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All Journal Jurnal Ilmiah Teknik Industri International Journal of Social Science, Educational, Economics, Agriculture Research, and Technology (IJSET)
Siwi Putri Andini
Universitas Jakarta Internasional
Agriculture, Biological Sciences & Forestry Humanities Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Industrial & Manufacturing Engineering Transportation

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PRODUKSI XANTHAN GUM SKALA PENGEMBANGAN MENGGUNAKAN LIMBAH PADAT TAPIOKA Akhmad Endang Zainal Hasan; Aton Yulianto; Ika Mulawati Purwanti Noviana; Siwi Putri Andini
Jurnal Ilmiah Teknik Industri Vol 6, No 2 (2018): Jurnal Ilmiah Teknik Industri (Jurnal Keilmuan Teknik dan Manajemen Industri)
Publisher : Program Studi Teknik Industri, Fakultas Teknik Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/jitiuntar.v6i2.4117

Abstract

Xanthan gum merupakan polisakarida ekstra selular yang dihasilkan dari fermentasi dekstrosa oleh bakteri Xanthomonas campestris. Xanthan gum banyak digunakan dalam berbagai bidang industri sebagai stabilizer, pengental, dan pengemulsi. Dalam industri minyak, xanthan gum digunakan  untuk mengentalkan lumpur pengeboran dan membawa potongan padatan akibat pengeboran kembali ke permukaan. Proses fermentasi dilakukan pada biofermentor dimana substansinya diletakkan pada waktu bersamaan. Berdasarkan pengamatan, diperoleh xanthan gum pada komposisi limbah padat tapioka tertinggi 50 g / L dan urea 5 g / L. Optimasi dengan menggunakan Metode Permukaan Respon (RSM) dengan dua variabel yaitu limbah padat tapioka sebagai sumber karbon dan urea sebagai sumber nitrogen. Berdasarkan hasil perhitungan RSM, dapat disimpulkan bahwa setiap 16 jam respon maksimal mendekati titik pusat (0,0). Model memprediksi produksi xanthan gum optimal pada komposisi konsentrasi limbah padat tapioka sekitar 30 g / L dan urea 5 g / L. Hasil antara nilai prediksi dan nilai sebenarnya menunjukkan model dalam penelitian ini layak dan efektif. Hasil uji reologi menunjukkan karakteristik produk yang baik yang didukung oleh uji FTIR yang menunjukkan spektrum yang sama antara xanthan gum dengan xanthan gum komersial.
HOW ORGANIZATIONAL CULTURE AND DIGITAL TRANSFORMATIONAL LEADERSHIP AFFECT EMPLOYEE PERFORMANCE: A STUDY ON JOB SATISFACTION AS A MEDIATOR Wanda Novita; Sinta Oktavina; Siwi Putri Andini
International Journal of Social Science, Educational, Economics, Agriculture Research and Technology (IJSET) Vol. 5 No. 7 (2026): JUNE
Publisher : RADJA PUBLIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.21058061

Abstract

The evolving landscape of public sector human resource management demands that health service institutions continuously adapt their leadership approaches and organizational culture to sustain employee productivity. This study investigates the influence of organizational culture and digital transformational leadership on employee performance, with job satisfaction serving as a mediating variable, among employees of a public health service institution in Jakarta, Indonesia. Using a quantitative approach, data were collected from 345 respondents—comprising both permanent and contract employees—through a structured questionnaire employing a 1–5 Likert scale. Data analysis was conducted using Structural Equation Modelling (SEM) assisted by SmartPLS 4.0 software. The findings reveal that organizational culture and digital transformational leadership positively and significantly influence job satisfaction. Furthermore, job satisfaction and digital transformational leadership positively and significantly influence employee performance. However, organizational culture does not exert a direct significant effect on employee performance. Indirect path analysis confirms that job satisfaction fully mediates the relationship between organizational culture and employee performance, and partially mediates the relationship between digital transformational leadership and employee performance. These results underscore the critical role of job satisfaction as a mechanism through which culture and leadership shape performance outcomes in the public health sector
Co-Authors Akhmad Endang Zainal Hasan Aton Yulianto Ika Mulawati Purwanti Noviana Sinta Oktavina Wanda Novita