- School of Pharmacy, Nanjing Medical University, Nanjing, Jiangsu 211166, PR China; Key Laboratory of Cardiovascular & Cerebrovascular Medicine, School of Pharmacy, Nanjing Medical University, Nanjing, Jiangsu 211166, PR China
| | - Fangdi Wei
- School of Pharmacy, Nanjing Medical University, Nanjing, Jiangsu 211166, PR China; Key Laboratory of Cardiovascular & Cerebrovascular Medicine, School of Pharmacy, Nanjing Medical University, Nanjing, Jiangsu 211166, PR China
| | - Jing Yang
- School of Pharmacy, Nanjing Medical University, Nanjing, Jiangsu 211166, PR China; Key Laboratory of Cardiovascular & Cerebrovascular Medicine, School of Pharmacy, Nanjing Medical University, Nanjing, Jiangsu 211166, PR China
| | - Qin Hu
- School of Pharmacy, Nanjing Medical University, Nanjing, Jiangsu 211166, PR China; Key Laboratory of Cardiovascular & Cerebrovascular Medicine, School of Pharmacy, Nanjing Medical University, Nanjing, Jiangsu 211166, PR China; Key Laboratory of Toxicology, Ningde Normal University, Ningde, Fujian 352000, PR China.
| | - Yao Cen
- School of Pharmacy, Nanjing Medical University, Nanjing, Jiangsu 211166, PR China; Key Laboratory of Cardiovascular & Cerebrovascular Medicine, School of Pharmacy, Nanjing Medical University, Nanjing, Jiangsu 211166, PR China.
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Zhuang X, Wang L, Jiang X, Chen Y, Zhou G. Insight into the mechanism of myofibrillar protein gel influenced by konjac glucomannan: Moisture stability and phase separation behavior. Food Chem 2020; 339:127941. [PMID: 33152853 DOI: 10.1016/j.foodchem.2020.127941] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Revised: 08/11/2020] [Accepted: 08/23/2020] [Indexed: 01/14/2023]
Abstract
The effect and mechanism of myofibrillar protein (MP) gelation influenced by konjac glucomannan (KG) addition were studied. The KG addition significantly improved gel strength and water holding capability (WHC) of MP-KG composite gel, but it had additive limitation at 1.0%. The SEM showed that KG (<1.0%) reduced the appearance of moisture channels and promoted the formation of an integral MP gel network. Raman spectroscopy showed that KG addition (<1.0%) promoted the protein unfolding and the interaction of hydrophobic groups during thermal processing. However, the KG (>1.0%) would form continuous viscous hydrogel and interpenetrate with the MP solution, which hindered the interaction of hydrophobic groups during thermal process, and the MP formed a loose and degraded final structure. Hence, MP gels produced with the addition of KG underwent a transformation from a loose structure to a compact structure to an unaggregated structure, which was influenced by moisture stability and phase separation behavior.
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Affiliation(s)
- Xinbo Zhuang
- College of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing 210023, Jiangsu, China; Key Lab of Meat Processing and Quality Control, MOE, Jiangsu Innovation Center of Meat Production and Processing, Synergetic Innovation Center of Food Safety and Nutrition, Nanjing Agricultural University, Nanjing 210095, China.
| | - Lijian Wang
- College of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing 210023, Jiangsu, China
| | - Xiping Jiang
- College of Science, Nanjing Agricultural University, Nanjing, 210095, China
| | - Yinji Chen
- College of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing 210023, Jiangsu, China.
| | - Guanghong Zhou
- Key Lab of Meat Processing and Quality Control, MOE, Jiangsu Innovation Center of Meat Production and Processing, Synergetic Innovation Center of Food Safety and Nutrition, Nanjing Agricultural University, Nanjing 210095, China.
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