KINETIC STUDY OF DETERMINATION THE REACTION RATE OF VITAMIN C IN BROKOLI (Brassica oleracea L) USING TITRIMETRIC TITRATION METHOD / KAJIAN KINETIKA PENENTUAN LAJU REAKSI PENETAPAN KADAR VITAMIN C PADA BROKOLI (Brassica oleracea L) DENGAN METODE TITRASI TITRIMETRI

Background: The damage to broccoli is caused by several factors, namely mechanical and biological. The value of freshness in broccoli can be seen from the rate of respiration, which will affect on weight loss, texture, moisture content, color changes, vitamin C content or increased physiological and microbiological activity. Methods of studying the kinetics of vitamin C oxidation reaction can be carried out through literature values, distribution turnover, distribution abuse tests, consumer complaints, and accelerated shelf-life testing. The objective of the research was to determine the effect of vitamin C levels on the reaction rate equation in terms of expired date. Objective: To determine the effect of vitamin C levels on the reaction rate equation in terms of the expiry date. Methods: This study uses a cross-sectional method, namely making observations by collecting data that has been going on and reviewing the results of research that has been going on. Results: showed that broccoli at room temperature storage had the highest vitamin C content, namely 7,216 mg, at 10C ± 2ºC broccoli contained vitamin C levels of 5.045 mg, at 5Cº ± 2ºC broccoli contained vitamin C levels of 4.283 mg and at temperature 0Cº ± 2ºC broccoli contains vitamin C levels of 4.713 mg. Conclusion: The conclusion of this study is that there is a relationship between vitamin C levels and the reaction rate equation in terms of expired date, from the results of the study it was found that there were changes in the reaction rate in the zero order, first order and second order based on storage temperature, the order that most affected the reaction rate equation was in zero order because the value of zero order r2 is close to 1

Latar belakang: Kerusakan brokoli disebabkan oleh beberapa factor yaitu mekanis dan biologis. Nilai kesegaran pada brokoli bisa diketahui dari laju respirasi, yang akan mempengaruhi susut berat, tekstur, kadar air, perubahan warna, kandungan vitamin C atau aktifitas fisiologis maupun mikrobiologis semakin meningkat. Metode studi kinetika reaksi oksidasi vitamin C dapat dilakukan melalui literature value, distribution turn over, distribution abuse test, consumer complaints, dan accelerated shelf-life testing. Tujuan:  Mengetahui pengaruh kadar vitamin C terhadap persamaan laju reaksi ditinjau dari expired date. Metode: Penelitian ini menggunakan metode cross sectional yaitu melakukan pengamatan dengan pengambilan data yang sudah berlangsung dan melakukan telaah hasil dari penelitian yang telah berlangsung.
Hasil: Penelitian menunjukkan brokoli pada penyimpanan dengan suhu ruangan memiliki kadar vitamin C yang paling tinggi yaitu 7,216 mg, pada suhu 10Cº ± 2ºC brokoli mengandung kadar vitamin C sebesar 5,045 mg, pada suhu 5Cº ± 2ºC brokoli mengandung kadar vitamin C sebesar 4,283 mg dan pada suhu 0Cº ± 2ºC brokoli mengandung kadar vitamin C sebesar 4,713 mg. Kesimpulan: Kesimpulan penelitian ini adalah terdapat hubungan kadar vitamin C terhadap persamaan laju reaksi ditinjau dari expired date, dari hasil penelitian diperoleh bahwa terdapat perubahan laju reaksi pada orde nol, orde satu dan orde dua berdasarkan suhu penyimpanan, orde yang paling mempengaruhi persamaan laju reaksi berada pada orde nol karena nilai r2 orde nol mendekati 1.