Modification of physicochemical and mechanical properties of shellac by partial hydrolysis

Limmatvapirat, Sontaya; Limmatvapirat, Chutima; Luangtana‐anan, Manee; Nunthanid, Jurairat; Oguchi, Tamio; Tozuka, Yuichi; Yamamoto, Keiji; Puttipipatkhachorn, Satit

doi:10.1016/j.ijpharm.2004.02.030

Cited by 117 publications

(59 citation statements)

References 16 publications

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“…The thickness of the films was determined by using a digital micrometer (Wuxi, Jiangsu) and measurements were taken at 10 random positions of the film. The WVP of the films was calculated using the following equation [24,25]:…”

Section: Water Vapor Permeability (Wvp)mentioning

confidence: 99%

Aqueous coating dispersion (pseudolatex) of zein improves formulation of sustained-release tablets containing very water-soluble drug

Guo

Heinämäki

2010

Journal of Colloid and Interface Science

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Section: Water Vapor Permeability (Wvp)mentioning

confidence: 99%

Aqueous coating dispersion (pseudolatex) of zein improves formulation of sustained-release tablets containing very water-soluble drug

Guo

Heinämäki

2010

Journal of Colloid and Interface Science

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“…Shellac improved the properties of chitin since shellac is insoluble in alkali and a natural biomolecule secreted by the lac insect. It is a polymer formed of one carboxyl group, three ester bonds, five hydroxyl groups, and one aldehyde group , . The immobilized enzyme and free enzymes are employed to catalyze the conversion of formaldehyde to methanol.…”

Section: Carrier Materialsmentioning

confidence: 99%

Immobilization of Lipases – A Review. Part II: Carrier Materials

Thangaraj

Solomon

2019

ChemBioEng Reviews

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Carriers used in the immobilization process play a major role in enhancing the properties of the biocatalyst. Polymers are used as organic carriers for enzyme immobilization to improve the thermal, chemical, and operational stability of the enzyme. A variety of carriers are used in the immobilization of enzymes, e.g., mica, silica, zeolites, hydrotalcites, activated carbon, gold and magnetic nanoparticles. Silica‐based carriers offer suitable matrices for enzyme immobilization to manufacture industrial products. Immobilization on nanoparticles has become attractive in biocatalytic applications due to the combination of physical, chemical, catalytic, electronic, and optical properties. Gold nanoparticles also have received attention in the preparation of biocatalysts due to the above‐mentioned reasons. Magnetic nanoparticles are used as a carrier since they can be isolated by an external magnetic field, which is of special interest in the synthesis of organic products such as biodiesel. Different carrier materials involved in the immobilization of enzymes are discussed in this paper.

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“…The Young's modulus exponentially decreased. According to Limmatvapirat et al (2004), the major part of shellac is composed of a hard resin that corresponds to a crystalline region formed through chain-to-chain ester bonds. The structure of the crystalline structure causes rigid and brittle characteristics of the shellac layer.…”

Section: The Effect Of Plasticizer On the Composite Mechanical Propermentioning

confidence: 99%

Preparation and Characterisation of Cellulose-Shellac Biocomposites

Obradovic¹,

Petibon²,

Fardim³

2017

BioResources

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Composite materials comprising a mixture of shellac resin as the matrix and cellulose as the reinforcement were developed. The influence of the reinforcement content and the concentration of additives on the mechanical performance and processing were investigated. A high content of cellulose and low concentrations of ethanol and polyethylene glycol produced biocomposites with high stress resistance and a high Young's modulus, whereas a low content of cellulose and a high concentration of additives gave samples a low Young's modulus and high elasticity. Two types of cellulose-based reinforcements with different polarity, namely, mechanically refined wood pulp and cellulose acetate butyrate particles, were compared. The efficiency of the composite over the two model reinforcements, i.e., hydrophilic and hydrophobic components, respectively, was also studied. Although particle reinforcement was easier to process and evenly dispersed into the matrix, its mechanical performance was lower compared with refined fibres. Scanning electron microscopy showed that the matrix better coated the fibres than the particles, resulting in better adhesion and mechanical performance. The morphology of reinforcement played a key role; long fibres oriented in the pulling direction ensured a better mechanical resistance than particle fillers.

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Modification of physicochemical and mechanical properties of shellac by partial hydrolysis

Cited by 117 publications

References 16 publications

Aqueous coating dispersion (pseudolatex) of zein improves formulation of sustained-release tablets containing very water-soluble drug

Aqueous coating dispersion (pseudolatex) of zein improves formulation of sustained-release tablets containing very water-soluble drug

Immobilization of Lipases – A Review. Part II: Carrier Materials

Preparation and Characterisation of Cellulose-Shellac Biocomposites

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