BAB I PENDAHULUAN
1.1 Latar Belakang Emulsi adalah suatu dispersi dimana fase terdispersi terdiri dari bulatan bulatan kecil zat cair yang terdistribusi ke seluruh pembawa yang tidak bercampur. Dalam batasan emulsi, fase terdispersi dianggap sebagai fase dalam dan medium dispersi sebagai fase luar atau fase kontinu. Emulsi yang mempunyai fase dalam minyak dan fase luar air disebut emulsi minyak – dalam – air dan biasanya diberi tanda sebagai emulsi “m/a”. Sebaliknya emulsi yang mempunyai fase dalam air dan fase luar minyak disebut emulsi air – air – dalam – dalam – minyak minyak dan dikenal sebagai emulsi “a/m”. Karena fase luar dari suatu emulsi bersifat kontinu, suatu emulsi minyak – dalam – air bisa diencerkan atau ditambah dengan air atau suatu preparat dalam air. Umumnya untuk membuat suatu emulsi yang stabil, perlu fase ketiga atau bagian ketiga dari emulsi, yakni: zat pengemulsi (emulsifying egent). Tergantung pada konstituennya, viskositas emulsi dapat sangat bervariasi dan emulsi farmasi bisa disiapkan sebagai cairan atau semisolid (setengah padat). Berdasarkan konstituen dan maksud pemakaiannya, emulsi cair bisa dipakai secara oral, topikal atau parenteral; emulsi semisolid digunakan secara topikal. Banyak preparat farmasi yang mungkin sebenarnya emulsi tidak digolongkan sebagai emulsi karena cocok untuk masuk dalam kategori sediaan farmasi lainnya yang lebih tepat. Misalnya, lotio – lotio tertentu, liniment, krim, salep, dan vitamin dalam bentuk tetes diperdagangan bisa jadi emulsi, tapi dikenal sebagai anggota dari golongan lain dari emulsi (Ansel, 2005 : 376). Parafin cair adalah campuran hidrokarbon yang diperoleh dari minyak mineral. Parafin cair adalah cairan kental, transparan, tidak berfluorensasi, tidak berwarna, hampir tidak berbau, hampir tidak mempynyai rasa. Parafin cair praktis tidak larut dalam air dan dalam etanol, larut dalam kloroform dan dalam eter. Parafin stabil meskipun dalam bentuk cair dan mungkin dapat terjadi perubahan secara fisik. Parafin cair dapat digunakan sebagai zat aktif untuk obat konstipasi yang berfungsi sebagai laksatif.
1
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Laksatif atau pencahar adalah makanan atau obat – obat – obatan obatan yang diminum untuk membantu mengatasi sembelit dengan membuat feses bergerak dengan mudah di usus. Dalam operasi pembedahan, obat ini juga diberikan kepada pasien untuk membersihkan usus sebelum operasi dilakukan. Laksatif merupakan obat bebas yang digunakan untuk mengatasi konstipasi atau sembelit. Konstipasi atau sembelit adalah kelainan pada sistem pencernaan yang mengakibatkan pengerasan feses yang berlebihan sehingga sulit untuk dibuang atau dikeluarkan dari tubuh dan dapat menyebabkan kesakitan yang hebat pada penderitanya.
1.2 Maksud dan Tujuan Percobaan Adapun maksud dan tujuan dari percobaan ini, yaitu: a. Mengetahui rancangan formula dalam pembuatan emulsi parafin cair. b. Memahami pembuatan sediaan emulsi parafin cair. c. Memahami evaluasi pada sediaan emulsi parafin cair.
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BAB II TINJAUAN PUSTAKA
2.1 Teori Umum 2.1.1 Definisi Sediaan Emulsi a. IMO hal 132 Emulsi adalah sediaan yang mengandung bahan obat cair atau obat,
terdispersi
dalam
cairan
pembawa,
distabilkan
larutan dengan
zat
pengemulsi atau surfaktan yang cocok. b. FI III : 9 Emulsi
adalah
sediaan
yang
mengandung
bahan
obat
air
atau
distabilkan dengan zat pengemulsi atau surfaktan yang cocok. c. FI IV : 6 Emulsi adalah sistem dua fase dimana salah satu cairannya terdispersi dalam cairan yang lain dalam bentuk tetesan-tetesan kecil. d. RPS 18 th : 298 Emulsi adalah suatu sistem terdispersi yang terdiri dari paling sedikit 2 fase cairan yang tidak saling bercampur e. Lachman : 1029 Emulsi adalah suatu campuran yang tidak stabil secara termodinamika yang terdiri dari 2 cairan yang tidak saling ber campur f. Parrot : 354 Emulsi adalah suatu sistem polifase dari 2 campuran yang tidak saling bercampur.Salah
satunya
dengan bantuan emulgator keseluruh
tersuspensi partikel
lainnya.
secara
termodinamika
Ukuran diameter partikelnya partikelnya 0.2 – 0.2 – 50 50 m. g. Physical Phar. : 522 Emulsi
adalah
sistem
yamg
tidak
stabil
mengandung paling sedikit 2 fase cair yang tidak bercampur satu diantaranya terdispersi sebagai globul-globul (fase pendispersi) dalam
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h. Scoville’s :314 Emulsi yang digunakan digunakan dalam farmasi adalah sediaan yang yang mengandung 2 cairan yang tidak bercampur, satu diantaranya
terdispersi
secara
seragam sebagai globul i.
Ansel : 376
Emulsi adalah suatu dispersi dimana fase terdispersi terdiri dari bulatan-bulatan kecil zat cair yang terdistribusi ke seluruh pembawa yang tidak saling bercampur. j.
Encyclopedia : 138
Umumnya digambarkan sebagai sistem heterogen, terdiri dari dua cairan yang tidak bercampur. Satu diantaranya didispersikan secara seragam sebagai tetesan kecil dalam cairan lain. 2.1.2 Tujuan Pemakaian Emulsi a. Untuk dipergunakan sebagai obat dalam atau per oral. Umumnya tipe emulsi tipe O/W. b. Untuk dipergunakan sebagai obat luar. Bisa tipe O/W maupun W/O, tergantung pada banyak faktor, misalnya sifat atau efek terapi yang dikehendaki. (Syamsuni, 129). 2.1.3 Macam-Macam Emulsi Berdasarkan penggunaannya emulsi dibagi menjadi 2 golongan, yaitu : 1. Emulsi penggunaan per-oral
Emulsi minyak dalam air Biasanya mempunyai tipe minyak dalam air. Emulgator merupakan
film penutup dari minyak obatnya untuk menutupi rasa tidak enak, zat perasa diberikan diberikan pada fase ekstern untuk memberikan rasa enak. 2. Emulsi untuk injeksi itravena Emulsi parenteral telah diselidiki untuk penggunaan makanan dan minyak obat untuk hewan dan manusia. Penggunaan emulsi parenterol meminta perhatian khusus selama produksi seperti pemilihan emulgator
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Baik bentuk minyak dalam air atau air dalam minyak yang dapat dipakai untuk pemakaian kulit dan memoran mukosa dengan proses emulsi kemungkinan terbentuk lotion atau cream yang karsistensinya mempunyai sifat-sifat :
Dapat meluas daerah yang diobati
Dapat mudah dicuci
Tidak membekas pada pakaian
Memiliki bentuk ,bau, warna dan rasa yang baik
2.1.4 Syarat-Syarat Sediaan Emulsi Sediaan emulsi dapat terbentuk jika :
Terdapat 2 zat yang tidak saling melarutkan
Terjadi proses pengadukan (agitosi)
Terdapat emulgator Sediaan emulsi yang baik adalah sediaan emulsi yang stabil,
dikatakan stabil apabila sediaan emulsi tersebut dapat mempertahankan distribusi yang teratur dari fase terdispersi dalam jangka waktu yang lama. (R. Voight hal 434) 2.1.5 Komposisi Sediaan Emulsi Sediaan emulsi secara umum terdiri dari bahan aktif dan juga tambahan a. Bahan aktif antara lain :
Paraffin cair
Oleum iecoris aselli
Curaubitae semin
b. Bahan tambahan antara lain : Emulgator menstabilkan dengan cara menempati antara permukaan antara tetesan minyak dan air. Emulgator juga mengurangi tegangan antar muka antara fase sehingga meningkatakan proses emulsifikasi selama pencampuran.
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2. Merah telur Merah telur digerus dalam mortar dengan 3ml air dan kemudian ditambahkan sedikit-sedikit minyaknya. Setelah diencerkan disraing dengan air kas. 3. Tragakan Mula-mula tragakan digerus dengan air yang 20 kali banyaknya, kepada mucilago ini ditambahkan bergantian sejumlah kecil minyak dan air, sangatlah perlu menamabahkan minyak dalam jumlah lebih kecil. 1 gram tragakan = 10 gram gom arab. 4. Carboxymethyloellulose (CMC) Larutannya dibuat dengan jalan menuangi zat dengan air didih dan membiarkannya beberapa c. Pengawet antimikroba /preserudife Sediaan emulsi memerlukan bahan antimikroba karena fase air memepermudah pertumbuhan mikroorganisme. Sehingga fungsi dari pengawet
antimikroba
yaitu
dapat
mengurangi
kortaminasi
mikroorganisme. Contoh pengawet :
Asam benzoat
Metil paraben (nipagin)=0,015-0,
Prophylparaben (nipasol)=0,01-0,02%
d. Antioksidan Diperlukan untuk mencegah terjadinya kekeringan dari fase minyak ataupun oksidasi zat berkhasiat. Contoh :
Asam askorbat
Asam sitrat
Askorbil
Sulfit
e. Pembau (corigen adoris) Zat pembau ditambahkan agar menutupi bau dari zat aktifnya yang
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Oleum ricini
Oleum cinamommi
Vanillium
f. Pewarna (corigen colori) Zat pewarna ditambahkan agar menutupi penampilan yang tidak menarik. Contoh
Eritrosin
Tartrozin
Roosberry red
g. Perasa (corigen saporis) Zat perasa ditambahkan agar menutupi rasa dari minyak, sehingga dapat menarik bagi anak-anak. Contoh
Gliserin : >20%
Sukrosa : 67%
2.1.6 Metode Pembuatan Emulsi a. Metode Gom Kering (Metode Kontinental) Pada Metode Gom kering atau yang biasa dikenal dengan nama metode “4:2:1”, formula yang digunakan untuk membuat corpus emulsi adalah 4 bagian minyak, 4 bagian air, dan 4 bagian gom (atau emulgator). Sedangkan pada metode Kontinental, formulanya adalah “4:3:2”. Setelah corpus emulsi ini terbentuk, bahan – bahan – bahan bahan formulatif cair lainnya yang larut dalam fase luar, ditambahkan sedikit demi sedikit sambil terus
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minyak perlahan-lahan ditambahkan untuk membentuk emulsi, kemudiaan diencerkan denganm sisa air. c. Metode Botol Forbes Metode ini cocok untuk pembuatan emulsi yang berisi minyak – minyak menguap dan mempunyai viskositas rendah. Serbuk gom dimasukkan ke botol kering, tambah 2 bagian air dan dikocok kuat dalam keadaan botol tertutup rapat. Tambahkan minyak dan air secara bergantian sedikit demi sedikit sambil terus dikocok setiap kali dilakukan penambahan air dan minyak. Metode ini kurang cocok untuk minyak kental karena viskositasnya yang terlalu tinggi sehingga sulit untuk dikocok dan dicampur dengan gom dalam botol. 2.1.7 Bentuk Kerusakan Emulsi
Gambar 1. Perubahan stabilit as emulsi. (1) Emulsi segar , (2) Flokulasi, (3) koalesen, (4) creaming, (5) Ostwald ripening, (6) inversi fase
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terdispersi tersebut saling berdekatan. Hal ini dapat diatasi juga dengan pengocokan, namun untuk untuk mencegah terjadinya pelekatan yang kuat, maka ditambahkan koloid pelindung (musilago) untuk melindungi permukaan tetes terdispersi tersebut, jadi akan mudah terlepas saat dikocok. c. Oswald Ripening Merupakan
suatu
jalan
untuk
menuju
ke
sebuah
koalesens
(penggabungan tetes terdispersi). d. Koalesens Merupakan suatu bentuk kerusakan yang diakibatkan oleh kurangnya surfaktan yang digunakan, sehingga lapisan pelindung pada permukaan tetesan lemah. Jadi tetesan tersebut akan berfusi (bergabung) membentuk suatu tetesan yang berdiameter lebih besar. Kerusakan ini bersifat irreversibel dan akan menyebabkan terjadinya pemisahan fase (cracking). e. Inversi fase Kerusakan ini terjadi karena volume fase terdispersi hampir sama jumlahnya dengan fase pendispersi sehingga terjadi perubahan tipe dari o/w menjadi w/o atau sebaliknya. 2.1.8 Cara Menentukan Emulsi Menurut DOM 509 Beberapa metode tersedia untuk menentukan tipe emulsi. Beberapa metode paling umum meliputi pengenceran tetesan, kelarutan cat, pembentukan creaming, konduktivitas konduktivitas listrik, dan tes fluoresensi. a) Tes Pengenceran Tetesan
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cepat mewarnai emulsi M/A tapi tidak mewarnai emulsi tipe A/M. Sudan III, cat larut minyak dengan cepat mewarnai emulsi A/M, tidak tipe M/A. c) Uji Arah Creaming Creaming adalah fenomena antara 2 emulsi yang terpisah dari cairan aslinya dimana salah satunya mengapung pada permukaan lainnya. Konsentrasi fase terdispersi adalah lebih tinggi dalam emulsi yang terpisah. Jika berat jenis relatif tinggi dari kedua fase diketahui, maka arah creaming dari fase terdispersi menunjukkan adanya tipe emulsi M/A. jika cream emulsi menuju ke bawah berarti emulsi A/M. hal ini berdasarkan asumsi bahwa mimyak kurang padat daripada air. d) Uji Hantaran Listrik Uji
hantaran
listrik
berdasarkan
pada
prinsip
bahwa
air
menghantarkan arus listrik sedangkan minyak tidak. Jika elektrode ditempatkan pada emulsi menghantarkan artus listrik, maka emulsi M/A. jika sistem tidak menghantarkan arus listrik, maka emulsi adalah A/M. e) Tes Fluoresensi Banyak minyak jika dipaparkan pada sinar UV berfluoresensi, jika tetesan emulsi dibentangkan dalam lampu fluoresensi di bawah mikroskop dan semuanya berfluoresensi, menunjukkan emulsi A/M. Tapi jika emulsi M/A, fluoresensinya berbintik-bintik. 2.1.9 Kelebihan dan Kekurangan Emulsi Keuntungan emulsi
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Kerugian emulsi
Sulit diformulasikan karena harus mencampur 2 fase yang tidak tercampurkan.
Mudah ditumbuhi oleh mikroba karena adanya air.
Kestabilan fisika dan kimia terjamin dalam waktu lama.
b. Menurut Ansel Keuntungan
Menurut eleganti tertentu dan mudah dicuci.
Dapat mengontrol penampilan, viskositas dan derajat kekasaran dari emulsi.
Sebagian besar lemak dan pelarut untuk lemak yang dimasukkan untuk pemakaian ke dalam tubuh manusia, relatif memakan biaya, akibatnya pengenceran yang aman dan tidak mahal.
Kerugian
Emulsi merupakan suatu campuran yang tidak stabil secara termodinamika.
Jika pengocokan ditentukan, tetesan akan bergabung ber gabung menjadi satu dengan cepat.
Biasanya hanya satu fase yang bertahan dalam bentuk tetesan.
2.1.10 Faktor - Faktor Yang Yang Dapat Mempengaruhi Stabilitas Fisika Sediaan Emulsi 1. Ukuran fase terdispersi/dalam suatu emulsi stabil, jika butir yang
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4. Viskositas fase luar makin besar viskositas emulsi , maka makin kurang gerakan/tumbukan butir-butir fase dalam, dengan demikian menghalangi bersatunya fase dalam dan menghindari terjadinya creaming. 2.1.11 Pemakaian Sediaan Emulsi Sediaan emulsi dapat dipergunakan untuk obat dalam maupun obat luar. Untuk obat obat dalam, lebih disukai emulsi tipe m/a karena rasa atau bau minyak yang tidak enak dapat tertutup/dikurangi. Minyak dalam butirbutir halus lebih mudah dicerna. Contoh : emulsi minyak ikan.
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2.2 Teori Khusus 2.2.1 Efek Farmakologi Paraffin Liquid Ditinjau dari aspek farmakologi, Paraffin Liquid digunakan sebagai zat aktif untuk obat konstipasi yang bertindak sebagai laksatif emolien/lubrikan. Laksatif emolien bekerja dengan cara melapisi feses dan memberikan efek licin sehingga mempermudah jalannya feses. Selain itu paraffin liquid juga menempel di dinding kolon dan memberikan efek hidrofobik yang menghambat penyerapan air di kolon sehingga massa feses menjadi lebih besar. Zat aktif ini bekerja lokal di kolon dan tidak perlu di absorbi. Apabila diabsorbsi sedikit, paraffin liquid memiliki efek samping reaksi granulomatosa. Efek samping lainnya adalah pneumonia lipoid dan gangguan absorbs vitamin larut lemak. Ditinjau dari aspek farmasetis, paraffin liquid biasa digunakan sebagai fase minyak/pembawa dalam emulsi, baik sediaan semisolid maupun cair. Dalam hal ini, paraffin liquid bekerja sebagai pelarut senyawa-senyawa yang larut dalam minyak lemak. 2.2.2 Uraian Bahan
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Nama Lain
:Gom Akasia, Gom arab
Nama Kimia
:-
Rumus Molekul
:-
Berat Molekul
:-
Pemerian
: Hampir tidak berbau, rasa tawar seperti lendir
Kelarutan
: Mudah larut dalam air, menghasilkan larutan yang kental dan tembus cahaya. Praktis tidak larut dalam etanol (95%)
Khasiat/Kegunaan
: Zat tambahan
Penyimpanan
: Dalam wadah tertutup baik
Inkompabilitas
:Akasia tidak bercampur dengan sejumlah zat termasuk amidopyrine, apomorphine, kresol, etanol (95%), garam besi, morfin, fenol, physostigmine, tanin, timol, dan vanili. Adanya enzim pengoksidasi dapat mempengaruhi stabilitas zat. Namun, enzim
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Nama lain
: Tween 60
Pemerian
: Cairan kental seperti minyak, jernih kuning, bau karakteristik dari asam lemak
Kelarutan
: Mudah larut dalam air, dalam etanol 95 % P,dalam etanol P, sukar larut dalam parafin cair P dan dalam minyak biji kapas P.
Peyimpanan
: Dalam wadah tertutup baik
Kegunaan
: Sebagai emulgator tipe air
Inkompabilitas
: Perubahan warna dan pengendapan terjadi dengan berbagai zat, khususnya fenol, tanin, tar, dan bir seperti metanial. Aktivitas berkurang dengan adanya antimikroba antimikroba pengawet paraben. (Rowe,551).
e. Na CMC Nama resmi
:NATRII CARBOXY METHYL METHYL CELULOSUM
Nama lain
: Natrium karbon krimetil sellulosa
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Pemerian
: Cairan jernih, tidak berbau. Tidak berwarna, tidak mempunyai rasa
Khasiat/kegunaan
:Zat tambahan
Penyimpanan
: Dalam wadah tertutup baik
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BAB III METODE PERCOBAAN
3.1 Formula I.
Formula Asli Paraffinum Liquidum
II.
Rancangan Formula a. Metode Korpus Emulsi Basah Parafin cair
30%
PGA
10%
Na CMC
0,05%
Aquadest
ad 100 ml
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PT.AKFATOR FARMA Dosis No
Kode Bahan
Nama Bahan
Fungsi Bahan
Perbotol
Perbotol
(metode korpus
(metode korpus
emulsi basah)
emulsi kering)
01
01 – 01 – PL PL
Parafin cair
Zat aktif
30 ml
30 ml
02
02 – 02 – PGA PGA
Pulvis Gummi Arabicum
Emulgator
10 g
10 g
03
03 – 03 – TW TW
Tween 60
Emulgator
-
2,15 g
04
04 SP
Span 60
Emulgator
0,85 g
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V.
Alasan Penggunaan Bahan 1. Zat Aktif
: Parafin cair
Ditinjau dari aspek farmakologi, parafin cair digunakan sebagai zat aktif untuk obat konstipasi yang bertindak sebagai laksatif emolien / lubrikan. Laksatif emolien bekerja dengan cara melapisi feses dan memberikan efek hidrofobik yang menghambat penyerapan air di kolon sehingga massa feses menjadi lebih l ebih besar. Zat aktif ini bekerja lokal di kolon dan tidak perlu diabsorpsi. Ditinjau dari aspek farmasetis, parafin cair biasa digunakan sebagai fase minyak / pembawa dalam sistem emulsi, baik sediaan
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1985). Sebagai pengental, Na CMC mampu mengikat air sehingga molekul – molekul air terperangkap dalam struktur gel yang dibentuk oleh Na CMC (Manife, 1989). Cara melarutkan Na CMC yang baik adalah dengan cara ditaburkan di dalam air dingin dan dibiarkan beberapa jam, lalu diaduk perlahan – perlahan – lahan lahan sampai larut. Atau diaduk kuat – kuat kuat dengan pengaduk cepat (mixer) (IMO, 2010 : 140). b. Aquadest Air murni diperoleh dengan penyulingan, cara pertukaran ion, osmosis terbalik atau cara lain yang sesuai. Air murni ini dibuat dari air yang memenuhi persyaratan Perwakilan
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Zat – zat pembasah, yang bersifat kationik, anionik, dan non-ionik. Zat – zat zat ini mengandung gugus – gugus gugus hidrofilik dan
lipofilik,
dengan
bagian
lipofilik
dari
molekul
menyebabkan aktivitas permukaan dari molekul tersebut (Ansel, 2005 : 380). Tween 60 dan Span 60 merupakan zat pengemulsi nonionik. Zat pengemulsi non-ionik menunjukkan tidak adanya kecenderungan untuk mengion. Tergantung pada sifatnya masing – masing, beberapa dari grup ini membentuk emulsi m/a dan lainnya membentuk emulsi a/m. Harga HLB untuk pengemulsi Tween 60 (Polioksietilen sorbitan monostearat)
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0,05
Na CMC
=
Aquadest
= ad 100 ml
Perhitungan HLB
100
x 100 ml = 0,05 g = 50 mg
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stamper, batang pengaduk, beaker glass, tabung reaksi, pipet tetes, timbangan, sendok tanduk, corong dan erlenmeyer. Bahan yang digunakan dalam praktikum ini antara lain parafin cair, PGA, Na CMC, emulgator tween 60 dan span 60, aquadest, kertas saring, aluminium foil, dan tisu.
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7. Ditambahkan aquadest sampai 100 ml. IX. Evaluasi a. pH Korpus kering
= pH 4 (asam)
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- Dengan tetesan a) Korpus kering : Cepat tersebar (m/a) b) Korpus basah : Cepat tersebar (m/a) 4) Metode pewarnaan Pewarna larut dalam air (Metilen Blue)
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