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Yacob Ando
Pusat Penelitian dan Pengembangan Hasil Hutan
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PERCOBAAN PEMBUATAN DEKSTRIN DARI TEPUNG SAGU (Metroxylon spp.) Yacob Ando; Toga Silitonga
Jurnal Penelitian Hasil Hutan Vol 5, No 2 (1988): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4126.56 KB) | DOI: 10.20886/jphh.1988.5.2.42-46

Abstract

The experimental study of dextryn manufacture was conducted at the Forest Products Research and Development Centre laboratory in Bogor. The sago flour was obtained from Riau, originally extracted from female sago as signified by the absence of spine on the leaves.                     The sago starch was manufactured into dextryin at 80oC starting reaction temperature. Prior to the reaction sufficient amount of sago starch was bleached with 1% CaOCl2. The starch was allowed to settle down and dried. Umbleached sago starch was prepared as control. During the dextryn manufacture the HCl was gradually sprayed to the starch while elevating the temperature to 120oC, at which it was maintained for 2 hours.            The reaction products were then tested and the properties compared with that of the existing standard. The quality of the dextryn manufactured was evaluated and discussed. The result of the experiment was slighty inverior compared with that of the superior and prima quality due to the low dextryn content.
SIFAT-SIFAT KOPAL MANILA DARI PEKALONGAN TIMUR DAN BANYUMAS BARAT Yacob Ando; Bambang Wiyono
Jurnal Penelitian Hasil Hutan Vol 5, No 6 (1988): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3305.07 KB) | DOI: 10.20886/jphh.1988.5.6.353-356

Abstract

Manila  copal  is a  natural  rosin obtained by  tapping Agathis  trees. The  resin is generally  collected  every  other  two weeks.  In trade copal is known  of three kinds  namely: Caurry,  Congo, and Manila Copal. Indonesian  copal includes manila copal;  is divided   into  four  groups,   among  others: bua,  loba,  melengket, and  pontianak  copal.The  moisture  content   of  manila  copal from  East Pekalongan and West Banyumas  was 1.74%  and 1.85%; the colour, based on  the LPHH  standard  ranked  3 and  2;  impurities  2.47%  and 2.49%; softening  point  81°C and 92°C.;  ash content 0.04% and  0.08%; acid  number  118.93 and  139.71; saponification number 337.67  and 392.98;  and iod number  36.5  and 42.98,   repectively.Manila  copal from  East  Pekalongan  and  West Banyumas appeared  to have good  quality and  belongs  to  the first qualify   based  on  the  Indonesian Standard.  Manila copal  from  West Banyumas  has a  higher  resin acid content   then  that from East  Pekalongan.
DIMENSI SERAT DAN KOMPOSISI KIMIA KAYU ALPOKAT Yacob Ando
Jurnal Penelitian Hasil Hutan Vol 5, No 2 (1988): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.1988.5.2.77-79

Abstract

The  fiber  dimension   and  chemical composition of  Persea sp. are presented  in this report.  The analyses include determination   of the  fiber  dimension (length, diameter cell  wall thickness, and Runkel ratio), and chemical composition. (cellulose, lignin, pentosan, ash,   extractives, and solubility in one percent  sodium hydroxide  solution).The study  reveals that the average  fiber length is 1105.36 µ, diameter 19. 09 µ,  cell wall thickness  2,36 µ and Runkel ratio  0.37.  The  cellulose  content amounts to 45.46  percent,  lignin 23.71 per cent,  pentosan  19.67 percent and ash 1.27 percent.The  solubility  in cold  water ; was found to be  5.43  percent;  in hot  water  5.55  percent, in alcohol  benzene 1:2 ratio,  4.02  percent  and in one  per cent sodiumhydroxide  solution 11.36 percent.Based on the  fiber dimension and the chemical composition, it was found that Persea wood  is suitable for producing good  quality  paper.
PERCOBAAN PEMBUATAN DEKSTRIN DARI TEPUNG SAGU (Metroxylon spp.) Yacob Ando; Toga Silitonga
Jurnal Penelitian Hasil Hutan Vol 5, No 2 (1988): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.1988.5.2.42-46

Abstract

The experimental study of dextryn manufacture was conducted at the Forest Products Research and Development Centre laboratory in Bogor. The sago flour was obtained from Riau, originally extracted from female sago as signified by the absence of spine on the leaves.                     The sago starch was manufactured into dextryin at 80oC starting reaction temperature. Prior to the reaction sufficient amount of sago starch was bleached with 1% CaOCl2. The starch was allowed to settle down and dried. Umbleached sago starch was prepared as control. During the dextryn manufacture the HCl was gradually sprayed to the starch while elevating the temperature to 120oC, at which it was maintained for 2 hours.            The reaction products were then tested and the properties compared with that of the existing standard. The quality of the dextryn manufactured was evaluated and discussed. The result of the experiment was slighty inverior compared with that of the superior and prima quality due to the low dextryn content.
SIFAT-SIFAT KOPAL MANILA DARI PEKALONGAN TIMUR DAN BANYUMAS BARAT Yacob Ando; Bambang Wiyono
Jurnal Penelitian Hasil Hutan Vol 5, No 6 (1988): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.1988.5.6.353-356

Abstract

Manila  copal  is a  natural  rosin obtained by  tapping Agathis  trees. The  resin is generally  collected  every  other  two weeks.  In trade copal is known  of three kinds  namely: Caurry,  Congo, and Manila Copal. Indonesian  copal includes manila copal;  is divided   into  four  groups,   among  others: bua,  loba,  melengket, and  pontianak  copal.The  moisture  content   of  manila  copal from  East Pekalongan and West Banyumas  was 1.74%  and 1.85%; the colour, based on  the LPHH  standard  ranked  3 and  2;  impurities  2.47%  and 2.49%; softening  point  81°C and 92°C.;  ash content 0.04% and  0.08%; acid  number  118.93 and  139.71; saponification number 337.67  and 392.98;  and iod number  36.5  and 42.98,   repectively.Manila  copal from  East  Pekalongan  and  West Banyumas appeared  to have good  quality and  belongs  to  the first qualify   based  on  the  Indonesian Standard.  Manila copal  from  West Banyumas  has a  higher  resin acid content   then  that from East  Pekalongan.
DIMENSI SERAT DAN KOMPOSISI KIMIA KAYU ALPOKAT Yacob Ando
Jurnal Penelitian Hasil Hutan Vol 5, No 2 (1988): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.1988.5.2.77-79

Abstract

The  fiber  dimension   and  chemical composition of  Persea sp. are presented  in this report.  The analyses include determination   of the  fiber  dimension (length, diameter cell  wall thickness, and Runkel ratio), and chemical composition. (cellulose, lignin, pentosan, ash,   extractives, and solubility in one percent  sodium hydroxide  solution).The study  reveals that the average  fiber length is 1105.36 µ, diameter 19. 09 µ,  cell wall thickness  2,36 µ and Runkel ratio  0.37.  The  cellulose  content amounts to 45.46  percent,  lignin 23.71 per cent,  pentosan  19.67 percent and ash 1.27 percent.The  solubility  in cold  water ; was found to be  5.43  percent;  in hot  water  5.55  percent, in alcohol  benzene 1:2 ratio,  4.02  percent  and in one  per cent sodiumhydroxide  solution 11.36 percent.Based on the  fiber dimension and the chemical composition, it was found that Persea wood  is suitable for producing good  quality  paper.
Co-Authors Bambang Wiyono Toga Silitonga