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ROESTAMSJAH ROESTAMSJAH
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Materials Science & Nanotechnology

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PENGARUH PENGGUNAAN GARAM NATRIUM DAN KALIUM METABISULFIT PADA MUTU SALE PISANG AMBON ANNY SULASWATTY; ROESTAMSJAH ROESTAMSJAH
Jurnal Kimia Terapan Indonesia Vol 1, No 2 (1991)
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (6458.966 KB) | DOI: 10.14203/jkti.v1i2.303

Abstract

Techniques of improving the colour, aroma, texture and storage life of pisang sale or dried banana (Musa paradisiacal was conducted through sulphiting and drying. In this study, the sulphiting of ball all a fruit was done by soaking the fruit in O.S% sodium meta bisulfite solution (NazSzOs) or O.S% potasium metabisulfite solution (K2S2O5) for five minutes. Dehydration was conducted at 6O°C for 44 hours in a tray dryer. The dried banana was put in plastic bag of O.5 mm film thickness and stored in a rack covered with transparent plastic film at ambient temperature (25° ± 2°C) and relative humidity of ±70%. The experiment was done using random block design. Analysis of the dried banana products included chemical, microbiological an d organoleptic methods after storage for one day, three weeks, six weeks and 12 weeks. The results indicated that the artificial drying coupled with the metablsulphite treatment could improve the quality and shelf life of the dried banan a produced. The product quality characteristics include: water content (23-27%), total reducing sugar (41-49%), SO2 (3-S fpm), color/optical density (0,3-0,7); and total colony count (7-7.5 x 10(3)) per gram sample for the products stored up to 12 weeks.
KARAKTERISASI POLIMER BAHAN ADESIF UNTUK KULIT DAN PLASTIK Roestamsjah Roestamsjah; Nuri Astrini
Jurnal Kimia Terapan Indonesia Vol 3, No 2 (1993)
Publisher : Research Center for Chemistry - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3334.623 KB) | DOI: 10.14203/jkti.v3i2.276

Abstract

Characterization of polymer of five commercially available elastomeric adhesives claimed 'suitable for leather and plastics had been conducted. Polymer samples were isolated from adhesive solutions by precipitation, and then characterized through FTIR spectroscopy, viscometry, GPC and thermal analysis. The FTIR spectrogram, indicate that five different samples of adhesives contained polychloroprene. Thermal analysis indicated similar glass transition points (Tg) of -40 to -43°C and three of them indicated the second glass transitions at 1.4; 3.6 and 13.5°C, Five adhesives indicated melting points (Tm) of polymers at 43 - 48°C, The average viscosity molecular weight (Mv) indicated two groups; i.e. Mv: 115,000 - 146,000 and Mv : 357,000 - 425,000. From secondary sources, polychloroprene has solubility parameter 8= 8.2 - 9.4 (cal em -3)0.5 or 16.74 - 19.13 (kJ m-3)0.5 and critical surface tension Yc = 38 dyne cmr-1 or mN m-1.
Co-Authors ANNY SULASWATTY Nuri Astrini