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All Journal PROSIDING SEMINAR KIMIA Unified Health Critical Research
Fadilah Ramadhani
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Chemistry Environmental Science Health Professions Public Health

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SYNTHESIS AND SWELLING PROPERTIES OF CHITOSAN-BASED HYDROGELS CROSSLINKED FORMALDEHYDE AND TRIPOLYPHOSPHATE Ramadhani, Fadilah; Pasaribu, Subur P.; Panggabean, Aman Sentosa
PROSIDING SEMINAR KIMIA Vol 2 No 1 (2023): Prosiding SNK 2023
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Hydrogel is a hydrophilic polymer network that can experience swelling with the ability to absorb and retain large amounts of liquid without decomposing and is widely applied in the fields of health, environment and agriculture. The swelling properties of hydrogels are influenced by the type of tissue and the density of crosslinks that form it. In this study the hydrogel was prepared by stirring a 2% chitosan solution (w/v) as much as 7 mL with 3 ml of formaldehyde-tripolyphosphate crosslinking mixture at variations of 3:0, 2:1, 1:1, 1:2 and 0:3 (v/v) at room temperature and swelling tests were carried out by immersing each hydrogel produced in aquades for a span of 24 hours at the same temperature. Based on the observations, the gel formation time was 420, 97, 84, 75 and 58 minutes respectively which showed the lower the chitosan concentration and the higher the tripolyphosphate, the faster the gel formation process. Then the degree of consecutive sweling was 581.43; 78,23; 75,17; 48.85 and 20.97% (w/w) indicate that covalent cross-networks formed by amine groups on chitosan with aldehyde groups on formaldehyde are more stable and more difficult to degrade than physical cross-networks formed by groups on chitosan and tripolyphosphates. Keywords: Hydrogel, Crosslinking, Chitosan-tripolyphosphate, Degree of swelling.
The Relationship between Exposure to Hand-Arm Vibration (HAV) and Work Fatigue in Tailors in Makassar Amalia, Alfiyyah; Ramadhani, Fadilah; Hafiza Ansar, Fahriyana; Nuriski, Muh Asril; Widiastuty, Lilis; Ekasari, Ranti
Unihealth Community Research Vol 2 No 2 (2026): March-August
Publisher : Universitas Islam Negeri Alauddin Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/ucr.v2i2.71116

Abstract

Encountering mechanical vibration represents a notable physical occupational risk that can lead to work-related health issues, including occupational fatigue, especially in jobs that require the repetitive operation of vibrating equipment, such as tailoring in the informal sector. This research sought to investigate the correlation between hand-arm vibration (HAV) exposure and work-related fatigue among informal-sector tailors in Makassar City. A quantitative, cross-sectional methodology was utilized, incorporating 30 participants chosen via simple random selection. Vibration exposure was quantified in m/s² using the ISO 5349-1:2001 standard, whereas occupational tiredness was evaluated via the tiredness Feeling Measurement Tool Questionnaire (KAUPK2). Bivariate data examination was performed via Fisher's Exact test. A significant portion of participants experienced minimal vibration exposure and indicated modest degrees of work-related weariness. Statistical examination indicated no significant correlation between hand-arm vibration exposure and work-related weariness (p>0.05). The results indicate that minimal vibration exposure might not be adequate to substantially provoke occupational tiredness in the studied group. The lack of a statistically significant correlation suggests that alternative factors might have a more considerable influence on the emergence of work-related weariness among tailors, especially considering the minimal vibration exposure noted in this environment. Additional investigation utilizing a longitudinal framework and an expanded sample population is advised to thoroughly assess the impact of vibration exposure and ergonomic elements on work-related weariness.
Co-Authors Amalia, Alfiyyah Aman Sentosa Panggabean Andri Ernawati Dr Ngadiman Hafiza Ansar, Fahriyana Lilis Widiastuty Memen Surahman Nuriski, Muh Asril Ranti Ekasari, Ranti Sigit Santosa Subur P Pasaribu