TEH HIJAU DAN KHASIATNYA BAGI KESEHATAN TUBUH
Diajukan sebagai salah satu syarat mengikuti ujian nasional
Oleh Muhammad Bakhtiar 050610034
SMA DWIWARNA ( BOARDING BOARDING SCHOOL ) JALAN RAYA PARUNG KM. 40 BOGOR
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2007
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LEMBAR PENGESAHAN
Karya Tulis Ilmiah ini disahkan pada tanggal ............................................................
Oleh
Guru Penguji
Guru Pembimbing
Iryanto Yossa
Ir. Widiati S.
Mengetahui,
Direktur SMA Dwiwarna
Dr. dr. Carmen Jahja, SportMed
Wakakur SMA Dwiwarna
Euis Tresna, S.Pd. MSi.
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ABSTRAK
Teh merupakan minuman hasil olahan daun teh yang sering kita jumpai di dataran dataran tinggi. tinggi. Berdasarkan Berdasarkan proses pengolahan pengolahannya, nya, teh dibagi dibagi menjadi menjadi tiga yaitu teh hijau (tidak difermentas difermentasikan), ikan), teh oolong oolong (semiferment (semifermentasi), asi), dan teh hitam (fermentasi penuh). Teh sebagai salah satu minuman populer di kalangan masyarakat memiliki berbagai berbagai manfaat. Di samping samping sebagai sebagai pelepas pelepas dahaga, dahaga, beberapa beberapa penelitian penelitian telah membuk membuktika tikan n bahwa bahwa teh memilik memilikii banyak banyak khasia khasiatt dalam dalam dunia dunia keseha kesehatan tan.. Di antara antara ketiga ketiga jenis jenis teh yang ada saat ini, ini, teh hijaulah hijaulah yang yang paling paling dipercay dipercayaa mampu mampu mengat mengatasi asi berbag berbagai ai masalah masalah keseha kesehatan tan.. Hal ini diseba disebabka bkan n teh hijau hijau memiliki kandungan katekin paling tinggi dibandingkan jenis teh lainnya. Di antara antara banyak banyaknya nya senyaw senyawaa kimia kimia yang yang terdapa terdapatt di dalam dalam daun daun teh, teh, kateki katekin n merup merupaka akan n senyaw senyawaa paling paling pentin penting. g. Sebab, Sebab, selain selain berfun berfungsi gsi sebaga sebagaii pem pembe beri ri rasa rasa,, warn warna, a, dan dan aroma aroma pada pada teh, teh, kate kateki kin n juga juga berf berfun ungs gsii seba sebaga gaii antioksidan serta pencegah berbagai jenis penyakit. Di tengah tengah-ten -tengah gah perkem perkemban bangan gan indust industri ri yang yang mening meningkat kat pesat pesat saat saat ini, ini, ancaman terserang berbagai penyakit pun semakin besar, mulai dari penyakit yang tergolong ringan seperti influenza, hingga penyakit serius seperti kanker. Oleh karena karena itu, itu, dibutu dibutuhka hkan n senyaw senyawaa yang yang mampu mampu menceg mencegah ah penyak penyakit-p it-peny enyaki akitt ters terseb ebut ut.. Sala Salah h satu satu seny senyaw awaa yang yang memb memberi erika kan n harap harapan an besa besarr bagi bagi duni duniaa kesehatan ialah senyawa katekin (polifenol) yang terdapat pada teh, khususnya teh
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Berdasa Berdasarka rkan n hasil hasil peneli penelitia tian n yang yang dilaku dilakukan kan oleh oleh para para ahli ahli di sejuml sejumlah ah nega negara, ra, kate kateki kin n pada pada teh teh hija hijau u terbu terbukt ktii mamp mampu u meng mengha hamb mbat at radik radikal al beba bebass penyebab kanker. Di samping itu, katekin teh hijau pun mampu mengurangi risiko seseor seseorang ang untuk untuk mengal mengalami ami serang serangan an jantun jantung, g, melanc melancarka arkan n sekres sekresii air seni, seni, meningkatkan kekebalan tubuh, mencegah karies pada gigi, dan sebagainya. Uraian lebih lanjut mengenai khasiat teh hijau bagi kesehatan tubuh kita terdapat pada bab II dari karya tulis ini.
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KATA PENGANTAR
Assalamu’alaikum Wr. Wb. Segala puji hanya bagi Allah SWT. karena dengan rahmat dan izin-Nya Karya Tulis Ilmiah ini dapat terselesaikan. Shalawat dan salam semoga tercurah kepa kepada da junj junjun unga gan n kita kita,, Nabi Nabi Muha Muhamm mmad ad SAW, SAW, bese besert rtaa kelu keluarg argaa dan dan para para sahaba sahabatny tnya. a. Semoga Semoga curaha curahan n rahmat rahmatnya nya akan akan sampai sampai kepada kepada kita kita sekalia sekalian. n. Amin… . Hingga saat ini persentase pengetahuan masyarakat akan khasiat teh dalam dunia kesehatan masih tergolong rendah. Banyak masyarakat yang suka meminum teh hanya karena merasa senang dan gemar terhadap minuman ini. Oleh karena itu, penulis berharap penyusunan karya tulis ini dapat memberikan informasi akan hal tersebut. Karya tulis ini tak mungkin dapat terselesaikan tanpa bantuan dan dukungan dari berbagai pihak. Oleh sebab itu, pada kesempatan ini penulis bermaksud mengucapkan terima kasih yang sebesar-besarnya kepada kedua orang tua penulis yang tak henti-hentinya mengingatkan agar karya tulis ini segera diselesaikan, Ir. Widiati S. selaku guru pembimbing, Bapak dan Ibu guru penanggung jawab KTI yang setia menunggu hingga karya tulis ini rampung, pihak Server/IT yang selalu bersedia meminjamkan laboratorium komputer untuk pengetikan, para pembina asrama, teman-teman sekelas maupun seluruh angkatan 8 serta tanpa mengurangi rasa hormat dan terima kasih kepada pihak lain yang namanya tak dapat dituliskan
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Sebagaimana kata pepatah, tiada gading yang tak retak, tiada manusia yang
sempurna, begitu pula dengan karya tulis ini. Maka dari itu, penulis memohon maaf yang sebesar-besarnya apabila dalam karya tulis ini terdapat banyak kesalahan dan kekurangan meskipun penulis telah berupaya semaksimal mungkin untuk memuaskan pembaca. Akhir kata, semoga segala sesuatu yang diharapkan penulis dari penyusunan karya tulis ini dapat tercapai. Amin Ya Rabbal ‘Alamin... . Wassalamu’alaikum Wr. Wb.
Bogor, Maret 2007
Penulis
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DAFTAR ISI HALAMAN HALAMAN JUDUL..... JUDUL.......... .......... .......... .......... .......... .......... .......... .......... .......... ......... ......... ............... ..................... ............. ..
i
LEMBAR LEMBAR PENGESAHAN PENGESAHAN..... .......... .......... .......... .......... .......... .......... ......... ......... ............. .................... ................... ....... ii ABSTRAK................................ ABSTRAK....................................................... ............................................................... ........................................... ... iii KATA PENGANTAR............................. PENGANTAR.................................................... ................................................... ............................ v DAFTAR ISI................................. ISI........................................................ .............................................. ....................................... ................ vii DAFTAR TABEL.................................................. TABEL......................................................................... ................................... .............viii .viii DAFTAR GAMBAR............................... GAMBAR...................................................... ................................................... ............................ ix BAB I
PENDAH PENDAHULU ULUAN. AN.... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ...... ..... .. 1
1.1 Latar Belakang... Belakang........ .......... .......... ......... ......... .......... .......... .......... .......... .......... .............. .................... ........... 1 1.2 Rumusan Rumusan Masalah... Masalah........ .......... .......... .......... .......... .......... .......... .......... .......... ........... ................. ............. .. 2 1.3 Tujuan.... Tujuan......... .......... .......... .......... .......... .......... .......... .......... .......... ......... ......... ............. .................... ................... ....... 2 1.4 Manfaat..... Manfaat.......... .......... .......... .......... .......... .......... .......... .......... .......... .......... ............. ................... .................... ......... 3 BAB II PELAKS PELAKSANA ANAAN AN PENELI PENELITIA TIAN.. N..... ...... ...... ...... ...... ...... ....... ........ ........ ........ ........ ........ ...... .. 4
2.1 Kajian Pustaka.. Pustaka....... .......... .......... .......... .......... .......... .......... .......... .......... .......... .......... .......... .......... ........... ...... 4 2.1.1 2.1.1 Pengertian Pengertian Teh Teh dan Pengklas Pengklasifikas ifikasianny iannya..... a.......... ................ ........... 4 2.1.2 2.1.2 Kandunga Kandungan n Kimia Kimia pada Daun Daun Teh... Teh........ .......... ............. ................... ........... 6
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DAFTAR TABEL
Tabel 1
Komposisi Komposisi Pucuk Pucuk Daun Teh Teh (% berat kering)..... kering).......... .......... .......... ............ .................. .................. ....... 6
Tabel 2
Sifat Fisik dan Kimia Katekin.... Katekin........ ......... .......... .......... .......... .......... .......... .......... .......... .......... .......... .......... ............ ....... 8
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DAFTAR GAMBAR
Gambar 1
Teh hijau, hijau, dibuat melalui melalui inaktivasi inaktivasi enzim polifenol... polifenol........ .......... .......... .......... .......... ............ ....... 4
Gambar 2
Teh hitam, hitam, memiliki memiliki warna warna merah merah keemasan keemasan atau kecokl kecoklatan.... atan.................... ................ 5
Gambar 3
Teh oolon oolong, g, diprose diprosess melalui melalui pemanas pemanasan an daun daun dalam dalam waktu waktu singka singkat........ t........ . 5
Gambar 4
Pucuk daun daun teh, paling kaya kandunga kandungan n katekin galatnya.. galatnya....... .......... .......... .......... .......... ..... 7 Gambar 5
Struktur polifenol....................................... polifenol.............................................................. ............................................... ........................ ... 8
Gambar 6
Teh memiliki khasiat khasiat penting bagi bagi kesehatan tubuh................... tubuh.................................... ................. 13
Gambar 7
Kank Kanker er payu payuda dara ra,, sala salah h satu satu peny penyak akit it yang yang dapa dapatt diceg dicegah ah deng dengan an mengonsumsi te h hijau ....................................................................................................................
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Gambar 10
Osteoporosis, penyakit yang sering diderita oleh seseorang yang telah lanjut usia .................................................................................................................... .................................................................................................................... 29
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BAB I PENDAHULUAN 1.1 Latar Latar Belakan Belakang g
Di era yang yang sema semaki kin n maju maju sepe seperti rti saat saat ini, ini, terda terdapa patt berb berbag agai ai jeni jeniss minuman yang biasa dikonsumsi oleh masyarakat dalam kehidupan seharihari. Namun sebagian besar dari minuman-minuman tersebut tidak memiliki manf manfaa aatt bagi bagi kese keseha hata tan n tubu tubuh h kita kita,, bahk bahkan an tida tidak k sedi sediki kitt yang yang bisa bisa menimbulkan penyakit. Hal ini disebabkan oleh zat-zat kimia yang terkandung dalam minuman tersebut. Sangat sedikit orang yang menyadari akan dampak yang dihasilkan oleh minu minuma man n yang yang diko dikons nsum umsi siny nya. a. Terle Terlebi bih h lagi lagi bany banyak ak minu minuma man n yang yang menggunakan bahan pewarna dan bahan pengawet yang bisa membahayakan keseha kesehatan tan kita. kita. Oleh Oleh karena karenanya nya kita kita harus harus bisa bisa membia membiasak sakan an diri diri untuk untuk
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senyawa kimia potensial yang terkandung di dalam daun teh serta peranannya bagi dunia kesehatan dan pengobatan. Di samping itu, tak bisa kita pungkiri bah bahwa wa juml jumlah ah masy masyara araka katt yang yang gema gemarr meng mengon onsu sums msii teh teh hija hijau u masi masih h tergolong sedikit, khususnya di Indonesia. Berdas Berdasark arkan an kondis kondisi-k i-kond ondisi isi terseb tersebut, ut, tercetu tercetusla slah h sebuah sebuah ide untuk untuk menyusun karya tulis ini agar dapat memberikan informasi mengenai senyawa kimia yang terkandung dalam teh hijau serta khasiatnya bagi kesehatan tubuh kita. 1.2 Rumusan Rumusan Masalah Masalah
Berdasarkan latar belakang di atas, maka permasalahan-permasalahan yang akan dibahas dalam karya tulis ini adalah : a.
Apa Apa penge pengert rtian ian teh teh,, dan bag bagai aima mana naka kah h pengk pengkla lasi sifi fika kasi sian anny nya? a?
b
Apa Apa saja saja sen senya yawa wa kim kimia ia yan yang g terk terkan andu dung ng di di dala dalam m daun daun teh? teh?
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jen jenis is teh, teh, yait yaitu u teh teh hija hijau u bese besert rtaa kand kandun unga gan n seny senyaw awaa kimi kimiaa pent pentin ing g di dalamnya. Adapu Adapun n tujuan tujuan dari dari penyus penyusuna unan n karya karya tulis tulis ini bagi bagi pribad pribadii penuli penuliss adalah sebagai salah satu syarat untuk mengikuti Ujian Akhir Nasional di SMA Dwiwarna. 1.4 Manfa Manfaat at
Dengan adanya penulisan karya tulis ini diharapakan dapat memberikan manfaat bagi para pembaca. Di antaranya adalah pembaca bisa memperoleh informasi seputar teh hijau dan manfaatnya bagi kesehatan. Selain itu bisa menu menumb mbuh uhka kan n
kesa kesada daran ran pemb pembaca aca khus khusus usny nya, a, dan dan
masy masyar arak akat at
pada pada
umumnya, umumnya, untuk untuk mencari mencari tahu kandungankandungan-kandu kandungan ngan yang terdapat dalam setiap makanan maupun minuman yang dikonsumsi, apakah berdampak baik atau buruk bagi kesehatan tubuh.
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BAB II PELAKSANAAN PENELITIAN 2.1 Kajian Pustaka 2.1.1 Pengertian Teh dan Pengklasifikasiannya Pengklasifikasiannya
Teh merupakan merupakan salah satu bahan minuman yang terkenal terkenal di dunia setelah air. Bahan minuman ini diperoleh dari hasil pengolahan daun teh yang tumbuh di daerah dataran tinggi. Berdasarkan hasil dan proses pengolahannya, teh dikelompokkan dala dalam m tiga tiga jeni jenis, s, yait yaitu u teh teh hija hijau u (tida (tidak k difer diferme ment ntas asi) i),, teh teh oolo oolong ng (semifermentasi), dan teh hitam (fermentasi penuh). Teh Teh hija hijau u dibu dibuat at mela melalu luii meto metode de inak inakti tiva vasi si enzi enzim m poli polife feno noll oksidasenya di dalam daun teh segar. Metode ini dapat dilakukan melaui pemanasan pemanasan (udara panas) panas) dan penguapan ( steam /uap air). Kedua proses
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kateki katekin n teh diubah diubah menjad menjadii moleku molekull yang yang lebih lebih komple kompleks ks dan pekat pekat sehingga memberi ciri khas teh hitam, yaitu berwarna, kuat, dan berasa tajam.
Gambar 2.
Teh hitam, memiliki warna merah keemasan atau kecoklatan
Teh oolong diproses melalui pemanasan daun dalam waktu singkat setela setelah h penggu penggulun lungan gan.. Oksida Oksidasi si terhent terhentii dalam dalam proses proses pemana pemanasan san,, sehingga teh oolong disebut dengan teh semifermentasi. Karakteristik
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yang menyebabkan teh hijau dinilai memiliki khasiat paling baik bagi kesehatan dibandingkan dengan kedua jenis teh lainnya. 2.1.2 Kandungan Kimia pada Daun Teh
Daun teh sebagai bahan utama dalam pembuatan minuman (teh) tentu mengandung mengandung berbagai jenis senyawa senyawa kimia di dalamnya. dalamnya. Vakuola Vakuola dalam sel daun teh mengandung zat-zat yang larut dalam air, seperti katekin, kafein, aneka asam amino, dan berbagai gula. Dalam sitoplasma terdap terdapat at enzim enzim pengok pengoksid sida, a, yaitu yaitu polife polifenol nol oksid oksidase ase,, klorof klorofil, il, dan
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pen penye yeba bab b arom aroma, a, dan dan enzi enzim. m. Keem Keempa patt kelo kelomp mpok ok ters terseb ebut ut yang yang menimbulkan berbagai macam sifat yang dapat kita temukan pada teh. A. Su Subs bsta tans nsii Fenol Fenol
Subs Substan tansi si ini ini hany hanyaa terd terdir irii dari dari dua dua seny senyaw awaa kimi kimia, a, yait yaitu u katekin (polifenol) dan flavanol. a.
Katekin (Polifenol)
Katekin (polifenol) teh berbeda dengan katekin pada tanaman lain lain.. Kate Kateki kin n dala dalam m teh teh tida tidak k bers bersif ifat at meny menyam amak ak dan dan tida tidak k
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Tabel 2. Sifat Fisik dan Kimia Katekin Sifat Fisik Kenampakan : putih Titik beku : 104-106 oC Titik didih : 245 oC Tekanan uap : 1 mmHg pada
Sifat Kimia Sensitif terhadap oksigen Sensitif terhadap cahaya Berfungsi sebagai antioksidan Substansi yang dihindari : unsur
75oC Densitas uap : 3.8 g/m 3
oksi oksida dasi si,, asam asam klor klorid ida, a, asam asam
Flash point : 137 C Explosion limits (batas atas) :
anhidrida, basa, dan asam nitrit Larut dalam air hangat Stabil dalam konsisi agak asam
1.97%
atau netral (pH optimum 4-8)
o
(Anonim, 2001)
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B. Sub Substa stansi nsi Bukan Bukan Fenol Fenol a.
Karbohidrat
Daun teh juga memiliki karbohidrat, karbohidrat, dari gula yang sederhana sederhana hingga hingga yang yang komple kompleks, ks, di antara antaranya nya yaitu yaitu sukros sukrosa, a, glukos glukosa, a, dan fruktosa. Keseluruhan karbohidrat yang dikandung teh adalah 0.75% dari berat kering daun. ( Syah, Syah, 2006) b.
Substansi Pe Pektin
Substansi pektin terutama terdiri atas pektin dan asam pektat.
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e.
Prot rotein dan dan Asamam-asam sam Amino mino
Prot Protei ein n pada pada daun daun teh teh memi memili liki ki pera perana nan n pent pentin ing g dala dalam m pem pembe bent ntuk ukan an arom aromaa pada pada teh. teh. Prot Protei ein n ini ini akan akan meng mengal alam amii pembongkaran menjadi asam-asam amino. Reaksi Reaksi asam asam amino amino dengan dengan kateki katekin n pada pada temper temperatur atur tinggi tinggi menghasilkan aldehid yang bertanggungjawab atas aroma teh. Dalam daun teh juga muncul asam amino yang biasanya dikenal sebagai theanin, yang berhubungan dengan kualitas minuman teh.
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Daun teh mengandung beberapa vitamin, yaitu vitamin C, K, A, B1, dan B2. Selama proses pengolahan teh, vitamin C mengalami oksidasi sehingga kandungannya dalam teh akan hilang. Demikian pula dengan vitamin E.
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D. En Enzi zimm-En Enzi zim m
Beberapa enzim terdapat dalam daun teh. Peranan penting dari enzim-e enzim-enzi nzim m ini adalah adalah sebaga sebagaii biokat biokatali alisato satorr pada pada setiap setiap reaksi reaksi kimia di dalam tanaman. Enzim yang dikandung dalam daun teh di
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epig epigal alok okate ateki kin n gala galatt (EGC (EGCG) G) yang yang diun diungg ggul ulka kan n seba sebaga gaii seny senyaw awaa pencegah kanker. Berdasarkan Berdasarkan penelitian, teh hijau dengan kandungan kandungan katekinnya katekinnya dapat menekan pembentukan tumor yang diinduksi oleh 7,12-dimetil-
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dengan dengan kadar garam berlebihan, berlebihan, kurangnya kurangnya asupan asupan serat, merokok, merokok, dan sejarah penyakit dalam keluarga. Teh yang baik untuk diminum guna mencegah kanker perut adalah teh hijau. Hasil riset terbaru menunjukkan bahwa satu gelas teh hijau
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