ABSTRAK

ABSTRAK
Vitamin C atau disebut asam askorbat merupakan zat yang esensial diperlukan
setiap hari oleh tubuh. Vitamin C berperan sebagai antioksidan, membentuk
kolagen, dan menjaga kekebalan tubuh. Asam askorbat bisa didapatkan dari
makanan baik sayuran atau buah-buahan, salah satunya buah jeruk.
Penelitian yang dilakukan bersifat deskriptif eksperimental dengan mengukur
kadar vitamin C dalam buah jeruk jenis lokal dan impor, yaitu jeruk Keprok
Medan, Mandarin, Pontianak, Valencia (Sunkist) dengan metode titrasi iodometri.
Sampel yang digunakan berupa sari buah jeruk masing-masing dilakukan titrasi
sebanyak 3 kali ulangan. Hasil penelitian didapat dari rumus perhitungan titrasi
untuk konsentrasi standar dan sampel.
Hasil penelitian yang diperoleh menunjukkan rata-rata kadar vitamin C dalam
sampel jeruk, yang paling tinggi yaitu jeruk Mandarin dengan kadar vitamin C
31,82 %, jeruk Keprok Medan 15, 91 %, jeruk Pontianak dan Valencia 6,97 %.
Pencapaian kadar Vitamin C dibandingkan dengan kebutuhan vitamin C seharihari berdasarkan Angka Kecukupan Gizi (AKG). tertinggi pada jeruk Mandarin
yaitu 79,20 mg/250 ml, jeruk Keprok Medan 39,73 mg/250 ml, jeruk Pontianak
dan Valencia 14,41 mg/250 ml. Pencapaian kadar vitamin C dalam jumlah buah,
diantaranya; jeruk Keprok Medan sebanyak 3-6 buah per hari, Mandarin 3-6 buah,
Pontianak 4-9 buah per hari, Valencia 3-9 buah per hari, hasilnya bervariasi
tergantung jenis kelamin, usia, dll.
Kata kunci: Jeruk, Vitamin C, Titrasi Iodometri, Kebutuhan Sehari-hari
ABSTRACT
The vitamin C or ascorbic acid is a substance known as a very essential and
it’s needed by the human body every day. Vitamin C acts as an antioxidant,
collagen formation and maintain the immune system. Ascorbic acid must be
obtained from foods, not only vegetables but also fruits, one of them is orange.
This research used experimental descriptive methods by measuring the
vitamin C in citrus fruits, there’s local orange and imported orange; Medan
Tangerine, Mandarin, Pontianak, Valencia citrus. The research is performed by
Iodometric Titration method. The sample used from citrus juice, titration each
sample were performed three times replicated.
The results analysis can be calculated from outcome of formulated standard
and sample of vitamin C level. The results showed that the average of vitamin C
level in citrus samples, the highest is Mandarin citrus with vitamin C content of
31.82%, Medan Tangerine 15,91%, Pontianak and Valencia citrus is 6.9697%.
Attainments of Vitamin C level compared to daily necessities based on
Recommended Dietary Allowance (RDA) of vitamin C, the highest in the
Mandarin oranges is 79.20 mg/250 ml, Medan Tangerine is 39.73 mg/250ml,
Pontianak and Valencia citrus is 14.41 mg/250 ml. Attainment of vitamin C level
in the amount of fruit, such as; Medan Tangerine field approximately as much as
3-6 fruits per day, Mandarin is 3-6 fruits per day, Pontianak is 4-9 fruit per day,
Valencia is 3-9 fruits per day, the results vary depending on gender, age, etc.
Keywords: Citrus fruits, Vitamin C, Iodometric Titration, Daily Necessities