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- 저자 : Chandrawati, Rona (검색결과 4 건)
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Polydiacetylene-based Colorimetric Sensors to Detect Food Spoilage
Rona Chandrawati 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Polydiacetylenes (PDAs) are a class of conjugated polymers with unique optical properties that make them excellent materials for the construction of colorimetric sensors. Diacetylene monomers polymerize when exposed to 254 nm UV light and polymerization typically yields blue-phase PDAs. Chemical/biological recognition events can induce a blue-to-red color transition of PDA detected by the naked eye. We report the synthesis and applications of PDA that enables low-cost monitoring of food spoilage (e.g. milk, meat and fruit). We investigated a range of monomers with different lengths of alkyl spacer and tail. To fabricate the film sensors, we stabilized PDA in polymer matrix. We successfully demonstrated the sensor application by integrating them into food packaging stored at -20 °C, 4 °C, and room temperature. The PDA sensors will provide a real-time indication of food quality, surpassing the function of traditional use-by dates that provide an indication of expected shelf life.
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Rita ARYANI,Widodo WIDODO,Chandrawaty CHANDRAWATY 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.6
This study investigates the effect of adversity quotient (AQ) and organizational justice on turnover intention mediating by affective commitment. This research uses a quantitative approach with a survey method using a Likert scale model questionnaire prepared by the researchers. All the questionnaire items were valid with corrected item-total correlation values >0.361. The questionnaire is also reliable at alpha coefficient >0.7. The respondents were 439 honorary teachers at private schools in Indonesia. Data analysis uses structural equation modeling (SEM) supported by correlational and descriptive statistics. Data processing used SPPS 26 and Lisrel 8.80. The research results reveal that all hypotheses are supported. AQ and organizational justice had a direct effect on affective commitment and turnover intention. AQ and organizational justice have also an indirect effect on turnover intention mediating by affective commitment. Besides, a new model of the effect of AQ and organizational justice on turnover intention mediating by affective commitment was confirmed. This research suggested that the teachers’ turnover intention can be reduced through AQ and organizational justice, mediating affective commitment. Therefore, practitioners can adopt the new empirical model to mitigate turnover intention. The new empirical model could also be explored and adopted in further research.
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Human Papillomavirus Screening in North Indian Women
Pandey, Saumya,Mishra, Malvika,Chandrawati, Chandrawati Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.6
Objectives: Human papillomavirus (HPV) is the major etiological agent of cervical cancer, a leading cause of morbidity and mortality in women worldwide. Screening strategies for reducing the burden of HPV-mediated carcinogenesis are emerging as an effective means for cervical cancer control and prevention in developing countries. Our study, therefore, aimed to identify HPV infection status in North Indian women during random population screening. Methodology: Cervical/vaginal exfoliated cells and/or Pap smear specimens were collected from 890 women of North Indian ethnicity residing in Lucknow and adjoining areas, during random population screening from June 2009-March 2012. HPV viral loads in clinical specimens were determined by the Hybrid Capture (hc)-2 HPV DNA assay, and subsequently, positive/negative/borderline HPV status was calculated. Results: The HPV incidence in the present study was 11.7%. 751 out of a total of 890 women (84.4%) participating in our HPV screening program were HPV negative (HPV -), 104 (11.7%) tested positive (HPV +) while 35 (3.9%) showed borderline (HPV $^*$) infection status. Furthermore, in the HPV + subjects (N=104), 18 (17.3%) showed strong positivity. We observed that HPV positivity tends to increase with age in North Indian women; the higher the viral load with increasing age, higher is the susceptibility to HPV-mediated cervical cancer. Conclusions: HPV viral load/genotyping may help in identifying women at risk of developing cervical cancer. However, cost-effective HPV screening protocols with a wider population coverage are warranted so as to reduce the burden of cervical cancer in women worldwide in the vaccine-era.
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Stabilization of Polymer-Hydrogel Capsules via Thiol–Disulfide Exchange
Chong, Siow-Feng,Chandrawati, Rona,Stä,dler, Brigitte,Park, Jeongju,Cho, Jinhan,Wang, Yajun,Jia, Zhongfan,Bulmus, Volga,Davis, Thomas P.,Zelikin, Alexander N.,Caruso, Frank WILEY-VCH Verlag 2009 Small Vol.5 No.22
<P>Polymer hydrogels are used in diverse biomedical applications including drug delivery and tissue engineering. Among different chemical linkages, the natural and reversible thiol–disulfide interconversion is extensively explored to stabilize hydrogels. The creation of macro-, micro-, and nanoscale disulfide-stabilized hydrogels commonly relies on the use of oxidizing agents that may have a detrimental effect on encapsulated cargo. Herein an oxidization-free approach to create disulfide-stabilized polymer hydrogels via a thiol–disulfide exchange reaction is reported. In particular, thiolated poly(methacrylic acid) is used and the conditions of polymer crosslinking in solution and on colloidal porous and solid microparticles are established. In the latter case, removal of the core particles yields stable, hollow, disulfide-crosslinked hydrogel capsules. Further, a procedure is developed to achieve efficient disulfide crosslinking of multilayered polymer films to obtain stable, liposome-loaded polymer-hydrogel capsules that contain functional enzymatic cargo within the liposomal subcompartments. This approach is envisaged to facilitate the development of biomedical applications of hydrogels, specifically those including fragile cargo.</P> <B>Graphic Abstract</B> <P>Polymer-hydrogel capsules are stabilized via disulfide linkages whereby crosslinking relies on the thiol–disulfide exchange without the use of oxidizing agents (see image). The method permits the formation of hollow capsules as well as functional capsosomes, hydrogel capsules subcompartmentalized with enzyme-loaded liposomes, without the loss of activity of liposome-encapsulated enzymes. <img src='wiley_img/16136810-2009-5-22-SMLL200900906-content.gif' alt='wiley_img/16136810-2009-5-22-SMLL200900906-content'> </P>
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