Ridwan Thahir
Indonesian Center for Agricultural Postharvest Research and Development

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THE EMPIRICAL RELATIONSHIP BETWEEN PRICE AND QUALITY OF RICE AT MARKET LEVEL IN WEST JAVA Rachmat, Ridwan; Thahir, Ridwan; Gummert, Martin
Indonesian Journal of Agricultural Science Vol 7, No 1 (2006): April 2006
Publisher : Indonesian Agency for Agricultural Research and Development - MOA

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Abstract

Rice consumers in Indonesia exhibit wide preference variability and consumption patterns, largely because of the archipelagic nature of the country. Nowadays, the consumers become more discriminating on the rice quality due to the higher incomes and better life. Consumers are willing to pay higher price for specific quality. The objective of the study was to analyze relationship between price and grades of rice and consumer preference. The study was based on survey conducted from April 2004 to March 2005 at three-rice market centers representing a village market(Pasar Inpres) in Subang, district capital market (Pasar Johar) in Karawang, and rice center market (Pasar Induk Cipinang) in Jakarta, respectively. Parameters evaluated were changes in the quality and price of rice over time. The quality of the rice at each market was sampled monthly from two traders consisting three samples each. The rice quality was graded using existing local standar, i.e. grade 1, grade 2, and grade 3, and the price of each grade was recorded. The physical qualities of the rice samples such as moisture content, grain dimensions, percentage of whole kernels, grain color, and impurities/dockage (foreign matters, unhulled grains, and milled rice) were determined by ISO 950:1979 (for cereals-sampling as grain). Whereas the chemical qualities such as amylose and gelatinization were analyzed using Rapid Visco Analisis. The study showed that rice quality varied, most of them were long and slender kernels, chalkiness ranged between 10-20% (scale 5), and head ricearound 69-84%. The amylose content was intermediate (20-21%), the gelatinization temperature was high-intermediate (70-74oC), and the gel consistency was soft (65-70). The quality incentive, defined as the  additional return assuming the quality level can be raised from grade 3 to grade 1, was up to Rp700 kg-1 (~25%). The price difference among markets could reach Rp630 kg-1 (~22%). The study indicated that rice color was the important parameter determining consumers’ preference,and consequently ditermining price difference. The correlation between the rice price and its grade was significant (R= 0.95).
Diet Berbasis Sorgum (Sorghum bicolor L Moench) Memperbaiki Proliferasi Limfosit Limfa dan Kapasitas Antioksidan Hati Tikus Zakaria, Fransiska R.; Prangdimurti, Endang; Puspawati, G. A. Kadek Diah; Thahir, Ridwan; Suismono, Suismono
JURNAL PANGAN Vol 20, No 3 (2011): PANGAN
Publisher : Perum BULOG

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1933.278 KB) | DOI: 10.33964/jp.v20i3.155

Abstract

Sorgum merupakan tanaman serealia yang sangat berguna sebagai sumber karbohidrat alternatif dalam program diversifikasi pangan. Sorgum memiliki kandungan protein yang lebih tinggi dibandingkan beras dan berprospek baik untuk dikembangkan di Indonesia. Banyak penelitian telah menunjukkan bahwa sorgum sangat baik untuk kesehatan, antara lain untuk mengurangi resiko penyakit degeneratif. Penelitian secara in vitro sebelumnya, menunjukkan bahwa serealia ini mampu meningkatkan proliferasi limfosit manusia, yang menunjukkan perbaikan sistem imun. Tujuan penelitian ini adalah untuk mempelajari efek sorgum terhadap sistem imun dan kapasitas antioksidan secara in vivo pada tikus. Tiga kelompok tikus diberi pakan kontrol, pakan mengandung 50 persen atau 100 persen sorgum sebagai sumber karbohidrat selama 7 minggu. Hasil penelitian menunjukkan bahwa kelompok tikus yang diberi pakan mengandung 50 persen atau 100 persen sorgum mengalami peningkatan aktivitas proliferasi mencapai berturut-turut 70 persen dan 63 persen, aktivitas antioksidan hati (DPPH) mencapai 38 persen dan 29 persen, aktivitas enzim superoksida dismutase (SOD) mencapai 98 persen dan 91 persen, aktivitas enzim katalase (CAT) mencapai 28 persen dan 21 persen, dan aktivitas glutation peroksida (GPx) mencapai 57 persen dan 33 persen, akan tetapi mengalami penurunan kandungan malondialdehid (MDA) hingga 22 persen dan 16 persen. Penelitian ini menunjukkan bahwa sorgum mempunyai aktifitas imunostimulani dan aktivitas perbaikan antioksidan sehingga baik bagi kesehatan.Sorghum is a cereal that would be useful as alternative carbohydrate source in food diversification program. It has higher protein content than rice and good prospect to be developed in Indonesia. Researches have shown that sorghum has functions in health, such as to decrease degenerative disease risk. Previous in vitro study of sorghum showed that this cereal could increase human lymphocyte cell proliferation in vitro, indicating immune system improvement. The objectives of this research were to study the effects of sorghum on the in vivo immune system and liver antioxidant capacity in rats. Three groups of rats were fed control diet, diet containing 50 percent or 100 percent sorghum as sources of carbohydrate. The results showed that the rats fed with 50 percent or 100 percent sorghum displayed increase in, respectively, proliferation activity by 70 percent and 63 percent; liver antioxidant activity (DPPH) by 38 percent and 29 percent, super dioxide dismutase enzyme activity (SOD) by 98 percent and 91, catalyst enzyme activity (CAT) by 28 percent and 21 percent, and glutathione peroxides enzyme activity (GPx) by 57 percent and 33 percent; but decreased in malondialdehyde (MDA) by 22 percent and 16 percent. This research showed that sorghum has immunostimulation and antioxidant improvement activities and will be very good as source of carbohydrate diet.